Sandwich multifunctional sanitary insole and preparation method thereof

Abstract

The invention discloses a sandwich multifunctional sanitary insole and a preparation method thereof, and belongs to the technical field of functional insoles. The insole is of a three-layer structural design, the upper layer is made of dissolution-free modified composite ultra-short fibers, the outer layer is made of organic-inorganic hybrid microporous low-melting-point polymers, the inner layer is made of organic-inorganic hybrid hydrophilic polymers, interface separation is triggered through moisture permeation to generate high-voltage static electricity, and liquid is activated to release negative ions; the middle layer is a mixed layer of modified composite ultra-short fibers and water-absorbing wood pulp fibers, so that dynamic moisture absorption and moisture conduction are realized; the lower layer is hydrophobic hot air non-woven fabric, and the bottom of the lower layer is coated with anti-skid glue containing micro-nano mesoporous silicon oxide. The preparation method comprises the steps of material compounding, hot rolling forming, embossing treatment and glue coating. The problems that an existing insole is insufficient in antibacterial property, low in moisture absorption and conduction efficiency, prone to slipping, poor in air permeability and the like are solved, and the insole has the multifunctional characteristics of antibacterial property, moisture absorption, moisture conduction, skid resistance, negative ion release and the like.

Description

Technical Field

[0001] This invention relates to a sandwich-style multifunctional sanitary insole and its preparation method, belonging to the field of functional insole technology. Background Technology

[0002] With the accelerating pace of modern life and the increasing awareness of health, foot hygiene has gradually become a focus of public attention. According to relevant statistics, about 15% of the global population suffers from athlete's foot, odor, and other problems due to the damp environment inside shoes and the proliferation of bacteria. While disposable sanitary insoles on the market have gained widespread attention due to their convenience, they generally suffer from numerous technical defects: In terms of antibacterial performance, traditional insoles mainly rely on finishing antibacterial agents, which are prone to dissolving during use and have extremely poor long-term effectiveness, making it difficult to effectively inhibit bacterial growth and leading to frequent odor problems; in terms of moisture absorption and wicking, most use a simple hot-rolling process for wood pulp, which cannot quickly wick away moisture after absorbing it, resulting in a wet and uncomfortable feeling on the soles of the feet after a few hours of wear, greatly affecting wearing comfort; in terms of anti-slip design, the side in contact with the foot lacks a scientifically designed groove, and its moisture wicking is poor, making it particularly easy to slip when wearing barefoot, and the insole does not have a good fit with the shoe's insole, often slipping out during wear, causing embarrassment and inconvenience; in terms of breathability, the underlying adhesive coating process seals the pores, severely hindering the expulsion of moisture from the shoe, making the internal environment hot and humid. In existing technologies, such as the disposable sanitary insole disclosed in utility model patent CN201509714U, although it solves the sweat absorption problem to some extent, the adhesive-coated fixing layer at the bottom not only contaminates the shoe itself but also results in extremely poor breathability because it prevents sweat from entering the shoe. The disposable odor-absorbing insole containing zeolite disclosed in utility model patent CN220024301U, while improving odor absorption and removal performance by filling the layers with zeolite, often requires users to cut it according to the actual size and shape of the shoe to obtain an insole that matches the shoe size. This process causes the zeolite to fall off, contaminating the shoe and affecting its appearance. In summary, facing these problems of insufficient antibacterial properties, low moisture absorption and wicking efficiency, risk of slippage, and poor breathability, there is an urgent need to develop an integrated disposable sanitary insole solution that combines highly efficient antibacterial properties, dynamic moisture wicking, and slip resistance with breathability. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method for preparing a sandwich-style multifunctional sanitary insole, comprising the following steps:

[0004] (1) Preparation of non-leaching modified composite ultra-short fiber: Through the core-sheath composite spinning process, porous silica containing nano-oxides is added to the outer substrate, and nano-oxides modified with multiple hydroxyl groups are added to the inner substrate to form core-sheath structure fiber.

[0005] (2) Layered laying: The lower layer is hydrophobic hot air nonwoven fabric, the middle layer is a mixed fiber layer, the mixed fiber layer is a mixture of modified composite ultra-short fiber and water-absorbing wood pulp fiber in a mass ratio of (30-50):(50-70), and the upper layer is pure modified composite ultra-short fiber.

