Super wear-resistant and bending-resistant rubber sole and preparation method thereof

Abstract

The invention relates to the technical field of rubber materials, and discloses a super wear-resistant and bending-resistant rubber shoe sole and a preparation method thereof, and the rubber shoe sole comprises the following components by weight: 5-15 parts of styrene butadiene rubber; 1-6 parts of plant fiber; 2 to 7 parts of a degradable polymer; 0.5 to 2 parts of a plasticizer; 0.1 to 0.5 part of an anti-aging agent; 0.2 to 1 part of a cross-linking agent; 2-8 parts of a filling agent; the plant fibers are bamboo fibers and jute fibers, the length of the plant fibers is 1-5mm, the diameter of the plant fibers is 10-100 microns, and the plant fibers are uniformly dispersed in the sole and can be fully combined with the rubber base material and the degradable polymer; the degradable polymer is a polylactic acid and a bio-based ethylene-vinyl acetate copolymer. By introducing a synergistic formula of the plant fibers, the plasticizer and the degradable polymer, excellent fatigue resistance, formability and smooth resilience of the material are realized.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, specifically to an ultra-wear-resistant and bend-resistant rubber shoe sole and its preparation method. Background Technology

[0002] In daily life, shoe sole materials not only need to withstand repeated bending and impact, but also need to maintain good elasticity and comfort during long-term wear. Especially in application scenarios such as walking, running, or standing for long periods of time, whether the sole has smooth resilience and structural fatigue resistance directly affects the wearing experience and product lifespan.

[0003] Current technologies primarily utilize styrene-butadiene rubber (SBR) and natural rubber, adjusting basic mechanical properties by adding carbon black and vulcanizing agents. These technologies feature mature formulations, good elasticity, and are suitable for mass production of ordinary shoe soles, offering relatively stable cost control. Under specific process conditions, their structural strength and mold reproducibility are stable, exhibiting a certain degree of reliability and practicality within conventional operating ranges. Therefore, they are widely used in ordinary work shoes and casual shoes.

[0004] However, existing technologies lack structural integrity after repeated dynamic deformations, making them prone to crack propagation due to localized stress accumulation and resulting in a shorter lifespan. The processing also presents challenges: insufficient fluidity makes it difficult to completely fill mold edges, hindering high-precision pressing. Another significant drawback lies in comfort; the material's sluggish response and insufficient rebound lead to residual deformation and a firm feel underfoot. These problems ultimately stem from a lack of flexible adjustment mechanisms in the structural design, which is the key issue this invention addresses through multi-component collaborative design. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ultra-wear-resistant and bend-resistant rubber shoe sole and its preparation method, solving the problems of easy fatigue cracking, poor molding fluidity, and lack of supple resilience of existing rubber shoe sole materials during dynamic use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: the rubber sole is composed of the following components in parts by weight: Styrene-butadiene rubber (SBR): 5-15 parts, serving as the rubber base material and playing a major structural role. SBR possesses excellent abrasion resistance and flexibility, forming the basis for the durability and deformation recovery capabilities of shoe soles. In this invention, SBR provides a continuous phase, ensuring the elastic continuity and macroscopic formability of the overall structure, and providing a physical carrier for the embedding and distribution of other functional components.

[0007] Plant fibers: 1-6 parts, wherein the plant fibers are bamboo fibers and hemp fibers, the length of the plant fibers is 1-5 mm, and the diameter is 10-100 micrometers; the introduction of plant fibers plays a dual role in structural reinforcement and micro-dispersion in the rubber material system. Plant fibers have good rigidity modulus, and through the fiber network structure, they can suppress the deformation concentration of the rubber matrix under repeated bending or impact at the microscopic level. At the same time, their natural surface functional groups can physically entangle or weakly chemically interact with some polymers during subsequent vulcanization, thereby stabilizing them in the rubber network and improving their dispersion uniformity and interfacial bonding strength.

