Bamboo composite rubber for shoe soles and preparation method of bamboo composite rubber

Abstract

The invention discloses bamboo composite rubber for shoe soles and a preparation method thereof, and relates to the technical field of rubber products, the bamboo composite rubber comprises the following specific components: natural rubber, bamboo powder, polyurethane, a silane coupling agent, a plasticizer, an anti-ultraviolet agent and an antibacterial agent, and a rubber matrix is formed; the bamboo composite rubber for the shoe sole further comprises additives, and the additives comprise hyperelastic nanoparticles, an environment-friendly water-based coating, a wear-resistant reinforcing agent, a heat-conducting polymer, a negative ion release material, bamboo charcoal fibers and odor-resistant molecules. According to the bamboo composite rubber for the shoe sole and the preparation method of the bamboo composite rubber, through dual surface modification of the silane coupling agent and the negative ion release material, the bonding force of the bamboo powder and a rubber matrix is remarkably improved, and the composite material has higher mechanical strength and durability. Meanwhile, due to the synergistic effect of the hyperelastic nanoparticles, the heat-conducting polymer and the wear-resistant enhancer, the sole material not only has excellent elasticity and wear resistance, but also has heat-conducting and comfort-adjusting functions.

Description

Technical Field

[0001] The invention relates to the technical field of rubber products, in particular to a bamboo composite rubber for soles and a preparation method thereof. Background Art

[0002] With the increasing awareness of environmental protection, the application of green materials has become an important trend in the field of modern sole manufacturing. Traditional sole materials mostly rely on petroleum-based synthetic rubber, which not only has the risk of resource depletion, but also has a negative impact on the environment due to the waste gas and pollutants generated during the processing. Therefore, it is urgent to find alternative environmentally friendly materials. As a renewable and environmentally friendly resource, bamboo has a fiber structure, good mechanical properties, and natural properties such as moisture absorption and antibacterial properties, making bamboo powder an ideal filler in sole composite materials. However, bamboo powder faces many challenges in practical applications due to its high hygroscopicity, easy degradation, and poor bonding with the rubber matrix.

[0003] Although existing bamboo powder composite rubber materials have shown certain advantages in certain application scenarios, their performance is still not comparable to that of traditional rubber materials. Common technical solutions often enhance the bonding strength between bamboo powder and rubber through simple physical mixing or a single surface treatment method. However, these methods fail to give full play to the multiple functions of bamboo powder, and the interfacial bonding strength and durability are still limited. In addition, the functionality of traditional sole materials is relatively single, lacking additional functions such as antibacterial, anti-odor, and thermal conductivity, and cannot meet the multiple demands of modern consumers for comfort, environmental protection, and functionality. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a bamboo composite rubber for shoe soles and a preparation method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A bamboo composite rubber for shoe soles, comprising the following specific components: natural rubber, bamboo powder, polyurethane, silane coupling agent, plasticizer, anti-ultraviolet agent and antibacterial agent, and forming a rubber matrix; The mass fractions of the above ingredients are as follows: Natural rubber is 40-45 parts; Bamboo powder is 25-30 parts; Polyurethane is 15-18 parts; Silane coupling agent is 2-4 parts; Plasticizer is 3-5 parts; Anti-ultraviolet agent is 2-4 parts; Antimicrobial agent is 1-2 parts; The bamboo composite rubber for the sole also includes additives, which include superelastic nanoparticles, environmentally friendly water-based coatings, wear-resistant reinforcing agents, thermal conductive polymers, negative ion releasing materials, bamboo charcoal fibers and anti-odor molecules; The mass fractions of the additives are as follows: Superelastic nanoparticles are 0.5-1.5 parts; Environmentally friendly water-based coating is 1.0-2.0 parts; Wear-resistant enhancer is 2.0-3.0 parts; Thermally conductive polymer is 1.5-2.5 parts; The negative ion releasing material is 0.5-1.0 part; Bamboo charcoal fiber is 1.0-1.5 parts; The anti-odor molecule is 0.5-1.0 parts.

[0006] To further optimize the technical solution, the specific components include: The silane coupling agent is one of γ-aminopropyltriethoxysilane, 3-vinyltriethoxysilane and 3-phenyltriethoxysilane, and the silane coupling agent is used to improve the adhesion between bamboo powder and natural rubber and polyurethane; The plasticizer is one of di(2-ethylhexyl) phthalate and dioctyl adipate, and the plasticizer is used to improve the flexibility, low temperature resistance and comfort of the sole; The UV inhibitor is diphenyl (2,4-dihydroxy) benzothiophene, which is used to prevent natural rubber and bamboo powder from aging and degradation due to ultraviolet rays under sunlight.

