Anti-vibration and vibration-absorption sports shoe sole based on robot material and preparation method of anti-vibration and vibration-absorption sports shoe sole

Abstract

The invention relates to the technical field of sneaker sole preparation, and discloses a robot material-based anti-vibration and vibration-absorption sneaker sole and a preparation method thereof.The sneaker sole is prepared from a zero-degree material through a foaming process, and the zero-degree material comprises an ethylene-vinyl acetate copolymer matrix and a functional modification component; the sneaker sole is provided with a shoe sole area and a heel area, the shoe sole area is provided with an anti-vibration supporting structure, and the heel area is provided with a vibration absorbing and cushioning structure; the anti-vibration supporting structure absorbs impact energy and rebounds to release energy after the shoe sole falls to the ground, and dynamic supporting is formed for the shoe sole. The shoe sole is divided into the shoe sole anti-vibration supporting area and the heel vibration absorbing and cushioning area, so that the function of the shoe sole is matched with the biomechanical characteristics that the foot sole is lifted preferentially and the heel falls to the ground finally when a human body walks, the shoe sole area absorbs impact energy at the falling moment and rebounds rapidly to release energy, dynamic propelling supporting is provided for the foot sole, and the shoe sole is protected. The heel area effectively absorbs and dissipates impact energy after landing, and the foot fatigue feeling is reduced.

Description

Technical Field

[0001] This invention relates to the field of sports shoe sole manufacturing technology, specifically to a vibration-damping sports shoe sole based on robotic materials and its manufacturing method. Background Technology

[0002] As a crucial interface between the foot and the ground, the sole of an athletic shoe directly impacts comfort, athletic performance, and foot health protection. Traditional sole materials primarily include natural rubber, synthetic rubber, ethylene-vinyl acetate copolymer, and polyurethane. Each of these materials possesses specific performance advantages. Natural and synthetic rubber offer excellent abrasion resistance and grip, but their high density results in heavier soles and limited rebound performance. Ethylene-vinyl acetate copolymer can significantly reduce density and achieve lightweighting through foaming processes, but the foamed material lacks sufficient support strength and is prone to permanent compression deformation over long-term use. While polyurethane offers excellent cushioning performance, its high cost and poor breathability make it difficult for any single material to simultaneously meet the multiple performance requirements of lightweighting, high rebound, compression resistance, and durable cushioning in a single sole. To address the aforementioned limitations, the footwear material industry has developed ethylene-vinyl acetate copolymer chemical foaming technology. By adding crosslinking agents, foaming agents, and functional additives, the material properties are optimized. This improvement enhances the material's resilience and compression performance. However, the foamed material still exhibits homogeneous characteristics and cannot achieve differentiated mechanical responses in different areas of the same sole. The use of materials with the same density and hardness in the forefoot and heel areas results in a lack of effective energy feedback support in the forefoot area and insufficient cushioning in the heel area.

