An antiperspirant composition comprising a mixture of a first antiperspirant active and a second antiperspirant active

Abstract

The present application relates to the technical field of insoles, and particularly relates to a deodorant insole and a preparation method thereof. The deodorant insole comprises an insole body, the insole body comprises a cloth layer, a foamed cotton layer, a foamed PU layer and a functional component arranged from top to bottom, the functional component comprises tourmaline, natural crystal, bamboo fiber and rare earth particles containing cerium ions and lanthanum ions, and the functional component is located in the foamed cotton layer, or between the cloth layer and the foamed cotton layer, or between the foamed cotton layer and the foamed PU layer. The functional component is matched with the cloth layer, the foamed cotton layer and the foamed PU layer, the problem of short-lasting deodorization, poor air permeability and low comfort of the traditional insole is solved, and the comprehensive effect of long-acting deodorization, comfortable air permeability and safety and environmental protection is achieved.

Description

Technical Field

[0001] This invention relates to the field of insole technology, specifically to an odor-removing insole and its preparation method. Background Technology

[0002] Polyurethane foam insoles are popular in the market due to their softness, elasticity, cushioning, and shock absorption properties, combining comfort and durability. To enhance comfort and expand functionality, these insoles often employ a composite design.

[0003] The soles of the feet have a dense distribution of sweat glands, leading to excessive sweating during increased activity, hot weather, emotional stress, or the consumption of spicy foods. In addition to water and salt, sweat contains lactic acid and urea. Wearing poorly breathable shoes such as sneakers, athletic shoes, or leather shoes hinders sweat evaporation, causing discomfort and potentially leading to foot odor over time. Currently, common insoles require frequent replacement or airing to reduce odor, which negatively impacts the user experience.

[0004] Therefore, there is an urgent need to improve existing insoles to improve the unpleasant feeling of wearing them while ensuring foot support performance, so as to better meet the needs of consumers. Summary of the Invention

[0005] Regarding the aforementioned technical problem that foot odor is easily caused by sweaty feet, requiring frequent replacement or airing of existing insoles to reduce odor and affecting user experience, the technical solution adopted by this invention is as follows: An odor-removing insole includes an insole body, which comprises a fabric layer, a foam cotton layer, a foamed PU layer, and functional components arranged from top to bottom. The functional components include tourmaline, natural crystal, bamboo fiber, and rare earth particles containing cerium and lanthanum ions. The functional components are located in the foam cotton layer, or between the fabric layer and the foam cotton layer, or between the foam cotton layer and the foamed PU layer.

[0006] Specifically, in some embodiments, the foam layer is low-density open-cell PU, and the foam PU layer is medium-high density PU or semi-open-cell PU.

[0007] In this invention, the top fabric layer directly contacts the foot, is soft and skin-friendly with basic breathability, and can distribute pressure when conforming to the foot's curves. The middle foam layer has both moisture-absorbing and cushioning functions. In some embodiments, the capillary effect formed by its openings can quickly absorb foot sweat, while the elasticity of the foam structure alleviates the impact of walking. The lower foam PU layer provides support and breathability. In some embodiments, the semi-open rigidity can prevent the foam layer from collapsing excessively and maintain the overall shape stability of the insole.

[0008] Specifically, bamboo fiber contains the natural antibacterial component bamboo quinone and has good moisture absorption, which can quickly absorb sweat and inhibit the growth of surface bacteria. Rare earth particles containing cerium and lanthanum ions release rare earth metal ions, which have broad-spectrum and long-lasting antibacterial capabilities, interfering with the activity of microbial metabolic enzymes and blocking odor generation at the source. Tourmaline continuously releases negative ions under pressure or moisture conditions, which, through oxidation-reduction reactions, help improve the microenvironment inside the shoe and help reduce odor. At the same time, negative ions combine with positively charged dust and microorganisms in the air and settle, purifying the microenvironment inside the shoe. In some embodiments, natural crystal microparticles act as a rigid medium, improving pressure transmission and increasing the probability of tourmaline contact under pressure. Crystal microparticles have high hardness and stress conductivity, and when stepped on by the foot, they can efficiently transfer vertical mechanical stress to the surface of tourmaline microparticles, synergistically stimulating the piezoelectric and thermoelectric effects of both, thereby increasing the concentration of negative ions released.

[0009] This invention solves the problems of traditional insoles such as short-lasting odor prevention, poor breathability, and low comfort by setting functional components that work in conjunction with the fabric layer, foam layer, and foamed PU layer, achieving a comprehensive effect of long-lasting odor removal, comfortable breathability, safety, and environmental protection.

[0010] Furthermore, the thickness of the fabric layer is between 0.3-1mm, the thickness of the foam layer is between 1-3mm, the thickness of the foamed PU layer is between 3-6mm, the fabric layer is a mesh fabric, and the foam layer is open-cell foam.

[0011] Compared to closed-cell foam layers, the open-cell foam layers of this invention can form vertically connected channels, allowing sweat vapor to pass through the foam layers and transfer vertically to the foamed PU layer, reducing the stuffiness inside the shoes.

[0012] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the high porosity structure of the mesh fabric itself allows sweat vapor to pass through the foam layer and transfer to the foam PU layer, reducing the stuffiness inside the shoe. Combined with 1-3mm thick open-cell foam, the vertical flow resistance of air and moisture is reduced. The fabric layer uses a thin mesh fabric, which shortens the sweat penetration path while ensuring abrasion resistance, allowing sweat from the sole of the foot to be quickly conducted to the underlying functional material. In addition, the open-cell structure of the foam layer provides a soft, enveloping feel, avoiding the foreign body sensation of hard particles on the sole of the foot, and also prevents the sweat transmission path from being too long due to excessive thickness.

[0013] As mentioned earlier, the thick structure of the foamed PU layer provides stable arch support for the insole, and its high elasticity can alleviate foot fatigue during long walks. At the same time, the foamed PU layer has a microporous structure and a higher density than the foamed cotton layer. While providing support, it also quickly wicks away moisture from the composite layer to the outside of the shoe, preventing moisture from seeping back into the fabric layer.

[0014] Furthermore, the bamboo fiber includes a natural bamboo fiber layer or natural bamboo charcoal powder.

[0015] Specifically, the natural bamboo fiber layer retains the natural cellulose structure and antibacterial components such as bamboo quinone, exhibiting excellent hygroscopicity and biocompatibility. It can directly contact sweat, quickly absorbing moisture and inhibiting the growth of surface bacteria. Specifically, the natural bamboo charcoal powder has a well-developed porous structure, possessing a strong physical adsorption capacity for odor molecules such as ammonia and hydrogen sulfide. In some embodiments, it also exhibits a certain amount of far-infrared radiation, which can promote local microcirculation.

[0016] Both the natural bamboo fiber and bamboo charcoal powder are derived from renewable bamboo resources, contain no chemical preservatives or synthetic antibacterial agents, are highly biodegradable, and are non-irritating to human skin, making them suitable for sensitive skin or for prolonged wear. When the natural bamboo fiber layer and bamboo charcoal powder are used in combination, they form a dual deodorizing function of active antibacterial action and passive adsorption. Bamboo fiber inhibits bacterial growth to reduce odor formation, while bamboo charcoal powder captures already generated volatile odor molecules, enhancing the longevity and broad-spectrum deodorizing effect.

[0017] Furthermore, such as Figure 1 As shown, the functional components are disposed in the foamed cotton layer and / or the foamed PU layer. Calculated by mass parts, the foamed cotton layer or the foamed PU layer is 94-96 parts, tourmaline is 1-2 parts, natural crystal is 1-2 parts, bamboo fiber is 1-2 parts, and rare earth particles containing cerium ions and lanthanum ions are 1-2 parts.

[0018] Specifically, before foaming, micron- or nano-sized functional powders are uniformly dispersed in the raw materials at a ratio of 1-2 parts. After foaming, the functional powders are embedded in the cell walls to form a three-dimensional functional network, thereby ensuring the maximum contact area with the airflow and moisture passing through the cells, so that functions such as negative ion release, catalytic decomposition, and physical adsorption can be carried out continuously and efficiently.

[0019] The total filler content of this invention is controlled within a low range, minimizing interference with the flowability, viscosity, nucleation, and growth of the foaming system. This ensures a stable foaming process and yields high-quality foams with uniform cell size, suitable density, and high softness. Excessive filler addition can lead to enlarged cells, cracking, or collapse. Therefore, the low proportion of filler added in this invention ensures a strong bond between the functional components and the substrate, preventing them from detaching or migrating under long-term bending or compression, thus guaranteeing functional durability and product lifespan.

[0020] Furthermore, in this embodiment, the functional components of bamboo fiber powder and bamboo charcoal powder are directly incorporated into the foaming layer, eliminating the need for an additional independent functional film layer or complex lamination process. This simplifies the overall structure and production process of the insole, facilitates large-scale continuous foaming molding, reduces material and processing costs, and avoids reliability issues such as interlayer delamination and displacement.

[0021] Furthermore, such as Figure 3 As shown, the functional components are disposed between the fabric layer and the foam layer, including a bamboo fiber layer loaded with bamboo fiber, a rare earth mineral layer loaded with rare earth particles, and a composite layer loaded with tourmaline microparticles and crystal microparticles, arranged from top to bottom.

[0022] This invention utilizes a bamboo fiber layer to inhibit bacterial growth and provide moisture absorption and breathability. A composite layer enhances the compression between tourmaline and crystal microparticles, promoting the release of negative ions from the tourmaline. The fabric layer, foam layer, and foamed PU layer form excellent ventilation channels, thereby reducing stuffiness and discomfort inside the shoe.

[0023] The bamboo fiber layer of this invention uses natural bamboo fiber, which contains natural antibacterial components such as phenols and flavonoids. It possesses broad-spectrum antibacterial properties, deodorizing properties, and moisture-wicking and breathable characteristics, rapidly inhibiting the growth of harmful bacteria such as Staphylococcus aureus and Escherichia coli in foot sweat. The cellulose molecular chains of bamboo fiber contain a large number of hydrophilic hydroxyl groups, which have strong hydrogen bonds with water molecules, actively adsorbing surrounding moisture and further enhancing the moisture absorption performance of bamboo fiber. The hollow fibers of bamboo fiber, through capillary effect, can quickly adsorb sweat from the fiber surface to the fiber interior and interfiber spaces, achieving rapid sweat drainage. Its porous structure allows for rapid moisture evaporation. The rare earth mineral layer used in this invention slowly releases active ions, interfering with the bacterial cell membrane potential balance and enzyme activity, further enhancing the antibacterial effect. The bamboo fiber layer and the rare earth mineral layer work synergistically to inhibit bacterial growth at the source, blocking the pathway of sweat decomposition and odor production.