[0007] To further optimize the technical solution, the additives include: The superelastic nanoparticles are made of modified polysiloxane or polymers with nanoscale elastic network structures, forming a microscopic elastic support network in the rubber matrix of the sole; The environmentally friendly water-based coating uses water as a dispersion medium, includes biodegradable resin and green catalyst, and is coated on the surface of the rubber substrate of the sole; The wear-resistant enhancer is made of modified graphene, ultrafine silicon carbide or aluminum oxide nanoparticles, forming a wear-resistant network structure in the rubber matrix; Thermally conductive polymers include thermally conductive fillers such as boron nitride, aluminum oxide, or carbon nanotubes to improve the thermal conductivity of the rubber matrix of the sole; Bamboo charcoal fiber is prepared by extracting and carbonizing natural bamboo at high temperature.

[0008] To further optimize the technical solution, the negative ion releasing material is made of modified mineral, and the modified mineral is tourmaline; Tourmaline releases negative ions through the action of ambient moisture, triggered by the micro-electric field in the tourmaline crystal. The reaction in the tourmaline crystal structure is shown below: ; In the presence of moisture, tourmaline releases negative oxygen ions through the action of the electric field. The released negative oxygen ions react with harmful substances in the air, including ammonia and formaldehyde, thereby purifying the air inside the shoes and inhibiting the growth of bacteria and fungi.

[0009] Further optimizing the technical solution, the anti-odor molecule is a modified cyclodextrin, which is used to capture and decompose odor molecules and block the formation path of odor. The modified cyclodextrin captures odor molecules including ammonia, NH3 through inclusion complexation and performs further decomposition reaction; The inclusion action is as follows: ; The decomposition reaction is as follows: ; According to the above-mentioned inclusion complex and decomposition reaction, the modified cyclodextrin achieves a long-lasting anti-odor effect by capturing odor molecules and oxidatively decomposing them without releasing secondary pollutants.

[0010] A method for preparing bamboo composite rubber for soles is prepared based on the above-mentioned bamboo composite rubber for soles, and comprises the following specific steps: S1. Pretreatment of bamboo powder; Select bamboo powder with a particle size in the range of 100-200 meshes, dry the screened bamboo powder in an oven at 80°C-150°C for 2 hours to remove moisture and volatile impurities, and perform surface modification on the bamboo powder; S2, plasticization of natural rubber and polyurethane; Mix the natural rubber and the polyurethane, and perform plasticizing treatment on an open mill, controlling the temperature to be 60°C-150°C, and the plasticizing time to be 10 minutes, to form a uniform preliminary mixture; S3, premixing of additives; The superelastic nanoparticles, UV-resistant agent, plasticizer ester and wear-resistant enhancer were weighed in parts and dry-mixed in a high-speed mixer for 5 minutes, followed by adding the plasticizer solution and stirring for 10 minutes to form a uniform additive mixture; S4, main mixing of rubber matrix; The preliminary mixture obtained in step S2 is placed in an internal mixer, heated to 50° C.-150° C., and the bamboo powder obtained in step S1 and the additive mixture obtained in step S3 are gradually added. During the mixing process, a vulcanization accelerator and an anti-odor molecule are added to form a preliminary network structure through chemical cross-linking; S5, adding thermally conductive polymer; During the mixing process, the thermally conductive polymer is gradually added, and a trace amount of dispersant is added to obtain a mixture; S6, addition of bamboo charcoal fiber; Add the bamboo charcoal fibers into an internal mixer, and continue to mix with the mixture in step S5 for 5-15 minutes to make the bamboo charcoal fibers evenly distributed, thereby obtaining a rubber matrix; S7, spraying of environmentally friendly water-based coating; The rubber matrix obtained in step S6 is molded into a preliminary sole product, and a layer of water-based coating is evenly sprayed on the surface of the sole, with a coating thickness of 10-20 microns, and dried in an oven at 120° C. for 30 minutes to cure the coating; S8, vulcanization and molding; Put the bamboo composite rubber for soles prepared in step S7 into a vulcanizer, and vulcanize it at 120° C.-200° C. and a pressure of 6-20 MPa for 5-15 minutes to complete the cross-linking reaction and form a stable three-dimensional network structure; S9, quality inspection and performance optimization; After vulcanization, the resulting soles were subjected to a series of performance tests using bamboo composite rubber, including wear resistance, bending resistance, antibacterial and thermal conductivity.