[0006] (3) Hot rolling: Controlling temperature, pressure and speed to composite the three-layer material into a base material;

[0007] (4) Texture treatment: Texture the upper surface to increase friction;

[0008] (5) Anti-slip adhesive coating: Apply adhesive containing micro-nano mesoporous silica to the bottom of the lower layer, and then cut it into shape after drying.

[0009] Preferably, in step (1):

[0010] The outer substrate is selected from at least one of polyethylene, polypropylene, and polylactic acid;

[0011] The inner substrate is selected from at least one of modified polyamide and modified ethylene glycol terephthalate copolyester;

[0012] The nano-oxides are zinc oxide or titanium oxide, and the porous silica has a particle size of 100-500 nm.

[0013] Preferably, the hydrophobic hot air nonwoven fabric is a polyethylene / polyester or polypropylene / polyester bicomponent material with a basis weight of 20-40 g / m². 2 .

[0014] Preferably, the hot rolling temperature is 120-160℃, the pressure is 5-10MPa, and the speed is 2-5m / min.

[0015] Preferably, the mass percentage of micro / nano-porous silica in the anti-slip adhesive is 0.1-0.5%.

[0016] Preferably, the texturing depth of the texturing process is 0.1-0.3 mm, and the texturing density is 5-10 lines / cm.

[0017] Preferably, the sheath to core mass ratio of the non-leaching modified composite short fiber is 1:1, the fiber diameter is 1.5-2.0D, and the cutting length is 3-8mm.

[0018] Preferably, the absorbent wood pulp fiber has a diameter of 2.0D and a cutting length of 5mm.

[0019] This invention also provides a sandwich multifunctional sanitary insole prepared according to the above method, comprising:

[0020] Top layer: Modified composite ultrashort fiber layer that triggers the release of negative ions;

[0021] Middle layer: A moisture-absorbing and wicking mixed fiber layer;

[0022] Bottom layer: Anti-slip and hydrophobic non-woven fabric layer.

[0023] Preferably, its antibacterial rate is ≥96%, its negative ion release is ≥360,000 / cm3, and its moisture wicking rate is 0.8-1.2mL / s.

[0024] The beneficial effects of this invention are:

[0025] Controllable release of negative ions: High-voltage electrostatic discharge is triggered by interface separation, eliminating the need for chemical post-treatment and achieving an antibacterial rate of ≥99%.

[0026] One-way moisture wicking: The three-layer material gradient design allows sweat to be quickly wicked from the top layer to the middle layer, keeping feet dry.

[0027] Anti-slip and breathable synergy: Micro-nano mesoporous silica gel water enhances bonding force, while porosity maintains breathability.

[0028] Environmentally friendly and non-leaching: The core fiber structure is stable, avoiding the leaching of chemical additives. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the sandwich-style multifunctional sanitary insole structure provided by the present invention;

[0030] Figure 2 The moisturizing effect curve of the product prepared in Example 1. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0033] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the experimental materials used in the following examples are all purchased from commercial channels.

[0034] Example 1

[0035] Steps and parameters:

[0036] Preparation of non-leaching modified composite ultrashort fibers:

[0037] Outer substrate: Low-density polyethylene (LDPE) with 0.1% by mass of nano-zinc oxide (ZnO) porous silica (particle size 300nm).

[0038] Inner layer substrate: ethylene terephthalate copolyester (PET) with 0.1% by mass of polyvinylpyrrolidone (PVP) modified nano-titanium oxide (TiO2).

[0039] Spinning process: twin-screw extrusion, temperature 180℃ for the outer layer and 200℃ for the inner layer, fiber diameter after stretching is 2.0D, cutting length is 5mm, and the mass ratio of the sheath to the core layer is 1:1.

[0040] Middle layer blended fibers:

[0041] Modified composite short fibers and absorbent wood pulp fibers are mixed in a 50:50 mass ratio. The fiber diameter is 2.0D and the cutting length is 5mm.

[0042] Layered laying:

[0043] Bottom layer: Polypropylene / polyester bicomponent hydrophobic hot air nonwoven fabric (28 g / m2).

[0044] Middle layer: 10 layers of mixed fibers are laid, with a total thickness of 0.5mm.

[0045] Top layer: Covered with 100% modified composite ultra-short fiber layer.

[0046] Hot rolling: Temperature 140℃, pressure 8MPa, speed 3m / min, to form a substrate with a weight of 250g / m2 and a thickness of 1mm.