[0024] Specifically, the fabric layer uses breathable and sweat-absorbing fabrics such as pure cotton and Coolmax fiber, which can quickly absorb sweat from the soles of the feet. The underlying foam layer preferably has an open-pore structure, through which interconnected micropores guide sweat vapor to the lower layer. The foamed PU layer serves as the bottom layer, and its microporous structure forms breathable channels, allowing moisture to escape from the shoe and thus reducing sweat buildup in the insole.

[0025] Specifically, the composite layer is loaded with tourmaline microparticles and crystal microparticles. Tourmaline can release negative ions, which can neutralize odor molecules. At the same time, tourmaline has a high far-infrared emissivity. When heat is conducted to the tourmaline by the feet, it will radiate this heat back to the skin surface more efficiently in the form of far-infrared rays with a wavelength of 2.5-50μm. Far-infrared rays are absorbed by the superficial tissues of the skin and can directly act on the capillaries of the skin surface, promoting local blood circulation and creating a warm and comfortable feeling. Combined with the moisture-absorbing effect of the bamboo fiber layer, it can reduce the cold feeling caused by sweat taking away heat.

[0026] Based on the above configuration, the foamed PU layer utilizes its high resilience and shock absorption properties to provide stable support and cushioning protection for the feet, while the preferred open-pore design of the foam layer enhances vertical airflow efficiency. When the user walks, the pressure difference generated by the foot's movement forces the hot and humid air inside the insole to quickly escape through the openings, accelerating sweat evaporation and alleviating the stuffy feeling in the feet caused by prolonged wear, keeping the soles of the feet dry.

[0027] Optionally, in some embodiments, after the bamboo fiber layer, rare earth mineral layer, and composite layer are each prepared into a corresponding emulsion, they are sequentially connected to the fabric layer from top to bottom by coating, or sequentially connected to the foam layer from bottom to top by coating. The fabric layer and foam layer are then connected by hot pressing or adhesive bonding. The multilayer coating and adhesive film can be applied using dot-matrix coating, mesh coating, or microporous adhesive film methods.

[0028] Of course, in some embodiments, the composite layer, rare earth mineral layer and bamboo fiber layer can be made into a corresponding emulsion and then coated onto the fabric layer from top to bottom, or the bamboo fiber layer, rare earth mineral layer and composite layer can be coated onto the foam layer from bottom to top, and then the fabric layer and foam layer can be connected by hot pressing or adhesive bonding.

[0029] The bamboo fiber layer of this invention can inhibit bacterial growth and provide moisture absorption and breathability. The crystal microparticles can compress the tourmaline microparticles, stimulating their piezoelectric effect to promote the release of negative ions. Furthermore, the composite layer is located between the fabric layer and the foam layer, allowing heat from the feet to be conducted to the composite layer over a shorter distance. Compared to a composite layer located between the foam layer and the foamed PU layer, the far-infrared radiation effect on the skin surface in this embodiment is better. Moreover, the bamboo fiber layer in this embodiment, positioned between the fabric layer and the composite layer, reduces wear on the fabric layer during compression and minimizes the irritation caused by the composite layer particles, thereby improving comfort. Therefore, this embodiment is suitable for users with abundant sweat glands in their feet, high requirements for moisture absorption, and a strong need for far-infrared effects.

[0030] Furthermore, such as Figure 2 As shown, between the fabric layer and the foam layer, from top to bottom, there is a bamboo fiber layer loaded with bamboo fiber and a rare earth mineral layer loaded with rare earth particles. Between the foam layer and the foamed PU layer, there is a composite layer loaded with tourmaline microparticles and crystal microparticles.

[0031] Compared to closed-cell foam layers, the open-cell foam layers of this invention can form interconnected channels, allowing sweat vapor to pass through the foam layers and transfer vertically to the foamed PU layers, reducing the stuffiness inside the shoes.

[0032] The composite layer is located between the foam layer and the foamed PU layer, and is far from the fabric layer. Heat from the foot needs to travel a longer distance to reach the composite layer. Compared to a composite layer positioned between the fabric and foam layers, the far-infrared rays in this embodiment can radiate to the skin surface. Its direct warming effect on the skin is somewhat weakened compared to a shallower layer, but the negative ion release function is unaffected. This embodiment reduces wear on the fabric layer from the composite layer particles during compression, and also reduces the irritation caused by the composite layer particles on the foot, thereby improving comfort. Therefore, this embodiment is suitable for users with underdeveloped sweat glands in their feet who have high comfort requirements.

[0033] Optionally, in some embodiments, the bamboo fiber layer and the rare earth mineral layer can be formed into a corresponding emulsion and then coated onto the fabric layer from top to bottom, or the rare earth mineral layer and the bamboo fiber layer can be coated onto the foam layer from bottom to top. The fabric layer and the foam layer are then connected by hot pressing or adhesive bonding. The multilayer coating and adhesive film can be applied using dot-matrix coating, mesh coating, or microporous adhesive film methods.

[0034] Optionally, in some embodiments, the composite layer can be formed into a corresponding emulsion, then coated onto the foamed PU layer or the foamed cotton layer, and then the foamed PU layer and the foamed cotton layer can be connected by hot pressing or adhesive bonding.

[0035] Optionally, in some embodiments, the rare earth mineral layer is located on the upper side of the bamboo fiber layer, which can quickly inhibit the growth of bacteria for users with underdeveloped foot sweat glands. Of course, in other embodiments, the bamboo fiber layer is located on the upper side of the rare earth mineral layer, which allows users with well-developed foot sweat glands to first absorb moisture through the bamboo fiber layer and then use the rare earth mineral layer for antibacterial and deodorizing effects.

[0036] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the upper bamboo fiber layer is adjacent to the fabric layer. Utilizing the natural porous structure and moisture absorption of bamboo fiber, it can quickly absorb human sweat that permeates through the fabric layer, reduce the humidity of the foot contact surface, keep the feet dry, and exert its natural antibacterial and anti-mite effects. The lower rare earth mineral layer is adjacent to the foam layer. When sweat or moisture further penetrates into the foam layer, the rare earth metal ions released by the rare earth mineral layer can powerfully kill bacteria, effectively preventing bacteria from invading the open structure of the foam layer for deep growth and fermentation.

[0037] As mentioned above, the bamboo fiber layer is located on the upper side close to the arch of the foot. Its soft and skin-friendly properties can improve the feel of the foot. The rare earth mineral layer located below avoids the discomfort caused by the rare earth minerals directly contacting the foot, ensuring the softness of the shoe, reducing the wear of the fabric layer, and improving the overall hygiene and service life of the insole.

[0038] Optionally, in some embodiments, the bamboo fiber layer serves as a flexible fabric layer, which is connected to the fabric layer using hot melt adhesive or ultrasonic welding, resulting in a tighter interface bond and reducing the likelihood of delamination. When the rare earth mineral layer is connected to the foam layer, the microporous structure of the foam layer can mechanically interlock with the pores of the rare earth mineral layer, enhancing the overall structural strength of the antibacterial layer.

[0039] Furthermore, such as Figure 4 and Figure 5 As shown, the composite layer includes a crystal particle layer loaded with crystal particles and a tourmaline layer loaded with tourmaline particles, arranged from top to bottom.

[0040] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the crystal microparticle layer is connected to the foam layer, and its rigidity can enhance the overall deformation resistance of the composite layer. The tiny particle size of the crystal microparticle layer will not block the open pore structure of the foam, but instead forms an interlocking fixation through micropore filling. The porous load structure of the tourmaline layer and the semi-open pore structure of the foam PU layer form a complementary breathable network. On the one hand, it neutralizes odor molecules by releasing negative ions, and on the other hand, it reduces the surface tension of sweat by far-infrared radiation, promoting the transfer of moisture to the breathable channels of the foam PU layer, which can exhaust moisture to the outside of the shoe.

[0041] Based on the above configuration, the crystal microparticles possess high hardness and excellent pressure conductivity. When a user walks, foot pressure is transmitted through the soft foam layer to the crystal microparticle layer. As a relatively rigid medium, the crystal microparticle layer effectively transmits the dispersed pressure to the underlying tourmaline layer. Tourmaline exhibits piezoelectric and thermoelectric effects, generating an electric charge and releasing negative ions and far-infrared rays when subjected to external pressure or friction. Through the pressure transmission and compression effect of the crystal microparticle layer, the physical activation of the underlying tourmaline microparticles is enhanced, enabling them to continuously and efficiently release negative ions during walking, thereby decomposing odor molecules deep within the insole and improving deodorization efficiency.

[0042] Specifically, the particle size of the crystal microparticles is controlled at 2000-4000 mesh, smaller than the pore size of the foam, to avoid clogging the air channels; the particle size of the tourmaline is controlled at 2000-4000 mesh to ensure uniform dispersion and surface exposure with the resin. The two layers are bonded together through resin penetration, or a mixed single-layer structure can be used to simplify the process and avoid interlayer delamination. Optionally, tourmaline and crystal microparticles are uniformly mixed at a mass ratio of 1:1 to 3:1 to form a single-layer composite structure.

[0043] Furthermore, such as Figure 6 and Figure 7As shown, a first adhesive layer is provided between the fabric layer and the bamboo fiber layer, a second adhesive layer is provided between the rare earth mineral layer and the foam layer, a third adhesive layer is provided between the composite layer and the foam layer, and a fourth adhesive layer is provided between the composite layer and the foam PU layer. Alternatively, a first adhesive layer may be provided between the fabric layer and the bamboo fiber layer, and a second adhesive layer may be provided between the composite layer and the foam layer.

[0044] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the present invention provides a first adhesive layer and a second adhesive layer to firmly bond the bamboo fiber layer to the upper fabric layer, the rare earth mineral layer to the lower foam layer, and so on. When the user engages in high-intensity activities such as running and jumping or walks for a long time, this bonding structure can resist the horizontal shear force and repeated bending stress generated by the foot on the insole, preventing relative slippage, wrinkling or peeling between the fabric layer and other connecting layers, thereby extending the service life of the insole and ensuring the flatness and comfort of wearing it.