[0011] To further optimize the technical solution, in step S1, when the bamboo powder is surface modified, a silane coupling agent is combined with tourmaline, a negative ion releasing material, for co-treatment, and the specific process is as follows: Dry the bamboo powder at 80-150℃ for 2 hours, then add the silane coupling agent solution, stir at 60-100℃ for 1-2 hours, and add tourmaline powder at the same time; After spray drying, uniform surface-modified bamboo powder particles are formed.

[0012] To further optimize the technical solution, in step S3, the superelastic nanoparticles and the wear-resistant reinforcing agent are dispersed in a coordinated manner, and an ultrasonic-assisted dispersion technology is used to form a microscopic network structure. The specific process is as follows: In the premixing stage, the superelastic nanoparticles, plasticizer, and wear-resistant enhancer are ultrasonically treated in a solvent; Ultrasonic treatment disperses the nanoparticles into the plasticizer through mechanical vibration to form a stable suspension; The suspension is then mixed with other additives to improve mixing uniformity and ensure that the nanoparticles form a supporting network in the rubber matrix.

[0013] To further optimize the technical solution, in step S5, in order to optimize the distribution of the thermally conductive polymer in the rubber matrix, a self-assembly strategy is adopted, and the cross-linked network generated by the rubber matrix during the vulcanization process is used to induce the thermally conductive filler to form a continuous thermally conductive channel; The specific process is as follows: The boron nitride nanosheets are first treated with a dispersant and then mixed with a rubber matrix; Increase the mixing temperature to 80-120°C while maintaining a low shear rate to control the orientation distribution of the filler; During the vulcanization process, the thermally conductive fillers spontaneously arrange themselves around the cross-linking points to form continuous microscopic thermally conductive channels.

[0014] To further optimize the technical solution, in step S8, during the vulcanization process, the interface reaction between bamboo powder, bamboo charcoal fiber and rubber matrix is ​​utilized to design a multiphase interface reinforcement strategy: When the vulcanizer is heated to 150-200℃, the pressure is gradually increased to 10-15MPa, and at the same time, a chemical reaction occurs between the hydroxyl groups of the silane coupling agent in the bamboo powder and the rubber molecules inside the rubber; The chemical cross-linking network formed during the vulcanization process combined with the mechanical anchoring structure of the bamboo charcoal fiber greatly improves the interfacial bonding strength.

[0015] Compared with the prior art, the present invention provides a bamboo composite rubber for soles and a preparation method thereof, which has the following beneficial effects: The bamboo composite rubber for soles and its preparation method significantly improve the bonding force between bamboo powder and rubber matrix through dual surface modification of silane coupling agent and negative ion releasing material, so that the composite material has higher mechanical strength and durability. At the same time, the synergistic effect of superelastic nanoparticles, thermal conductive polymers and wear-resistant enhancers makes the sole material not only have excellent elasticity and wear resistance, but also have thermal conductivity and comfort adjustment functions. In addition, through coating technology and activation of bamboo charcoal fibers, the sole material has multiple functions such as antibacterial, anti-odor, and temperature perception, which significantly improves the comprehensive performance of the sole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the composition of a bamboo composite rubber for shoe soles proposed by the present invention; Figure 2 The present invention is a schematic flow chart of a method for preparing bamboo composite rubber for shoe soles. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Embodiment 1:

[0021] Reference Figure 1 , which is the first embodiment of the present invention, provides a bamboo composite rubber for soles, including the following specific components: natural rubber, bamboo powder, polyurethane, silane coupling agent, plasticizer, anti-ultraviolet agent and antibacterial agent, and forms a rubber matrix.

[0022] The mass fractions of the above ingredients are as follows: The natural rubber is 40 parts.

[0023] As the main elastomer, natural rubber provides the elasticity, toughness and wear resistance of the sole. It can effectively improve the comfort and durability of the sole and has good anti-aging and wear resistance.

[0024] Bamboo powder is 25 parts.

[0025] Used as filler in sole rubber, it can improve the antibacterial and environmental performance of the material.

[0026] Bamboo powder not only enhances the mechanical strength of the material, but also has natural antibacterial properties, which helps reduce odor and bacterial growth. It also has good air permeability and moisture absorption, making the sole more comfortable and dry.

[0027] The polyurethane is 15 parts.