[0047] Corrugated finish: Corrugation depth 0.2mm, density 8 lines / cm.

[0048] Anti-slip adhesive coating:

[0049] Add 0.1% by mass of 300nm mesoporous silica to the adhesive, apply 10g / m2, and dry at 80℃.

[0050] Example 2

[0051] Steps and parameters:

[0052] Preparation of modified fibers:

[0053] Outer substrate: polypropylene (PP) with 0.3% nano-ZnO porous silica (particle size 400nm).

[0054] Inner layer substrate: modified polyamide (PA6) with 0.3% PVP-modified nano-TiO2.

[0055] The spinning temperature is 190°C for the outer layer and 210°C for the inner layer, and the rest is the same as in Example 1.

[0056] Middle layer blended fiber: Modified composite fiber and wood pulp fiber are mixed at a ratio of 40:60.

[0057] Layered laying:

[0058] The bottom layer of non-woven fabric has a weight of 20g / m2, and the middle layer consists of 12 layers with a total thickness of 0.6mm.

[0059] Hot rolling parameters: temperature 150℃, pressure 7MPa, speed 4m / min, finished substrate with a weight of 200g / m2 and a thickness of 1.1mm.

[0060] Roughing parameters: Rough depth 0.15mm, density 6 lines / cm.

[0061] Adhesive coating: 0.15% mesoporous silica addition, 8g / m2 coating amount.

[0062] Example 3

[0063] Steps and parameters:

[0064] Preparation of modified fibers:

[0065] Outer substrate: polylactic acid (PLA) with 0.5% nano-ZnO porous silica (particle size 500nm).

[0066] Inner layer substrate: modified PET with 0.5% PVP-modified nano-TiO2.

[0067] The spinning temperature is 170℃ for the outer layer and 190℃ for the inner layer.

[0068] Middle layer blended fiber: Modified composite fiber and wood pulp fiber are mixed at a ratio of 30:70.

[0069] Layered laying:

[0070] The weight of the lower nonwoven fabric is 40 g / m². 2 The middle layer consists of 8 layers with a total thickness of 0.4mm.

[0071] Hot rolling parameters: temperature 160℃, pressure 10MPa, speed 2m / min, finished substrate with a weight of 300g / m2 and a thickness of 0.8mm.

[0072] Roughing parameters: Rough depth 0.3mm, density 10 lines / cm.

[0073] Adhesive coating: 0.15% mesoporous silica addition, coating amount 12g / m2.

[0074] Comparative Example 1 (without modified fiber layer)

[0075] Steps and parameters:

[0076] Preparation of non-leaching modified composite ultrashort fibers:

[0077] Outer substrate: replaced with ordinary polyethylene fiber (without nano oxide loading), without the addition of nano zinc oxide (ZnO) porous silica.

[0078] Inner layer substrate: replaced with ordinary polyethylene fiber (without nano-oxide loading), without the addition of polyvinylpyrrolidone (PVP) modified nano-titanium oxide (TiO2).

[0079] Spinning process: twin-screw extrusion, temperature, fiber diameter after stretching (2.0D), cutting length (5mm), and sheath to core mass ratio (1:1) are all consistent with those in Example 1.

[0080] Middle layer blended fibers:

[0081] Modified composite short fibers and absorbent wood pulp fibers were mixed in a 50:50 mass ratio (Note: the modified composite short fibers here have been replaced with ordinary polyethylene fibers, without nano-oxide loading), and the fiber diameter was 2.0D and the cutting length was 5mm.

[0082] Layered laying:

[0083] Bottom layer: Polypropylene / polyester bicomponent hydrophobic hot air nonwoven fabric (28 g / m²) 2 ).

[0084] Middle layer: 10 layers of mixed fiber (including ordinary polyethylene fiber and wood pulp fiber) are laid, with a total thickness of 0.5mm.

[0085] Top layer: Covered with 100% ordinary polyethylene fiber layer (without nano-oxide loading), replacing the modified composite ultra-short fiber layer in Example 1.

[0086] Hot rolling:

[0087] Temperature 140℃, pressure 8MPa, speed 3m / min, to produce a substrate with a weight of 250g / m2 and a thickness of 1mm.

[0088] Textured finish:

[0089] Texture depth 0.2mm, density 8 lines / cm.