[0045] Optionally, in some embodiments, the first and second adhesive layers are preferably environmentally friendly hot melt adhesives or breathable waterborne polyurethane adhesives. A continuous adhesive film is used in edge areas requiring high bond strength, while microporous or dot-matrix coating is used in the central breathable area to balance bond strength and breathability.

[0046] As mentioned above, this invention pre-bonds the rare earth mineral layer and the bamboo fiber layer into a single independent unit, avoiding damage or uneven laying caused by the thinness of a single layer during subsequent assembly, thus improving the production yield. Optionally, in some embodiments, the rare earth mineral layer and the bamboo fiber layer are bonded together by hot pressing or adhesive. The close adhesion between the bamboo fiber and the rare earth mineral layer prevents the interruption of the moisture transmission path due to loosening between the layers, ensuring that sweat can be smoothly transferred from the bamboo fiber layer to the rare earth mineral layer for treatment.

[0047] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the invention bonds the crystal microparticle layer and the tourmaline layer into an integrated composite layer, ensuring no relative displacement between the crystal layer and the tourmaline layer at the microscopic contact surface. When foot pressure is transmitted through the foam layer, the crystal microparticle layer can act as a whole, applying pressure vertically to the tourmaline layer below, avoiding pressure dispersion and energy loss caused by loosening or slipping between layers. This ensures that the kinetic energy generated by each step is efficiently converted into the potential energy that stimulates the tourmaline to release negative ions, improving the deodorization efficiency of the insole during dynamic walking.

[0048] Specifically, due to the differences in hardness and deformation rate between foamed cotton and foamed PU, the composite layer in the middle is susceptible to complex tensile stress. The third and fourth adhesive layers alleviate stress concentration between layers, providing a good transition and anchoring effect. The strong adhesion prevents the composite layer from curling, wrinkling, or breaking under long-term foot pressure, ensuring that the composite layer remains flat and evenly distributed in the stress-bearing center area, thus guaranteeing the performance stability of the insole.

[0049] Optionally, in some embodiments, the third adhesive layer and the fourth adhesive layer are both made of breathable water-based polyurethane adhesive, and the overall thickness of the insole is not increased by the thin coating process.

[0050] As mentioned above, in another embodiment, the present invention pre-bonds the bamboo fiber layer, rare earth mineral layer, and composite layer into an independent whole, avoiding damage or uneven laying caused by the thinness of a single layer during subsequent assembly, thus improving the production yield. Optionally, in some embodiments, the composite layer, rare earth mineral layer, and bamboo fiber layer are bonded together by hot pressing or adhesive. The bamboo fiber, rare earth mineral layer, and composite layer are tightly bonded together, preventing the interruption of the moisture transmission path due to loosening between layers, ensuring that sweat can be smoothly transferred from the bamboo fiber layer to the rare earth mineral layer for treatment.

[0051] Furthermore, such as Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown, the bamboo fiber layer comprises bamboo fiber with a particle size of 400-800 mesh and a first non-woven fabric layer, the thickness of which is between 0.05mm and 0.15mm. The crystal microparticle layer comprises crystal with a particle size of 2000-4000 mesh and a second non-woven fabric layer, the thickness of which is between 0.03mm and 0.08mm. The tourmaline layer comprises tourmaline particles with a particle size of 2000-4000 mesh and a third non-woven fabric layer, the thickness of which is between 0.03mm and 0.08mm. The rare earth mineral layer comprises rare earth particles containing cerium ions and / or lanthanum ions with a particle size of 1000-5000 mesh and a fourth non-woven fabric layer, the thickness of which is between 0.03mm and 0.08mm. The composite layer comprises crystal with a particle size of 2000-4000 mesh, tourmaline particles with a particle size of 2000-4000 mesh, and a fifth non-woven fabric layer.

[0052] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the bamboo fiber layer is composed of 400-800 mesh bamboo fibers combined with the first nonwoven fabric layer. Compared to coarse-particle bamboo fibers with a particle size of less than 200 mesh, the fine particles have a much larger specific surface area and a richer porous structure. The natural bamboo quinone antibacterial components contained therein can come into more full contact with foot sweat and be slowly released, thereby increasing the contact area with sweat and odor molecules, improving the physical adsorption efficiency and the exposure rate of antibacterial active sites, and enabling more sensitive and rapid capture of odor molecules generated instantaneously. At the same time, the fine-particle bamboo fibers can be uniformly dispersed in the fiber network of the first nonwoven fabric layer through electrostatic adsorption or mechanical winding.

[0053] Optionally, in some embodiments, bamboo fiber itself has a certain fresh smell. In the initial stage of use, by slowly releasing the smell of bamboo fiber, it can mask some of the odor and reduce the user's olfactory discomfort.

[0054] Optionally, in some embodiments, the first nonwoven layer is a polyester nonwoven fabric or a viscose nonwoven fabric, whose porous fiber network can firmly hold the bamboo fiber together. At the same time, the nonwoven layer does not cause any irritation when it fits against the skin of the foot, thus improving wearing comfort.

[0055] In addition, the thickness of the bamboo fiber layer is limited to 0.05-0.15mm, which not only reduces the overall weight of the insole but also avoids the bulkiness caused by the superposition of multiple layers; it also avoids the increase in air resistance caused by thickening.

[0056] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the invention uses crystal micro-powder with a particle size of 2000-4000 mesh. Compared to conventional particles below 1000 mesh, the ultrafine powder can form an extremely high-density filling in the second non-woven fabric layer, creating a nearly continuous and dense energy conduction interface. During the stress process, the dense structure can uniformly and diffusely transfer the vertical pressure of the foot to the lower tourmaline layer, avoiding point contact or pressure blind spots caused by coarse particles. This allows the piezoelectric effect of the lower tourmaline to be activated more comprehensively and fully, increasing the total amount of negative ions released and the uniformity of coverage.

[0057] Among them, crystal is a high-hardness mineral. When ground to 2000-4000 mesh, its individual particles can reach the micron level, with a texture as fine as flour. Combined with a thin layer design of 0.03-0.08mm, it can eliminate the grainy, frictional, or uncomfortable feeling that mineral particles can cause to the sole of the foot, maintaining the overall flexibility and comfort of the insole.

[0058] Optionally, in some embodiments, the second nonwoven layer is a polyester nonwoven fabric or a viscose nonwoven fabric, which serves as a carrier for ultra-fine particles. The network structure of the nonwoven fibers enables physical anchoring of the crystal micropowder. Simultaneously, the thickness of 0.03-0.08 mm allows this layer to bend and fold freely with the entire insole without easily breaking or delaminating, ensuring the structural stability of the insole under long-term bending conditions.

[0059] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the present invention processes tourmaline to an ultrafine powder level of 2000-4000 mesh. Compared to particles below 1000 mesh, tourmaline micro-powder at this particle size has a huge specific surface area, which increases the number of electrode surfaces per unit volume, thereby enhancing its spontaneous polarization ability, increasing the release concentration of negative ions and the emissivity of far-infrared rays, and also responding more sensitively to weak pressure changes transmitted from the upper crystal microparticle layer, thus continuously and efficiently decomposing odor molecules during walking, achieving deep purification.

[0060] The tourmaline layer uses the same particle size parameters and similar thickness range as the upper crystal microparticle layer, avoiding interfacial stress concentration or delamination caused by significant differences in particle size between layers, thus ensuring a tight bond between the crystal layer and the tourmaline layer. Controlling the tourmaline layer thickness within the range of 0.03-0.08mm shortens the physical path for negative ions to diffuse outward, reducing the loss of functional factors within the material and allowing them to act more quickly on the foam and fabric layers.

[0061] Optionally, in some embodiments, the third nonwoven layer is a polyester nonwoven fabric or a viscose nonwoven fabric. Combined with the flexible carrier of the third nonwoven layer, this thin-layer structure has bending resistance and can adapt to the frequent large-angle bending deformation of the insole during walking without breaking, thus ensuring the functional stability of the insole.

[0062] This invention processes rare earth particles to a mesh size of 1000-5000. Compared to ordinary micron-sized powders, rare earth particles of this size have a larger specific surface area and more surface active sites. A near-molecular-level dense coating is formed on the fourth nonwoven fabric layer, thereby improving the antibacterial capture and killing rates.

[0063] As mentioned above, rare earth metal ions containing cerium ions and / or lanthanum ions can effectively adsorb and disrupt the potential balance of bacterial cell membranes, or undergo coordination reactions with proteins / enzymes in bacteria, thereby inhibiting bacterial metabolism and causing their death. They have a strong and long-lasting killing effect on Staphylococcus aureus, fungi, and other bacteria that cause foot odor.

[0064] Specifically, due to their redox properties, cerium ions endow the rare earth mineral layer with catalytic oxidation capabilities. They can chemically catalytically degrade stubborn organic odor molecules such as sulfides and amines produced by sweat decomposition, transforming them into odorless substances. This complements the physical adsorption of the upper bamboo fiber layer, solving the potential back-release problem after adsorption saturation.

[0065] In addition, the thin-layer structure of the rare earth mineral layer minimizes the obstruction to the vertical flow of gas, ensuring that the layer maintains its breathability and moisture-wicking properties while exerting a strong chemical bactericidal effect, and will not become a barrier layer for moisture accumulation.

[0066] Optionally, in some embodiments, the fourth nonwoven layer may be made of cellulose acetate nonwoven fabric or polylactic acid nonwoven fabric.

[0067] Furthermore, another object of the present invention is to provide a method for preparing an odor-removing insole, comprising the odor-removing insole as described above, the preparation steps of which are as follows: S1. Prepare each functional component separately; S2. The functional components are prepared into the insole body; S3. The fabric layer, foam cotton layer, and foamed PU layer are connected by hot pressing or adhesive bonding to obtain the finished product.

[0068] This method does not limit the functional components to being added in a single form. The microparticles can be directly mixed into the foaming raw material for co-foaming, or the functional materials can be pre-formed into independent functional layers and then laminated or bonded, thereby adapting to products with different performance requirements or cost positioning.

[0069] In S1, functional components are prepared independently, allowing for targeted surface activation, anti-agglomeration treatment, or slow-release coating. In S2, positioning or uniform dispersion ensures that functional components function efficiently in the insole. The hot pressing or adhesive bonding process in S3 achieves structural curing without damaging the activity of functional components, avoiding high-temperature degradation or chemical deactivation, thereby ensuring the long-term effectiveness of functions such as deodorization, antibacterial properties, and negative ion release.

