High-resilience wear-resistant football liner structure and preparation method thereof

Abstract

The invention relates to the technical field of sports equipment manufacturing, in particular to a high-resilience wear-resistant football liner structure and a preparation method thereof.The high-resilience wear-resistant football liner structure is prepared by adopting a high-elasticity polymer base material formed by blending TPU and EVA, adding nano-silica and carbon nanotube composite particles as wear-resistant reinforcing filler and using aramid fiber chopped strands as fiber reinforcing materials. The rebound resilience and the wear resistance of the inner container are obviously improved; meanwhile, the cohesive force and the crystallization structure of the material are further optimized through an accurately-controlled gradient heating heat treatment process, and the stability of the rebound rate of the inner container in the long-term use process is ensured; besides, the compact wear-resistant layer formed by the plasma spraying technology effectively resists surface damage caused by frequent impact and friction, and the service life of the inner container is remarkably prolonged, so that the requirement of the football for continuously improving the competitive performance is met, and the fairness of the competition is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sports equipment manufacturing, and particularly relates to a high-rebound and wear-resistant football bladder structure and a preparation method thereof. Background Art

[0002] As the core component of a football, the performance of the football bladder directly affects the rebound characteristics, durability, and movement trajectory stability of the football. Existing football bladders are mostly made of rubber or polyurethane materials and processed through vulcanization or hot pressing molding processes. The advantages of such bladders are: having a certain elasticity to meet basic sports requirements; the production process is mature and the cost is relatively low.

[0003] However, with the improvement of the requirements for competitive performance in football, the defects of traditional bladders gradually emerge. Firstly, after long-term use, the rebound rate is likely to decrease due to material fatigue, affecting the fairness of the game. Secondly, the surface wear resistance is insufficient, and cracks or deformations are likely to occur under frequent impacts or frictions, shortening the service life. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-rebound and wear-resistant football bladder structure and a preparation method thereof, so as to solve the problems in the prior art that with the improvement of the requirements for competitive performance in football, the defects of traditional bladders gradually emerge. Firstly, after long-term use, the rebound rate is likely to decrease due to material fatigue, affecting the fairness of the game. Secondly, the surface wear resistance is insufficient, and cracks or deformations are likely to occur under frequent impacts or frictions, shortening the service life.

[0005] To achieve the above purpose, the present invention provides a high-rebound and wear-resistant football bladder structure, which includes, by mass percentage: a high-elastic polymer substrate: 75% - 85%, a nano-scale wear-resistant reinforcing filler: 10% - 15%, a fiber reinforcing material: 3% - 8%, and a cross-linking agent: 1% - 2%.

[0006] The present invention also provides a preparation method for the high-rebound and wear-resistant football bladder structure. The preparation method for the high-rebound and wear-resistant football bladder structure includes the following steps:

[0007] Step S1: Add the high-elastic polymer substrate, nano-scale wear-resistant reinforcing filler, short aramid fiber filaments, and cross-linking agent into a high-speed mixer according to precise proportions, and control the mixing temperature and rotation speed to fully mix each component evenly.

[0008] Step S2: Inject the evenly mixed material into a football bladder mold preheated to a specified temperature, start the hot press, apply a specified pressure, enable the material to fully flow in the mold and fill the mold cavity to form a defect-free blank, and then maintain the pressure and temperature for a specified time to preliminarily cure the material.

[0009] Step S3: Place the initial embryo in a heat treatment furnace, raise the temperature to the first-stage target temperature at a rapid rate, hold for a specified time, then raise the temperature to the second-stage target temperature at a slow rate, and hold again.

[0010] Step S4: Place the heat-treated inner container in a plasma spraying device, heat the wear-resistant coating material to a molten state using a plasma arc, and uniformly spray the molten material on the surface of the inner container by precisely controlling the moving speed of the spray gun to form a dense wear-resistant layer.

[0011] Step S5: Conduct quality inspections on the finished product, including rebound rate inspection, wear resistance inspection, and airtightness inspection. After passing the inspections, the qualified products are cleaned, dried, and then packaged and stored in the warehouse.

[0012] Among them, in Step S1, the high-elastic polymer substrate is a blend of thermoplastic polyurethane elastomer and ethylene-vinyl acetate copolymer, the nano-scale wear-resistant reinforcing filler is a composite particle of nano-silica and carbon nanotubes, and the fiber-reinforcing material is short aramid fiber filaments.