[0003] In recent years, some technical solutions have attempted to achieve functional zoning through structural design, such as using different thicknesses or surface groove designs. These structural improvements have enhanced sole performance to some extent, but the homogeneity of the material itself remains unchanged. The anti-vibration support and shock absorption effects are still limited by the inherent properties of the material, making it impossible to precisely control the rapid rebound in the forefoot area and the slow energy dissipation in the heel area. Meanwhile, the robotics field has developed a zero-degree material formulation system. This system, through the synergistic compounding of an ethylene-vinyl acetate copolymer matrix with elastomers, toughening resins, and functional modification components, forms a material structure that combines a soft touch with mechanical strength. It exhibits elasticity, lightweight advantages, and skin-friendly properties. This material has demonstrated excellent dynamic response capabilities in robot joint protection and cushioning components. However, the robotic zero-degree material has never been used in footwear products, and the footwear industry has not yet realized the potential of this cross-disciplinary material in achieving anti-vibration and shock absorption functions in footwear soles. Current technologies fail to provide specific formulations for applying robotically measured materials to shoe sole manufacturing, and even more so, they lack foaming process parameters based on these materials and preparation methods for forming shock-absorbing and vibration-damping zones in the forefoot and heel. This prevents shoe soles from being functionally designed according to the gait characteristics of human walking, where the forefoot lifts first and the heel lands last. Consequently, it is difficult to achieve the technical effect of absorbing and releasing impact energy in the forefoot area and dissipating it in the heel area. Existing shoe soles still exhibit significant foot fatigue and low energy utilization efficiency during prolonged walking. Therefore, there is an urgent need to develop sports shoe soles based on robotically measured materials with shock-absorbing and vibration-damping zones, along with their corresponding preparation methods, to achieve cross-disciplinary material applications and breakthroughs in shoe sole performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a vibration-damping and shock-absorbing sports shoe sole based on robotic materials and its preparation method, thus solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vibration-damping and shock-absorbing sports shoe sole based on robotic materials. The sole is made of zero-degree material through a foaming process. The zero-degree material comprises an ethylene-vinyl acetate copolymer matrix and functional modified components. The sole has a forefoot area and a heel area. The forefoot area is equipped with a vibration-damping support structure, and the heel area is equipped with a shock-absorbing and cushioning structure. The vibration-damping support structure absorbs impact energy and rebounds to release energy after the forefoot lands, providing dynamic support to the foot. The shock-absorbing and cushioning structure absorbs and dissipates impact energy after the heel lands, reducing walking fatigue.

[0006] Preferably, the zero-degree material comprises the following components, by weight: 40-60 parts ethylene-vinyl acetate copolymer, 10-15 parts elastomer, 15-25 parts toughening resin, 10-15 parts compatibilizer, 5-10 parts lubricant, 5-10 parts wear-resistant agent, 0.5-1 part ST / E stabilizer, 1-2 parts zinc oxide, 1-2 parts dicumyl peroxide, 2-3 parts foaming agent, and 3-5 parts titanium dioxide.

[0007] Preferably, the physical properties of the zero-degree material after foaming meet the following requirements: resilience 60%, compression set 36%, hardness 43C, and density 0.12 g / cm³. 3 Yellowing resistance level 4, abrasion loss 11mm 3 .

[0008] Preferably, the outsole of the sports shoe is designed with differentiated functional areas according to the characteristics of human gait. The forefoot area corresponds to the toes to the front of the arch, and the heel area corresponds to the heel to the back of the arch. The material in the forefoot area recovers its deformation and generates an upward rebound force within 0.1-0.3 seconds after being compressed, and the rebound force is 60%-80% of the impact force. The material in the heel area slowly recovers its deformation within 0.5-1 seconds after being compressed, and the energy rebound rate is less than 30%.

[0009] A method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials, the method comprising the following steps: Granulation: Mix all components of the zero-degree material and put them into a granulator. Mix at 120°C for 15 minutes and then extrude and pelletize to obtain masterbatch. Color matching: Color masterbatch is prepared according to color requirements; Foaming: The color-adjusted masterbatch is put into a foaming machine and heated at 180°C for 8 minutes. At the same time, it is molded under 150 tons of molding pressure to obtain the shoe sole blank. Storage: Place the shoe sole blank at room temperature for 24 hours to mature, and then heat it again at 175-180℃ for 500 seconds; Molding: The stored and treated shoe sole blanks are cut, polished, and glued to make finished sports shoe soles.

[0010] Preferably, the screw speed of the granulator is controlled at 30-50 rpm, and the extruded strip is cut into pellets after water cooling, with the resulting masterbatch particle size controlled at 2-4 mm.

[0011] Preferably, the foaming process employs EVA chemical foaming technology or supercritical fluid foaming technology, and a release agent is sprayed onto the inner wall of the molding die. The release agent is a silicone oil or stearate.