[0028] Polyurethane is a polymer material used to increase the elasticity, flexibility and wear resistance of the sole. Its role in the sole rubber is to enhance its durability and compression resistance.

[0029] The silane coupling agent is 2 parts.

[0030] The silane coupling agent is gamma-aminopropyltriethoxysilane, and the silane coupling agent is used for improving the adhesion between bamboo powder and natural rubber and polyurethane.

[0031] The plasticizer is 3 parts.

[0032] The plasticizer is di(2-ethylhexyl) phthalate, and the plasticizer is used for improving the flexibility, low temperature resistance and comfort of the sole.

[0033] The amount of UV inhibitor is 2 parts.

[0034] The UV inhibitor is diphenyl (2,4-dihydroxy) benzothiophene, which is used to prevent natural rubber and bamboo powder from aging and degradation due to ultraviolet rays under sunlight.

[0035] Antimicrobial agent is 1 part.

[0036] Antimicrobial agents are used to inhibit the growth of bacteria and fungi, preventing mold and odor on the sole material. It helps keep the sole hygienic, especially when used in wet conditions.

[0037] The bamboo composite rubber for the sole also includes additives, which include superelastic nanoparticles, environmentally friendly water-based coatings, wear-resistant reinforcing agents, thermal conductive polymers, negative ion releasing materials, bamboo charcoal fibers and anti-odor molecules.

[0038] The mass fractions of the additives are as follows: The amount of superelastic nanoparticles is 0.5 parts.

[0039] The superelastic nanoparticles are made of a polymer called modified polysiloxane and form a microscopic elastic support network in the rubber matrix of the sole. These nanoparticles can form a microscopic elastic support network in the rubber matrix of the sole, improving the material's ability to recover during repeated bending or stress.

[0040] Compared with traditional toughening agents, superelastic nanoparticles provide faster deformation recovery ability, allowing the sole to maintain its original elasticity during long-term use, which can not only improve the strength of the sole without reducing flexibility.

[0041] Environmentally friendly water-based coating is 1.0 part.

[0042] Environmentally friendly water-based coatings use water as a dispersion medium, including biodegradable resins and green catalysts, and are coated on the surface of the rubber substrate of the sole. Compared with traditional solvent-based coatings, environmentally friendly water-based coatings do not use organic solvents at all, reduce VOC (volatile organic compound) emissions, and meet environmental regulations. The coating has stronger wear resistance and chemical corrosion resistance, and its service life is significantly extended.

[0043] The wear-resistant enhancer is 2.0 parts.

[0044] Wear-resistant enhancers are made of modified graphene, ultrafine silicon carbide or aluminum oxide nanoparticles, forming a wear-resistant network structure in the rubber matrix. Compared with traditional carbon black fillers, wear-resistant enhancers can significantly increase the service life of the sole under high friction conditions. Using nanoparticles instead of traditional reinforcement materials makes the sole lighter overall, reducing fatigue when walking or exercising.

[0045] The thermally conductive polymer is 1.5 parts.

[0046] Thermally conductive polymers include thermally conductive fillers such as boron nitride, aluminum oxide or carbon nanotubes to improve the thermal conductivity of the rubber matrix of the sole. Compared with traditional rubber soles, thermally conductive polymers can quickly dissipate heat or retain heat, improving the comfort of the wearer in summer and winter.

[0047] The negative ion releasing material is 0.5 parts.

[0048] The negative ion releasing material is made of modified mineral, and the modified mineral is tourmaline; Tourmaline releases negative ions through the action of ambient moisture, triggered by the micro-electric field in the tourmaline crystal. The reaction in the tourmaline crystal structure is shown below: ; In the presence of moisture, tourmaline releases negative oxygen ions through the action of the electric field. The released negative oxygen ions react with harmful substances in the air, including ammonia and formaldehyde, thereby purifying the air inside the shoes and inhibiting the growth of bacteria and fungi.

[0049] Compared with traditional antimicrobial agents, negative ion-releasing materials can also neutralize odor molecules in the air inside the shoe, significantly reducing the generation of odor. Negative ion release has a soothing effect on the human body and increases wearing comfort.

[0050] The bamboo charcoal fiber is 1.0-1.5 parts.

[0051] Bamboo charcoal fiber is extracted and prepared from natural bamboo after high-temperature carbonization. It not only retains the porous adsorption structure of bamboo charcoal, but also enhances the strength and toughness of the fiber, making it a reinforcing material with excellent air permeability and antibacterial properties. Compared with traditional sole materials, bamboo charcoal fiber can quickly absorb and release moisture, keeping the inside of the shoe dry.