[0013] Among them, in Step S1, the mixing temperature is 120°C to 140°C, and the mixing rotation speed is 800 to 1200 rpm.

[0014] Among them, in Step S2, preheat to the specified temperature of 160°C to 180°C, apply the specified pressure of 8 to 12 MPa, and maintain the pressure and temperature for the specified time of 5 to 8 minutes.

[0015] Among them, in Step S3, the rapid heating rate is 5°C / min, the first-stage target temperature is 190°C to 200°C, hold for the specified time of 30 to 40 minutes, the slow heating rate is 2°C / min, the second-stage target temperature is 150°C to 160°C, and the re-holding time is 20 to 30 minutes.

[0016] Among them, in Step S4, the spraying power is 3 to 5 kW, the spraying distance is 80 to 120 mm, the moving speed of the spray gun is 5 to 15 m / min, and the thickness of the dense wear-resistant layer is 20 to 40 μm.

[0017] Among them, in Step S5, the rebound rate inspection uses the standard falling ball method, and the qualified standard for the rebound height is not less than 1.85 m; the wear resistance inspection uses a Taber abrasion tester, and the qualified standard for the abrasion loss is ≤80 mg / 1000 r; the airtightness inspection uses the pressure decay method.

[0018] A high-rebound and wear-resistant football bladder structure and preparation method of the present invention, by adopting a highly elastic polymer substrate of TPU and EVA blend, adding composite particles of nano-silica and carbon nanotubes as wear-resistant reinforcing fillers, and short aramid fiber filaments as fiber reinforcing materials, significantly improves the rebound performance and wear resistance of the bladder; at the same time, through a precisely controlled gradient heating heat treatment process, the cohesion and crystal structure of the material are further optimized, ensuring the stability of the rebound rate during long-term use of the bladder; in addition, the dense wear-resistant layer formed by plasma spraying technology effectively resists surface damage caused by frequent impacts and friction, significantly extending the service life of the bladder, thus meeting the increasing requirements of football sports for competitive performance and ensuring the fairness of the game. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a flowchart of the steps of the high-rebound and wear-resistant football bladder structure and preparation method provided by the present invention.

[0021] Figure 2 is a flowchart of the steps of Embodiment 1 in the high-rebound and wear-resistant football bladder structure and preparation method provided by the present invention.

[0022] Figure 3 is a flowchart of the steps of Embodiment 2 in the high-rebound and wear-resistant football bladder structure and preparation method provided by the present invention.

[0023] Figure 4 is a flowchart of the steps of Embodiment 3 in the high-rebound and wear-resistant football bladder structure and preparation method provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0025] Please refer to Figures 1-4, the present invention provides a high-rebound and wear-resistant football bladder structure, which includes by mass percentage: high-elastic polymer substrate: 75% - 85%, nano-scale wear-resistant reinforcing filler: 10% - 15%, fiber reinforcing material: 3% - 8%, and cross-linking agent: 1% - 2%.

[0026] The present invention also provides a preparation method for a high-rebound and wear-resistant football bladder structure. The preparation method for the high-rebound and wear-resistant football bladder structure includes the following steps:

[0027] Step S1: Add the high-elastic polymer substrate, nano-scale wear-resistant reinforcing filler, short aramid fiber filaments, and cross-linking agent into a high-speed mixer according to precise proportions. By controlling the mixing temperature and rotation speed, make each component mix evenly.

[0028] Step S2: Inject the evenly mixed material into a football bladder mold preheated to a specified temperature. Start the hot press, apply a specified pressure, make the material flow fully in the mold and fill the cavity, form a defect-free blank, and then maintain the pressure and temperature for a specified time to preliminarily cure the material.

[0029] Step S3: Place the blank in a heat treatment furnace, rapidly heat it to the target temperature of the first stage, keep it warm for a specified time, then slowly heat it to the target temperature of the second stage and keep it warm again.

[0030] Step S4: Place the heat-treated bladder in a plasma spraying device, heat the wear-resistant coating material to a molten state by using a plasma arc, and precisely control the moving speed of the spray gun to evenly spray the molten material on the surface of the bladder to form a dense wear-resistant layer.

[0031] Step S5: Conduct quality inspections on the finished product, including rebound rate inspection, wear resistance inspection, and airtightness inspection. After the qualified products are cleaned and dried, they are packaged and stored in the warehouse.

