Perilla antibacterial insole and preparation method thereof
Patent Information
- Application Number
- CN202610922189.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-25
- Publication Date
- 2026-08-21
AI Technical Summary
人体足部汗腺分布密集，行走、运动过程中易大量出汗，鞋内密闭潮湿的环境会成为金黄色葡萄球菌、大肠杆菌、白色念珠菌等致病菌大量繁殖的温床，细菌分解汗液中的有机物会产生刺激性异味，进而引发脚臭、脚癣、脚气等足部问题，严重影响使用体验与足部健康
本发明首次将紫苏提取物、壳聚糖与茶多酚联合应用于鞋垫面层。紫苏醛、紫苏醇破坏菌体细胞膜，实现高效抑菌并能直接分解异味分子；壳聚糖形成阳离子保护膜，通过静电吸附作用辅助抑制微生物；茶多酚提供抗氧化保护，延缓紫苏活性成分失效，形成破膜抑菌、电荷吸附、抗氧化分解三重机制协同，同时解决抗菌、消臭、耐久技术难题。
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Figure CN122604158A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of insole preparation technology, specifically relating to a perilla antibacterial insole and its preparation method. Background Technology
[0002] Insoles are essential accessories for everyday footwear, primarily serving to cushion, absorb shock, absorb moisture, and enhance wearing comfort. The human foot has a dense distribution of sweat glands, and sweating is common during walking and exercise. The enclosed, damp environment inside shoes becomes a breeding ground for pathogenic bacteria such as Staphylococcus aureus, Escherichia coli, and Candida albicans. The decomposition of organic matter in sweat by these bacteria produces irritating odors, leading to foot problems such as foot odor, athlete's foot, and fungal infections, severely impacting user experience and foot health.
[0003] Currently, mainstream antibacterial insoles on the market are mainly divided into two categories: one is pure textile antibacterial insoles, such as the pineapple fiber blended insoles disclosed in existing patents, which rely on nano-silver to achieve antibacterial effects. However, this not only poses a risk of heavy metal residue but also results in poor fabric support and cushioning, making them prone to deformation with long-term use. The other category is herbal fiber felt insoles, such as the multi-herb hemp felt material disclosed in existing patents. This material uses a complex formula of various Chinese medicinal herbs such as sophora flavescens and cloves, resulting in high raw material costs. Furthermore, the long-term overall impregnation process makes the antibacterial components prone to detachment and results in poor water resistance. Meanwhile, existing single polyurethane insoles only provide basic cushioning and anti-slip functions and lack long-lasting antibacterial and deodorizing capabilities. Some multi-layer composite antibacterial insoles use synthetic antibacterial films, which have complex manufacturing processes, high production costs, and insufficient natural safety.
[0004] Therefore, developing an insole with natural perilla as the core antibacterial component, while also providing support and cushioning, moisture absorption and wicking, long-lasting antibacterial and deodorizing effects, water resistance, and easy mass production has become the research direction in this field. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a perilla antibacterial insole and its preparation method. This invention involves loading an antibacterial composition formed by compounding perilla extract, chitosan, and tea polyphenols onto a four-groove polyester / cotton / viscose fiber blended mesh surface layer, and then combining it with a PU elastic foam bottom layer to obtain a perilla antibacterial insole that combines highly effective antibacterial properties, long-lasting deodorization, good breathability and cushioning, and water resistance.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: A perilla antibacterial insole is formed by bonding and pressing a PU elastic foam bottom layer with a perilla antibacterial fiber mesh top layer. The bottom layer of the PU elastic foam is an open-cell polyurethane foam; The perilla antibacterial fiber web surface layer is woven from a mixture of four-channel polyester fiber, cotton fiber and viscose fiber, and its interior and surface are loaded with a perilla antibacterial composition.
[0007] Furthermore, the perilla antibacterial composition comprises perilla extract, chitosan, and tea polyphenols in a mass ratio of 1-3:0.1-0.5:0.5-2; the perilla extract is prepared by water decoction and low-temperature ethanol extraction, and its active ingredients are perillaldehyde and perillyl alcohol; the loading of the perilla antibacterial composition is 0.5-3.0% of the dry weight of the perilla antibacterial fiber web surface layer.