[0052] The anti-odor molecule is 0.5-1.0 parts.

[0053] The anti-odor molecule is a modified cyclodextrin, which is used to capture and decompose odor molecules and block the formation path of odor. The modified cyclodextrin captures odor molecules including ammonia, NH3 through inclusion complexation and further decomposes them. The inclusion action is as follows: ; The decomposition reaction is as follows: ; According to the above-mentioned inclusion complex and decomposition reaction, the modified cyclodextrin achieves a long-lasting anti-odor effect by capturing odor molecules and oxidatively decomposing them without releasing secondary pollutants.

[0054] Compared with traditional fragrance coatings, anti-odor molecules do not cover up odors, but decompose odor molecules from the source. Anti-odor molecules can also block the reproduction of bacteria and fungi to prevent further odor generation.

[0055] Through these additives, the sole materials are comprehensively improved in terms of comfort, durability, environmental protection and functionality; they take into account both environmental protection and high performance requirements, and can meet consumers' diverse demands for new sole materials; they integrate health, comfort, environmental protection and durability functions to create higher-end sole materials. Embodiment 2:

[0056] Reference Figure 2 , which is the second embodiment of the present invention, and provides a method for preparing bamboo composite rubber for soles, based on the bamboo composite rubber for soles described in embodiment 1, comprising the following specific steps: S1. Pretreatment of bamboo powder The bamboo powder with a particle size in the range of 100-200 meshes is selected, and the screened bamboo powder is dried in an oven at 80-150° C. for 2 hours to remove moisture and volatile impurities, and the surface of the bamboo powder is modified.

[0057] In this embodiment, when the bamboo powder is surface modified, a silane coupling agent is combined with tourmaline, a negative ion releasing material, for co-treatment. The specific process is as follows: Dry the bamboo powder at 80-150℃ for 2 hours, then add the silane coupling agent solution, stir at 60-100℃ for 1-2 hours, and add tourmaline powder at the same time; After spray drying, uniform surface-modified bamboo powder particles are formed.

[0058] S2. Plasticization of natural rubber and polyurethane The natural rubber and the polyurethane are mixed and plasticized on an open mill at a controlled temperature of 60°C-150°C for 10 minutes to form a uniform preliminary mixture.

[0059] During the plastication process, mechanical shearing is used to reduce the molecular weight of natural rubber and improve processing fluidity. This step lays the foundation for the subsequent mixing of bamboo powder and functional additives and ensures the uniformity of the material.

[0060] S3. Premixing of additives The superelastic nanoparticles, UV inhibitor, plasticizer ester and wear-resistant enhancer were weighed in portions and placed in a high-speed mixer for dry mixing for 5 minutes, followed by adding the plasticizer solution and continuing stirring for 10 minutes to form a uniform additive mixture.

[0061] In this embodiment, the superelastic nanoparticles and the wear-resistant reinforcing agent are dispersed in a coordinated manner, and an ultrasonic-assisted dispersion technique is used to form a microscopic network structure. The specific process is as follows: In the premixing stage, the superelastic nanoparticles, plasticizer, and wear-resistant enhancer are ultrasonically treated in a solvent; Ultrasonic treatment disperses the nanoparticles into the plasticizer through mechanical vibration to form a stable suspension; The suspension is then mixed with other additives to improve mixing uniformity and ensure that the nanoparticles form a supporting network in the rubber matrix.

[0062] The plasticizer makes it easier to disperse the components, while premixing reduces the difficulty of mixing in subsequent steps.

[0063] Ultrasonic dispersion ensures uniform distribution of nanoparticles, avoiding the agglomeration problem caused by traditional mechanical stirring. Superelastic nanoparticles work synergistically with wear-resistant enhancers to improve the wear resistance and rebound performance of the sole.

[0064] S4, main mixing of rubber matrix The preliminary mixture obtained in step S2 is placed in an internal mixer, heated to 50° C.-150° C., and the bamboo powder in step S1 and the additive mixture in step S3 are gradually added. During the mixing process, a vulcanization accelerator and an anti-odor molecule are added to form a preliminary network structure through chemical cross-linking.

[0065] S5. Add thermally conductive polymer During the mixing process, the thermal conductive polymer is gradually added, and a trace amount of dispersant is added to obtain a mixture.

