Sterilization physiotherapy insole and preparation method thereof

Abstract

The invention relates to the technical field of insole preparation, in particular to a sterilization physiotherapy insole and a preparation method thereof. The preparation method comprises the following steps: preparing an upper composite insole layer; preparing a power supply control pad; preparing a lower supporting layer; the upper composite insole layer, the power control layer and the lower supporting layer are sequentially subjected to hot-pressing composition, and the sterilization physiotherapy insole is obtained. And the preparation raw materials of the upper composite insole layer comprise titanium dioxide and a micro ultraviolet LED. In the application, the upper composite insole layer, the power supply control pad and the lower supporting layer are prepared step by step, and then the functional layers are integrated through hot-pressing compounding, titanium dioxide in the upper composite insole layer is matched with a micro ultraviolet LED to play a role in bacteriostasis, and in combination with the synergistic effect of the subsequent functional layers, the functions of sterilization and physical therapy can be integrated; moreover, an irritant antibacterial agent is not needed, the use safety and the health care effect are both considered, and the comprehensive requirements of daily wearing on foot bacterium inhibition and acupuncture point care are met.

Description

Technical Field

[0001] This application relates to the field of insole preparation technology, and mainly to a sterile therapeutic insole and its preparation method. Background Technology

[0002] As the foundation for human movement and support, the health of the feet directly affects people's quality of life. The inside of everyday shoes is a relatively enclosed microenvironment, which easily breeds various bacteria and fungi. These microorganisms not only produce unpleasant odors but can also cause various foot diseases such as athlete's foot and onychomycosis, causing discomfort and posing health risks.

[0003] Most ordinary insoles on the market today only offer basic cushioning and sweat-absorbing functions, failing to effectively address foot health issues. Some insoles with massage functions lack scientific and targeted design for their massage protrusions, failing to accurately stimulate foot reflex zones and thus hindering the achievement of ideal therapeutic effects. Furthermore, most ordinary shoes on the market do not adequately consider antibacterial functions. Some "antibacterial shoes" rely on adding antibacterial agents to the upper or insole materials. However, this method has several limitations: firstly, the effectiveness of antibacterial agents gradually weakens over time and with increased washing, failing to maintain a good antibacterial effect in the long term; secondly, some antibacterial agents may irritate the skin, posing certain safety risks.

[0004] To meet the growing demand for foot health, it is necessary to provide a therapeutic insole that can precisely stimulate foot reflex zones, possesses excellent material properties, and thus effectively promote foot health. Therefore, existing technologies still need improvement and development. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a sterile therapeutic insole and its preparation method, which aims to solve the problem that existing antibacterial shoes using antibacterial agents are prone to irritation and have weakened efficacy.

[0006] The technical solution of this application is as follows: In a first aspect, this application provides a method for preparing a sterile therapeutic insole, comprising the following steps: Preparation of the upper composite insole layer; Fabrication of power control pad; Prepare the lower support layer; The upper composite insole layer, the power control layer, and the lower support layer are sequentially hot-pressed together to obtain the sterile therapeutic insole; The raw materials for preparing the upper composite insole layer include titanium dioxide and micro ultraviolet LEDs.

[0007] Furthermore, the step of preparing the upper composite insole layer includes: A flexible insole substrate is selected, and an arch support part that bulges upward in the middle is formed in the arch area using a mold. Titanium dioxide nanoparticles and an aqueous adhesive are mixed to form a titanium dioxide coating slurry, which is then coated onto the forefoot and heel areas of the flexible insole substrate. Heating and drying form a titanium dioxide surface layer; Miniature ultraviolet LEDs are embedded on the surface layer of the titanium dioxide according to acupoints; The micro UV LED has a wavelength of 100-280nm, an operating voltage of 2.5-4.0V, and a light emission angle of 120°.