[0008] Furthermore, the mass ratio of the four-channel polyester fiber, cotton fiber, and viscose fiber is 2-4:1:1.5-3; the perilla antibacterial fiber web surface layer is woven with a 1 / 2 twill weave.
[0009] Furthermore, the heel anti-slip area of the PU elastic foam bottom layer is integrally formed with hemispherical anti-slip bumps, the height of which is 0.3~0.8mm and the density is 20~50 bumps / cm².
[0010] Furthermore, the density of the open-cell polyurethane foam is 0.15–0.30 g / cm³. 3 The thickness is 2.0 to 4.0 mm.
[0011] Through the above technical solutions, perillaldehyde and perillyl alcohol in perilla extract can penetrate the cell membranes of Staphylococcus aureus, Escherichia coli, and Candida albicans, disrupting cell membrane integrity, interfering with bacterial metabolism and energy synthesis, inhibiting bacterial proliferation, and causing bacterial inactivation. Chitosan, a natural cationic antibacterial agent, can encapsulate bacteria through charge adsorption, blocking contact between microorganisms and nutrients. The two work synergistically to enhance the antibacterial spectrum and efficiency. Foot odor is mainly composed of volatile organic acids and amines produced by the decomposition of sweat by microorganisms. The active ingredients of perilla can directly decompose these odor molecules and reduce odor generation at the source by inhibiting microbial growth. Tea polyphenols have strong antioxidant properties, which can delay the oxidation and deterioration of sweat, further enhancing the deodorizing effect.
[0012] The present invention also provides a method for preparing the above-mentioned perilla antibacterial insole, comprising the following steps: S1. Preparation of PU elastic foam bottom layer: Polyether polyol, isocyanate, foaming agent, cell opener and catalyst are mixed and stirred at a constant temperature of 40-55℃ to foam. The mixture is then injected into a mold and cooled to solidify, resulting in PU foam blank. The blank is then die-cut and hemispherical anti-slip protrusions are pressed into the heel area using an embossing device for later use. S2. Preparation of the perilla antibacterial fiber mesh surface layer: Four-groove polyester fiber, cotton fiber, and viscose fiber are mixed and spun in a certain mass ratio and woven to obtain a fiber web fabric; the fiber web fabric is steam sterilized, and then impregnated, dried, and heat-set with an antibacterial finishing liquid to obtain the perilla antibacterial fiber web surface layer; S3. Hot-pressed composite: Adhesive is applied to the upper surface of the PU elastic foam bottom layer, and the perilla antibacterial fiber mesh surface layer is attached. The mixture is then sent into a hot press molding machine for hot pressing and lamination to obtain the perilla antibacterial insole.
[0013] Through the above technical solution, the padding and heat setting process is adopted so that the perilla composite antibacterial components not only adhere to the fiber surface, but also penetrate into the fiber interior, forming intermolecular bonds and physical entanglement with the fiber, thus avoiding the loss of a large amount of antibacterial components during the washing process; at the same time, tea polyphenols can inhibit the oxidation and decomposition of perilla aldehyde and perilla alcohol, delay the failure of active ingredients, and ensure that the insole still has stable antibacterial and deodorizing properties after multiple washes.
[0014] Furthermore, in step S2, the yarn doubling process is carried out using a three-stage doubling process.
[0015] Further, in step S2, the method for preparing the antibacterial finishing solution is as follows: the perilla raw material is soaked, decocted, filtered and the decoction is collected. The residue is extracted with ethanol and the extracts are combined. Then chitosan and tea polyphenols are added in sequence, stirred evenly and diluted with water to a total solid content of 1% to 5% to obtain the antibacterial finishing solution.
[0016] Furthermore, in step S2, the immersion rolling adopts a two-immersion two-roll process with a rolling yield of 70%~90%.
[0017] Furthermore, in step S3, the process parameters for hot-pressing composite are: hot-pressing temperature of 60~90℃, pressure of 0.2~0.5MPa, and holding time of 10~30s.