[0008] Biodegradable polymer: 2-7 parts, wherein the biodegradable polymer is a copolymer of polylactic acid and bio-based ethylene-vinyl acetate, and the molecular weight range of the biodegradable polymer is 20,000-150,000; the introduction of biodegradable polymers such as polylactic acid (PLA) reflects its green and environmentally friendly performance. These materials possess certain thermoplasticity and flexibility, and can form local compatibility zones when blended with rubber, helping to alleviate the hardening trend of the rubber system. Simultaneously, their unique structural characteristics give them the potential to gradually degrade in the natural environment after their service life, thus reducing the environmental burden. Compatibility with styrene-butadiene rubber is achieved through interfacial synergistic regulation, forming a semi-continuous or microphase distribution during the mixing stage, providing sufficient mechanical complementarity.

[0009] Plasticizer: 0.5-2 parts, wherein the plasticizer is dioctyl phthalate and xylene glycol ester, and the amount of plasticizer is controlled in an appropriate ratio according to the rubber formulation requirements; the plasticizer is mainly used to adjust the processing fluidity and softness of the rubber composite system. The dioctyl phthalate and xylene glycol ester used have good compatibility, can penetrate into the rubber segments, lower its glass transition temperature, and make the material easier to flow and fill the mold during the molding stage, thereby improving processability; after curing, it still retains appropriate flexibility, avoiding fatigue crack propagation caused by increased brittleness.

[0010] Anti-aging agent: 0.1-0.5 parts. The anti-aging agent is composed of aromatic amine antioxidants and phenolic antioxidants. The addition of the anti-aging agent is used to improve the stability of the sole during use and prevent rubber degradation under high temperature, ultraviolet or oxidative environments. This component mainly delays the breakage of rubber segments through free radical capture and antioxidant shielding, ensuring the continuity of material performance throughout its service life.

[0011] Crosslinking agent: 0.2-1 part. The crosslinking agent plays a key chemical role in rubber products. Its main function is to build a rubber network structure, thereby improving the overall mechanical strength and thermal stability. By introducing an appropriate amount of crosslinking agent to achieve the vulcanization crosslinking reaction, a three-dimensional network is formed at the molecular level, which enables the composite material to have good recovery force after deformation, thereby enhancing its bending resistance.

[0012] Filler: 2-8 parts. As an inorganic component in the formulation, the filler mainly serves to regulate volume stability and control costs. The filler can fill the pores in the rubber system, improve density, and form a composite structural skeleton with plant fibers and biodegradable polymers, thereby enhancing the overall structural stability of the sole.

[0013] This invention also provides a method for preparing an ultra-wear-resistant and bend-resistant rubber shoe sole, comprising the following steps: S1. Styrene-butadiene rubber, nano-reinforcing materials, plant fibers, biodegradable polymers, plasticizers, anti-aging agents, crosslinking agents and fillers are added to a mixing machine according to the above proportions for preliminary mixing. The mixing temperature is controlled at 100-160℃ and the mixing time is 30-60 minutes. S2. The mixed rubber compound is combined with EVA foam material through a synchronous molding process, with the temperature controlled at 150-180℃, the pressure controlled at 5-15MPa, and the hot pressing time at 3-5 minutes. S3. Apply a self-healing coating to the surface of the molded shoe sole. The coating is a reversible chemical reaction coating. The curing temperature is 120-150℃ and the curing time is 10-20 minutes. S4. The soles coated with the self-healing coating are vulcanized at a temperature of 150-180℃ for 15-30 minutes and a final cooling time of 2-5 hours.

[0014] Preferably, in step S1, the step of feeding the mixture into the mixer according to the specified proportion includes the following steps: Weigh the styrene-butadiene rubber, plant fiber, biodegradable polymer, plasticizer, anti-aging agent, crosslinking agent and filler according to the above proportions to ensure that the proportions of each component are accurate; then add all materials to the mixer for preliminary mixing, the mixing time is 30-60 minutes, and the temperature is controlled at 100-160℃. The temperature and time settings during the mixing process not only promote the softening and flow of rubber segments but also provide thermodynamic conditions for the interaction of various components. In particular, the intermolecular interpenetration between styrene-butadiene rubber and plasticizers, as well as the adhesion and synergy between the plant fiber surface and the rubber matrix, initially establish an interfacial bonding state at this stage, providing a structural prototype for the overall rubber network system. Furthermore, the coordination of interfacial stress between the biodegradable polymer and rubber segments also depends on the regulation of molecular motion by the mixing conditions. Crosslinking agents and anti-aging agents need to be fully dispersed at this stage to ensure efficient functionality in subsequent reaction stages.