[0070] Compared to Figures 1 to 7 The implementation method shown, Figures 8 to 15 The implementation method can be regarded as a further improvement on the foregoing embodiments.

[0071] Optionally, in some embodiments, Figure 4 The functional components are combined using a coating and hot-pressing method. Figure 8 exist Figure 4 Based on the previous implementation method, the functional components are combined by coating onto nonwoven fabric and by hot pressing. Figure 9 exist Figure 8Based on the implementation method, the functional components are combined using an adhesive layer, coating and hot pressing method.

[0072] Optionally, in some embodiments, Figure 3 The hot-pressing method is used to combine the functional components. Figure 6 exist Figure 3 Based on the previous implementation method, the functional components are combined using adhesive layers, coating, and hot pressing. Figure 10 exist Figure 3 Based on the previous implementation method, the functional components are combined by coating onto nonwoven fabric and hot pressing. Figure 11 Combination Figure 6 Implementation methods and Figure 10 Based on the previous implementation method, the functional components are combined using adhesive layers, coating, and hot pressing.

[0073] Optionally, in some embodiments, Figure 5 The coating and hot-pressing methods employed are used to combine the functional components. Figure 12 Functional components are combined by coating onto nonwoven fabric and then hot-pressing. Figure 13 exist Figure 12 Based on the implementation method, the functional components are combined using an adhesive layer, coating and hot pressing method.

[0074] Optionally, in some embodiments, Figure 2 The coating and hot-pressing methods employed are used to combine the functional components. Figure 7 exist Figure 2 Based on the previous implementation method, the functional components are combined using adhesive layers, coating, and hot pressing. Figure 13 exist Figure 2 Based on the previous implementation method, the functional components are combined by coating onto nonwoven fabric and hot pressing. Figure 14 Combination Figure 7 Implementation methods and Figure 13 Based on the previous implementation method, the functional components are combined using adhesive layers, coating, and hot pressing.

[0075] Specifically, the deodorizing insole of the present invention has a usage period of 30-45 days, maintaining good breathability and deodorizing effect. Preferably, the deodorizing insole of the present invention has a usage period of 30 days.

[0076] The beneficial effects of this invention are as follows: 1. By setting functional components that match the fabric layer, foam cotton layer, and foam PU layer, this invention solves the problems of traditional insoles such as short-lasting odor prevention, poor breathability, and low comfort, and achieves a comprehensive effect of long-lasting odor removal, comfortable breathability, safety, and environmental protection.

[0077] 2. The preparation method of the present invention is controllable and stable, which not only enables the integration of multiple functional components in the insole, but also takes into account product performance, structural reliability and production efficiency, and can better meet the needs of consumers. Attached Figure Description Figure 1 This is an exploded view of one embodiment of an odor-removing insole according to the present invention. Figure 2 This is an exploded view of a second embodiment of an odor-removing insole according to the present invention. Figure 3 This is an exploded view of a third embodiment of an odor-removing insole according to the present invention. Figure 4 This is a cross-sectional view of a fourth embodiment of an odor-removing insole according to the present invention. Figure 5 This is a cross-sectional view of a fifth embodiment of an odor-removing insole according to the present invention. Figure 6 This is a cross-sectional view of a sixth embodiment of an odor-removing insole according to the present invention. Figure 7 This is a cross-sectional view of the seventh embodiment of an odor-removing insole of the present invention. Figure 8 This is a cross-sectional view of the eighth embodiment of an odor-removing insole of the present invention. Figure 9 This is a cross-sectional view of the ninth embodiment of an odor-removing insole of the present invention. Figure 10 This is a cross-sectional view of ten embodiments of an odor-removing insole according to the present invention. Figure 11 This is a cross-sectional view of an eleventh embodiment of an odor-removing insole according to the present invention. Figure 12 This is a cross-sectional view of the twelfth embodiment of an odor-removing insole according to the present invention. Figure 13 This is a cross-sectional view of thirteenth embodiment of an odor-removing insole of the present invention. Figure 14 This is a cross-sectional view of the fourteenth embodiment of an odor-removing insole of the present invention. Figure 15 This is a cross-sectional view of fifteen embodiments of an odor-removing insole according to the present invention. Detailed Implementation

[0078] To enable those skilled in the art to better understand the technical solutions described in this invention, the following embodiments are provided for illustration. Unless otherwise specified, the raw materials, reagents, or devices used in the following embodiments can be obtained from conventional commercial channels or by existing known methods.

[0079] like Figures 1 to 15 As shown, based on the above, the following are specific embodiments of the present invention: Multi-layer coating uses a mesh coating method.

[0080] The foam layer is made of low-density open-cell PU, and the foamed PU layer is made of medium-high density PU or semi-open-cell PU.

[0081] The pore size of the foam cotton is between 80-150μm.

[0082] A. Preparation of bamboo fiber emulsion: According to the mass fraction, add 70 parts of deionized water, 1 part of dispersant sodium polyacrylate (molecular weight 20000-50000, solid content 30%), and 0.2 parts of silane coupling agent γ-aminopropyltriethoxysilane to a high-speed dispersion kettle, adjust the speed to 800-1000 r / min, and stir for 5 min until the dispersant is completely dissolved; Slowly add 10 parts of 600-mesh natural bamboo fiber, increase the rotation speed to 1500-2000 r / min, and disperse at high speed for 30-40 minutes to ensure that the bamboo fiber is evenly dispersed without agglomeration; Reduce the rotation speed to 500-600 rpm, add 20 parts of water-based polyurethane emulsion, and stir for 20-30 minutes to form a uniform and stable bamboo fiber emulsion. Then add 0.2 parts of BYK-333 leveling agent and polyurethane thickener to adjust the coating viscosity to 2000-5000 cP. Filter the emulsion through a 400-mesh filter to remove large particulate impurities, and set aside for later use to prepare the bamboo fiber emulsion.

[0083] B. Preparation of rare earth mineral emulsion: Add 0.2 parts of γ-aminopropyltriethoxysilane to 2 parts of deionized water, adjust the pH to 4.5, and stir for 30 min for hydrolysis; add 10 parts of 5000 mesh rare earth particles containing cerium ions and lanthanum ions, and disperse at high speed for 20 min to coat the particle surface with coupling agent. Add 75 parts of deionized water to the dispersion vessel, rotate at 800 r / min, add the pretreated rare earth particles, and disperse for 20 min; Add 25 parts of water-based polyurethane emulsion, adjust the speed to 500 r / min, and stir for 30 min to form a rare earth mineral layer emulsion; then add 0.2 parts of BYK-333 leveling agent and polyurethane thickener to adjust the coating viscosity to 1000-2000 cP. Filter the emulsion through a 1000-mesh filter and set aside to prepare the rare earth mineral emulsion.

[0084] C. Preparation of composite layer emulsion: 75 parts of deionized water and 1.2 parts of sodium polyacrylate dispersant (molecular weight 20,000-50,000, solid content 30%) are added to a dispersion vessel and stirred at 800 r / min for 5 min; 5 parts of tourmaline microparticles (2000-4000 mesh) are added and dispersed at high speed for 20 min; then 5 parts of natural crystal microparticles (2000-4000 mesh) are added and dispersed for another 20 min. Add 15 parts of waterborne epoxy resin emulsion and stir at 500 r / min for 25 min to form a composite emulsion; add 0.2 parts of BYK-333 leveling agent and polyurethane thickener to adjust the viscosity to 3000-5000 cp; filter the emulsion through a 400 mesh filter and set aside to prepare a composite layer emulsion.

[0085] D. Preparation of crystal microparticle layer emulsion: 75 parts of deionized water and 1.2 parts of dispersant sodium polyacrylate (molecular weight 20,000-50,000, solid content 30%) are added to the dispersion vessel and stirred at 800 r / min for 5 min; at the same time, 5 parts of crystal microparticles are added and dispersed at 1500 r / min for 40 min. Add 15 parts of water-based epoxy resin emulsion and stir at 500 r / min for 25 min to form a composite emulsion; add 0.2 parts of BYK-333 leveling agent and polyurethane thickener to adjust the viscosity to 3000-5000 cp; filter the emulsion through a 400 mesh filter and set aside to prepare a crystal microparticle layer emulsion.

[0086] E. Preparation of tourmaline layer emulsion: 75 parts of deionized water and 1.2 parts of dispersant sodium polyacrylate (molecular weight 20,000-50,000, solid content 30%) are added to the dispersion vessel and stirred at 800 r / min for 5 min; at the same time, 5 parts of tourmaline microparticles are added and dispersed at 1500 r / min for 40 min. Add 15 parts of water-based epoxy resin emulsion and stir at 500 r / min for 25 min to form a composite emulsion; add 0.2 parts of BYK-333 leveling agent and polyurethane thickener to adjust the viscosity to 3000-5000 cp; filter the emulsion through a 400 mesh filter and set aside to prepare tourmaline layer emulsion.

[0087] The breathable waterborne polyurethane adhesive uses anionic waterborne polyurethane dispersions with microporous film-forming properties. Its solid content is 40%-50%, viscosity is 500-2000 cp, activation temperature is 60℃-70℃, and hot-pressing temperature is 80-100℃. After drying, the adhesive forms a film with a network of micropores, or it can be applied as discontinuous adhesive dots through a spraying process.

[0088] Example 1 Based on the above description, this embodiment has the following implementation methods: like Figure 3As shown, an odor-removing insole includes an insole body 1. The insole body 1 includes, from top to bottom, a fabric layer 2, a foam layer 3, and a foamed PU layer 4. Between the fabric layer 2 and the foam layer 3, there is a bamboo fiber layer 7 loaded with bamboo fiber and a rare earth mineral layer 8 loaded with rare earth metal ions. Between the foam layer 3 and the foamed PU layer 4, there is a composite layer 5, which includes tourmaline microparticles and crystal microparticles. The foam layer 3 has openings. The thickness of the fabric layer 2 is 0.3 mm, the thickness of the foam layer 3 is 1 mm, and the thickness of the foamed PU layer 4 is 3 mm. The fabric layer 2 is a mesh fabric, and the foam layer 3 is open-cell foam.

[0089] The bamboo fiber layer 7 is located above the rare earth mineral layer 8 loaded with rare earth metal ions. The bamboo fiber layer 7 is connected to the fabric layer 2, and the rare earth mineral layer 8 is connected to the foam layer 3. The dry film thickness of the bamboo fiber layer 7 is 0.10 mm, and the dry film thickness of the rare earth mineral layer is 0.05 mm.