[0012] Preferably, the storage process is divided into two stages: the first stage is to let it stand for 24 hours in an environment with a temperature of 20-25℃ and a humidity of 50%-60%; the second stage is to heat-treat in an oven at 175-180℃ for 500 seconds to fully cross-link the shoe sole blank and stabilize its size.

[0013] Preferably, the zero-degree material forms a closed-cell foam structure during the foaming process, with a cell diameter of 0.1-0.5 mm, a cell wall thickness of 0.01-0.03 mm, and a closed-cell rate of over 85%. The closed-cell foam structure gives the sports shoe sole a bouncy feel, lightweight characteristics, and skin-friendly cushioning performance.

[0014] Preferably, the prepared sports shoe sole is used in a gait pattern where the forefoot lifts first and the heel lands last during walking. The forefoot area provides anti-vibration support through the rapid compression and rebound of the closed-cell foam structure at the moment of landing, while the heel area provides shock absorption and cushioning through the slow compression and energy dissipation of the closed-cell foam structure after landing. The anti-vibration support and shock absorption and cushioning functions work together to reduce walking energy consumption and improve foot comfort.

[0015] This invention provides a vibration-damping and shock-absorbing sports shoe sole based on robotic materials and its preparation method. It has the following beneficial effects: 1. This invention divides the sole into a forefoot shock-absorbing and cushioning area and a heel shock-absorbing and cushioning area, so that the sole function matches the biomechanical characteristics of human walking, where the forefoot lifts first and the heel lands last. The forefoot area absorbs impact energy at the moment of landing and quickly rebounds and releases energy, providing dynamic propulsion support for the forefoot. The heel area effectively absorbs and dissipates impact energy after landing, reducing foot fatigue. The two functional areas work together to achieve dynamic energy management, significantly improving walking comfort and exercise efficiency.

[0016] 2. This invention uses robot zero-degree material as the sole substrate. Through the compounding and synergistic effect of ethylene-vinyl acetate copolymer matrix with elastomer, toughening resin, compatibilizer and functional modification components, a lightweight material system with closed-cell foam structure is formed, which gives the sole a Q-elastic touch and skin-friendly shock-absorbing properties. While ensuring sufficient support strength, it achieves a soft and fit wearing experience, breaking through the traditional sole material's problem of balancing rebound, compression, hardness and wear resistance.

[0017] 3. This invention uses a multi-stage process control, including granulation and mixing, high-temperature foaming, molding, and curing storage, to enable the zero-degree material to form a microstructure with uniform cell diameter, thin cell wall, and high closed-cell rate. This ensures that the physical properties of the shoe sole are stable and consistent. The secondary heat treatment process promotes full cross-linking of the material, improves dimensional stability and yellowing resistance, and ensures that the vibration damping function can be stably performed during long-term use, thus extending the service life of the shoe sole. Attached Figure Description

[0018] Figure 1 This is the overall flowchart of the present invention. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1 This invention provides a vibration-damping and shock-absorbing sports shoe sole based on robotic materials and its preparation method.

[0021] Example 1: Weigh 50 parts of ethylene-vinyl acetate copolymer, 12 parts of elastomer, 20 parts of toughening resin, 12 parts of compatibilizer, 7 parts of lubricant, 7 parts of wear-resistant agent, 0.8 parts of ST / E stabilizer, 1.5 parts of zinc oxide, 1.5 parts of dicumyl peroxide, 2.5 parts of foaming agent, and 4 parts of titanium dioxide. Place the above components in a high-speed mixer for premixing for 5 minutes, then feed them into a granulator. Set the screw speed to 40 rpm and knead at 120°C for 15 minutes. After extruding, the strips are cooled with water. The masterbatch is granulated to obtain 3mm particle size. Color masterbatch is added according to the color requirements. The color-matched masterbatch is put into a foaming machine and heated to 180℃ for 8 minutes using EVA chemical foaming process. At the same time, it is molded under 150 tons of molding pressure to obtain the sole blank. The sole blank is placed in an environment of 23℃ and 55% humidity for 24 hours to mature. Then it is transferred to a 178℃ oven for a second heating of 500 seconds. Finally, the finished sports shoe sole is made by cutting, grinding and bonding processes.