[0018] The beneficial effects of this invention are: This invention is the first to combine perilla extract, chitosan, and tea polyphenols in the surface layer of shoe insoles. Perillaldehyde and perillyl alcohol disrupt the cell membrane of bacteria, achieving highly efficient antibacterial activity and directly decomposing odor molecules; chitosan forms a cationic protective film, which assists in inhibiting microorganisms through electrostatic adsorption; tea polyphenols provide antioxidant protection, delaying the deactivation of perilla's active ingredients, thus forming a synergistic triple mechanism of membrane-breaking antibacterial action, charge adsorption, and antioxidant decomposition, while simultaneously solving the technical challenges of antibacterial, deodorizing, and durable products.
[0019] In this invention, the rapid moisture-wicking structure of the four-groove polyester fiber, the moisture absorption properties of cotton / viscose fiber, and the twill weave design enable the fiber web to have the functions of rapid sweat wicking, skin-friendly breathability, and efficient loading of antibacterial components. The porous fiber web on the surface layer quickly absorbs sweat from the soles of the feet, the four-groove polyester fiber achieves moisture wicking and sweat-wicking, and the perilla composite antibacterial components continuously release effective ingredients in a humid environment, inhibiting the reproduction of pathogenic bacteria on the soles of the feet and degrading odor.
[0020] This invention uses a padding and heat setting process to cross-link the perilla composite antibacterial components with the fiber, achieving a strong load through physical winding and intermolecular bonding. Combined with the antioxidant effect of tea polyphenols, the insole's antibacterial rate and deodorizing effect do not significantly decrease after multiple washes.
[0021] This invention features a soft and skin-friendly blended fiber mesh, a moderately soft and firm PU elastic foam base, and a zoned texture design that balances breathability and slip resistance. It provides a comfortable and non-slip feel even after prolonged wear and is suitable for various shoe styles. Attached Figure Description
[0022] Figure 1 Photograph of the perilla antibacterial insole of this invention. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0024] Example 1 A perilla-infused antibacterial insole, with a PU elastic foam bottom layer consisting of open-cell polyurethane foam with a density of 0.22 g / cm³. 3 The thickness is 3.0mm; the perilla antibacterial fiber web surface layer is woven from a mixture of four-groove polyester fiber, cotton fiber and viscose fiber in a mass ratio of 3:1:2, and its interior and surface are loaded with a perilla antibacterial composition, which consists of perilla extract, chitosan and tea polyphenols in a mass ratio of 2:0.3:1.
[0025] The preparation method of perilla antibacterial insoles includes the following steps: S1. Polyether polyol, isocyanate, foaming agent, cell opener and catalyst are mixed, stirred at a constant temperature of 48℃ to foam, injected into a mold and cooled to solidify, to obtain PU foam preform with a density of 0.22 g / cm³. 3 The thickness is 3.0mm; the blank is die-cut, and then hemispherical anti-slip bumps are pressed into the heel area using an embossing device, with a height of 0.5mm and a density of 35 bumps / cm³. 2 This yields a PU elastic foam base layer. S2. Mix four-groove polyester fiber, cotton fiber, and viscose fiber in a mass ratio of 3:1:2, and then combine them through a three-stage doubling process. Weave the yarn into a 1 / 2 twill web fabric using an air-jet loom, and then sterilize it with steam. Preparation of Perilla Antibacterial Finishing Solution: Perilla raw material was soaked in water for 40 min, boiled over high heat for 8 min, and then simmered over low heat for 25 min. The decoction was collected by filtration, and the residue was boiled twice. The decoctions were combined. The residue was extracted with 80% ethanol at low temperature, and the ethanol was recovered to obtain an alcohol extract. The decoction and alcohol extract were mixed to obtain the perilla stock solution. Chitosan and tea polyphenols were added to the perilla stock solution, stirred evenly, and then diluted with water to obtain the antibacterial finishing solution. The sterilized fiber web was immersed in an antibacterial finishing solution using a two-dip, two-roll process with a roll-off rate of 80%. It was then dried at 90°C and heat-set at 115°C for 6 minutes. The loading of the perilla antibacterial composition was 1.8% of the dry weight of the fiber web. S3. Apply water-based polyurethane adhesive to the upper surface of the PU elastic foam bottom layer, attach the perilla antibacterial fiber mesh surface layer to the adhesive surface, and complete the hot-pressing composite under the conditions of 75℃ and 0.35MPa for 20s to obtain the perilla antibacterial insole.