[0008] Furthermore, the mass ratio of the titanium dioxide nanoparticles to the aqueous adhesive is 1:5-8; The coating thickness is 0.3-0.8 mm; The heating and drying temperature is 60-80℃, and the time is 1-2 hours.

[0009] Furthermore, the preparation method of the titanium dioxide nanoparticles includes the following steps: Mix tetrabutyl titanate with anhydrous ethanol and stir at 300-500 r / min for 30-40 min. The reaction is carried out at 110-130℃ for 4-5 hours. Wash three times with ethanol and once with deionized water. After each wash, centrifuge at 3700 rpm for 5 min. Dry at 80-90℃ for 24-30 hours, then calcine at 600-1000℃ for 6-8 hours; The volume ratio of tetrabutyl titanate to anhydrous ethanol is 1:28-30.

[0010] Furthermore, the step of preparing the lower support layer includes: The insole substrate is made of flexible material and molded into a honeycomb structure. Prepare cellulose aerogel and fill the cellulose aerogel into the cavity of the honeycomb-like structure; The honeycomb-like structure has a side length of 2-5 mm and a wall thickness of 0.3-0.5 mm.

[0011] Furthermore, the step of preparing cellulose aerogel includes: Natural bamboo fiber is dispersed in a solvent and stirred vigorously to obtain a cellulose solution; The cellulose solution is added dropwise to the regeneration solution and solidified. Rinse with deionized water for 12-15 hours, and exchange with ethanol more than 3 times to obtain the precursor; The precursor was freeze-dried for 36-48 hours.

[0012] Furthermore, the solvent is prepared by mixing sodium hydroxide, urea, and water in a mass ratio of 7:12:81; The mass ratio of the natural bamboo fiber to the solvent is 1:45-55, and the temperature of the vigorous stirring is -12℃. The regeneration solution is prepared by mixing citric acid and acetic acid in a mass ratio of 1:3-5, and the mass ratio of the cellulose solution to the regeneration solution is 1:5-8.

[0013] Furthermore, the step of preparing the power control pad includes: An insulating flexible substrate is selected, and a control component, a Bluetooth component, and a power component are mounted on the substrate. Microcontroller components and signal input interface components are soldered onto the control assembly; A complete circuit is formed by connecting the control component, the miniature ultraviolet LED, the Bluetooth component, and the power supply component with wires.

[0014] Furthermore, the hot-pressing composite step includes: A 0.1-0.2 mm hot melt adhesive film is coated between the upper composite insole layer and the power control layer, and between the power control layer and the lower support layer, and then hot-pressed together for 5-10 minutes at 80-100℃ and 0.3-0.5 MPa pressure. The power control layer is installed in a position corresponding to the arch support.

[0015] Secondly, this application provides a sterile therapeutic insole, which is prepared by the method for preparing a sterile therapeutic insole as described in the first aspect.

[0016] Beneficial effects: In this application, the upper composite insole layer, power control pad, and lower support layer are prepared in steps, and then the functional layers are integrated by hot pressing. The titanium dioxide in the upper composite insole layer, together with the micro ultraviolet LED, can play an antibacterial role. Combined with the synergistic effect of the subsequent functional layers, the functions of sterilization and physiotherapy can be integrated, without relying on irritating antibacterial agents. It takes into account both safety and health care effects, and meets the comprehensive needs of daily wear for inhibiting foot bacteria and maintaining acupoints. Detailed Implementation

[0017] This application provides a sterilized therapeutic insole and its preparation method. To make the purpose, technical solution, and effects of this application clearer and more explicit, the following provides a more detailed description. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] This application provides a method for preparing a sterile therapeutic insole, comprising the following steps: S1. Preparation of the upper composite insole layer; S2. Prepare the power control pad; S3. Prepare the lower support layer; S4. The upper composite insole layer, the power control layer and the lower support layer are sequentially hot-pressed together to obtain the sterilized physiotherapy insole; The raw materials for preparing the upper composite insole layer include titanium dioxide and micro ultraviolet LEDs (TiO2).