[0090] Anti-slip adhesive coating:

[0091] Add 0.1% by mass of 300nm mesoporous silica (consistent with Example 1) to the adhesive, apply 10g / m2, and dry at 80°C.

[0092] Comparative Example 2 (Middle Layer Pure Wood Pulp Fiber)

[0093] Steps and parameters:

[0094] Preparation of non-leaching modified composite ultrashort fibers:

[0095] Outer substrate: Low-density polyethylene (LDPE) with 0.1% by mass of nano-zinc oxide (ZnO) porous silica (particle size 300nm).

[0096] Inner layer substrate: ethylene terephthalate copolyester (PET) with 0.1% by mass of polyvinylpyrrolidone (PVP) modified nano-titanium oxide (TiO2).

[0097] Spinning process: twin-screw extrusion, temperature 180℃ for the outer layer and 200℃ for the inner layer, fiber diameter after stretching is 2.0D, cutting length is 5mm, and the mass ratio of the sheath to the core layer is 1:1.

[0098] Middle layer blended fibers:

[0099] Only absorbent wood pulp fibers (unmodified composite short fiber blend) are used, with a fiber diameter of 2.0D and a cutting length of 5mm. The 50:50 mass ratio mixing step is eliminated.

[0100] Layered laying:

[0101] Bottom layer: Polypropylene / polyester bicomponent hydrophobic hot air nonwoven fabric (28 g / m2).

[0102] Middle layer: 10 layers of pure absorbent wood pulp fiber with a total thickness of 0.5 mm are laid, replacing the mixed fiber layer in Example 1.

[0103] Top layer: Covered with 100% modified composite ultra-short fiber layer.

[0104] Hot rolling:

[0105] Temperature 140℃, pressure 8MPa, speed 3m / min, to produce a substrate with a weight of 250g / m2 and a thickness of 1mm.

[0106] Textured finish:

[0107] Texture depth 0.2mm, density 8 lines / cm.

[0108] Anti-slip adhesive coating:

[0109] Add 0.1% by mass of 300nm mesoporous silica to the adhesive, apply 10g / m2, and dry at 80℃.

[0110] Comparative Example 3 (Mesoporous Silica Gel Water)

[0111] Steps and parameters:

[0112] Preparation of non-leaching modified composite ultrashort fibers:

[0113] Outer substrate: Low-density polyethylene (LDPE) with 0.1% by mass of nano-zinc oxide (ZnO) porous silica (particle size 300nm).

[0114] Inner layer substrate: ethylene terephthalate copolyester (PET) with 0.1% by mass of polyvinylpyrrolidone (PVP) modified nano-titanium oxide (TiO2).

[0115] Spinning process: twin-screw extrusion, temperature 180℃ for the outer layer and 200℃ for the inner layer, fiber diameter after stretching is 2.0D, cutting length is 5mm, and the mass ratio of the sheath to the core layer is 1:1.

[0116] Middle layer blended fibers:

[0117] Modified composite short fibers and absorbent wood pulp fibers are mixed in a 50:50 mass ratio. The fiber diameter is 2.0D and the cutting length is 5mm.

[0118] Layered laying:

[0119] Bottom layer: Polypropylene / polyester bicomponent hydrophobic hot air nonwoven fabric (28 g / m2).

[0120] Middle layer: 10 layers of mixed fibers are laid, with a total thickness of 0.5mm.

[0121] Top layer: Covered with 100% modified composite ultra-short fiber layer.

[0122] Hot rolling:

[0123] Temperature 140℃, pressure 8MPa, speed 3m / min, to produce a substrate with a weight of 250g / m2 and a thickness of 1mm.

[0124] Textured finish:

[0125] Texture depth 0.2mm, density 8 lines / cm.

[0126] Anti-slip adhesive coating:

[0127] The anti-slip adhesive does not contain mesoporous silica, but only uses ordinary adhesive (the specific composition is the basic adhesive formula in Example 1, with 0.1% by mass of 300nm mesoporous silica removed), with a coating amount of 10g / m2 and a drying temperature of 80℃.

[0128] The products obtained from all the above embodiments and comparative examples were tested according to the methods in Table 1, and the results are shown in Table 2.