[0015] Preferably, in step S2, the step of combining the material with EVA foam through a simultaneous molding process includes the following steps: The mixed rubber compound and EVA foam material are placed together in a synchronous molding mold. While the EVA foam material is not fully cured, the rubber sheet and EVA material come into contact. Heating to 150-180℃, the two are hot-pressed together under pressure. Temperature and pressure must be strictly controlled, and the hot-pressing time is 3-5 minutes, resulting in a tight bond between the rubber and EVA foam material. This method of hot-pressing the rubber composite layer while the EVA foam material is not fully cured effectively solves common problems in the bonding of dissimilar materials, such as interfacial delamination or uneven adhesion. Applying constant temperature and pressure in the molding mold not only promotes the shaping of the rubber material but also simultaneously completes the physical interfacial integration between the rubber and the foam. This process establishes a permeable network between the porous EVA and rubber molecular chains at the microscopic level, enabling the two materials to not only form a structural unity but also achieve elastic coordination in the transition region at the microscopic level.

[0016] Preferably, in step S3, applying a self-healing coating includes the following steps: Prepare a self-healing coating material with reversible chemical reaction, and then use a spraying method to evenly apply the self-healing coating to the surface of the molded shoe sole. The coating thickness is uniform. Finally, put the coated shoe sole into a curing equipment. The curing temperature is 120-150℃ and the curing time is 10-20 minutes. The choice of coating method ensures that the coating is evenly distributed on the sole surface, forming a continuous and dense protective layer. The adhesion between this coating and the rubber substrate depends on the surface activity state of the material and the compatibility of the coating solvent system; therefore, the control of the substrate surface tension during the initial mixing and molding stages directly affects the coating film quality. During the curing stage, the coating completes the construction of its cross-linked structure, forming a responsive functional film.

[0017] Preferably, in step S4, the vulcanization treatment of the shoe sole includes the following steps: Place the shoe sole with the self-healing coating into the vulcanizing furnace and set the vulcanizing temperature to 150-180℃. Vulcanize at this temperature. The vulcanizing time is adjusted according to the thickness and material properties of the shoe sole. After vulcanization is complete, remove the shoe sole from the vulcanizing furnace and place it in a cooling device for 2-5 hours of cooling treatment.

[0018] The role of the vulcanization stage is not only in the chemical cross-linking of the rubber backbone, but also in the stabilization of biodegradable polymers, plant fibers, and their interfacial regions. This process stabilizes the macroscopic elastic modulus of the composite material and ultimately fixes the spatial distribution relationship between the components, establishing a three-dimensional network structure. Based on this, the cooling step is designed to control the shrinkage rate of the rubber segments, preventing the accumulation of thermal stress that could cause microcracks or delamination.

[0019] This invention provides an ultra-wear-resistant and bend-resistant rubber shoe sole and its preparation method. It has the following beneficial effects: 1. This invention employs a technical solution of constructing a micro-support network by blending plant fibers and rubber, which improves the material's resistance to bending fatigue. Compared with traditional rubber systems without fiber reinforcement, it effectively avoids early cracks and structural failures during bending, thus solving the problem of poor durability.

[0020] 2. This invention adjusts the processing behavior of the matrix by compounding plasticizers, so that the rubber system has stronger flow adaptability in compression molding. In the prior art, the high rigidity of the formula often leads to the problem of incomplete mold filling. This technology significantly reduces the phenomena such as molding edge defects and surface blistering, and avoids the high scrap rate in actual production.

[0021] 3. This invention adopts a technical approach that introduces flexible biodegradable polymers, enabling the material to maintain a high recovery rate under multiple dynamic deformations and to smoothly follow foot movements. Compared with common high-elasticity but uneven rebound rubber products on the market, this structural design does not rely on the adjustment of a single component, thus solving the problem of lag in the dynamic cushioning performance of traditional materials.

[0022] 4. The overall material structure design of this invention takes into account processing, mechanical, and environmental performance, achieving performance balance through the synergistic effect of the multiphase system's internal structure. Unlike single-modification approaches, this composite strategy breaks away from the traditional filler-toughening model, achieving a flexible upgrade while maintaining strength, making it more promising for widespread application. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0024] 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.

[0025] Unless otherwise stated, the raw materials and reagents used in the following examples are commercially available products or can be prepared by known methods.