[0026] Example 2 A perilla-infused antibacterial insole, with a PU elastic foam bottom layer consisting of open-cell polyurethane foam with a density of 0.18 g / cm³. 3 The thickness is 2.5mm; the perilla antibacterial fiber web surface layer is woven from a mixture of four-groove polyester fiber, cotton fiber and viscose fiber in a mass ratio of 2:1:1.5, and its interior and surface are loaded with a perilla antibacterial composition, which consists of perilla extract, chitosan and tea polyphenols in a mass ratio of 1:0.1:0.5.
[0027] The preparation method of perilla antibacterial insoles includes the following steps: S1. Polyether polyol, isocyanate, foaming agent, cell opener and catalyst are mixed, stirred and foamed at a constant temperature of 48℃, poured into a mold and cooled to set, to obtain PU foam preform with a density of 0.18 g / cm³. 3 The thickness is 2.5mm; the blank is die-cut, and then hemispherical anti-slip bumps are pressed into the heel area using an embossing device, with a height of 0.5mm and a density of 35 bumps / cm³. 2 This yields a PU elastic foam base layer. S2. Four-groove polyester fiber, cotton fiber, and viscose fiber are mixed in a mass ratio of 2:1:1.5, and then yarn is folded through a three-stage folding process. The yarn is then woven into a 1 / 2 twill web fabric using an air-jet loom, and then steam sterilized. Preparation of Perilla Antibacterial Finishing Solution: Perilla raw material was soaked in water for 40 min, boiled over high heat for 8 min, and then simmered over low heat for 25 min. The decoction was collected by filtration, and the residue was boiled twice. The decoctions were combined. The residue was extracted with 80% ethanol at low temperature, and the ethanol was recovered to obtain an alcohol extract. The decoction and alcohol extract were mixed to obtain the perilla stock solution. Chitosan and tea polyphenols were added to the perilla stock solution, stirred evenly, and then diluted with water to obtain the antibacterial finishing solution. The sterilized fiber web was immersed in an antibacterial finishing solution using a two-dip, two-roll process with a roll-off rate of 80%. It was then dried at 90°C and heat-set at 115°C for 6 minutes. The loading of the perilla antibacterial composition was 0.8% of the dry weight of the fiber web. S3. Apply water-based polyurethane adhesive to the upper surface of the PU elastic foam bottom layer, attach the perilla antibacterial fiber mesh surface layer to the adhesive surface, and complete the hot-pressing composite under the conditions of 75℃ and 0.35MPa for 20s to obtain the perilla antibacterial insole.
[0028] Example 3 A perilla-infused antibacterial insole, with a PU elastic foam bottom layer consisting of open-cell polyurethane foam with a density of 0.28 g / cm³. 3 The thickness is 3.5mm; the perilla antibacterial fiber web surface layer is woven from a mixture of four-groove polyester fiber, cotton fiber and viscose fiber in a mass ratio of 4:1:3, and its interior and surface are loaded with a perilla antibacterial composition, which consists of perilla extract, chitosan and tea polyphenols in a mass ratio of 3:0.5:2.