[0066] In this embodiment, in order to optimize the distribution of the thermally conductive polymer in the rubber matrix, a self-assembly strategy is adopted, which utilizes the cross-linked network generated by the rubber matrix during the vulcanization process to induce the thermally conductive filler to form a continuous thermally conductive channel; The specific process is as follows: The boron nitride nanosheets are first treated with a dispersant and then mixed with a rubber matrix; Increase the mixing temperature to 80-120°C while maintaining a low shear rate to control the orientation distribution of the filler; During the vulcanization process, the thermally conductive fillers spontaneously arrange themselves around the cross-linking points to form continuous microscopic thermally conductive channels.

[0067] Through the orientation control and self-assembly of the filler, the amount of filler is reduced while the thermal conductivity is greatly improved. The problem of uneven thermal conductivity caused by the random distribution of traditional thermal conductive fillers is avoided.

[0068] S6. Addition of bamboo charcoal fiber The bamboo charcoal fibers are added into an internal mixer and continuously mixed with the mixture in step S5 for 5-15 minutes to make the bamboo charcoal fibers evenly distributed, thereby obtaining a rubber matrix.

[0069] Bamboo charcoal fiber not only provides good antibacterial and moisture absorption functions, but its porous structure can also absorb residual organic volatiles during material processing, thereby improving the environmental friendliness and hygiene of the material.

[0070] S7. Spraying of environmentally friendly water-based coatings The rubber matrix obtained in step S6 is molded into a preliminary sole product, and a layer of water-based coating with a thickness of 10-20 microns is evenly sprayed on the surface of the sole. The coating is dried in an oven at 120° C. for 30 minutes to solidify the coating.

[0071] S8, Vulcanization and molding The bamboo composite rubber for soles prepared in step S7 is placed in a vulcanizer and vulcanized at 120° C.-200° C. and a pressure of 6-20 MPa for 5-15 minutes to complete the cross-linking reaction and form a stable three-dimensional network structure.

[0072] In the embodiment, during the vulcanization process, the interfacial reaction between bamboo powder, bamboo charcoal fiber and rubber matrix is ​​utilized to design a multiphase interface reinforcement strategy: When the vulcanizer is heated to 150-200℃, the pressure is gradually increased to 10-15MPa, and at the same time, a chemical reaction occurs between the hydroxyl groups of the silane coupling agent in the bamboo powder and the rubber molecules inside the rubber; The chemical cross-linking network formed during the vulcanization process combined with the mechanical anchoring structure of the bamboo charcoal fiber greatly improves the interfacial bonding strength.

[0073] S9, quality inspection and performance optimization After vulcanization, the resulting soles were subjected to a series of performance tests using bamboo composite rubber, including wear resistance, bending resistance, antibacterial and thermal conductivity.

[0074] The main contents of the test include: Wear resistance test: Use a wear tester to simulate the wear of the sole in contact with the ground and test the wear resistance of the sole.

[0075] Bending resistance test: The bending test measures the bending resistance of the sole, that is, its bending deformation and recovery ability under force.

[0076] Antibacterial test: Through antibacterial tests, the inhibitory effect of the sole surface on bacteria is measured.

[0077] Thermal conductivity test: Test the thermal conductivity efficiency of the sole material to ensure that it can effectively dissipate heat in different environments.

[0078] The test results are shown in Table 1.

[0079] Table 1

[0080] The test results show that: Wear resistance: The wear resistance of the sole is tested under simulated use conditions. The higher the test revolutions, the better the wear resistance. In this embodiment, the sole can withstand 2800 frictions, which is close to the target value of 3000 revolutions, showing good durability.

[0081] Bending resistance: Tests the flexibility of the sole and its ability to recover after bending. The maximum bending angle is 48°, which exceeds the standard requirement of 45°, proving that the sole has good bending resistance.

[0082] Antibacterial property: The antibacterial property of the sole is evaluated through the colony inhibition test. The 92% antibacterial rate shows that the sole can effectively inhibit the growth of bacteria and ensure hygienic wearing.

[0083] Thermal conductivity: The thermal conductivity of the sole material is key. The thermal conductivity of 2.8 W / m·K indicates good heat dissipation performance and adaptability to different climatic conditions.

[0084] UV resistance: UV resistance is evaluated through UV accelerated aging tests. An UV resistance index of 5.2 indicates that the sole material can resist UV degradation for a long time and maintain good appearance and performance.