[0019] In this application, the upper composite insole layer, power control pad, and lower support layer are prepared in steps, and then the functional layers are integrated by hot pressing. The titanium dioxide in the upper composite insole layer, together with the micro ultraviolet LED, can play an antibacterial role. Combined with the synergistic effect of the subsequent functional layers, the functions of sterilization and physiotherapy can be integrated without relying on irritating antibacterial agents. It takes into account both safety and health care effects, and meets the comprehensive needs of daily wear for inhibiting foot bacteria and maintaining acupoints.

[0020] Further, in step S1, the step of preparing the upper composite insole layer includes: S11. Select a flexible insole substrate and mold an arch support part that bulges upward in the middle of its arch area. S12. Titanium dioxide nanoparticles and water-based adhesive are mixed to form a titanium dioxide coating slurry, which is then coated on the forefoot and heel areas of the flexible insole substrate. S13. Heat and dry to form a titanium dioxide surface layer; S14. Embed the miniature ultraviolet LEDs onto the surface layer of the titanium dioxide according to the acupoints.

[0021] Specifically, the flexible insole substrate can be a polydimethylsiloxane (PDMS) film; the water-based adhesive can be a water-based polyurethane adhesive to ensure flexibility.

[0022] In this application, the molded arch support precisely adapts to the physiological curve of the foot, providing stable support for the arch, relieving foot fatigue from prolonged walking, and physically protecting the underlying power control components from damage caused by foot pressure. By applying a titanium dioxide coating to the forefoot and heel areas (core areas prone to sweating and bacterial growth), the antibacterial effect in key areas can be specifically enhanced. The subsequently embedded acupoints correspond to micro-ultraviolet LEDs, which can directly kill bacteria, stimulate the photocatalytic sterilization properties of titanium dioxide, and stimulate acupoints through physical protrusions created by the embedding, thus achieving sterilization while providing therapeutic effects and enhancing the targeted intervention of the insole for foot health.

[0023] Further, in step S12, the mass ratio of the titanium dioxide nanoparticles to the aqueous adhesive is 1:5-8; The coating thickness is 0.3-0.8 mm; The heating and drying temperature is 60-80℃, and the time is 1-2 hours.

[0024] In this application, by controlling the mass ratio of titanium dioxide nanoparticles to water-based adhesive, it is possible to ensure good adhesion between the coating and the flexible substrate while ensuring uniform dispersion of titanium dioxide, thus preventing the coating from peeling off during daily wear. By coating to an appropriate thickness, sufficient antibacterial components can be accommodated to ensure sterilization effect, while the coating thickness will not affect the flexibility and wearing comfort of the insole. By controlling the drying conditions, the coating can be cured quickly while avoiding high temperature damage to the crystal structure and photocatalytic activity of titanium dioxide, ensuring long-term stability of antibacterial performance.

[0025] Further, in step S12, the preparation method of the titanium dioxide nanoparticles includes the following steps: S121. Mix tetrabutyl titanate with anhydrous ethanol and stir at 300-500 r / min for 30-40 min. S122, react at 110-130℃ for 4-5 hours; S123. Wash 3 times with ethanol and 1 time with deionized water. After each wash, centrifuge at 3700 rpm for 5 min. S124 is dried at 80-90℃ for 24-30 hours, and then calcined at 600-1000℃ for 6-8 hours. In this application, stirring ensures uniform mixing of tetrabutyl titanate and anhydrous ethanol, preventing excessively rapid local hydrolysis that could lead to particle agglomeration. Heating and maintaining the reaction temperature promotes the full reaction of the precursor to form titanium dioxide with uniform particle size. Multiple rounds of washing with ethanol and deionized water, combined with centrifugation, effectively remove unreacted impurities. Subsequent drying and calcination enhance the crystallinity of titanium dioxide, improve its photocatalytic efficiency, and ensure the antibacterial rate against harmful bacteria, thus guaranteeing the core antibacterial function of the insole.