[0129] Table 1 Detection Methods

[0130]

[0131] Table 2 Detection Results

[0132]

[0133] Examples 1-3 all showed antibacterial rates ≥99% and negative ion release ≥320,000 / cm³. 3 The results were significantly higher than those of Comparative Example 1 (lacking modified fibers) and Comparative Example 2 (without mixed fibers in the middle layer). The core-sheath structure of the modified fibers triggered electrostatic discharge through interfacial separation, releasing negative ions and inhibiting bacterial growth, while Comparative Example 1, lacking nano-oxide loading, lost its antibacterial ability. The moisture wicking rate of Example 1 reached 1.2 mL / s, while that of Comparative Example 2 (pure wood pulp middle layer) was only 0.6 mL / s. The hydrophilicity of the modified composite ultra-short fibers in the mixed fibers synergistically with the hygroscopicity of the wood pulp fibers, forming a gradient moisture wicking channel. Example 1 had an anti-slip force of 8.5 N and a breathability of 120 mm / s, while the anti-slip force of Comparative Example 3 (without mesoporous silica) plummeted to 3.2 N, while the breathability remained unchanged. Mesoporous silica formed a microstructure in the adhesive to anchor the sole, while its pores maintained breathability. Example 1 was abrasion resistant for 5000 cycles, while Comparative Example 1 (ordinary fibers) only lasted for 3000 cycles. The outer layer of the modified fibers was formed by hot rolling with a low-melting-point polymer to create a dense protective layer. This invention resolves the inherent contradiction between moisture wicking and breathability in traditional insoles through a layered structure and synergistic material composition (moisture wicking-moisture absorption-hydrophobicity). A directional loading process using modified fibers (with the addition of nano-oxides through channels) achieves non-leaching antibacterial properties and negative ion release. The use of mesoporous silica anti-slip adhesive balances both slip resistance and breathability.

[0134] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0135] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a sandwich-style multifunctional sanitary insole, characterized in that, Includes the following steps: (1) Preparation of non-leaching modified composite ultra-short fiber: Through the core-sheath composite spinning process, porous silica containing nano-oxides is added to the outer substrate, and nano-oxides modified with multiple hydroxyl groups are added to the inner substrate to form core-sheath structure fiber. (2) Layered laying: The lower layer is hydrophobic hot air nonwoven fabric, the middle layer is a mixed fiber layer, and the upper layer is pure modified composite ultra-short fiber; (3) Hot rolling: Controlling temperature, pressure and speed to composite the three-layer material into a base material; (4) Texture treatment: Texture the upper surface to increase friction; (5) Anti-slip adhesive coating: Apply adhesive containing micro-nano mesoporous silica to the bottom of the lower layer, and then cut it into shape after drying.

2. The method according to claim 1, characterized in that, In step (1): The outer substrate is selected from at least one of polyethylene, polypropylene, and polylactic acid; The inner substrate is selected from at least one of modified polyamide and modified ethylene glycol terephthalate copolyester; The nano-oxides are zinc oxide or titanium oxide, and the porous silica has a particle size of 100-500 nm.

3. The method according to claim 1, characterized in that, The hydrophobic hot air nonwoven fabric is a two-component material of polyethylene / polyester or polypropylene / polyester, with a basis weight of 20-40 g / m2.

4. The method according to claim 1, characterized in that, The hot rolling temperature is 120-160℃, the pressure is 5-10MPa, and the speed is 2-5m / min.

5. The method according to claim 1, characterized in that, The anti-slip adhesive contains 0.1-0.5% by mass of micro-nano mesoporous silica.

6. The method according to claim 1, characterized in that, The groove depth of the embossing process is 0.1-0.3 mm, and the groove density is 5-10 grooves / cm.

7. The method according to claim 1, characterized in that, The non-leaching modified composite ultrashort fiber has a sheath to core mass ratio of 1:1, a fiber diameter of 1.5-2.0D, and a cutting length of 3-8mm.

8. The method according to claim 1, characterized in that, The absorbent wood pulp fibers have a diameter of 1.5-2.0D and a cutting length of 3-8mm.

9. A sandwich-style multifunctional sanitary insole prepared according to any one of claims 1-8, characterized in that, include: Top layer: Modified composite ultrashort fiber layer that triggers the release of negative ions; Middle layer: A moisture-absorbing and wicking mixed fiber layer; Bottom layer: Anti-slip and hydrophobic non-woven fabric layer.

10. The insole according to claim 9, characterized in that, Its antibacterial rate is ≥96%, and its negative ion release is ≥360,000 / cm³. 3 The moisture conduction rate is 0.8-1.2 mL / s.

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