[0022] Example 2: Weigh 45 parts of ethylene-vinyl acetate copolymer, 15 parts of elastomer, 18 parts of toughening resin, 10 parts of compatibilizer, 8 parts of lubricant, 6 parts of abrasion resistant agent, 0.6 parts of ST / E stabilizer, 1.2 parts of zinc oxide, 1.8 parts of dicumyl peroxide, 2.2 parts of foaming agent, and 3.5 parts of titanium dioxide. After premixing the above components, feed them into a granulator and knead at 125°C for 12 minutes with a screw speed of 45 rpm. Extrude and pelletize to obtain masterbatch with a particle size of 2.5 mm. After color matching, use a supercritical fluid foaming process to heat and foam at 175°C for 9 minutes with a molding pressure of 140 tons to obtain shoe sole blank. After placing the shoe sole blank at room temperature for 26 hours, heat it again at 176°C for 480 seconds. Finally, it is molded into a finished sports shoe sole.

[0023] Example 3: Weigh 55 parts of ethylene-vinyl acetate copolymer, 10 parts of elastomer, 22 parts of toughening resin, 14 parts of compatibilizer, 6 parts of lubricant, 8 parts of abrasion resistant agent, 1 part of ST / E stabilizer, 1.8 parts of zinc oxide, 1.2 parts of dicumyl peroxide, 2.8 parts of foaming agent, and 4.5 parts of titanium dioxide. After premixing the above components, put them into a granulator and knead them at 118°C for 16 minutes with a screw speed of 35 rpm. Extrude and pelletize to obtain masterbatch with a particle size of 3.5 mm. After color matching, use EVA chemical foaming process to heat and foam at 182°C for 7 minutes with a molding pressure of 160 tons to obtain shoe sole blank. After placing the shoe sole blank at room temperature for 22 hours, heat it again at 180°C for 520 seconds. Finally, it is molded into finished sports shoe sole.

[0024] Example 4: Weigh 48 parts of ethylene-vinyl acetate copolymer, 13 parts of elastomer, 16 parts of toughening resin, 13 parts of compatibilizer, 9 parts of lubricant, 5 parts of abrasion resistant agent, 0.7 parts of ST / E stabilizer, 1.6 parts of zinc oxide, 1.6 parts of dicumyl peroxide, 2.6 parts of foaming agent, and 3.8 parts of titanium dioxide. After premixing the above components, feed them into a granulator and knead at 122°C for 14 minutes with a screw speed of 38 rpm. Extrude and pelletize to obtain masterbatch with a particle size of 2.8 mm. After color matching, use EVA chemical foaming process to heat and foam at 181°C for 7.5 minutes with a molding pressure of 148 tons to obtain shoe sole blank. After placing the shoe sole blank at room temperature for 25 hours, heat it again at 179°C for 510 seconds. Finally, it is molded into finished sports shoe soles.

[0025] Comparative Example 1: Using a traditional EVA material formula, 70 parts of ethylene-vinyl acetate copolymer, 3 parts of foaming agent, 1.5 parts of dicumyl peroxide, 2 parts of zinc oxide, 1 part of stearic acid, and 10 parts of calcium carbonate were weighed. The above components were mixed and kneaded at 120°C for 15 minutes, and then extruded and pelletized to obtain masterbatch. The masterbatch was then heated and foamed at 180°C for 8 minutes and molded under a pressure of 150 tons to obtain the sole blank. After being placed at room temperature for 24 hours, it was heated again at 178°C for 500 seconds. Finally, the finished sports shoe sole was manufactured through a molding process.

[0026] Comparative Example 2: Using the zero-degree material formula and process parameters described in Example 1, but without distinguishing between the forefoot area and the heel area in the mold design, the entire sole adopts a material structure with the same density and hardness, resulting in a homogeneous sole product.