[0090] After the bamboo fiber layer 7 and the rare earth mineral layer 8 are made into corresponding emulsions, they are coated and connected to the fabric layer 2 from top to bottom. Then, the fabric layer 2 and the foam layer 3 are connected by hot pressing.

[0091] After the composite layer 5 is made into a corresponding emulsion, it is coated and attached to the foam layer 3. Then, the foamed PU layer 4 and the foam layer 3 are connected by hot pressing. The dry film thickness of the composite layer is 0.05mm.

[0092] Step S1: Preparation of functional emulsions. Bamboo fiber emulsion, rare earth mineral emulsion, and composite layer emulsion were prepared according to the methods described above.

[0093] Step S2: Place the fabric layer with the back side facing up on the coating machine. First, evenly coat the back of the fabric layer with bamboo fiber emulsion, and dry it at 90°C for 3 minutes to form a bamboo fiber layer. At this time, it is in a semi-dry state, and it is not sticky to the touch but becomes sticky at high temperature. Then, coat the surface of the bamboo fiber layer with rare earth mineral emulsion, and dry it at 90°C for 2 minutes to form a rare earth mineral layer. Cover the surface of the rare earth mineral layer with the foam cotton layer, and convey it to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120°C, the pressure is 4 kgf / cm², and the time is 10 seconds. The thermal adhesion of the resin in the emulsion is used to achieve the integrated connection of the fabric layer, bamboo fiber layer, rare earth mineral layer and foam cotton layer.

[0094] Step S3: Apply the composite layer emulsion to the surface of the foamed cotton layer (away from the fabric layer) of the semi-finished product obtained in step S2, and pre-dry it at 90°C for 2 minutes to form a semi-cured state to form a composite layer; cover the surface of the composite layer with the foamed PU layer, and perform a second hot-press bonding. The hot-pressing temperature is set at 120°C, the pressure is 5 kgf / cm², and the time is 15 seconds. After cooling and shaping, cut to obtain the deodorizing insole.

[0095] Example 2 Example 2, based on Example 1, has the following implementation method: like Figure 4 The deodorizing insole shown includes a composite layer 5 comprising a crystal microparticle layer 61 connected to a foamed cotton layer 3 and a tourmaline layer 62 connected to the crystal microparticle layer 61 and the foamed PU layer 4.

[0096] The fabric layer 2 has a thickness of 0.5 mm, the foamed cotton layer 3 has a thickness of 2.5 mm, and the foamed PU layer 4 has a thickness of 4.5 mm.

[0097] After being formulated into corresponding emulsions, the crystal microparticle layer 61 and the tourmaline layer 62 are sequentially attached to the foam layer 3 (away from the fabric layer) from top to bottom by coating. The dry film thickness of the crystal microparticle layer is 0.05 mm, and the dry film thickness of the tourmaline layer is 0.05 mm.

[0098] S1. Place the fabric layer with its back side facing up on the coating machine. First, evenly coat the back of the fabric layer with bamboo fiber emulsion, and dry it at 90°C for 3 minutes to form a bamboo fiber layer (touch dry, retaining thermoplasticity). Then, coat the surface of the bamboo fiber layer with rare earth mineral emulsion, and dry it at 90°C for 2 minutes to form a rare earth mineral layer. Cover the surface of the rare earth mineral layer with the foam layer, and convey it to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120°C, the pressure is 4 kgf / cm², and the time is 10 seconds. The thermal adhesion of the resin in the emulsion is used to achieve the integrated connection of the fabric layer, bamboo fiber layer, rare earth mineral layer and foam layer.

[0099] S2. The crystal microparticle emulsion is evenly coated on the back side of the foam layer 3; it is pre-dried at 80°C for 3 minutes to a semi-cured state. The tourmaline microparticle emulsion is then coated on the surface of the crystal microparticle layer 61; it is then pre-dried at 80°C for 2 minutes to a semi-dry state to form a tourmaline layer 62 with thermal adhesion. The two layers are then hot-pressed together in the pre-cured state.

[0100] S3. The foamed PU layer 4 is applied to the surface of the tourmaline layer 62 and conveyed to a hot press laminating machine for integrated bonding. The hot pressing temperature is set to 115℃-120℃, the pressure to 5kgf / cm², and the hot pressing time to 12 seconds. Under this high temperature and high pressure, the tourmaline layer and the foamed PU layer are fused together, and the crystal microparticle layer achieves dense coupling with the foam layer and the tourmaline layer under pressure. Finally, it is transferred to a cold press plate and cold-pressed (25℃, 3kgf / cm², 30s) to obtain the structurally stable odor-removing insole.

[0101] Example 3 Example 3 has the following implementation method: like Figure 8 As shown, the bamboo fiber layer 7 comprises bamboo fibers with a particle size of 600 mesh and a first nonwoven fabric layer 71, and the thickness of the bamboo fiber layer 7 is 0.1 mm.

[0102] The first nonwoven layer 71 is a polyester nonwoven fabric. Bamboo fiber is made into a bamboo fiber emulsion and is attached to the first nonwoven layer 71 by impregnation.

[0103] Preparation method of bamboo fiber layer: The first nonwoven fabric layer is completely immersed in bamboo fiber emulsion for 2-3 minutes to ensure that the pores of the nonwoven fabric are fully filled with emulsion; a roll dryer is used to remove excess emulsion at a pressure of 0.2 MPa. The bamboo fiber accounts for 30% of the mass of the nonwoven fabric. The squeezed nonwoven fabric is dried in stages by a hot air dryer: the first stage is dried at 80℃ for 1 minute, and the second stage is dried at 85℃ for 1 minute; after drying, it is cooled to room temperature to obtain bamboo fiber layer 7.

[0104] The crystal microparticle layer 61 includes crystals with a particle size of 3000 mesh and a second non-woven fabric layer 611, and the thickness of the crystal microparticle layer 61 is 0.05 mm.

[0105] The second nonwoven layer 611 is a polyester nonwoven fabric. Crystal microparticles are made into a crystal microparticle emulsion and are attached to the second nonwoven layer 611 by impregnation.

[0106] Preparation method of crystal microparticle layer: Immerse the second nonwoven fabric layer in crystal microparticle emulsion for 2 minutes; squeeze dry with a roll dryer at a pressure of 0.2 MPa, with crystal microparticles accounting for 30% of the mass of the nonwoven fabric; dry in a hot air dryer at 85℃ for 1.5 minutes; and obtain the crystal microparticle layer after cooling.

[0107] The tourmaline layer 62 comprises tourmaline particles with a particle size of 3000 mesh and a third nonwoven fabric layer 621, and the thickness of the tourmaline layer 62 is 0.05 mm.

[0108] The third nonwoven layer 621 is a polyester nonwoven fabric. Tourmaline particles are made into a tourmaline microparticle emulsion and are attached to the third nonwoven layer 621 by impregnation.

[0109] Preparation method of tourmaline layer: The third nonwoven fabric layer is immersed in tourmaline particle emulsion for 2 minutes; squeezed dry with a roll dryer at a pressure of 0.2 MPa, with tourmaline particles accounting for 30% of the mass of the nonwoven fabric; dried in a hot air dryer at 85℃ for 1.5 minutes; and obtained after cooling.

[0110] The rare earth mineral layer 8 comprises rare earth particles containing cerium ions and lanthanum ions with a particle size of 3000 mesh and a fourth non-woven fabric layer 81, and the thickness of the rare earth mineral layer 8 is 0.05 mm.

[0111] The fourth nonwoven layer 81 is made of cellulose acetate nonwoven fabric. Rare earth mineral microparticle emulsion containing cerium ions and lanthanum ions is made and attached to the fourth nonwoven layer 81 by impregnation.

[0112] Preparation method of rare earth mineral layer: The fourth nonwoven fabric layer is completely immersed in rare earth emulsion for 1.5-2 min; squeezed dry with a roll dryer at a pressure of 0.15 MPa, with rare earth particles accounting for 25% of the mass of the nonwoven fabric; dried in stages with a hot air dryer: dried at 80℃ for 1 min and at 85℃ for 0.5 min; after cooling, rare earth mineral layer 8 is obtained.

[0113] The bamboo fiber layer 7 and the rare earth mineral layer 8, and the tourmaline layer 62 and the crystal microparticle layer 61 are connected by hot pressing.

[0114] The prepared bamboo fiber layer 7 is stacked on top of the rare earth mineral layer 8 and hot-pressed by a continuous hot-pressing composite machine at a temperature of 115℃, a pressure of 2.0 kgf / cm², and a time of 8 seconds. This temperature can activate the water-based polyurethane resin, but is lower than the melting point of polyester and cellulose acetate. The two non-woven fabrics are tightly bonded together by the cross-linking of the resin between the fibers to form an integrated antibacterial layer.

[0115] A layer of crystal microparticles 61 is stacked on top of a tourmaline layer 62 and hot-pressed using a continuous hot-pressing composite machine at a temperature of 120°C, a pressure of 3.5 kgf / cm², and a time of 10 seconds. At a slightly higher temperature to ensure densification, the two layers of ultra-thin nonwoven fabric are compacted under high pressure, causing the functional particles to interlock and form a high-density composite layer assembly.

[0116] The fabric layer is placed on the coating machine with its back side facing up; the antibacterial layer is placed between the back of the fabric layer and the surface of the foam layer, and then conveyed to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120℃ and the pressure is 4kgf / cm². The fabric layer, bamboo fiber layer and rare earth mineral layer are integrated and connected by utilizing the thermal adhesion of the resin in the emulsion.

[0117] Step S3: The composite layer is placed on the back of the foamed PU layer and the foamed cotton layer of the semi-finished product obtained in step S2, and then subjected to a second hot-press bonding. The hot-pressing temperature is set at 120℃ and the pressure is 5kgf / cm². After cooling and shaping, it is cut to obtain the deodorizing insole.

[0118] Example 4 Example 4 has the following implementation method: like Figure 9 As shown, the rare earth mineral layer 8 and the bamboo fiber layer 7 are hot-pressed together to form an antibacterial layer.

[0119] A first adhesive layer 9 is provided between the antibacterial layer and the fabric layer 2, and a second adhesive layer 10 is provided between the antibacterial layer and the foam layer 3. A third adhesive layer 11 is provided between the composite layer 5 and the foamed cotton layer 3, and a fourth adhesive layer 12 is provided between the composite layer 5 and the foamed PU layer 4. The crystal microparticle layer 61 and the tourmaline layer 62 are hot-pressed together to form a composite layer 5.

