Breathable cool shoe and preparation method thereof

Abstract

The invention relates to the technical field of shoe processing, in particular to a breathable cool shoe and a preparation method thereof.The breathable cool shoe comprises a vamp, a sole and an insole and is characterized in that the vamp is made of breathable mesh cloth materials, the sole is made of wear-resistant rubber materials, and the insole comprises an insole body and a cool coating attached to the upper surface of the insole body; the insole body is prepared from the following raw materials in parts by weight: polyurethane elastomer, mica powder, a foaming agent, an organic silicone oil surfactant, an antibacterial agent, carbon nanotubes and a toughening agent; the heat dissipation coating is prepared from the following raw materials in parts by weight: waterborne polyurethane adhesive, a cross-linking agent, xylitol, peppermint oil and water, the insole has a good heat dissipation effect and breathability, is good in cool feeling, has relatively good elasticity and strength, can be used for a long time without deformation, can still keep the cool feeling and the heat dissipation effect, is prepared into a shoe together with a vamp and a sole, and has a good heat dissipation effect. The breathable cool shoe can be obtained, and the comfort of wearing the shoe in summer can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of shoe processing, and more specifically, to a breathable and cool shoe and a preparation method thereof. Background Art

[0002] In the summer, people are generally more active, and their feet constantly move inside their shoes, generating heat. Sweat evaporates more slowly, causing heat and moisture to accumulate inside the shoes, creating a stuffy feeling. Furthermore, increased activity increases the secretion of sweat glands on the soles of the feet, creating a humid environment that fosters the growth of bacteria and fungi, leading to foot odor. To address the problem of stuffy and smelly shoes in the summer, vents are designed on the insoles to increase air flow and dissipate heat.

[0003] By setting vents on the insoles, only a small amount of heat can be taken away. In hot summer weather, the vents alone may not be able to meet the sufficient heat dissipation needs and cannot bring a comfortable cool feeling. Some insoles are made of fiber materials with cooling function. Cooling fibers can emit cold elements through special fiber minerals and surface specialization and groove design, bringing a combined effect of coolness and dryness, making the feet feel more comfortable when worn in summer. For example, mica fiber is used to prepare fabrics attached to the surface of the insole. Mica fiber has high thermal conductivity and high water absorption, can quickly absorb and conduct heat, form a hydration film, and bring a good cool feeling. However, in the spinning process, the introduction of mica particles will increase the difficulty of spinning, thereby increasing the preparation cost of mica fiber. In addition, mica fiber has poor strength and elasticity, and a short service life. Once damaged, the cooling effect will be greatly reduced, which limits the use of mica fiber in insoles. Summary of the Invention

[0004] In order to solve the problems of poor strength and elasticity of mica fiber and high preparation cost, which limit its application in insoles, the present application provides a breathable and cool shoe and a preparation method thereof.

[0005] In a first aspect, the present application provides a breathable and cool shoe, which adopts the following technical solution: A breathable and cool shoe comprises an upper, a sole, and an insole. The upper is made of a breathable mesh material, the sole is made of a wear-resistant rubber material, and the insole comprises an insole body and a heat dissipation coating attached to the upper surface of the insole body. The insole body is prepared from the following raw materials in parts by weight: 20-30 parts polyurethane elastomer 30-40 parts mica powder 3-4 parts foaming agent 4-6 parts of silicone oil surfactant 1-2 parts antibacterial agent 5-8 parts of carbon nanotubes 4-6 parts of toughening agent; The heat dissipation coating is prepared from the following raw materials in parts by weight: 15-25 parts water-based polyurethane adhesive 1-2 parts crosslinking agent 2-4 parts of xylitol 4-8 parts peppermint oil 30-40 parts water.

[0006] By adopting the above technical solution, the prepared insole has good heat dissipation effect and air permeability, good cooling feeling, good elasticity and strength, can be used for a long time without deformation, and the cooling feeling and heat dissipation effect can still be maintained. When prepared into shoes with the upper and sole, breathable and cooling shoes can be obtained, which is conducive to improving the comfort of wearing shoes in summer.