[0029] The preparation method of perilla antibacterial insoles includes the following steps: S1. Polyether polyol, isocyanate, foaming agent, cell opener and catalyst are mixed, stirred and foamed at a constant temperature of 48℃, poured into a mold and cooled to solidify, to obtain PU foam preform with a density of 0.28 g / cm³. 3 The thickness is 3.5mm; the blank is die-cut, and then hemispherical anti-slip bumps are pressed into the heel area using an embossing device, with a height of 0.5mm and a density of 35 bumps / cm³. 2 This yields a PU elastic foam base layer. S2. Four-groove polyester fiber, cotton fiber, and viscose fiber are mixed in a mass ratio of 4:1:3, and then plied together through a three-stage merging process. The resulting fabric is woven into a 1 / 2 twill web using an air-jet loom, and then steam sterilized. Preparation of Perilla Antibacterial Finishing Solution: Soak perilla raw materials in water for 40 minutes, boil over high heat for 8 minutes, then simmer over low heat for 25 minutes. Filter and collect the decoction. Repeat the decoction twice with the dregs, and combine the decoctions. Extract the dregs with 80% ethanol at low temperature, and recover the ethanol to obtain an alcohol extract. Mix the decoction and alcohol extract to obtain perilla stock solution. Add chitosan and tea polyphenols to the perilla stock solution, stir well, and then dilute with water to obtain the antibacterial finishing solution. The disinfected fiber web was immersed in an antibacterial finishing solution using a two-dip, two-roll process with a roll-off rate of 80%. It was then dried at 90°C and heat-set at 115°C for 6 minutes. The loading of the perilla antibacterial composition was 2.5% of the dry weight of the fiber web. S3. Apply water-based polyurethane adhesive to the upper surface of the PU elastic foam bottom layer, attach the perilla antibacterial fiber mesh surface layer to the adhesive surface, and complete the hot-pressing composite under the conditions of 75℃ and 0.35MPa for 20s to obtain the perilla antibacterial insole.
[0030] Comparative Example 1 An antibacterial insole, the bottom layer of which is an open-cell polyurethane foam with a density of 0.22 g / cm³. 3 The thickness is 3.0 mm; the antibacterial fiber web surface layer is woven from a mixture of four-groove polyester fiber, cotton fiber and viscose fiber in a mass ratio of 3:1:2, and its interior and surface are loaded with an antibacterial composition, which consists of chitosan and tea polyphenols in a mass ratio of 0.3:1.
[0031] Comparative Example 2 A perilla-infused antibacterial insole, with a PU elastic foam bottom layer consisting of open-cell polyurethane foam with a density of 0.22 g / cm³. 3 The thickness is 3.0mm; the perilla antibacterial fiber mesh surface layer is woven from a mixture of four-groove polyester fiber, cotton fiber and viscose fiber in a mass ratio of 3:1:2, and its interior and surface are loaded with perilla extract.
[0032] Comparative Example 3 An antibacterial insole, the bottom layer of which is an open-cell polyurethane foam with a density of 0.22 g / cm³. 3 It has a thickness of 3.0mm; the surface layer is made of ordinary cotton and has not been treated with antibacterial agents. Effect Example The performance of the insoles prepared in Examples 1-3 and Comparative Examples 1-3 was tested.
[0033] The results are shown in Table 1, referring to the FZ / T 01021-1992 standard for testing the antibacterial properties of fabrics.
[0034] Table 1 Antibacterial performance test
[0035] As shown in Table 1, the inhibition rates of Examples 1-3 against the three common foot pathogens are all ≥95%, which is better than that of Comparative Examples 1-3, indicating that the perilla antibacterial insoles prepared in Examples 1-3 have excellent antibacterial properties.
[0036] The ammonia reduction rate was tested according to GB / T 33610.2-2017 Determination of deodorizing properties of textiles - Part 2: Detection tube method. The results are shown in Table 2. Table 2 Odor Deodorization Performance Test
[0037] As shown in Table 2, Examples 1-3 exhibited excellent deodorization performance and washability. Comparative Example 1 showed poor deodorization effect, Comparative Example 2 had acceptable initial deodorization but significant degradation after washing, and Comparative Example 3 had virtually no deodorization effect.
[0038] The air permeability of textile fabrics was tested according to GB / T 5453-1997, and the results are shown in Table 3.
[0039] Table 3. Air permeability test
[0040] As shown in Table 3, the perilla antibacterial insole of the present invention has excellent breathability.