[0026] Further, in step S121, the volume ratio of the tetrabutyl titanate to the anhydrous ethanol is 1:28-30.

[0027] In this application, by controlling the volume ratio of tetrabutyl titanate to anhydrous ethanol, the concentration of tetrabutyl titanate can be precisely controlled, avoiding excessively high concentration leading to excessively fast hydrolysis rate and uneven particle size of the generated nanoparticles, or excessively low concentration leading to low reaction efficiency and waste of raw materials. This ensures that the final prepared titanium dioxide nanoparticles have a relatively uniform particle size, which is beneficial to improving the stability of photocatalytic activity.

[0028] Furthermore, in step S14, the wavelength of the miniature ultraviolet LED is 100-280nm, the operating voltage is 2.5-4.0V, and the emission angle is 120°.

[0029] In this application, the wavelength of 100-280nm belongs to the deep ultraviolet band, which has a strong direct sterilization capability. At the same time, it can efficiently excite titanium dioxide to generate hydroxyl radicals and superoxide anions, thereby enhancing the photocatalytic sterilization effect. The 120° emission angle can expand the ultraviolet light coverage range, ensure that the surface layer of titanium dioxide is uniformly excited, avoid antibacterial dead zones, and improve the overall sterilization efficiency.

[0030] Further, in step S2, the step of preparing the power control pad includes: S21. Select an insulating flexible substrate and install a control component, a Bluetooth component, and a power component on the substrate. S22. Weld microcontroller components and signal input interface components onto the control assembly; S23. Connect the control component, the miniature ultraviolet LED, the Bluetooth component, and the power supply component with wires to form a complete circuit.

[0031] The insulating flexible substrate can be a porous, breathable polyimide (PI) film.

[0032] In this application, an insulating flexible substrate is selected to adapt to the bending characteristics of the insole, avoiding the impact of a rigid substrate on wearing comfort. The integrated design of the control component, Bluetooth component, and power component, together with microcontroller components and signal input interface components, enables the timed switching and working duration adjustment of the miniature ultraviolet LED. The Bluetooth component also supports connection with mobile terminals, facilitating remote control and mode switching for users. The complete circuit connection ensures that all functional modules work together, guaranteeing stable output of sterilization and physiotherapy functions without the need for frequent manual operation, thus improving ease of use.

[0033] Further, in step S3, the step of preparing the lower support layer includes: S31. Flexible insole substrate is used, and a honeycomb structure is formed by molding. S32. Prepare cellulose aerogel and fill the cellulose aerogel into the cavity of the honeycomb-like structure.

[0034] In this application, the honeycomb-like structure is molded, which can achieve good cushioning and shock absorption while ensuring support, and can be combined with a flexible substrate to adapt to changes in foot pressure in scenarios such as walking and running, thereby reducing foot impact damage. The cellulose aerogel filled in the cavity can significantly improve the breathability and moisture wicking capacity of the insole due to its high porosity, accelerate the removal of moisture inside the shoe, reduce the damp environment for bacterial growth, and form a synergy with the antibacterial function of the upper composite insole layer to further improve the microenvironment inside the shoe.

[0035] Furthermore, in step S32, the side length of the space in the honeycomb-like structure is 2-5mm, and the wall thickness is 0.3-0.5mm.

[0036] In this application, a side length of 2-5mm can balance cushioning performance and structural stability, avoiding insufficient support due to excessive side length or breathability due to insufficient side length; a wall thickness of 0.3-0.5mm can ensure structural strength to withstand foot pressure, reduce material usage, reduce the overall weight of the insole, improve the feeling of lightness when wearing, and take into account both functionality and comfort.