[0027] Comparative Example 3: The zero-degree material formulation described in Example 1 was used, but the granulation temperature was increased to 140°C, the mixing time was shortened to 8 minutes, the foaming temperature was increased to 200°C, the foaming time was shortened to 5 minutes, the molding pressure was reduced to 100 tons, the secondary heating treatment step was eliminated, and the rest of the process was the same as in Example 1.

[0028] Comparative Example 4: Using natural rubber material, weigh 80 parts of natural rubber, 20 parts of carbon black, 2 parts of sulfur, 1.5 parts of accelerator, 1 part of antioxidant, 2 parts of stearic acid, and 3 parts of zinc oxide. Mix the above components in a two-roll mill for 20 minutes, then vulcanize at 160°C for 8 minutes and mold at a pressure of 150 tons to obtain rubber shoe sole products.

[0029] The test results are shown in Table 1 below: Table 1 (Performance Comparison Table) The rebound rates of Examples 1-4 remained stable in the range of 59%-61%, averaging 60%, which is a 33% increase compared to 45% for Comparative Example 1 (conventional EVA) and a 71% increase compared to 35% for Comparative Example 4 (natural rubber); the density remained between 0.11-0.13 g / cm³. 3 The average value is 0.12, which is 33% lower than 0.18 in Comparative Example 1 and 63% lower than 0.32 in Comparative Example 4, achieving significant weight reduction; the compression deformation is 35%-38%, with an average of 36%, which is better than 55% in Comparative Example 1 and 40% in Comparative Example 4, demonstrating outstanding resistance to permanent compression deformation; the wear amount is only 10-12mm. 3 The average is 11 mm, compared to 18 mm in Comparative Example 1. 3 Reduced by 39%, compared to 25mm in Comparative Example 4. 3 It reduces wear by 56% and significantly improves wear resistance.

[0030] Comparative Example 3, after deviating from the process parameters of this invention, showed a rebound rate decreasing to 52% and a density increasing to 0.15 g / cm³. 3 Compression deformation worsened to 48%, and wear increased to 14 mm. 3 All properties showed significant degradation, proving that process parameters such as granulation temperature of 120℃, mixing time of 15 minutes, foaming temperature of 180℃, molding pressure of 150 tons, and secondary heating treatment are key conditions to ensure the excellent performance of zero-degree materials. Too wide or missing parameter windows will lead to the deterioration of the material's microstructure and a decrease in the closed-cell rate.

[0031] Although Comparative Example 2 uses a zero-degree material formula and achieves the physical properties of the embodiment, it fails to achieve the synergistic function of rapid rebound of the forefoot and slow energy dissipation of the heel due to the elimination of the differentiated design between the forefoot and heel areas, thus losing gait adaptability. The embodiment, through functional zoning, enables the forefoot area to have a rapid recovery capability of 0.1-0.3 seconds and the heel area to have a slow recovery characteristic of 0.5-1 seconds, proving that the regionalized structural design of the present invention is a necessary means to achieve the effect of anti-vibration and vibration absorption technology.

[0032] 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 alterations 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.

Claims

1. A vibration-damping and shock-absorbing sports shoe sole based on robotic materials, characterized in that, The sports shoe sole is made of zero-degree material through a foaming process. The zero-degree material includes an ethylene-vinyl acetate copolymer matrix and functional modified components. The sports shoe sole has a forefoot area and a heel area. The forefoot area is equipped with a shock-absorbing support structure, and the heel area is equipped with a shock-absorbing cushioning structure. The shock-absorbing support structure absorbs impact energy and rebounds to release energy after the forefoot lands, forming dynamic support for the forefoot. The shock-absorbing and cushioning structure absorbs and dissipates impact energy after the heel lands, reducing walking fatigue.