[0032] In this embodiment, by optimizing the material ratio, using a blend of thermoplastic polyurethane elastomer and ethylene-vinyl acetate copolymer as the high-elastic polymer substrate, combining composite particles of nano-silica and carbon nanotubes as the wear-resistant reinforcing filler, and short aramid fiber filaments as the fiber reinforcing material, the rebound performance and wear resistance of the bladder are significantly improved. During the preparation process, by precisely controlling key parameters such as mixing temperature, rotation speed, mold preheating temperature, hot pressing pressure and time, heat treatment heating rate and holding time, the uniformity, density and stability of the bladder structure are ensured. In addition, using plasma spraying technology to form a dense wear-resistant layer further enhances the wear resistance of the bladder. Finally, through strict rebound rate, wear resistance and airtightness inspections, it is ensured that the performance of the finished bladder meets high-standard requirements, providing high-quality and high-performance bladder products for football sports.

[0033] Among them, in step S1, the high-elastic polymer substrate is a blend of thermoplastic polyurethane elastomer and ethylene-vinyl acetate copolymer, the nano-scale wear-resistant reinforcing filler is a composite particle of nano-silica and carbon nanotubes, and the fiber reinforcing material is short cut aramid fiber. The combination of these materials significantly improves the elasticity, wear resistance and impact resistance of the inner liner, laying a solid foundation for the excellent performance of the inner liner.

[0034] Among them, in step S1, the mixing temperature is 120°C to 140°C, and the mixing speed is 800 to 1200 rpm. By precisely controlling the mixing temperature and speed, it ensures the full mixing and uniform dispersion of each component in the high-speed mixer. This mixing process not only improves the material utilization rate but also avoids the performance degradation caused by uneven mixing, providing a strong guarantee for the excellent performance of the inner liner.

[0035] Among them, in step S2, it is preheated to a specified temperature of 160°C to 180°C, a specified pressure of 8 to 12 MPa is applied, and the pressure and temperature are maintained for a specified time of 5 to 8 minutes. By preheating the mold to the specified temperature and applying an appropriate pressure, the material fully flows in the mold and fills the cavity, forming a defect-free blank. This preforming process not only improves the forming accuracy of the inner liner but also reduces the defect rate in subsequent processing, providing important support for the excellent performance of the inner liner.

[0036] Among them, in step S3, the rapid heating rate is 5°C / min, the target temperature in the first stage is 190°C to 200°C, and it is kept warm for a specified time of 30 to 40 minutes. The slow heating rate is 2°C / min, the target temperature in the second stage is 150°C to 160°C, and the re-holding time is 20 to 30 minutes. Adopting a gradient heating heat treatment process, by rapidly heating to the target temperature in the first stage and keeping warm, and then slowly heating to the target temperature in the second stage and re-holding, this heat treatment method effectively promotes the cross-linking reaction of the material and the optimization of the crystal structure, improves the cohesion and resilience of the inner liner, and extends the service life.

[0037] Among them, in step S4, the spraying power is 3 to 5 kW, the spraying distance is 80 to 120 mm, the moving speed of the spray gun is 5 to 15 m / min, and the thickness of the dense wear-resistant layer is 20 to 40 μm. By using plasma spraying technology to evenly spray the wear-resistant coating material on the surface of the inner liner to form a dense wear-resistant layer; by precisely controlling the spraying power, spraying distance and moving speed of the spray gun, it ensures the uniformity and density of the coating, significantly improves the wear resistance of the inner liner, and resists the surface damage caused by frequent impacts and frictions.

[0038] Among them, in step S5, the rebound rate is detected by the standard falling ball method, and the qualified standard for the rebound height is not less than 1.85 m; the abrasion resistance is detected by a Taber abrasion tester, and the qualified standard for the abrasion loss is ≤80 mg / 1000 r; the airtightness is detected by the pressure decay method. Through strict quality inspection means such as rebound rate detection, abrasion resistance detection, and airtightness detection, the performance of the finished inner bladder is ensured to meet the preset standards; this comprehensive quality inspection process not only improves the product qualification rate but also provides consumers with a more reliable and durable football inner bladder product.