[0037] Further, in step S32, the step of preparing cellulose aerogel includes: S321. Disperse natural bamboo fiber in a solvent and stir vigorously to obtain a cellulose solution; S322. The cellulose solution is added dropwise to the regeneration solution and solidified. S323, rinse with deionized water for 12-15 hours, and exchange with ethanol more than 3 times to obtain the precursor; S324. Freeze-dry the precursor for 36-48 hours.

[0038] In this application, natural bamboo fiber is used as the raw material, which is environmentally friendly and biocompatible, avoiding the skin irritation risks that synthetic materials may cause. Washing removes residual solvents and impurities. Freeze-drying maximizes the preservation of the aerogel's porous structure, preventing pore collapse caused by heat drying, ensuring its breathability and moisture absorption, which helps guarantee the insole's wearing comfort and aids in achieving antibacterial effects.

[0039] Further, in step S321, the solvent is prepared by mixing sodium hydroxide, urea and water in a mass ratio of 7:12:81.

[0040] In this application, by preparing the solvent in an appropriate ratio, natural bamboo fiber can be efficiently dissolved at low temperature, the hydrogen bonds between fiber molecules are broken, and a uniform cellulose solution is formed.

[0041] Further, in step S321, the mass ratio of the natural bamboo fiber to the solvent is 1:45-55, and the temperature of the vigorous stirring is -12℃.

[0042] In this application, by controlling the mass ratio of natural bamboo fiber to solvent, it is possible to ensure that the bamboo fiber is fully dissolved and the solution concentration is appropriate, avoiding insufficient dissolution and uneven solution caused by excessive fiber. Vigorous stirring at low temperature ensures the dissolution of the fiber while inhibiting fiber degradation, thus ensuring the stability of the cellulose solution and the subsequent molding quality.

[0043] Further, in step S322, the regeneration solution is prepared by mixing citric acid and acetic acid in a mass ratio of 1:3-5, and the mass ratio of the cellulose solution to the regeneration solution is 1:5-8.

[0044] In this application, the cross-linking effect of citric acid and the pH adjustment of acetic acid are used to achieve mild curing of cellulose, avoiding the material embrittlement caused by excessive citric acid content or insufficient curing caused by excessive acetic acid content. By controlling the mass ratio of cellulose solution to regeneration solution, it can be ensured that the cellulose solution is fully dispersed in the regeneration solution, achieving uniform curing and forming an aerogel with complete structure and good toughness, which helps to adapt to the bending and compression scenarios of long-term wear of insoles.

[0045] Further, in step S4, the hot-pressing composite step includes: S41. A 0.1-0.2 mm hot melt adhesive film is coated between the upper composite insole layer and the power control layer, and between the power control layer and the lower support layer. S42. Hot-press bonding at 80-100℃ and 0.3-0.5MPa pressure for 5-10 minutes; In this application, a suitable hot melt adhesive film thickness can ensure interlayer adhesion while avoiding excessive film thickness that could affect the insole's flexibility. By heating and pressurizing, the adhesive film can be fully melted without damaging the structure and performance of each functional layer, ensuring a tight bond between layers, preventing delamination and peeling during use, and improving the overall structural stability and service life of the insole.

[0046] Furthermore, in step S41, the installation position of the power control layer corresponds to that of the foot arch support.

[0047] In this application, the power control layer is installed correspondingly to the arch support part. It can rely on the raised structure of the arch support part to form physical protection, avoid the pressure of the sole of the foot from acting directly on the power control component when walking or standing, reduce the risk of component compression damage, and extend the service life of the power control pad.

[0048] This application also provides a sterile therapeutic insole, which is prepared by the method described above. The resulting sterile therapeutic insole integrates the functions of synergistic sterilization by titanium dioxide and ultraviolet LEDs, acupoint therapy, cushioning and shock absorption, and breathability and moisture wicking, achieving sterilization and therapeutic effects while ensuring wearing comfort.

[0049] The following specific examples provide further details.

[0050] Example 1 The preparation method of the sterile therapeutic insole in Example 1 includes the following steps: (1) Preparation of the upper composite insole layer.