[0120] The first adhesive layer 9, the second adhesive layer 10, the third adhesive layer 11, and the fourth adhesive layer 12 all use breathable water-based polyurethane adhesive.

[0121] The breathable waterborne polyurethane adhesive uses anionic waterborne polyurethane dispersions with microporous film-forming properties. Its solid content is 40%-50%, viscosity is 500-2000 cp, and activation temperature is 60℃-70℃. After drying, the adhesive forms a film with a network of micropores, or it can be applied as discontinuous adhesive dots through a spraying process.

[0122] The prepared bamboo fiber layer 7 is stacked on top of the rare earth mineral layer 8 and hot-pressed by a continuous hot-pressing composite machine at a temperature of 115℃, a pressure of 2.0 kgf / cm², and a time of 8 seconds. This temperature can activate the water-based polyurethane resin, but is lower than the melting point of polyester and cellulose acetate. The two non-woven fabrics are tightly bonded together by the cross-linking of the resin between the fibers to form an integrated antibacterial layer.

[0123] A layer of crystal microparticles 61 is stacked on top of a tourmaline layer 62 and hot-pressed using a continuous hot-pressing composite machine at a temperature of 120°C, a pressure of 3.5 kgf / cm², and a time of 10 seconds. At a slightly higher temperature to ensure densification, the two layers of ultra-thin nonwoven fabric are compacted under high pressure, causing the functional particles to interlock and form a high-density composite layer assembly.

[0124] The pre-fabricated antibacterial layer, with the bamboo fiber layer side facing upwards, is conveyed through the adhesive spraying station. A breathable water-based polyurethane adhesive is evenly sprayed onto the surface in a mist form using an automatic spray gun. The adhesive application rate is 15g / m², and the adhesive is distributed in discrete micro-dots, not completely sealing the bamboo fiber pores. The antibacterial layer assembly is then flipped over, and the same mist spraying is performed on the rare earth mineral layer side. Adhesive application rate: 15g / m². The double-sided adhesive-sprayed antibacterial layer assembly is then sent into the drying tunnel and dried at 65℃-75℃ for 2-3 minutes to allow the adhesive layer moisture to evaporate and enter a thermally activated state. While the surface is still slightly sticky, the fabric layer 2 is quickly placed over the surface of the first adhesive layer 9, and the foam layer 3 is placed over the surface of the second adhesive layer 10. The assembly is then fed into a bonding roller or press. Temperature: 100℃, Pressure: 3.0kgf / cm². While protecting the foam from collapse, the breathable bonding of the upper part of the insole is completed.

[0125] Atomized adhesive is sprayed onto one side of the crystal microparticle layer of the prefabricated composite layer assembly. The amount of adhesive in the crystal microparticle layer is increased to ensure adhesion to the foam; the amount sprayed is 20 g / m². Atomized adhesive is also sprayed onto the tourmaline layer of the composite layer assembly, with the amount of adhesive in the tourmaline layer increased to ensure adhesion to the foamed PU layer; the amount sprayed is 25 g / m². The adhesive layers are then activated in a 70℃-80℃ oven. The third adhesive layer 11 is bonded to the bottom surface of the foam layer 3 of the semi-finished product obtained in step S1; the fourth adhesive layer 12 is bonded to the foamed PU layer 4. Finally, hot pressing is performed at 120℃, 3.5 kgf / cm², and 15 seconds. Cooling is then carried out with cold air to room temperature, allowing the adhesive to crystallize and solidify, completing the overall assembly.

[0126] Example 5 Example 5 has the following implementation method: like Figure 2 As shown, an odor-removing insole includes an insole body 1. The insole body 1 comprises, from top to bottom, a fabric layer 2, a foam layer 3, and a foamed PU layer 4. A functional intermediate layer is provided between the fabric layer 2 and the foam layer 3. The functional intermediate layer includes a composite layer 5 loaded with tourmaline microparticles and crystal microparticles, a bamboo fiber layer 7, and a rare earth mineral layer 8. The rare earth mineral layer 8 is located between the bamboo fiber layer 7 and the composite layer 5, with the bamboo fiber layer 7 located on top of the rare earth mineral layer 8. The fabric layer 2 has a thickness of 0.5 mm, the foam layer 3 has a thickness of 2 mm, and the foamed PU layer 4 has a thickness of 4 mm. The composite layer 5 and the bamboo fiber layer 7 are bonded together to form the functional intermediate layer.

[0127] After the bamboo fiber layer 7, rare earth mineral layer 8 and composite layer 5 are made into corresponding emulsions, they are sequentially connected to the lower side of the fabric layer 2 from top to bottom by coating. Then, the fabric layer 2 and the foam layer 3 are connected by hot pressing.

[0128] Step S1: Preparation of functional emulsions. Bamboo fiber emulsion, rare earth mineral emulsion, and composite layer emulsion were prepared according to the methods described above.

[0129] Step S2: Place the fabric layer with the back side facing up on the coating machine. First, evenly coat the back of the fabric layer with bamboo fiber emulsion, and dry it at 90°C for 3 minutes to form a bamboo fiber layer. At this point, it is semi-dry, not sticky to the touch but sticky at high temperatures. Then, coat the surface of the bamboo fiber layer with rare earth mineral emulsion, and dry it at 90°C for 2 minutes to form a rare earth mineral layer. Coat the surface of the rare earth mineral layer with composite layer emulsion, and dry it at 90°C for 2 minutes to form a composite layer. Cover the surface of the composite layer with the foam cotton layer, and convey it to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120°C, the pressure is 4 kgf / cm², and the time is 10 seconds. The thermal adhesion of the resin in the emulsion is used to achieve the integrated connection of the fabric layer, bamboo fiber layer, rare earth mineral layer, composite layer and foam cotton layer.

[0130] Step S3: The foamed cotton layer of the semi-finished product obtained in step S2 is bonded to the foamed PU layer, and then subjected to a second hot-press bonding. The hot-pressing temperature is set to 120℃, the pressure is 5kgf / cm², and the time is 15s. After cooling and shaping, it is cut to obtain the deodorizing insole.

[0131] Example 6 Example 6 has the following implementation method: like Figure 5 The deodorizing insole shown includes a composite layer 5 comprising a crystal microparticle layer 61 connected to a rare earth mineral layer 8, and a tourmaline layer 62 connected to the crystal microparticle layer 61 and the foamed PU layer 4.

[0132] The fabric layer 2 has a thickness of 1 mm, the foamed cotton layer 3 has a thickness of 3 mm, and the foamed PU layer 4 has a thickness of 5 mm. First, the bamboo fiber layer 7 and the rare earth mineral layer 8 are coated from top to bottom on the underside of the fabric layer.

[0133] After the crystal microparticle layer 61 and tourmaline layer 62 are made into corresponding emulsions, they are coated and connected to the lower side of the rare earth mineral layer 8 from top to bottom. Then, the fabric layer 2 and foam layer 3 are connected by hot pressing.

[0134] Step S1: Preparation of functional emulsions. Bamboo fiber emulsion, rare earth mineral emulsion, and composite layer emulsion were prepared according to the methods described above.

[0135] Step S2: Place the fabric layer with the back side facing up on the coating machine. First, evenly coat the back of the fabric layer with bamboo fiber emulsion, and dry it at 90°C for 3 minutes to form a bamboo fiber layer. At this point, it is semi-dry, not sticky to the touch but sticky at high temperatures. Then, coat the surface of the bamboo fiber layer with rare earth mineral emulsion, and dry it at 90°C for 2 minutes to form a rare earth mineral layer. Coat the surface of the rare earth mineral layer with crystal microparticle emulsion, and pre-dry it at 80°C for 3 minutes to a semi-cured state to form a cured crystal microparticle layer 61. Layer tourmaline microparticle emulsion on the surface of the crystal microparticle layer 61. Then pre-dry it at 85°C for 2 minutes to a semi-dry state to form a tourmaline layer 62 with thermal adhesion. The foam layer is placed on the surface of the tourmaline layer and conveyed to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120°C, the pressure is 4 kgf / cm², and the hot pressing time is 10 seconds. The thermal adhesion of the resin in the emulsion is used to achieve the integrated connection of the fabric layer, bamboo fiber layer, rare earth mineral layer, crystal microparticle layer, tourmaline layer and foam layer.

[0136] Step S3: The foamed cotton layer of the semi-finished product obtained in step S2 is bonded to the foamed PU layer, and then subjected to a second hot-press bonding. The hot-pressing temperature is set to 120℃, the pressure is 5kgf / cm², and the hot-pressing time is 12 seconds. After cooling and shaping, it is cut to obtain the deodorizing insole.

[0137] Example 7 Example 7, based on Example 3, changes the position of the composite layer and has the following implementation method: like Figure 12 As shown, the fabric layer, antibacterial layer, composite layer, foam layer, and foamed PU layer are stacked sequentially from top to bottom. The antibacterial layer is then heat-pressed onto the back of the fabric layer, followed by the composite layer, then the foam layer, and finally the foamed PU layer.

[0138] Specifically, the prepared bamboo fiber layer 7 is stacked on top of the rare earth mineral layer 8 and hot-pressed by a continuous hot-pressing composite machine at a temperature of 115℃, a pressure of 2.0 kgf / cm², and a time of 8 seconds. This temperature can activate the water-based polyurethane resin, but is lower than the melting point of polyester and cellulose acetate. The two non-woven fabrics are tightly bonded together through the cross-linking of the resin between the fibers to form an integrated antibacterial layer.

[0139] A crystal microparticle layer 61 is stacked on top of a tourmaline layer 62 and hot-pressed using a continuous hot-pressing composite machine at a temperature of 120°C, a pressure of 3.5 kgf / cm², and a time of 10 seconds. At a slightly higher temperature to ensure densification, the two ultra-thin nonwoven fabric layers are compacted under high pressure, causing the functional particles to interlock and form a high-density composite layer assembly.

[0140] The fabric layer is placed on the coating machine with its back side facing up; the antibacterial layer is placed between the back of the fabric layer and the surface of the composite layer, and then conveyed to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120℃ and the pressure is 4kgf / cm². The fabric layer, bamboo fiber layer, rare earth mineral layer and composite layer are integrated and connected by utilizing the thermal adhesion of the resin in the emulsion.