[0007] The insole in this application is made up of an insole body and a heat dissipation coating attached to the upper surface of the insole body. The cooling coating ensures that the shoe feels noticeably cool when put on, ensuring comfort. The insole body ensures that the heat generated during the wearing of the shoe can be quickly absorbed, bringing a lasting sense of coolness. At the same time, the insole body has good elasticity and strength, provides good support for the sole of the foot, ensures comfortable wearing, and ensures that it does not deform or reduce the cooling effect after long-term use. The insole body and the cooling coating work together to ensure that the insole has a good cooling effect and heat dissipation effect, while ensuring that the insole can be used for a long time without deformation.

[0008] The amount of mica powder used in this application is essentially the same as that used for the polyurethane thermoelastomer. Too much mica powder can cause the insole to become brittle and lose its elasticity. Therefore, by adding silicone surfactants, carbon nanotubes, and a toughening agent, this application makes the insole less susceptible to deformation and breakage when subjected to external forces, friction, and repeated use, thereby ensuring the long-term stability of the insole's performance and effects and extending its service life.

[0009] Preferably, the mica powder is modified mica powder, which is prepared by the following method: 1) calcining mica powder at 400-450° C. for 2-3 hours to obtain calcined mica powder; 2) mixing a silane coupling agent, anhydrous ethanol, and water in a mass ratio of (5-10): (20-25): 8 to obtain a mixed solution, then mixing the mixed solution with the calcined mica powder, and uniformly dispersing the mixture by ultrasonication at 40-60° C. for 1-2 hours. During the ultrasonication process, gradually adding an acidic solution until the pH of the mixed solution reaches 4-5, and then stopping the addition. 3) After the ultrasonication is completed, filtering, collecting the filter residue, and drying to obtain the modified mica powder.

[0010] By adopting this technical solution, the strength and elasticity of the insole itself are further enhanced. Surface modification of the mica powder with a silane coupling agent creates excellent compatibility with the polyurethane elastomer. The modified mica powder is more dispersible within the insole material, increasing the interfacial bonding strength with the polyurethane elastomer, thereby enhancing the elasticity and strength of the insole itself and ensuring it retains deformation during use. This allows the insole to effectively reduce foot temperature and provide a lasting sense of coolness during summer wear.

[0011] Preferably, the average particle size of the mica powder is 5-10 microns.

[0012] By employing this technical solution and optimizing the average particle size of the mica powder, a denser thermal conductivity network is formed within the insole, rapidly transferring heat from the sole of the foot to the insole surface. This enhances the insole's heat dissipation and keeps feet cooler and more comfortable during summer wear. Furthermore, the 5-10 micron mica powder particles within the insole body better integrate with other ingredients, enhancing its strength and toughness. The fine particles can fill the tiny pores of the insole material, making the insole structure denser, improving its resistance to pressure and impact, and extending its service life.

[0013] Preferably, the polyurethane elastomer is composed of polyurethane elastomer A and polyurethane elastomer B in a weight ratio of 1:(3-5); The hardness of polyurethane elastomer A is 80-90D; The hardness of the polyurethane elastomer B is 10-30D.

[0014] By adopting the above technical solution and optimizing the type and amount of polyurethane elastomer, it is possible to ensure that the insole itself is supportive while also having good softness and elasticity, meeting the comfort and support needs of different parts of the body. The hardness of polyurethane elastomer A is 80-90D, which is in the higher hardness range. It can provide good support performance for the insole, making the insole less likely to deform during use, maintaining a stable shape and structure, and providing strong support for the foot. The hardness of polyurethane elastomer B is 10-30D, which is in the lower hardness range. It has good flexibility and elasticity, which can make the insole better fit the curve of the sole of the foot and increase wearing comfort.

[0015] Preferably, the average diameter of the carbon nanotubes is 30-60 nm.