[0051] (11) Select a 1mm thick polydimethylsiloxane (PDMS) film as the substrate for flexible insoles, and form an arch support part with an upward protrusion (0.8cm in height) in the middle of the arch area using a custom mold; (12) Preparation of titanium dioxide nanoparticles: 1 mL of tetrabutyl titanate and 29 mL of anhydrous ethanol were mixed at a volume ratio of 1:29 and stirred at 400 r / min for 35 min; the mixture was transferred to a reaction vessel and kept at 120℃ for 4.5 h; the mixture was washed 3 times with ethanol and 1 time with deionized water, and centrifuged at 3700 rpm for 5 min after each wash; the mixture was dried at 85℃ for 27 h and then calcined at 800℃ for 7 h to obtain titanium dioxide nanoparticles; the titanium dioxide nanoparticles were mixed with waterborne polyurethane adhesive (from Shanghai Hecheng Polymer) at a mass ratio of 1:6 and stirred for 20 min to prepare a coating slurry, which was then coated on the forefoot and heel areas with a coating thickness of 0.5 mm using a scraper; (13) Place the coated substrate in a 70°C oven and dry for 1.5 hours to form a titanium dioxide surface layer; S14 uses miniature ultraviolet LEDs with a wavelength of 200nm, an operating voltage of 3.2V, and a light emission angle of 120°. These LEDs are embedded on the surface layer of titanium dioxide at eight acupoints, including Yongquan and Taichong points on the sole of the foot, with a protrusion height of 0.3mm.

[0052] (2) Prepare the power control pad.

[0053] (21) Select a porous, breathable polyimide film with a thickness of 0.1 mm and an air permeability of 350 mm / s as an insulating flexible substrate, and install control components, Bluetooth components and power components (3.7V 100mAh lithium battery) on the substrate. (22) Solder the microcontroller components and signal input interface components onto the control assembly; (23) Use tinned copper wire with a diameter of 0.15mm (with an outer polytetrafluoroethylene insulating layer) to connect the control component with the miniature ultraviolet LED, Bluetooth component and power supply component to form a complete circuit.

[0054] (3) Prepare the lower support layer. (31) Using PDMS film as substrate, a honeycomb structure (hexagonal cavity side length 3mm, wall thickness 0.4mm) is formed by molding. (32) Preparation of cellulose aerogel: Prepare a solvent with NaOH, urea and water in a mass ratio of 7:12:81 and cool to -12℃; disperse 2g of natural bamboo fiber in 100g of solvent at a mass ratio of 1:50 and stir vigorously at -12℃ for 30min to obtain cellulose solution; prepare a regeneration solution with a mass ratio of citric acid and acetic acid of 1:4 and add the cellulose solution dropwise to the regeneration solution at a mass ratio of 1:6 and solidify at room temperature for 10min; rinse with deionized water for 13h and exchange with ethanol 4 times to obtain precursor; freeze dry at -50℃ for 42h to obtain cellulose aerogel; fill the cellulose aerogel into the honeycomb-like structure cavity.

[0055] (4) Hot pressing composite.

[0056] (41) Apply a 0.15mm thick hot melt adhesive film (material EVA) between the upper composite insole layer and the power control pad, and between the power control pad and the lower support layer, to ensure that the power control pad corresponds to the arch support part; (42) Place it in a hot press and press it at 85℃ and 0.4MPa for 8 minutes. After cooling, cut it into insole sizes of 30cm×10cm to obtain sterile physiotherapy insoles.

[0057] Example 2 The preparation method of the sterilized physiotherapy insole in Example 2 is basically the same as that in Example 1. The only difference is that in step (2) of Example 2, the mass ratio of titanium dioxide nanoparticles to waterborne polyurethane adhesive is 1:5, the coating thickness is 0.3 mm, the drying temperature is 60 °C and the time is 2 h; in step (3), the honeycomb-like structure has a side length of 2 mm and a wall thickness of 0.3 mm, and the mass ratio of cellulose solution to regeneration solution is 1:5.