[0026] Please see the appendix Figure 1 : Example 1: Component ratio (by weight): Styrene-butadiene rubber: 10 parts, plant fiber: 3.5 parts, biodegradable polymer: 4.5 parts, plasticizer: 1.2 parts, anti-aging agent: 0.3 parts, crosslinking agent: 0.6 parts, filler: 5 parts, nano-reinforcing material: 1 part.

[0027] Preparation steps: Mixing: After weighing all components according to the above proportions, add them sequentially to a closed mixer. First, add styrene-butadiene rubber, fillers, and nano-reinforcing materials for initial plasticizing. Subsequently, add plant fibers, biodegradable polymers, plasticizers, anti-aging agents, and crosslinking agents sequentially. Set the mixing temperature to 140℃ and the mixing time to 45 minutes, until the mixture is homogeneous.

[0028] Simultaneous molding: The rubber mixture is compressed into a sheet and placed together with the semi-cured EVA foam material into a molding mold. The hot pressing temperature is set to 165℃, the pressure to 10MPa, and the pressure is held for 3 minutes to complete the molding of the composite structure.

[0029] Self-healing coating application: The pre-prepared reversible chemical reaction self-healing coating solution was uniformly applied to the sole surface by spraying, with the coating thickness controlled at approximately 30 micrometers. The sole was then placed in a thermosetting device, with the curing temperature set at 135℃ and the curing time at 15 minutes.

[0030] Vulcanization and cooling: The molded shoe sole is placed in a vulcanizing furnace and vulcanized at 170℃ for 25 minutes. After vulcanization, it is removed and allowed to cool naturally for 4 hours to complete the product setting.

[0031] Example 2: Component ratio (by weight): Styrene-butadiene rubber: 15 parts, plant fiber: 6 parts, biodegradable polymer: 7 parts, plasticizer: 2 parts, anti-aging agent: 0.5 parts, crosslinking agent: 1 part, filler: 8 parts, nano-reinforcing material: 5 parts.

[0032] Preparation steps: Mixing: After weighing according to the formula, first mix and pre-mix the styrene-butadiene rubber with the filler and nano-reinforcing materials, then add the plant fiber, biodegradable polymer, plasticizer, anti-aging agent and crosslinking agent in sequence. The mixing temperature is controlled at 160℃ and the mixing time is 60 minutes.

[0033] Simultaneous molding: The treated rubber sheet and the incompletely cured EVA foam material are placed into a mold and hot-pressed at 180°C. A pressure of 15MPa is applied and the pressure holding time is 5 minutes to obtain a composite shoe sole blank.

[0034] Self-healing coating application: The coating material is applied evenly by spraying, with the coating thickness set slightly higher than the median value. The curing temperature is then controlled at 150℃ and the curing time is 20 minutes to ensure the stability of the coating structure.

[0035] Vulcanization and cooling: The vulcanization temperature is set to 180℃ and the time is 30 minutes. After completion, the soles are removed and allowed to cool naturally for 5 hours.

[0036] Example 3: Component ratio (by weight): Styrene-butadiene rubber: 5 parts, plant fiber: 1 part, biodegradable polymer: 2 parts, plasticizer: 0.5 parts, anti-aging agent: 0.1 parts, crosslinking agent: 0.2 parts, filler: 2 parts, nano-reinforcing material: 0.5 parts.

[0037] Preparation steps: Mixing: Weigh the components according to the formula and add them to the mixer in sequence. Set the operating temperature to 100℃ and the mixing time to 30 minutes to form a basically uniform mixture.

[0038] Simultaneous molding: The rubber sheet and preheated EVA foam material are placed into the mold cavity, and the hot pressing temperature is set to 150℃ and the pressure to 5MPa. The mixture is held for 3 minutes to form a preliminary composite structure.

[0039] Self-healing coating application: The coating is sprayed and cured at 120°C for 10 minutes to form a basically continuous coating film.

[0040] Vulcanization and cooling: The sole is vulcanized at 150°C for 15 minutes, then cooled for 2 hours to complete the final sole structure.

