A radial bicycle pneumatic tire and its manufacturing process

Abstract

This invention relates to the field of pneumatic tire manufacturing technology, and discloses a radial bicycle pneumatic tire comprising the following components by weight percentage: 30%-55% natural rubber, 13%-25% synthetic rubber, 2%-7% carbon nanotubes, 5%-9% diethylene vulcanizate, 3%-6% propylene glycol diisobutyrate, 2%-4% dibutyl dithiocarbamate, 0.3%-0.8% UV stabilizer, 1%-5% crack inhibitor, 2%-3.7% waterproofing agent, and 1.5%-2.6% diethylene vulcanizate; benzothiadiazole thione is present at 2%-3% by weight. Due to its design characteristics, radial tires exhibit superior wear resistance and shear strength. In contrast, bias-ply tires have a relatively shorter service life. The long lifespan of radial bicycle pneumatic tires reduces the frequency and cost of tire replacement, providing a more economical and reliable option.

Description

Technical Field

[0001] This invention relates to the field of pneumatic tire manufacturing technology, specifically to a radial bicycle pneumatic tire and its manufacturing process. Background Technology

[0002] Bicycles, as an environmentally friendly, healthy, and economical mode of transportation, are increasingly popular and widely used. As a crucial component of a bicycle, tire performance plays a vital role in the riding experience and safety. Currently, most bicycle tires utilize bias-ply technology; however, bias-ply tires have some shortcomings in terms of rolling resistance, cushioning, traction, and lifespan.

[0003] The following is a detailed description of the shortcomings of existing technologies:

[0004] High rolling resistance: Most current bicycle tires use a bias-ply construction, where the internal fiber layers are arranged at an oblique angle. This structure results in high rolling resistance, increasing energy consumption during riding. High rolling resistance not only increases the difficulty of riding but also affects riding speed and efficiency.

[0005] Weak cushioning: The structure of bias-ply tires limits their cushioning capacity. During riding, uneven surfaces and potholes on the road generate impacts, causing significant vibration and discomfort to the rider. Bias-ply tires have relatively weak cushioning capabilities and cannot effectively absorb shocks, resulting in an uncomfortable riding experience.

[0006] Bias-ply tires may have only average grip performance in certain situations. On wet or rough surfaces, their grip and stability may be insufficient, making them prone to slipping and loss of control. This poses a certain risk to the rider's safety.

[0007] Relatively shorter lifespan: Due to structural limitations, bias-ply tires have relatively lower wear resistance and shear strength. During prolonged riding, bias-ply tires are prone to wear and deformation, resulting in a relatively short lifespan. This means riders need to replace tires frequently, increasing maintenance costs and inconvenience. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a radial bicycle pneumatic tire and its manufacturing process, which solves the problems of high rolling resistance, weak cushioning capacity, mediocre adhesion performance, and relatively short service life of existing bicycle pneumatic tires.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a radial bicycle pneumatic tire, comprising the following components by weight percentage: 30%-55% natural rubber, 13%-25% synthetic rubber, 2%-7% carbon nanotubes, 5%-9% diethylene vulcanizate, 3%-6% propylene glycol diisobutyrate, 2%-4% dibutyl dithiocarbamate, 0.3%-0.8% UV stabilizer, 1%-5% crack inhibitor, 2%-3.7% waterproofing agent, and 1.5%-2.6% diethylene vulcanizate.

[0010] Preferably, the UV stabilizer is titanium dioxide, the crack inhibitor is benzothiadiazole thione, and the waterproofing agent is a silane coupling agent.

[0011] Preferably, the titanium dioxide content is 0.6%-1.8% by mass; the benzothiadiazole thion content is 2%-3% by mass; and the silane coupling agent content is 0.2%-0.6% by mass.

[0012] A method for manufacturing a radial bicycle pneumatic tire includes the following steps:

[0013] S10. Materials to be prepared: natural rubber, synthetic rubber, carbon nanotubes, diethylene vulcanizate, propylene glycol diisobutyrate, dibutyl dithiocarbamate, titanium dioxide, benzothiazolyl thione, silane coupling agent, diethylene vulcanizate.

[0014] S20, Melting and Mixing: Natural rubber, synthetic rubber, carbon nanotubes, divinyl chloride, propylene glycol diisobutyrate, and dibutyl dithiocarbamate are placed in a furnace and melted. During the melting process, the solution is stirred with a stirrer. After stirring for 15 min to 36 min, titanium dioxide, benzothiadiazole thione, and silane coupling agent are added in sequence and stirred again to obtain melt A.

[0015] S30. Vulcanization treatment: Pour the molten material A into the mold inside the vulcanizing machine for vulcanization treatment. After observing the formation of a cross-linked structure inside the molten material A, molten material B is obtained.

[0016] S40, Shaping: Place the molten material B into a bicycle tire mold, and place it in a sealed box filled with inert gas for cooling and shaping to obtain a rubber tire;

[0017] S50, Tread Engraving: The rubber tire is placed in the tread engraving machine for engraving. According to the preset engraving lines, the radial shape is engraved on the outer wall of the tire to obtain a radial tire.

[0018] S60. Storage: Conduct quality inspections on the molded tires and store radial tires in a dark environment.

[0019] Preferably, in step S20, the heating temperature after adding natural rubber, synthetic rubber, carbon nanotubes, diethylene vulcanizate, propylene glycol diisobutyrate, and dibutyl dithiocarbamate to the furnace is 120°C to 160°C, and the heating time is 60 min to 90 min.

[0020] Preferably, in step S20, the heating temperature for adding titanium dioxide, benzothiadiazole thione, and silane coupling agent is 160°C to 220°C, and the heating time is 10 min to 15 min.

[0021] Preferably, in step S30, the vulcanizing machine temperature is set to 140℃~180℃, and the vulcanizing time is 10min~60min.