[0016] By adopting the above technical solution, adding carbon nanotubes with an average diameter of 30-60nm to the insole can enhance the strength of the insole, making it less susceptible to deformation and damage when subjected to external forces, friction, and repeated use, thereby extending the service life of the insole. At the same time, this material can synergize with other thermally conductive materials such as mica powder to form an efficient thermal conductivity network. When heat is generated in the sole of the foot, the carbon nanotubes can quickly conduct the heat to the surface of the insole, and then dissipate it through the breathable structure of the upper, thereby enhancing the heat dissipation effect of the insole and keeping the foot cooler and more comfortable when worn in the summer.

[0017] Preferably, the toughening agent is composed of ethylene-acrylic acid copolymer and methyl methacrylate-butadiene-styrene copolymer in a weight ratio of (3-5):3.

[0018] By adopting the above technical solution and optimizing the type and amount of plasticizers, the flexibility and elasticity of the insole itself are further improved. The combination of the flexibility of the ethylene-acrylic acid copolymer and the rubbery elasticity of the methyl methacrylate-butadiene-styrene copolymer allows the insole to maintain a certain degree of elastic deformation when subjected to external forces, while also providing a certain degree of support through the hard shell structure of the methyl methacrylate-butadiene-styrene copolymer. This ensures the insole's softness while improving its overall toughness and impact resistance.

[0019] Preferably, the organic silicone oil surfactant includes at least one of polydimethylsiloxane, amino-modified silicone oil, polyether-modified silicone oil and amino silicone oil.

[0020] By employing this technical solution and optimizing the type of silicone surfactant, the insole itself can be made softer, conforming to the curves of the foot and improving wearing comfort. Furthermore, when combined with other materials such as mica powder and carbon nanotubes, the insole's heat absorption is further enhanced, ensuring a cool feeling when wearing the shoes.

[0021] Preferably, the foaming agent is at least one of AC foaming agent, CO2, N2, n-butane, n-pentane or isopentane.

[0022] By adopting the above technical solution and optimizing the type of foaming agent, the insole body can be uniformly distributed with pores, increasing its breathability and allowing heat and sweat from the foot to escape more quickly, reducing the feeling of stuffiness. At the same time, the insole body has excellent elasticity and shock absorption properties. When the foot is impacted, the pores absorb and disperse the impact force, reducing fatigue and discomfort, and providing better protection for the foot.

[0023] Preferably, the thickness of the cooling coating is 0.05-0.1 mm.

[0024] By employing this technical solution, the thickness of the cooling coating is optimized, enabling it to quickly respond to foot heat, providing the wearer with a noticeable cooling effect the moment the insole contacts the wearer. Furthermore, the cooling coating's thinness prevents obstruction of the insole's internal ventilation pores. The micropores within the insole itself maintain excellent breathability, allowing heat and sweat from the foot to escape smoothly, reducing the feeling of stuffiness. Furthermore, the coating's even distribution and appropriate thickness prevent it from peeling or damaging over extended use.

[0025] In a second aspect, the present application provides a method for preparing breathable and cool shoes, which adopts the following technical solution: A method for preparing breathable and cool shoes comprises the following steps: S1, mixing polyurethane elastomer, mica powder, foaming agent, silicone oil surfactant, antibacterial agent, carbon nanotubes and toughening agent, then performing injection molding and trimming to obtain the insole body; S2, mixing water-based polyurethane glue, a cross-linking agent, xylitol, peppermint oil, and water to obtain a cool coating, and then applying the cool coating to the upper surface of the insole body and curing it to obtain an insole; S3, assembling the sole, the insole and the upper into shoes to obtain breathable and cool shoes.

[0026] By adopting the above technical solution, the obtained shoes have good air permeability and cooling effect. Among them, the upper is made of breathable mesh material, which can quickly discharge the heat and sweat in the shoe, reduce the accumulation of heat and moisture in the shoe, and effectively relieve the stuffy feeling of wearing shoes in summer. At the same time, the heat dissipation coating coated on the upper surface of the insole body contains cooling ingredients such as xylitol and peppermint oil. These ingredients can quickly bring a cool feeling when they come into contact with the soles of the feet, allowing the wearer to feel a comfortable cool feeling even in hot summer weather. The mica powder in the insole body has high thermal conductivity and high water absorption, which can quickly absorb and conduct heat from the soles of the feet, continuously emit cold elements, and further enhance the heat dissipation effect of the insole.