[0041] Comparative Example 1: Compared with Example 1, the difference is that no plant fiber was added, but all other aspects are the same; after omitting the plant fiber, the rubber matrix lacks micro-reinforcing units, and the local structure of the material cannot be supported by the fiber structure, making it difficult to maintain structural integrity during repeated bending. Comparative Example 2: Compared with Example 1, the difference is that no plasticizer was added, and all other aspects are the same; in the absence of plasticizer, the rubber system has poor fluidity during the mixing and molding process, and uneven shearing is prone to occur during the processing, which ultimately affects the structural density and the flexibility of the rubber matrix. Comparative Example 3: Compared with Example 1, the difference is that no biodegradable polymer was added. Removing this component would cause the material to lose its biodegradability, making it impossible to achieve the constructed environmentally friendly functional pathway, and also weakening the flexibility adjustment effect of the rubber system.

[0042] Experiment 1: Experimental Objective: To verify whether the rubber sole prepared in Example 1 possesses good structural retention and fatigue crack resistance after multiple bending cycles. By comparing it with the sample in Comparative Example 1 (which does not contain plant fibers), the role of plant fibers in enhancing the bending resistance of the rubber matrix is ​​evaluated.

[0043] Experimental steps: Sample fixing: Fix one end of the standard size sample in the tester fixture and connect the other end to the swing arm to ensure uniform force distribution.

[0044] Preload setting: Start the tester to perform 50 pre-bending cycles to eliminate clamping stress and allow the material to adapt to the test rhythm.

[0045] Formal testing: Set the tester to the target number of cycles (e.g., 1000, 2000, 3000, 4000, 5000 times, etc.), and record the surface cracks, edge cracks, deformation, etc. of the sample after the test in stages.

[0046] Structural evaluation: The physical state of the sample at each stage was recorded using visual inspection and low-magnification magnification. The number of cycles at which the first crack appeared was taken as the "initial crack point". The test was terminated when the structure was obviously damaged (such as through cracks or breaks).

[0047] Results determination: Qualitative analysis was conducted based on indicators such as structural integrity maintenance time, crack distribution density, and crack propagation rate (experimental results are shown in Table 1).

[0048] Table 1: Comparison Test Data of Bending Resistance From Table 1, we can obtain: The experimental results show that the ability of rubber composite materials to maintain structural integrity and suppress cracks after repeated bending cycles differs significantly from the presence or absence of plant fibers in the material system. In samples containing plant fibers, no obvious through-cracks appeared during bending; cracks occurred less frequently and were confined to stress-concentrated edge regions. In contrast, the control sample without plant fibers developed cracks at an earlier stage, which rapidly propagated into the main structure. This difference indicates that the presence or absence of micro-reinforcing structures in the material system has a decisive influence on crack formation and propagation under the cumulative effects of multiple deformations.

[0049] This performance advantage is attributed to the microscopic network support structure formed by the fibers within the rubber matrix. Plant fibers themselves possess high rigidity modulus and low elongation at break, allowing them to distribute between rubber segments during the rubber compounding process, creating multi-point support and physical entanglement effects. When external loading generates repetitive stress, the fiber network can absorb some strain and suppress localized stress concentration, thereby enhancing the overall toughness and crack-resistant capability of the composite system. Furthermore, the interfacial transition region formed between the fibers and rubber also helps bridge the performance differences between rigid and flexible materials, achieving a smooth transition of internal stress.

[0050] Therefore, introducing natural plant fibers into rubber material systems not only creates reinforcing units for the elastic network in structural design, but also synergistically constructs a fatigue-resistant functional layer with high structural integrity in conjunction with other formulation components. This enhancement mechanism relies on a functional improvement path achieved through multiphase distribution and structural coupling, reflecting the core innovative direction of composite rubber material design thinking shifting from single modification to multi-level structural integration.

[0051] Experiment 2: Experimental objective: By comparing the processing performance of formulations containing and without plasticizers, this study aims to observe the flowability, mold filling effect, and post-molding structural density of materials during mixing and hot pressing, thereby evaluating the actual role of plasticizers in processing behavior.

[0052] Experimental steps: Mixing evaluation: Under the same process conditions, the two formulations are mixed, and the rubber's wrapping properties on the roller, extensibility, and ability to be successfully formed into sheets are recorded. Observe whether there are uneven adhesion, delamination, or filler overflow.