[0085] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0086] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit with a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit with a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A bamboo composite rubber for shoe soles, characterized in that: The invention comprises the following specific components: natural rubber, bamboo powder, polyurethane, silane coupling agent, plasticizer, anti-ultraviolet agent and antibacterial agent, and forms a rubber matrix; The mass fractions of the above ingredients are as follows: Natural rubber is 40-45 parts; Bamboo powder is 25-30 parts; Polyurethane is 15-18 parts; Silane coupling agent is 2-4 parts; Plasticizer is 3-5 parts; Anti-ultraviolet agent is 2-4 parts; Antimicrobial agent is 1-2 parts; The bamboo composite rubber for the sole also includes additives, which include superelastic nanoparticles, environmentally friendly water-based coatings, wear-resistant reinforcing agents, thermal conductive polymers, negative ion releasing materials, bamboo charcoal fibers and anti-odor molecules; The mass fractions of the additives are as follows: Superelastic nanoparticles are 0.5-1.5 parts; Environmentally friendly water-based coating is 1.0-2.0 parts; Wear-resistant enhancer is 2.0-3.0 parts; Thermally conductive polymer is 1.5-2.5 parts; The negative ion releasing material is 0.5-1.0 parts; Bamboo charcoal fiber is 1.0-1.5 parts; The anti-odor molecule is 0.5-1.0 parts.

2. The bamboo composite rubber for soles according to claim 1, characterized in that: Among the specific components: The silane coupling agent is one of γ-aminopropyltriethoxysilane, 3-vinyltriethoxysilane and 3-phenyltriethoxysilane, and the silane coupling agent is used to improve the adhesion between bamboo powder and natural rubber and polyurethane; The plasticizer is one of di(2-ethylhexyl) phthalate and dioctyl adipate, and the plasticizer is used to improve the flexibility, low temperature resistance and comfort of the sole; The UV inhibitor is diphenyl (2,4-dihydroxy) benzothiophene, which is used to prevent natural rubber and bamboo powder from aging and degradation due to ultraviolet rays under sunlight.

3. The bamboo composite rubber for soles according to claim 1, characterized in that: Among the additives: The superelastic nanoparticles are made of modified polysiloxane or polymers with nanoscale elastic network structures, forming a microscopic elastic support network in the rubber matrix of the sole; The environmentally friendly water-based coating uses water as a dispersion medium, includes biodegradable resin and green catalyst, and is coated on the surface of the rubber substrate of the sole; The wear-resistant enhancer is made of modified graphene, ultrafine silicon carbide or aluminum oxide nanoparticles, forming a wear-resistant network structure in the rubber matrix; Thermally conductive polymers include thermally conductive fillers such as boron nitride, aluminum oxide, or carbon nanotubes to improve the thermal conductivity of the rubber matrix of the sole; Bamboo charcoal fiber is prepared by extracting and carbonizing natural bamboo at high temperature.

4. The bamboo composite rubber for soles according to claim 1, characterized in that: The negative ion releasing material is made of modified mineral, and the modified mineral is tourmaline; Tourmaline releases negative ions through the action of ambient moisture, triggered by the micro-electric field in the tourmaline crystal. The reaction in the tourmaline crystal structure is shown below: ； In the presence of moisture, tourmaline releases negative oxygen ions through the action of the electric field. The released negative oxygen ions react with harmful substances in the air, including ammonia and formaldehyde, thereby purifying the air inside the shoes and inhibiting the growth of bacteria and fungi.

5. The bamboo composite rubber for soles according to claim 1, characterized in that: The anti-odor molecule is a modified cyclodextrin, which is used to capture and decompose odor molecules and block the formation path of odor. The modified cyclodextrin captures odor molecules including ammonia, NH3 through inclusion complexation and further decomposes them. The inclusion action is as follows: ； The decomposition reaction is as follows: ； According to the above-mentioned inclusion complex and decomposition reaction, the modified cyclodextrin achieves a long-lasting anti-odor effect by capturing odor molecules and oxidatively decomposing them without releasing secondary pollutants.