[0039] In the present invention, three embodiments are also provided as follows:

[0040] Embodiment 1:

[0041] Step S1: 80% of the high-elastic polymer substrate, 12% of the nano-scale wear-resistant reinforcing filler, 5% of the aramid fiber short filaments, and 3% of the cross-linking agent are sequentially added to a high-speed mixer in precise proportions. The mixing temperature is set at 125°C, the mixing speed is 1000 rpm, and the mixing is continued for 20 minutes. During this period, each component is fully mixed evenly under the action of high-speed shear force to form a uniform composite material;

[0042] Step S2: The uniformly mixed composite material is injected into a football inner bladder mold preheated to 165°C to ensure that the mold temperature is uniform and reaches the set value; then the hot press is started, and a pressure of 10 MPa is applied to allow the composite material to fully flow in the mold and fill the cavity to form a blank; the pressure and temperature conditions are maintained to initially cure the material; the pressure and temperature are maintained for 8 minutes;

[0043] Step S3: The blank is placed in a heat treatment furnace and heated uniformly to 195°C at a rate of 5°C / min and held at this temperature for 35 minutes; then, it is slowly heated to 155°C at a rate of 2°C / min and held again for 25 minutes to complete the further curing treatment of the material;

[0044] Step S4: The heat-treated inner bladder is placed in a plasma spraying device, the spraying power is set at 4 kW, the spraying distance is 100 mm, and the moving speed of the spray gun is 10 m / min; the wear-resistant coating material is heated to a molten state by the plasma arc, and by precisely controlling the moving speed of the spray gun, the molten material is evenly sprayed on the surface of the inner bladder to form a dense coating with a thickness of 30 μm;

[0045] Step S5: Strict quality inspection is carried out on the finished inner bladder, including rebound rate detection, abrasion resistance detection, and airtightness detection; the qualified inner bladder products are cleaned and dried and then packaged and stored in a standard manner.

[0046] Embodiment 2:

[0047] Step S1: Weigh 78% of the high-elastic polymer substrate, 13% of the nano-scale wear-resistant reinforcing filler, 6% of the short aramid fiber filaments, and 3% of the cross-linking agent; add these materials into a high-speed mixer in precise proportions, set the mixing temperature at 130 °C, the mixing speed at 900 rpm, and continuously mix for 25 minutes; during the mixing process, each component forms a composite material through high-speed shearing and friction effects;

[0048] Step S2: Inject the uniformly mixed composite material into a football bladder mold preheated to 170 °C, ensuring that the mold temperature is stable and reaches the set value; start the hot press, apply a pressure of 9 MPa, and make the composite material fully flow in the mold and closely adhere to the cavity wall to form a blank; maintain the pressure and temperature for 7 minutes to preliminarily cure the composite material;

[0049] Step S3: Place the blank in a heat treatment furnace, heat it to 190 °C at a rate of 5 °C / min, and keep it at this temperature for 40 minutes. Subsequently, heat it to 150 °C at a rate of 2 °C / min and keep it at this temperature for 30 minutes;

[0050] Step S4: Place the heat-treated bladder in a plasma spraying device, set the spraying power at 3.5 kW, the spraying distance at 90 mm, and the moving speed of the spray gun at 8 m / min, and uniformly spray the wear-resistant coating material on the surface of the bladder to form a coating with a thickness of 25 μm;

[0051] Step S5: Conduct a comprehensive quality inspection on the finished bladder, including key performance indicators such as the rebound rate, wear resistance, and airtightness; for the bladder products that pass the inspection, after strict cleaning and drying treatments, they are packaged and stored in accordance with regulations.

[0052] Example 3:

[0053] Step S1: Weigh 82% of the high-elastic polymer substrate, 11% of the nano-scale wear-resistant reinforcing filler, 4% of the short aramid fiber filaments, and 3% of the cross-linking agent; add these materials into a high-speed mixer in precise proportions, set the mixing temperature at 135 °C, the mixing speed at 1100 rpm, and continuously mix for 18 minutes to form a composite material with excellent comprehensive performance;

[0054] Step S2: Inject the uniformly mixed composite material into a football bladder mold preheated to 175 °C, ensuring that the mold temperature is uniform and reaches the set value; start the hot press, apply a pressure of 11 MPa to form a blank; maintain the pressure and temperature for 6 minutes;

[0055] Step S3: Place the blank in a heat treatment furnace, heat it to 200 °C at a rate of 5 °C / min, and keep it at this temperature for 30 minutes. Subsequently, slowly heat it to 160 °C at a rate of 2 °C / min and keep it at this temperature for 20 minutes;

[0056] Step S4: Place the heat-treated inner container in a plasma spraying equipment, set the spraying power to 4.5 kW, the spraying distance to 110 mm, and the moving speed of the spray gun to 12 m / min, and evenly spray the wear-resistant coating material on the surface of the inner container; by precisely controlling the spraying parameters and the moving trajectory of the spray gun, form a dense coating with a thickness of 35 μm;

[0057] Step S5: Conduct strict quality inspections on the finished inner container, including key performance indicators such as rebound rate, wear resistance, and airtightness; for the inner container products that pass the inspection, after thorough cleaning and drying, conduct standardized packaging and warehousing.