[0053] Mold Injection and Filling: Place the mixed rubber sample into a flat mold and observe whether it can be evenly spread and cover the mold area before pressure is applied.

[0054] Hot pressing: After performing uniform hot pressing operations, take out the sample for preliminary structural observation, record whether the mold corners are filled, whether the sample is completely formed, and whether cracks, bubbles or uneven thickness appear.

[0055] Appearance analysis and recording: Combining visual and tactile perception, processing defects such as sheet surface flatness and hard edge warping were recorded to evaluate the processability of the formulation (experimental results are shown in Table 2).

[0056] Table 2: Comparison of Processing Performance Data From Table 2, we can obtain: The molding and processing test results show that the control sample without plasticizer exhibits strong rigidity and flow restriction during mixing and hot pressing, leading to a series of molding defects such as incomplete mold filling and non-dense finished product structure. In contrast, the composite material in the example, under the same process conditions, achieves full mold filling and good surface structure formation, demonstrating excellent processing adaptability. This comparative result verifies that introducing a composite plasticizer into the formulation effectively improves the plasticity and handling tolerance of the material during hot processing.

[0057] This phenomenon can be explained by the intermolecular interaction mechanism of rubber. The addition of composite plasticizers acts as a "molecular bridge" in the rubber matrix, reducing the cohesive energy between polymer chains and promoting the relative slippage of rubber segments, thus enabling the material to exhibit better flow and elongation during mixing and pressing. On the other hand, these small molecule plasticizers, through physical association with rubber molecules, provide more thorough dispersion and lubrication during heating, thereby improving the overall thermal stress distribution during processing and suppressing molding defects caused by local stress accumulation.

[0058] Therefore, by precisely constructing the plasticizing system in the formulation, molecular structural characteristics suitable for hot-pressing flow and filling are guided to form during the pre-vulcanization stage of the material. This allows the rubber system to achieve excellent processing stability and molding integrity without sacrificing structural integrity. This structural control strategy for processing performance is a key optimization in the design of this material system to meet the requirements of actual production efficiency and product quality.

[0059] Experiment 3: Experimental objective: To investigate the material's ability to undergo flexible deformation under pressure and its recovery efficiency after release, and to analyze its contribution to dynamic deformation regulation by comparing the differences in formulations with and without the addition of biodegradable polymers.

[0060] Experimental steps: Sample placement: Place the standard sample in the center of the pressure plate, ensuring that the upper and lower force-bearing surfaces are in flat contact.

[0061] Compression test: Compress the sample to 50% of its thickness at a rate of 5 mm / min, record the time required to reach the set compression displacement and the instantaneous force change, and observe whether the deformation of the sample surface is uniform.

[0062] Unloading and Restoration: Quickly unload to 0 pressure, let stand for 30 seconds, and record the thickness of the restored sample and its ratio to the original thickness.

[0063] Loop test: Repeat the loading and unloading process for 3 cycles to assess whether there are behaviors such as permanent deformation, reduced rebound, or significant hysteresis.

[0064] Performance evaluation: The flexibility and dynamic response capability were evaluated based on the thickness recovery rate, deformation consistency and elasticity change trend (experimental results are shown in Table 3).

[0065] Table 3: Test Data of Flexibility and Dynamic Response Performance From Table 3, we can obtain: Flexibility and dynamic response tests showed that the material incorporating the biodegradable polymer exhibited higher thickness recovery and more stable deformation consistency during multiple loading and unloading cycles, indicating that this modified system possesses excellent dynamic buffering and flexible recovery capabilities. In contrast, the sample without this component was prone to irreversible indentation and residual edge deformation after repeated compression, with a significant reduction in surface elasticity. This difference highlights the important role of biodegradable polymers in regulating internal molecular motion and enhancing strain mitigation within materials.

[0066] The mechanism behind this performance improvement lies in the formation of a certain proportion of flexible regulating phases by the biodegradable polymer within the rubber matrix. These phases participate in the stress distribution process within the rubber network structure through semi-interpenetration or local nesting. Their low glass transition properties enable good deformability at room temperature and allow for reversible segment slippage during loading, assisting the main rubber phase in alleviating localized stress concentrations. After unloading, these molecular structures can drive the matrix to spring back through their own elastic recovery behavior, thereby enhancing the overall resilience and structural compliance of the material.