[0058] Example 3 The preparation method of the sterilized physiotherapy insole in Example 3 is basically the same as that in Example 1, except that the flexible insole substrate in Example 3 is replaced with a polyurethane (PU) film with a thickness of 1.2 mm; and the insulating flexible substrate is replaced with a polytetrafluoroethylene (PTFE) porous film with an air permeability of 480 mm / s.

[0059] Comparative Example 1 The preparation method of the insole of Comparative Example 1 is basically the same as that of Example 1. The difference is that Comparative Example 1 omits steps (12) and (13), that is, it does not coat the front and back foot areas of the flexible insole substrate with titanium dioxide coating paste, and directly embeds and bonds the micro ultraviolet LEDs to the surface of the PDMS substrate. The remaining steps are the same as those of Example 1.

[0060] Comparative Example 2 The preparation method of the insole of Comparative Example 2 is basically the same as that of Example 1. The difference is that in step (32) of Comparative Example 2, only a honeycomb-like structure is prepared without filling it with cellulose aerogel. The empty honeycomb-like structure is used directly as the lower support layer. The remaining steps are the same as those of Example 1.

[0061] The insoles prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests, and the test items are as follows: (I) Antibacterial performance test: Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922), common pathogens of the soles of the feet, were selected, and the inoculation concentration was 1×10⁻⁶. 6 The bacterial suspension of CFU / mL was cultured with the forefoot area samples (2cm×2cm) of the insoles of Examples 1-3 and Comparative Examples 1-2 at 37℃ for 24h with shaking. The micro UV LED was turned on (working for 1h), and the antibacterial rate was calculated by plate counting method. At the same time, the samples were washed with water 5 times to test the antibacterial rate after washing.

[0062] (II) Breathability test (GB / T 5453-1997): Using a fabric breathability meter, the breathability of different areas (forefoot, arch, and heel) of the insole is tested under a pressure of 100Pa, and the average value is taken; the change in breathability before and after washing is tested to evaluate the stability of breathability.

[0063] (III) Cyclic bending test (GB / T 3903.1-2008): Bending angle ±30°, frequency 30 times / min, 10,000 cycles. After the test, check the coating peeling and aerogel integrity.

[0064] (IV) Pressure Cyclic Test: Apply 0-150 kPa cyclic pressure (1 time / s) to the heel area of ​​the insole using a universal testing machine. After 180,000 cycles, test the deformation rate of the honeycomb structure (measure the change in wall thickness / side length with vernier calipers).

[0065] The performance test results of Examples 1-3 and Comparative Examples 1-2 are shown in Table 1: Table 1 Comparative performance tests revealed that composite insoles prepared with titanium dioxide nanoparticles, combined with the photocatalytic effect of ultraviolet LEDs, exhibited excellent antibacterial properties. Comparative Example 1, lacking titanium dioxide, showed a decreased antibacterial rate. Comparative Example 2, lacking the cavities of a cellulose aerogel-filled honeycomb structure, could not guide gas flow, resulting in reduced breathability and increased deformation after washing, further impacting breathability and weakening the sterilization effect. The preparation method provided in this application can produce insoles with good wearability and integrated sterilization effects; combined with the ultraviolet LEDs, it can achieve a sterilization and therapeutic effect.

[0066] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of this application.

Claims

1. A method for preparing a sterile therapeutic insole, characterized in that, The method comprises the following steps: preparing an upper composite insole layer; preparing a power control pad; preparing a lower support layer; sequentially hot-pressing the upper composite insole layer, the power control layer and the lower support layer to obtain the sterilization physiotherapy insole; The preparation raw material of the upper composite insole layer comprises titanium dioxide and micro ultraviolet LED.