[0027] In summary, this application has the following beneficial effects: 1. Cooling and Excellent Heat Dissipation: The mica powder and carbon nanotubes in the insole have high thermal conductivity and water absorption, quickly absorbing and conducting heat generated by the foot, forming a hydration film for excellent heat dissipation. Ingredients such as xylitol and peppermint oil in the heat dissipation coating provide a noticeable cooling sensation upon contact, making feet more comfortable in summer.

[0028] 2. Good elasticity and strength: The addition of polyurethane elastomer and toughening agent gives the insole body good elasticity and strength. The addition of carbon nanotubes further improves the mechanical properties of the material, ensuring that the insole is not easily deformed during long-term use and can provide continuous and good support for the foot.

[0029] 3. High overall comfort: The synergistic effect of the insole and the heat dissipation coating provides an instantaneous cooling sensation while wearing the shoe, while ensuring coolness and comfort throughout the entire wear process. The rational combination of the upper, sole, and insole further enhances the overall comfort and durability of the shoe. DETAILED DESCRIPTION Example

[0030] Polydimethylsiloxane was purchased from Foshan Guirunbao Biotechnology Co., Ltd., model 07.

[0031] Amino silicone oil Jining Tangyi Chemical Co., Ltd., model number is JF-802A.

[0032] Polyether-modified siloxane was purchased from Guangzhou Tuoxin Chemical Technology Co., Ltd., model TEGOPREN 5840.

[0033] Ethylene-acrylic acid copolymer was purchased from Shanghai Geda International Trading Co., Ltd., model number 1330AC.

[0034] Methyl methacrylate-butadiene-styrene copolymer was purchased from Entec Polymers, product model: Methyl Methacrylate Butadiene Styrene.

[0035] Water-based polyurethane adhesive was purchased from Jining Tangyi Chemical Co., Ltd., model number 9021.

[0036] Example 1 A breathable and cool shoe is prepared by the following method: S1. Mix 200 g of polyurethane elastomer, 300 g of mica powder, 30 g of foaming agent (AC foaming agent), 40 g of silicone oil surfactant (polydimethylsiloxane), 10 g of antibacterial agent (silver-loaded titanium dioxide), 50 g of carbon nanotubes, and 40 g of toughening agent, then perform injection molding and trimming to obtain an insole body; S2, 150g of water-based polyurethane glue, 10g of cross-linking agent (nitropyridine cross-linking agent), 20g of xylitol, 40g of peppermint oil and 300g of water were mixed to obtain a cool coating, and the cool coating was applied to the upper surface of the insole body and cured to obtain an insole; S3, assembling the sole, the insole and the upper into shoes to obtain breathable and cool shoes.

[0037] The polyurethane elastomer is composed of polyurethane elastomer A and polyurethane elastomer B in a weight ratio of 1:3; The hardness of polyurethane elastomer A is 80D; The hardness of the polyurethane elastomer B is 10D.

[0038] The average particle size of mica powder is 5 microns.

[0039] The average diameter of carbon nanotubes is 30 nm.

[0040] The toughening agent is composed of ethylene-acrylic acid copolymer and methyl methacrylate-butadiene-styrene copolymer in a weight ratio of 3:3. The difference between Example 2-3 and Example 1 is that the types, amounts and parameters of the raw materials for preparing the breathable cool shoes are different. The specific differences are shown in Table 1: Example 4 A breathable and cool shoe. The difference between this embodiment and embodiment 1 is that the mica powder is modified mica powder, which is prepared by the following method: 1) calcining 200 g of mica powder at 400° C. for 2 h to obtain calcined mica powder; 2) A silane coupling agent (acetyltrimethoxysilane), anhydrous ethanol, and water were mixed in a mass ratio of 5:20:8 to obtain a mixed solution, and then the mixed solution was mixed with calcined mica powder. After being uniformly dispersed by ultrasonication at 40°C for 1 hour, an acidic solution (acetic acid solution) was gradually added dropwise during the ultrasonication process until the pH of the mixed solution reached 4. 3) After the ultrasonication is completed, filter, take the filter residue, and dry it to obtain modified mica powder.