[0067] By introducing bio-based polymer components with flexible chain segment characteristics into the formulation, a micro-regulation mechanism was achieved during the macroscopic deformation process, enabling the material to possess excellent dynamic responsiveness and cyclic elasticity without sacrificing structural stability. This design not only enhances the adaptability of the sole material to complex foot movements but also provides a strong support path for the performance balance of green degradable materials.

[0068] 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 super wear-resistant and bend-resistant rubber shoe sole, characterized in that, The rubber sole is composed of the following components in parts by weight: Styrene-butadiene rubber: 5-15 parts; Plant fiber: 1-6 parts; Biodegradable polymers: 2-7 parts; Plasticizer: 0.5-2 parts; Anti-aging agent: 0.1-0.5 parts; Crosslinking agent: 0.2-1 part; Filler: 2-8 parts.

2. The ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 1, characterized in that, The plant fibers are bamboo fibers and hemp fibers, with a length of 1-5 mm and a diameter of 10-100 micrometers.

3. The ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 1, characterized in that, The biodegradable polymer is a polylactic acid and bio-based ethylene-vinyl acetate copolymer, and the molecular weight range of the biodegradable polymer is 20,000-150,000.

4. The ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 1, characterized in that, The plasticizers are dioctyl phthalate and xylene glycol ester.

5. A method for preparing an ultra-wear-resistant and bend-resistant rubber shoe sole, used to prepare the ultra-wear-resistant and bend-resistant rubber shoe sole according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Styrene-butadiene rubber, nano-reinforcing materials, plant fibers, biodegradable polymers, plasticizers, anti-aging agents, crosslinking agents and fillers are added to a mixing machine according to the above proportions for preliminary mixing. The mixing temperature is controlled at 100-160℃ and the mixing time is 30-60 minutes. S2. The mixed rubber compound is combined with EVA foam material through a synchronous molding process, with the temperature controlled at 150-180℃, the pressure controlled at 5-15MPa, and the hot pressing time at 3-5 minutes. S3. Apply a self-healing coating to the surface of the molded shoe sole. The coating is a reversible chemical reaction coating. The curing temperature is 120-150℃ and the curing time is 10-20 minutes. S4. The soles coated with the self-healing coating are vulcanized at a temperature of 150-180℃ for 15-30 minutes and a final cooling time of 2-5 hours.

6. The method for preparing an ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 5, characterized in that, In step S1, the step of feeding the mixture into the mixer according to the specified ratio includes the following steps: Weigh the styrene-butadiene rubber, plant fiber, biodegradable polymer, plasticizer, anti-aging agent, crosslinking agent and filler according to the specified ratio to ensure that the proportion of each component is accurate; then add all materials to the mixer for preliminary mixing, the mixing time is 30-60 minutes, and the temperature is controlled at 100-160℃.

7. The method for preparing an ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 5, characterized in that, In step S2, the process of combining the material with EVA foam through synchronous molding includes the following steps: The mixed rubber compound and EVA foam material are placed together in a synchronous molding mold. Before the EVA foam material is fully cured, the rubber sheet and EVA material come into contact. The mixture is heated to 150-180℃ and then hot-pressed together under pressure. The temperature and pressure need to be strictly controlled. The hot-pressing time is 3-5 minutes, resulting in a tight bond between the rubber and EVA foam material.

8. The method for preparing an ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 5, characterized in that, In step S3, applying a self-healing coating includes the following steps: Prepare a self-healing coating material with reversible chemical reaction, and then use a spraying method to evenly apply the self-healing coating to the surface of the molded shoe sole. The coating thickness should be uniform. Finally, place the coated shoe sole into a curing device. The curing temperature is 120-150℃ and the curing time is 10-20 minutes.

9. The method for preparing an ultra-wear-resistant and bending-resistant rubber shoe sole according to claim 5, characterized in that, In step S4, the sole undergoes vulcanization treatment. Includes the following steps: Place the shoe sole with the self-healing coating into the vulcanizing furnace and set the vulcanizing temperature to 150-180℃. Vulcanize at this temperature. The vulcanizing time is adjusted according to the thickness and material properties of the shoe sole. After vulcanization is complete, remove the shoe sole from the vulcanizing furnace and place it in a cooling device for 2-5 hours of cooling treatment.

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