[0058] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand the implementation of all or part of the above processes, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A high-resilience and wear-resistant football bladder structure, characterized in that, By mass percentage, it includes: high-elastic polymer substrate: 75% - 85%, nano-scale wear-resistant reinforcing filler: 10% - 15%, fiber reinforcing material: 3% - 8%, and cross-linking agent: 1% - 2%.

2. A preparation method for a high-resilience and wear-resistant football bladder structure, which is applied to the high-resilience and wear-resistant football bladder structure as described in claim 1, and is characterized in that, It includes the following steps: Step S1: Add the high-elastic polymer substrate, nano-scale wear-resistant reinforcing filler, short aramid fiber filaments, and cross-linking agent into a high-speed mixer in precise proportions. By controlling the mixing temperature and rotation speed, make each component fully and evenly mixed; Step S2: Inject the evenly mixed material into a football bladder mold preheated to a specified temperature. Start the hot press and apply a specified pressure to make the material fully flow in the mold and fill the cavity, forming a defect-free blank. Then maintain the pressure and temperature for a specified time to preliminarily cure the material; Step S3: Place the blank in a heat treatment furnace, heat it to the first-stage target temperature at a fast rate, keep it warm for a specified time, then heat it to the second-stage target temperature at a slow rate and keep it warm again; Step S4: Place the heat-treated bladder in a plasma spraying device, heat the wear-resistant coating material to a molten state using a plasma arc, and by precisely controlling the moving speed of the spray gun, evenly spray the molten material on the surface of the bladder to form a dense wear-resistant layer; Step S5: Conduct quality inspections on the finished product, including rebound rate inspection, wear resistance inspection, and airtightness inspection. After the qualified products are cleaned and dried, they are packaged and stored in the warehouse.

3. The preparation method of the high-rebound wear-resistant football bladder structure according to claim 2, characterized in that In step S1, the high-elastic polymer substrate is a blend of thermoplastic polyurethane elastomer and ethylene-vinyl acetate copolymer, the nano-scale wear-resistant reinforcing filler is a composite particle of nano-silica and carbon nanotubes, and the fiber reinforcing material is short aramid fiber filaments.

4. The preparation method of the high-rebound wear-resistant football bladder structure according to claim 3, characterized in that In step S1, the mixing temperature is 120°C - 140°C, and the mixing rotation speed is 800 - 1200 rpm.

5. The preparation method of the high-rebound wear-resistant football bladder structure according to claim 4, characterized in that In step S2, the preheating to the specified temperature is 160°C - 180°C, the specified pressure applied is 8 - 12 MPa, and the time for maintaining the pressure and temperature to the specified time is 5 - 8 minutes.

6. The preparation method of the high-rebound wear-resistant football bladder structure according to claim 5, characterized in that In step S3, the fast heating rate is 5°C / min, the first-stage target temperature is 190°C - 200°C, the holding time to the specified time is 30 - 40 minutes, the slow heating rate is 2°C / min, the second-stage target temperature is 150°C - 160°C, and the re-holding time is 20 - 30 minutes.

7. The preparation method of the high-rebound wear-resistant football bladder structure according to claim 6, characterized in that In step S4, the spraying power is 3 - 5 kW, the spraying distance is 80 - 120 mm, the moving speed of the spray gun is 5 - 15 m / min, and the thickness of the dense wear-resistant layer is 20 - 40 μm.

8. The preparation method of the high-rebound wear-resistant football bladder structure according to claim 7, characterized in that In step S5, the rebound rate is detected by the standard falling ball method, and the qualified standard for the rebound height is not less than 1.85 m; the wear resistance is detected by a Taber abrasion tester, and the qualified standard for the wear amount is ≤80 mg / 1000 r; the airtightness is detected by the pressure decay method.

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