[0141] Step S3: The foamed cotton layer is placed on the back of the composite layer of the foamed PU layer and the semi-finished product obtained in step S2, and then hot-pressed together for a second time. The hot-pressing temperature is set at 120℃ and the pressure is 5kgf / cm². After cooling and shaping, it is cut to obtain the deodorizing insole.

[0142] Example 8 Example 8 has the following implementation method: like Figure 7 As shown, a functional intermediate layer is formed by a composite of a bamboo fiber layer, a rare earth mineral layer, a crystal microparticle layer, and a tourmaline layer. A first adhesive layer 9 is provided between the functional intermediate layer and the fabric layer 2, and a second adhesive layer 10 is provided between the functional intermediate layer and the foam layer 3. Both the first adhesive layer 9 and the second adhesive layer 10 are made of breathable water-based polyurethane adhesive.

[0143] The prepared bamboo fiber layer 7 is stacked on top of the rare earth mineral layer 8 and hot-pressed by a continuous hot-pressing composite machine at a temperature of 115℃, a pressure of 2.0 kgf / cm², and a time of 8 seconds. This temperature can activate the water-based polyurethane resin, but is lower than the melting point of polyester and cellulose acetate. The two non-woven fabrics are tightly bonded together by the cross-linking of the resin between the fibers to form an integrated antibacterial layer.

[0144] A crystal microparticle layer 61 is stacked on top of a tourmaline layer 62 and hot-pressed using a continuous hot-pressing composite machine at a temperature of 120°C, a pressure of 3.5 kgf / cm², and a time of 10 seconds. At a slightly higher temperature to ensure densification, the two ultra-thin nonwoven fabric layers are compacted under high pressure, causing the functional particles to interlock and form a high-density composite layer assembly.

[0145] The antibacterial layer is stacked on top of the crystal microparticle layer of the composite layer and hot-pressed by a continuous hot-pressing composite machine, with a temperature of 120℃, a pressure of 3.5kgf / cm², and a time of 10 seconds.

[0146] The pre-fabricated antibacterial layer, with the bamboo fiber layer side facing upwards, is conveyed through the adhesive spraying station. A breathable water-based polyurethane adhesive is evenly sprayed onto the surface in a mist form using an automatic spray gun. The adhesive application rate is 15g / m², and the adhesive is distributed in discrete micro-dots, not completely sealing the bamboo fiber pores. The intermediate layer, which is then flipped, is similarly mist-sprayed onto the tourmaline layer side. The adhesive application rate is 20g / m². The double-sided adhesive-sprayed antibacterial layer assembly is then placed in an oven and dried at 65℃-75℃ for 2-3 minutes to allow the adhesive layer moisture to evaporate and enter a thermally activated state. While the surface is still slightly sticky, the fabric layer 2 is quickly placed over the surface of the first adhesive layer 9, and the foam layer 3 is placed over the surface of the second adhesive layer 10. The assembly is then fed into a bonding roller or press. Temperature: 100℃, Pressure: 3.0kgf / cm². While protecting the foam from collapse, the breathable bonding of the upper part of the insole is completed.

[0147] The upper half of the pre-made insole is bonded to the foamed PU layer 4. Finally, it is hot-pressed at 120℃, 3.5 kgf / cm², for 15 seconds. Cooling: The insole is cooled to room temperature with cold air, allowing the adhesive to crystallize and solidify. After cooling and setting, it is cut to obtain the deodorizing insole.

[0148] Example 9 Example 9 has the following implementation method: like Figure 1 As shown, the functional components are located in the foam layer 3.

[0149] Step M1: Bamboo Fiber Treatment: Cut natural bamboo fibers into short fibers with a length of 0.5-1mm, or grind them into 600-mesh powder. The short fibers are used to prevent clogging of the foaming machine nozzle. Place the bamboo fibers in an oven at 100℃-105℃ and dry for 3-4 hours, controlling the moisture content to be below 0.5%. PU foam is extremely sensitive to moisture. If the bamboo fibers contain water, they will react with isocyanates to generate excess bubbles, causing the cell structure to collapse or become brittle. Therefore, thorough drying is essential.

[0150] Tourmaline, natural crystal, and rare earth particles were ground to 2000-3000 mesh, and the three powders were mixed. Silane coupling agent KH-550 was added to water at a ratio of 1:10 and hydrolyzed for 30 minutes. The pH was adjusted to 4.5, and the mixture was sprayed onto the powder surface and dried at 80℃ for 2 hours to complete surface modification. The coupling agent improves the compatibility between inorganic mineral powders and organic resins, preventing the powders from settling or agglomerating in the foaming solution.

[0151] Step M2: Add the dried bamboo fiber lint, modified tourmaline powder, natural crystal powder, and rare earth particles processed in Step S1 to component A, the polyether polyol. The addition amounts are 1 part bamboo fiber lint, 1 part tourmaline, 1 part natural crystal, and 1 part rare earth particles containing cerium and lanthanum ions. Use a high-speed shear disperser to stir and disperse at 2000-3000 r / min for 20-30 min, and circulate cooling to control the material temperature below 30℃ until all functional components are uniformly suspended in the polyol, thus obtaining functional modified material A. Subsequently, add the foaming agent, catalyst, foam stabilizer, and cell opener, stir at low speed until uniform, and maintain a constant temperature of 25℃-30℃ for later use.

[0152] Step M3: Inject the prepared functional modified material A and component B isocyanate into the mixing head of the foaming machine at a weight ratio of 100:50. Set the mixing head speed to 4000-6000 r / min to ensure that the two components are fully mixed instantly and begin the chemical reaction.

[0153] The mixture is poured into a mold preheated to 45℃-55℃. Within the mold, the mixture undergoes a cross-linking and foaming reaction, expanding in volume and solidifying. The curing time is 10-15 minutes, and the curing temperature is maintained at 50℃-60℃.

[0154] Step M4: Demold and remove the rough blank, then leave it at room temperature for 24 hours for post-curing, forming a connected, breathable network inside the foam. Slice it according to the designed thickness to obtain the foam layer.

[0155] The foamed cotton layer is covered on the surface of the fabric layer 2 and conveyed to the hot press roller for hot pressing and bonding. The hot pressing temperature is set to 120℃ and the pressure is 4kgf / cm² to obtain a semi-finished product.

[0156] The foamed PU layer is covered on one side of the foamed cotton layer of the obtained semi-finished product, and then subjected to a second hot-press bonding. The hot-pressing temperature is set at 120℃ and the pressure is 5kgf / cm². After cooling and shaping, it is cut to obtain the deodorizing insole.

[0157] Example 10 Example 10, based on Example 9, involves coating and slow-release modification of natural bamboo fiber, and has the following implementation method: Step N1: Take 100 parts of natural bamboo fiber short fibers with a length of 0.5-1mm, 5-10 parts of β-cyclodextrin, 2-3 parts of chitosan, and 500 parts of deionized water; Step N2: Dissolve chitosan in a weakly acidic aqueous solution with a pH of 5.0-6.0, then add β-cyclodextrin, stir to dissolve, adjust the pH to neutral, and prepare a coating solution; Step N3: Immerse the bamboo fiber short fibers in the coating and finishing solution of step N2, and stir at low speed at 40℃-50℃ for 30-60 minutes for impregnation. Step N4: Take out the soaked bamboo fiber, centrifuge to dehydrate it, and then place it in an oven to dry at a low temperature of 80°C until the moisture content is less than 0.5%.

[0158] The remaining implementation methods and components are the same as in Example 9.

[0159] During the foaming reaction stage, the chitosan / cyclodextrin coating layer attached to the surface of bamboo fiber forms a physical barrier, which to some extent blocks the direct contact between isocyanate and the hydroxyl groups on the bamboo fiber surface, reducing the possibility of the active ingredients of bamboo fiber being deactivated due to chemical bonding during the foaming process. Although the amino groups in the chitosan molecules may react with isocyanate, the coating layer forms a dense film after drying, and the reaction preferentially occurs on the surface of the coating layer, effectively protecting the active ingredients of bamboo fiber. When used as a finished insole, chitosan and cyclodextrin are hydrophilic. Upon contact with foot sweat, the coating layer swells, forming a hydrogel network. The bamboo kun loaded in the bamboo fiber is slowly released through diffusion; at the same time, the cavity structure of β-cyclodextrin may encapsulate some bamboo kun molecules, which are released through displacement under the action of moisture, thereby achieving long-lasting antibacterial effect and protecting the natural components from the damage caused by the high temperature of foaming.

[0160] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 follows the process of Example 1, but omits all functional layer coating steps and directly hot-presses three-layer substrate.

[0161] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 prepares bamboo fiber emulsion and coats it according to steps S1 and S2 of Example 1, omitting the rare earth mineral layer and composite layer, and directly hot-presses the three-layer substrate.

[0162] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 follows the process of Example 1, but step S3 omits the composite layer coating and directly hot-presses the foamed PU layer.

[0163] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 follows the process of Example 1, but replaces the open-cell foam with closed-cell foam of the same density.

[0164] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that Comparative Example 5 follows the process of Example 1, but replaces the bamboo fiber layer and rare earth mineral layer with a nano silver coating with a thickness of 0.15 mm.

[0165] Comparative Example 6 The difference between Comparative Example 6 and Example 4 is that Comparative Example 6 uses the same process as Example 4, but is laminated with a non-breathable polyurethane adhesive and a common water-based adhesive. Otherwise, it is the same as Example 4.

[0166] Comparative Example 7 The difference between Comparative Example 7 and Example 5 is that Comparative Example 7 follows the process of Example 5, but places the composite layer on top close to the fabric layer and the bamboo fiber layer on the bottom close to the foam layer. Otherwise, it is the same as Example 5.

[0167] Comparative Example 8 The difference between Comparative Example 8 and Example 9 is that Comparative Example 8 follows the process of Example 9, but without adding bamboo fiber; otherwise, it is the same as Example 9.

[0168] Comparative Example 9 The difference between Comparative Example 9 and Example 9 is that Comparative Example 9 follows the process of Example 9, but does not add a rare earth mineral layer; otherwise, it is the same as Example 9.

[0169] Comparative Example 10 The difference between Comparative Example 10 and Example 9 is that Comparative Example 10 follows the process of Example 9, but without adding a composite layer; otherwise, it is the same as Example 9.

[0170] Comparative Example 11 The difference between Comparative Example 11 and Example 9 is that Comparative Example 11 follows the process of Example 9, but does not use a pore-opening agent; otherwise, it is the same as Example 9.