2. The method for preparing sterilized therapeutic insoles according to claim 1, characterized in that, The step of preparing the upper composite insole layer comprises: selecting a flexible insole substrate, and forming an arch support part upwardly protruding in the middle of the arch area through a mold; mixing titanium dioxide nanoparticles and a water-based adhesive to prepare a titanium dioxide coating slurry, and coating the slurry on the forefoot and hindfoot areas of the flexible insole substrate; heating and drying to form a titanium dioxide surface layer; embedding micro ultraviolet LEDs on the titanium dioxide surface layer according to acupoints; The wavelength of the micro ultraviolet LED is 100-280 nm, the working voltage is 2.5-4.0 V, and the light emitting angle is 120°.

3. The method for preparing sterilized therapeutic insoles according to claim 2, characterized in that, The mass ratio of the titanium dioxide nanoparticles and the water-based adhesive is 1:5-8; The coating thickness is 0.3-0.8 mm; The heating and drying temperature is 60-80℃, and the time is 1-2h.

4. The method for preparing sterilized therapeutic insoles according to claim 2, characterized in that, The preparation method of the titanium dioxide nanoparticles comprises the following steps: mixing tetrabutyl titanate and anhydrous ethanol, stirring at 300-500 r / min for 30-40 min; reacting at 110-130℃ for 4-5h; washing with ethanol for 3 times and deionized water for 1 time, and centrifuging at 3700 rpm for 5 min after each washing; drying at 80-90℃ for 24-30h, and calcining at 600-1000℃ for 6-8h; The volume ratio of the tetrabutyl titanate to the anhydrous ethanol is 1:28-30.

5. The method for preparing sterilized therapeutic insoles according to claim 1, characterized in that, The step of preparing the lower support layer comprises: using a flexible insole substrate, and forming a honeycomb-like structure through a mold; preparing a cellulose aerogel, and filling the cellulose aerogel into the cavities of the honeycomb-like structure; The space of the honeycomb-like structure has a side length of 2-5 mm and a wall thickness of 0.3-0.5 mm.

6. The method for preparing sterilized therapeutic insoles according to claim 5, characterized in that, The step of preparing the cellulose aerogel comprises: dispersing natural bamboo fibers in a solvent, and stirring vigorously to obtain a cellulose solution; adding the cellulose solution drop by drop into a regeneration solution, and solidifying; washing with deionized water for 12-15h, and exchanging with ethanol for more than 3 times to obtain a precursor; freeze-drying the precursor for 36-48h.

7. The method for preparing sterilized therapeutic insoles according to claim 6, characterized in that, The solvent is prepared by mixing sodium hydroxide, urea and water in a mass ratio of 7:12:81; The mass ratio of the natural bamboo fibers to the solvent is 1:45-55, and the temperature of the vigorous stirring is -12℃; The regeneration solution is prepared by mixing citric acid and acetic acid in a mass ratio of 1:3-5, and the mass ratio of the cellulose solution to the regeneration solution is 1:5-8.

8. The method for preparing sterilized therapeutic insoles according to claim 2, characterized in that, The step of preparing the power control pad comprises: selecting an insulating flexible substrate, and mounting a control component, a Bluetooth component and a power component on the substrate; welding a microcontroller element and a signal input interface element on the control component; connecting the control component, the micro ultraviolet LED, the Bluetooth component and the power component through wires to form a complete circuit.

9. The method for preparing sterilized therapeutic insoles according to claim 2, characterized in that, The hot-pressing step comprises: 0.1-0.2mm hot-melt adhesive film is coated between the upper composite insole layer and the power control layer and between the power control layer and the lower support layer, and hot-pressing is performed at 80-100℃ and 0.3-0.5MPa pressure for 5-10min; The power control layer is installed at a position corresponding to the arch support part.

10. A sterilizable, therapeutic shoe insert, characterized in that, The sterilization physiotherapy insole is prepared by the preparation method of any one of claims 1-9.

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