6. A method for preparing bamboo composite rubber for soles, based on the bamboo composite rubber for soles according to any one of claims 1 to 5, characterized in that: The specific steps include: S1. Pretreatment of bamboo powder; Select bamboo powder with a particle size in the range of 100-200 meshes, dry the screened bamboo powder in an oven at 80°C-150°C for 2 hours to remove moisture and volatile impurities, and perform surface modification on the bamboo powder; S2, plasticization of natural rubber and polyurethane; Mix the natural rubber and the polyurethane, perform plasticizing treatment on an open mill, control the temperature to be 60°C-150°C, and plasticize for 10 minutes to form a uniform preliminary mixture; S3, premixing of additives; The superelastic nanoparticles, UV-resistant agent, plasticizer ester and wear-resistant enhancer were weighed in parts and dry-mixed in a high-speed mixer for 5 minutes, followed by adding the plasticizer solution and stirring for 10 minutes to form a uniform additive mixture; S4, main mixing of rubber matrix; The preliminary mixture obtained in step S2 is placed in an internal mixer, heated to 50° C.-150° C., and the bamboo powder obtained in step S1 and the additive mixture obtained in step S3 are gradually added. During the mixing process, a vulcanization accelerator and an anti-odor molecule are added to form a preliminary network structure through chemical cross-linking; S5, adding thermally conductive polymer; During the mixing process, the thermally conductive polymer is gradually added, and a trace amount of dispersant is added to obtain a mixture; S6, addition of bamboo charcoal fiber; Add the bamboo charcoal fibers into an internal mixer, and continue to mix with the mixture in step S5 for 5-15 minutes to make the bamboo charcoal fibers evenly distributed, thereby obtaining a rubber matrix; S7, spraying of environmentally friendly water-based coating; The rubber matrix obtained in step S6 is molded into a preliminary sole product, and a layer of water-based coating is evenly sprayed on the surface of the sole, with a coating thickness of 10-20 microns, and dried in an oven at 120° C. for 30 minutes to cure the coating; S8, vulcanization and molding; Put the bamboo composite rubber for soles prepared in step S7 into a vulcanizer, and vulcanize it at 120° C.-200° C. and a pressure of 6-20 MPa for 5-15 minutes to complete the cross-linking reaction and form a stable three-dimensional network structure; S9, quality inspection and performance optimization; After vulcanization, the resulting soles were subjected to a series of performance tests using bamboo composite rubber, including wear resistance, bending resistance, antibacterial and thermal conductivity.

7. The method for preparing bamboo composite rubber for shoe soles according to claim 6, characterized in that: In the step S1, when the bamboo powder is surface modified, a silane coupling agent is combined with tourmaline, a negative ion releasing material, for co-treatment. The specific process is as follows: Dry the bamboo powder at 80-150℃ for 2 hours, then add the silane coupling agent solution, stir at 60-100℃ for 1-2 hours, and add tourmaline powder at the same time; After spray drying, uniform surface-modified bamboo powder particles are formed.

8. The method for preparing bamboo composite rubber for shoe soles according to claim 6, characterized in that: In step S3, the superelastic nanoparticles and the wear-resistant reinforcing agent are dispersed in a coordinated manner, and an ultrasonic-assisted dispersion technique is used to form a microscopic network structure. The specific process is as follows: In the premixing stage, the superelastic nanoparticles, plasticizer, and wear-resistant enhancer are ultrasonically treated in a solvent; Ultrasonic treatment disperses the nanoparticles into the plasticizer through mechanical vibration to form a stable suspension; The suspension is then mixed with other additives to improve mixing uniformity and ensure that the nanoparticles form a supporting network in the rubber matrix.

9. The method for preparing bamboo composite rubber for shoe soles according to claim 6, characterized in that: In step S5, in order to optimize the distribution of the thermally conductive polymer in the rubber matrix, a self-assembly strategy is adopted, and the cross-linked network generated by the rubber matrix during the vulcanization process is used to induce the thermally conductive filler to form a continuous thermally conductive channel; The specific process is as follows: The boron nitride nanosheets are first treated with a dispersant and then mixed with a rubber matrix; Increase the mixing temperature to 80-120°C while maintaining a low shear rate to control the orientation distribution of the filler; During the vulcanization process, the thermally conductive fillers spontaneously arrange themselves around the cross-linking points to form continuous microscopic thermally conductive channels.

10. The method for preparing bamboo composite rubber for shoe soles according to claim 6, characterized in that: In step S8, during the vulcanization process, the interface reaction between bamboo powder, bamboo charcoal fiber and rubber matrix is ​​utilized to design a multiphase interface reinforcement strategy: When the vulcanizer is heated to 150-200℃, the pressure is gradually increased to 10-15MPa, and at the same time, a chemical reaction occurs between the hydroxyl groups of the silane coupling agent in the bamboo powder and the rubber molecules inside the rubber; The chemical cross-linking network formed during the vulcanization process combined with the mechanical anchoring structure of the bamboo charcoal fiber greatly improves the interfacial bonding strength.

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