[0041] Example 5 A breathable and cool shoe. The difference between this embodiment and embodiment 1 is that the mica powder is modified mica powder, which is prepared by the following method: 1) calcining 200 g of mica powder at 450° C. for 3 h to obtain calcined mica powder; 2) A silane coupling agent (γ-aminopropyltriethoxysilane), anhydrous ethanol, and water were mixed in a mass ratio of 10:25:8 to obtain a mixed solution, and then the mixed solution was mixed with calcined mica powder. After being uniformly dispersed by ultrasonication at 60°C for 2 hours, an acidic solution (acetic acid solution) was gradually added dropwise during the ultrasonication process until the pH of the mixed solution reached 5; 3) After the ultrasonication is completed, filter, take the filter residue, and dry it to obtain modified mica powder.

[0042] Example 6 A breathable and cool shoe. The difference between this embodiment and embodiment 1 is that the polyurethane elastomer has a hardness of 80D.

[0043] Example 7 A breathable and cool shoe. The difference between this embodiment and embodiment 1 is that the toughening agent is ethylene-acrylic acid copolymer.

[0044] Comparative Example Comparative Example 1 A breathable and cool shoe. The difference between this comparative example and Example 1 is that the cool coating is removed.

[0045] Comparative Example 2 A breathable and cool shoe. The difference between this comparative example and Example 1 is that the organic silicone oil surfactant is omitted.

[0046] Comparative Example 3 A breathable and cool shoe. The difference between this comparative example and Example 1 is that the carbon nanotubes are omitted.

[0047] Comparative Example 4 A breathable and cool shoe. The difference between this comparative example and Example 1 is that the amount of mica powder used is 500g.

[0048] Detection method / test method Thermal fugacity: refer to ASTM D7984 standard test method.

[0049] Rebound rate test: The vertical rebound rates of Examples 1-7 and Comparative Examples 1-3 were tested using ASTM D2632-2015 “Standard Test Methods for Rubber Properties—Determination of Rubber Elasticity by Vertical Rebound Method”.

[0050] Compressive strength: According to ISO 17708 standard. The test data is shown in Table 2: Table 2 Tests of thermal fugacity, rebound rate and compressive strength in Examples 1-7 and Comparative Examples 1-4 It can be seen from the experimental data of Example 1 and Comparative Example 1 that by coating the cool feeling coating prepared in the present application on the insole body, the instantaneous cool feeling of the shoes can be improved.

[0051] It can be seen from the experimental data of Example 1 and Comparative Examples 2-4 that the insoles prepared by the formula of the present application have good elasticity and compressive strength, which is beneficial to extending the service life of the shoes.

[0052] Heat dissipation, test steps: Prepare test subjects: Select four people with the same foot size, different heights, and different weights, who have no foot or leg injuries, no lower limb diseases, and normal walking posture within the year before the experiment. Prepare test equipment: use thermocouples and infrared detection equipment, and a treadmill with adjustable speed; Prepare the test environment: Test in an environment with a temperature of 21-25°C and a humidity of 45-55% RH; Testing process: The tester first stood barefoot for 10 minutes; The testers ran on the treadmill at different speeds: 3.0 km / h for 3 minutes, 4.0 km / h for 8 minutes, 6.0 km / h for 10 minutes, and 7.0 km / h for 9 minutes; During running, the temperature recorder records the temperature changes at each point on the sole of the foot every 0.5 seconds. Every 3 minutes, the machine is stopped and the thermal imager is used to record the temperature changes at the sole of the foot. The average temperature of the sole of the foot at each speed is calculated. The smaller the temperature rise during exercise, the better the heat dissipation effect.