[0171] Comparative Example Twelve The difference between Comparative Example 12 and Example 9 is that Comparative Example 12 follows the process of Example 9, but replaces bamboo fiber and rare earth particles with an equal amount of nano silver, while the rest is the same as Example 9.

[0172] Test method: 1. Static test of negative ion release: Place the sample in a sealed test chamber and record the peak and average concentration of negative ions in the chamber every 5 minutes using an air negative ion detector.

[0173] 2. Dynamic test of negative ion release: Place the sample in a sealed test chamber and use a dynamic stepping simulator at a frequency of 1Hz (simulating normal walking frequency) and a pressure of 3-5kgf / cm² to simulate normal walking frequency and foot pressure for 30 minutes. Record the peak and average concentration of negative ions in the chamber every 5 minutes.

[0174] 3. Air permeability: Refer to GB / T 5453-1997 "Determination of air permeability of textile fabrics" and use an air permeability tester to test the amount of air passing through a unit area sample per unit time under a pressure difference of 100Pa, with the unit being mm / s; test 3 different points for each sample and take the average value.

[0175] 4. Moisture permeability: Refer to GB / T 12704.1-2021 "Textiles - Test Methods for Moisture Permeability - Part 1: Moisture Absorption Method", and use the moisture permeation cup method to test the mass of water vapor passing through a unit area of ​​the sample within 24 hours, with the unit being g / (m²·24h); two parallel tests are performed for each sample, and the average value is taken.

[0176] 5. Aging test: The performance was tested after being placed at a temperature of 50±2℃, humidity of 75±5% RH, and UV-A 340nm light at 0.6W / m² for 7 days.

[0177] Table 1. Performance testing results for Examples 1 to 10

[0178] Table 2. Performance testing of Examples 1 to 10 after aging test

[0179] Table 3. Performance testing results of Comparative Examples 1 to 12

[0180] Table 4. Performance testing of Comparative Examples 1 to 12 after aging test

[0181] As shown in Tables 1 and 2, the pressure test values ​​are significantly higher than the static test values, demonstrating the piezoelectric activation effect of the crystal microparticles on the tourmaline. Examples 3 and 7, due to their non-woven fabric loading structure, are significantly superior to the coating type of Example 1 in terms of air permeability, antibacterial rate, and negative ion release. Examples 2, 3, 6, 7, and 8 show significantly higher negative ion release than Examples 1 and 9. The pressure is transmitted through the hardness of the crystal, activating the piezoelectric effect of the tourmaline, thereby releasing more negative ions to neutralize odors. Although Example 9 is a one-piece foam, the functional powder is encapsulated inside the foam layer, and some active points are covered, resulting in a slightly lower negative ion release, but it still possesses deodorizing function.

[0182] Examples 4 and 8, due to the use of specific breathable waterborne polyurethane adhesive and automated spraying process, exhibit significantly higher peel strength than other examples. While the peel strength decreases slightly after aging, it remains at a high level.

[0183] Examples 9 and 10, by directly incorporating the functional components into the foaming raw material, ensured the functional powder was evenly distributed on the cell walls, maximizing the contact area and forming a three-dimensional antibacterial network. This resulted in the elimination of bacteria whether they grew on the surface or deep within the cell, thus achieving the highest initial antibacterial rate. Example 10, due to the chitosan / cyclodextrin encapsulation and slow-release treatment of the bamboo fiber, maintained an extremely high antibacterial rate even after aging tests, demonstrating its long-lasting effect.

[0184] As shown in Tables 3 and 4, Comparative Examples 1, 2, 3, and 10, lacking a composite layer, exhibited extremely low negative ion release levels, demonstrating that the composite layer of this invention is the core component for generating negative ions. Although Comparative Example 7 possessed a composite layer, the layer sequence was reversed, resulting in decreased pressure conduction efficiency and a significantly lower increase in negative ion levels under pressure testing compared to Example 5.

[0185] Comparative Example 4 used closed-cell foam, Comparative Example 6 used ordinary water-based adhesive, and Comparative Example 11 used non-open-cell foam treatment. The air permeability and moisture permeability of these comparative examples decreased, verifying that the open-cell structure, mechanical perforation process, and breathable adhesive contribute to the insole's heat dissipation and moisture wicking performance. Comparative Example 6, using ordinary adhesive, while having acceptable initial strength, sacrificed breathability while meeting peel strength requirements due to the lack of a microporous structure. In contrast, Examples 4 and 8, using breathable water-based polyurethane adhesive, achieved a balance between high bonding strength and high breathability. As can be seen from the above, under the same density conditions, although closed-cell foam can provide similar mechanical support and functional component carrier function, its independent pores and lack of vertically connected channels lead to a sharp increase in the migration resistance of sweat vapor in the thickness direction of the insole, hindering the insole's heat dissipation and moisture wicking performance. Therefore, the present invention uses an open-cell foam layer to form vertically connected channels, which plays an irreplaceable role in reducing stuffiness inside the shoe and keeping the soles of the feet dry.

[0186] Although both Comparative Example 5 and Comparative Example 12 had high initial antibacterial rates, after aging tests, the performance degradation of Comparative Example 5 was greater than that of the antibacterial layer formed by the combination of bamboo fiber and rare earth particles containing cerium and lanthanum ions. The performance degradation of Comparative Example 12 was much greater than that of Example 10, which used chitosan / cyclodextrin sustained-release coating treatment. This demonstrates the high stability and long-lasting effect of the antibacterial layer and coating treatment material of the present invention.

[0187] This invention solves the problems of traditional insoles such as poor odor control, poor breathability, and low comfort by setting functional components that match the fabric layer, foam layer, and foam PU layer, achieving a comprehensive effect of long-lasting odor removal, comfortable breathability, safety, and environmental protection.

[0188] The preparation method of the present invention is controllable and stable, which not only enables the integration of multiple functional components in the insole, but also takes into account product performance, structural reliability and production efficiency, and can better meet the needs of consumers.

[0189] The above examples are merely illustrative of the technical content of the present invention to facilitate easier understanding by the reader, but do not imply that the implementation of the present invention is limited to these examples. Any technical extensions or re-creations made based on the present invention are protected by the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An odor-removing insole, comprising an insole body (1), characterized in that: The insole body (1) includes a fabric layer (2), a foam cotton layer (3), a foam PU layer (4), and functional components arranged from top to bottom. The functional components include tourmaline, natural crystal, bamboo fiber, and rare earth particles containing cerium ions and lanthanum ions. The functional components are located in the foam cotton layer (3), or between the fabric layer (2) and the foam cotton layer (3), or between the foam cotton layer (3) and the foam PU layer (4).

2. The deodorizing insole according to claim 1, characterized in that, The thickness of the fabric layer (2) is between 0.3-1mm, the thickness of the foam layer (3) is between 1-3mm, the thickness of the foam PU layer (4) is between 3-6mm, the fabric layer (2) is a mesh fabric, and the foam layer (3) is an open-cell foam.

3. The deodorizing insole according to claim 1, characterized in that: The bamboo fiber includes a natural bamboo fiber layer or natural bamboo charcoal powder. The particle size of the bamboo fiber is between 400 and 800 mesh. The particle size of the natural crystal is between 2000 and 4000 mesh. The particle size of the tourmaline is between 2000 and 4000 mesh. The particle size of the rare earth particles is between 1000 and 5000 mesh.

4. The deodorizing insole according to claim 1, characterized in that: The functional components are disposed in the foamed cotton layer (3) and / or the foamed PU layer (4). By mass, the foamed cotton layer (3) or the foamed PU layer (4) is 94-96 parts, tourmaline is 1-2 parts, natural crystal is 1-2 parts, bamboo fiber is 1-2 parts, and rare earth particles containing cerium ions and lanthanum ions are 1-2 parts.

5. The deodorizing insole according to claim 1, characterized in that: The functional components are arranged between the fabric layer (2) and the foam layer (3), including a bamboo fiber layer (7) loaded with bamboo fiber, a rare earth mineral layer (8) loaded with rare earth particles, and a composite layer (5) loaded with tourmaline particles and crystal particles arranged from top to bottom.

6. The deodorizing insole according to claim 1, characterized in that: Between the fabric layer (2) and the foamed cotton layer (3), there is a bamboo fiber layer (7) loaded with bamboo fiber and a rare earth mineral layer (8) loaded with rare earth particles from top to bottom. Between the foamed cotton layer (3) and the foamed PU layer (4), there is a composite layer (5) loaded with tourmaline particles and crystal particles.

7. The deodorizing insole according to claim 1, characterized in that: The composite layer (5) includes a crystal particle layer (61) loaded with crystal particles and a tourmaline layer (62) loaded with tourmaline particles, arranged from top to bottom.

8. The deodorizing insole according to claim 1, characterized in that, A first adhesive layer (9) is provided between the fabric layer (2) and the bamboo fiber layer (7), a second adhesive layer (10) is provided between the rare earth mineral layer (8) and the foam cotton layer (3), a third adhesive layer (11) is provided between the composite layer (5) and the foam cotton layer (3), and a fourth adhesive layer (12) is provided between the composite layer (5) and the foam PU layer (4). Alternatively, a first adhesive layer (9) may be provided between the fabric layer (2) and the bamboo fiber layer (7), and a second adhesive layer (10) may be provided between the composite layer (5) and the foam layer (3).

9. The deodorizing insole according to claim 7, characterized in that, The bamboo fiber layer (7) includes bamboo fiber and a first nonwoven fabric layer (71), the thickness of which is between 0.05mm and 0.15mm. The crystal microparticle layer (61) includes crystal and a second nonwoven fabric layer (611), the thickness of which is between 0.03mm and 0.08mm. The tourmaline layer (62) includes tourmaline particles and a third nonwoven fabric layer (621), the thickness of which is between 0.03mm and 0.08mm. The rare earth mineral layer (8) includes rare earth particles and a fourth nonwoven fabric layer (81), the thickness of which is between 0.03mm and 0.08mm. The composite layer (5) includes crystal, tourmaline particles and a fifth nonwoven fabric layer (521).

10. A method for preparing an odor-removing insole, characterized in that, The deodorizing insole according to any one of claims 1-9 is prepared by the following steps: S1. Prepare each functional component separately; S2. The functional components are prepared into the insole body (1). S3, the fabric layer (2), the foam cotton layer (3), and the foam PU layer (4) are connected by hot pressing or adhesive bonding to obtain the finished product.

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