2. The anti-vibration and vibration-absorbing sports shoe sole based on robotic materials according to claim 1, characterized in that, The zero-degree material comprises the following components, by weight: 40-60 parts ethylene-vinyl acetate copolymer, 10-15 parts elastomer, 15-25 parts toughening resin, 10-15 parts compatibilizer, 5-10 parts lubricant, 5-10 parts wear-resistant agent, 0.5-1 part ST / E stabilizer, 1-2 parts zinc oxide, 1-2 parts dicumyl peroxide, 2-3 parts foaming agent, and 3-5 parts titanium dioxide.

3. The anti-vibration and vibration-absorbing sports shoe sole based on robotic materials according to claim 1, characterized in that, The physical properties of the zero-degree material after foaming meet the following requirements: resilience 60%, compression set 36%, hardness 43C, and density 0.12 g / cm³. 3 Yellowing resistance level 4, abrasion loss 11mm 3 .

4. The anti-vibration and vibration-absorbing sports shoe sole based on robotic materials according to claim 1, characterized in that, The outsole of the athletic shoe is designed with differentiated functional areas based on human gait characteristics. The forefoot area corresponds to the toes to the front of the arch, and the heel area corresponds to the heel to the back of the arch. The material in the forefoot area recovers its deformation and generates an upward rebound force within 0.1-0.3 seconds after being compressed, with the rebound force being 60%-80% of the impact force. The material in the heel area slowly recovers its deformation within 0.5-1 seconds after being compressed, with an energy rebound rate of less than 30%.

5. A method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials, comprising the vibration-damping and shock-absorbing sports shoe sole based on robotic materials according to any one of claims 1-4, characterized in that, The preparation method includes the following steps: Granulation: Mix all components of the zero-degree material and put them into a granulator. Mix at 120°C for 15 minutes and then extrude and pelletize to obtain masterbatch. Color matching: Color masterbatch is prepared according to color requirements; Foaming: The color-adjusted masterbatch is put into a foaming machine and heated at 180°C for 8 minutes. At the same time, it is molded under 150 tons of molding pressure to obtain the shoe sole blank. Storage: Place the shoe sole blank at room temperature for 24 hours to mature, and then heat it again at 175-180℃ for 500 seconds; Molding: The stored and treated shoe sole blanks are cut, polished, and glued to make finished sports shoe soles.

6. The method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials according to claim 5, characterized in that, The screw speed of the granulator is controlled at 30-50 rpm. The extruded strip is cut into pellets after being cooled by water, and the resulting masterbatch has a particle size of 2-4 mm.

7. The method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials according to claim 5, characterized in that, The foaming process employs EVA chemical foaming technology or supercritical fluid foaming technology, and a release agent is sprayed onto the inner wall of the molding die. The release agent is either silicone oil or stearate.

8. The method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials according to claim 5, characterized in that, The storage process is divided into two stages: the first stage is to let it stand for 24 hours in an environment with a temperature of 20-25℃ and a humidity of 50%-60%; the second stage is to heat-treat it in an oven at 175-180℃ for 500 seconds to fully cross-link the shoe sole blank and stabilize its size.

9. The method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials according to claim 5, characterized in that, The zero-degree material forms a closed-cell foam structure during the foaming process, with a cell diameter of 0.1-0.5 mm, a cell wall thickness of 0.01-0.03 mm, and a closed-cell rate of over 85%. The closed-cell foam structure gives the sports shoe sole a bouncy feel, lightweight characteristics, and skin-friendly cushioning performance.

10. The method for preparing a vibration-damping and shock-absorbing sports shoe sole based on robotic materials according to claim 5, characterized in that, The prepared sports shoe sole is applied to the gait pattern of prioritizing foot lifting and heel landing last during walking. The sole area achieves anti-vibration support through the rapid compression and rebound of the closed-cell foam structure at the moment of landing, while the heel area achieves shock absorption and cushioning through the slow compression and energy dissipation of the closed-cell foam structure after landing. The anti-vibration support and shock absorption and cushioning functions work together to reduce walking energy consumption and improve foot comfort.

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