[0053] Tests were performed on Examples 1 and 4 and Comparative Examples 2 and 3. The test results are shown in Table 3: Table 3 Experimental results of Examples 1, 4 and Comparative Examples 2, 3 It can be seen from the test results of Example 1 and Comparative Examples 2-3 that the insole prepared by the formula of the present application has a good heat dissipation effect.

[0054] It can be seen from the experimental results of Example 1 and Example 4 that the modified mica powder prepared by the present application can improve the heat dissipation effect of the insole.

[0055] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A breathable cool shoe, comprising an upper, a sole and an insole, characterized in that: The upper is made of a breathable mesh material, the sole is made of a wear-resistant rubber material, and the insole comprises an insole body and a cool coating attached to the upper surface of the insole body. The insole body is prepared from the following raw materials in parts by weight: 20-30 parts polyurethane elastomer 30-40 parts mica powder 3-4 parts foaming agent 4-6 parts of silicone oil surfactant 1-2 parts antibacterial agent 5-8 parts of carbon nanotubes 4-6 parts of toughening agent; The heat dissipation coating is prepared from the following raw materials in parts by weight: 15-25 parts water-based polyurethane adhesive 1-2 parts crosslinking agent 2-4 parts of xylitol 4-8 parts peppermint oil 30-40 parts water.

2. The breathable cool shoes according to claim 1, characterized in that: The mica powder is modified mica powder, which is prepared by the following method: 1) calcining mica powder at 400-450°C for 2-3 hours to obtain calcined mica powder; 2) a silane coupling agent, anhydrous ethanol, and water are mixed in a mass ratio of (5-10): (20-25): 8 to obtain a mixed solution, and then the mixed solution is mixed with the calcined mica powder. After uniform dispersion by ultrasonication at 40-60° C. for 1-2 hours, an acidic solution is gradually added dropwise during the ultrasonication process until the pH of the mixed solution reaches 4-5; 3) After the ultrasonic treatment, filter, take the filter residue, and dry it to obtain modified mica powder.

3. The breathable and cool shoe according to claim 2, characterized in that: The average particle size of the mica powder is 5-10 microns.

4. The breathable and cool shoe according to claim 1, characterized in that: The polyurethane elastomer is composed of polyurethane elastomer A and polyurethane elastomer B in a weight ratio of 1: (3-5); The hardness of polyurethane elastomer A is 80-90D; The hardness of the polyurethane elastomer B is 10-30D.

5. The breathable and cool shoe according to claim 1, characterized in that: The average diameter of the carbon nanotubes is 30-60 nm.

6. The breathable and cool shoe according to claim 1, characterized in that: The toughening agent is composed of ethylene-acrylic acid copolymer and methyl methacrylate-butadiene-styrene copolymer in a weight ratio of (3-5):

3.

7. The breathable and cool shoe according to claim 1, characterized in that: The organic silicone oil surfactant includes at least one of polydimethylsiloxane, amino-modified silicone oil, polyether-modified silicone oil and amino silicone oil.

8. The breathable and cool shoe according to claim 1, characterized in that: The foaming agent is at least one of AC foaming agent, CO2, N2, n-butane, n-pentane or isopentane.

9. The breathable and cool shoe according to claim 1, characterized in that: The thickness of the cooling coating is 0.05-0.1 mm.

10. A method for preparing the breathable cool shoes according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: S1, mixing polyurethane elastomer, mica powder, foaming agent, silicone oil surfactant, antibacterial agent, carbon nanotubes and toughening agent, then performing injection molding and trimming to obtain the insole body; S2, mixing water-based polyurethane glue, a cross-linking agent, xylitol, peppermint oil, and water to obtain a cool coating, and then applying the cool coating to the upper surface of the insole body and curing it to obtain an insole; S3, assembling the sole, the insole and the upper into shoes to obtain breathable and cool shoes.

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