[0041] In summary, the perilla antibacterial insoles prepared in Examples 1-3 of this invention are superior to the comparative examples in terms of antibacterial performance, deodorizing performance, and breathability. This invention loads an antibacterial composition formed by compounding perilla extract, chitosan, and tea polyphenols onto a four-groove polyester / cotton / viscose fiber blended mesh layer, and then composites it with a PU elastic foam bottom layer, resulting in a perilla antibacterial insole that combines highly effective antibacterial properties, long-lasting deodorizing effect, good breathability and cushioning, and washability.
[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A perilla antibacterial insole, characterized in that, It is formed by bonding and pressing a PU elastic foam bottom layer with a perilla antibacterial fiber mesh top layer; The bottom layer of the PU elastic foam is an open-cell polyurethane foam; The perilla antibacterial fiber web surface layer is woven from a mixture of four-channel polyester fiber, cotton fiber and viscose fiber, and its interior and surface are loaded with a perilla antibacterial composition.
2. The perilla antibacterial insole according to claim 1, characterized in that, The perilla antibacterial composition comprises perilla extract, chitosan, and tea polyphenols in a mass ratio of 1-3:0.1-0.5:0.5-2. The perilla extract is prepared by water decoction and low-temperature ethanol extraction, and its active ingredients are perillaldehyde and perillyl alcohol. The loading of the perilla antibacterial composition is 0.5-3.0% of the dry weight of the perilla antibacterial fiber web surface layer.
3. The perilla antibacterial insole according to claim 1, characterized in that, The mass ratio of the four-channel polyester fiber, cotton fiber and viscose fiber is 2-4:1:1.5-3; the perilla antibacterial fiber web surface layer is woven with a 1 / 2 twill weave.
4. The perilla antibacterial insole according to claim 1, characterized in that, The heel anti-slip area of the PU elastic foam bottom layer is integrally formed with hemispherical anti-slip bumps, the height of which is 0.3~0.8mm and the density is 20~50 bumps / cm².
5. The perilla antibacterial insole according to claim 1, characterized in that, The density of the open-cell polyurethane foam is 0.15–0.30 g / cm³. 3 The thickness is 2.0 to 4.0 mm.
6. A method for preparing a perilla antibacterial insole according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Preparation of PU elastic foam bottom layer: Polyether polyol, isocyanate, foaming agent, cell opener and catalyst are mixed and stirred at a constant temperature of 40-55℃ to foam. The mixture is then injected into a mold and cooled to solidify, resulting in PU foam blank. The blank is then die-cut and hemispherical anti-slip protrusions are pressed into the heel area using an embossing device for later use. S2. Preparation of the perilla antibacterial fiber mesh surface layer: Four-groove polyester fiber, cotton fiber, and viscose fiber are mixed and spun in a certain mass ratio and woven to obtain a fiber web fabric; the fiber web fabric is steam sterilized, and then impregnated, dried, and heat-set with an antibacterial finishing liquid to obtain the perilla antibacterial fiber web surface layer; S3. Hot-pressed composite: Adhesive is applied to the upper surface of the PU elastic foam bottom layer, and the perilla antibacterial fiber mesh surface layer is attached. The mixture is then sent into a hot press molding machine for hot pressing and lamination to obtain the perilla antibacterial insole.
7. The preparation method according to claim 6, characterized in that, In step S2, the yarn doubling process is performed using a three-stage doubling technique.
8. The preparation method according to claim 6, characterized in that, In step S2, the method for preparing the antibacterial finishing solution is as follows: the perilla raw material is soaked, decocted, filtered and the decoction is collected. The residue is extracted with ethanol and the extracts are combined. Then chitosan and tea polyphenols are added in sequence, stirred evenly and diluted with water to a total solid content of 1% to 5% to obtain the antibacterial finishing solution.
9. The preparation method according to claim 6, characterized in that, In step S2, the immersion rolling adopts a two-immersion two-roll process with a rolling yield of 70% to 90%.
10. The preparation method according to claim 6, characterized in that, In step S3, the process parameters for hot-pressing composite are: hot-pressing temperature of 60~90℃, pressure of 0.2~0.5MPa, and holding time of 10~30s.