[0022] Preferably, the inert gas used in step S40 is a mixture of argon and nitrogen in a ratio of 3:1.

[0023] Preferably, in step S50, the engraving machine uses a U-shaped cutter to engrave the meridian shape.

[0024] Preferably, in step S20, the stirring speed of the furnace after adding natural rubber, synthetic rubber, carbon nanotubes, divinyl disulfide, propylene glycol diisobutyrate, and dibutyl dithiocarbamate is 50 rpm to 150 rpm; and the stirring speed of the furnace after adding titanium dioxide, benzothiadiazole thionone, and silane coupling agent in step S20 is 220 rpm to 260 rpm.

[0025] This invention provides a radial bicycle pneumatic tire and its manufacturing process. It has the following beneficial effects:

[0026] 1. This invention utilizes the radial tire structure, which, due to its design features, possesses superior wear resistance and shear strength. In contrast, bias-ply tires have a relatively shorter lifespan. The long lifespan characteristic of radial bicycle pneumatic tires reduces the frequency and cost of tire replacements, providing a more economical and reliable option.

[0027] 2. This invention, by optimizing process parameters such as material ratio, heating temperature, and tool selection, can obtain radial bicycle pneumatic tires with excellent quality and performance. The optimized tires exhibit higher wear resistance, burst resistance, skid resistance, shear resistance, and fatigue resistance, providing a better user experience and safety performance.

[0028] 3. This invention significantly improves the wear resistance of tires by adding wear-resistant materials such as carbon nanotubes, adjusting the material ratio and heating temperature, and optimizing the preparation process. This means that tires experience less wear over long-term use, have a longer lifespan, and reduce the frequency and cost of tire replacements. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the process steps of the present invention. Detailed Implementation

[0030] 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.

[0031] Please see the appendix Figure 1 Example 1:

[0032] Manufacturing process of radial bicycle pneumatic tires

[0033] S10. Materials to be prepared: natural rubber (40%), synthetic rubber (20%), carbon nanotubes (5%), diethylene vulcanizate (7%), propylene glycol diisobutyrate (4%), dibutyl dithiocarbamate (3%), titanium dioxide (1.5%), benzothiadiazole thione (2.5%), silane coupling agent (0.4%), diethylene vulcanizate (2%).

[0034] S20. Melting and mixing: Place natural rubber, synthetic rubber, carbon nanotubes, diethylene vulcanizate, propylene glycol diisobutyrate, and dibutyl dithiocarbamate into a furnace and heat to 150°C. Stir for 15 minutes at 100 rpm.

[0035] S30, Additives: Add titanium dioxide, benzothiadiazole thione, and silane coupling agent in sequence, and continue stirring for 5 minutes.

[0036] S40. Vulcanization treatment: Pour the mixture into the vulcanizing machine, set the temperature to 160℃, and the vulcanization treatment time to 30 minutes.

[0037] S50. Shaping: Place the vulcanized material into a bicycle tire mold, put it in a sealed box, and inject a mixture of argon and nitrogen gas (3:1) for cooling and shaping. The cooling time is 2 hours.

[0038] S60, Tread Engraving: Place the rubber tire in the tread engraving machine and use a U-shaped cutter to engrave the meridian shape.

[0039] S70. Storage: Conduct quality inspections on the molded tires and store the radial tires in a dark environment.

[0040] In summary, this embodiment utilizes a blend of natural and synthetic rubber, with additives such as carbon nanotubes, and employs vulcanization and shaping processes to prepare a radial bicycle pneumatic tire. The radial pattern is created using a U-shaped tool. This manufacturing process yields tires with excellent quality and performance.

[0041] Example 2:

[0042] Manufacturing process of radial bicycle pneumatic tires

[0043] S10. Materials to be prepared: natural rubber (35%), synthetic rubber (15%), carbon nanotubes (7%), diethylene vulcanizate (9%), propylene glycol diisobutyrate (6%), dibutyl dithiocarbamate (4%), titanium dioxide (1.8%), benzothiadiazole thione (2.8%), silane coupling agent (0.5%), diethylene vulcanizate (2.6%).

[0044] S20. Melting and mixing: Place natural rubber, synthetic rubber, carbon nanotubes, divinyl chloride, propylene glycol diisobutyrate, and dibutyl dithiocarbamate into a furnace and heat to 140°C. Stir at 80 rpm for 20 minutes.

[0045] S30, Additives: Add titanium dioxide, benzothiadiazole thione, and silane coupling agent in sequence, and continue stirring for 8 minutes.

[0046] S40. Vulcanization treatment: Pour the mixture into the vulcanizing machine, set the temperature to 170℃, and the vulcanization treatment time to 40 minutes.

[0047] S50. Shaping: The vulcanized material is placed in a bicycle tire mold, placed in a sealed box, and injected with a mixture of argon and nitrogen gas (3:1) for cooling and shaping. The cooling time is 3 hours.

[0048] S60, Tread Engraving: Place the rubber tire in the tread engraving machine and use a V-shaped cutter to engrave the tread.

[0049] S70. Storage: Conduct quality inspections on the molded tires and store the radial tires in a dark environment.

[0050] In summary, this embodiment adjusted the material ratio and heating temperature, and used different types of cutting tools to engrave the tire tread. By optimizing the manufacturing process, a radial bicycle pneumatic tire meeting specific requirements was obtained.

[0051] Example 3:

[0052] Manufacturing process of radial bicycle pneumatic tires

[0053] S10. Materials to be prepared: natural rubber (55%), synthetic rubber (25%), carbon nanotubes (2%), diethylene vulcanizate (5%), propylene glycol diisobutyrate (3%), dibutyl dithiocarbamate (2%), titanium dioxide (1.2%), benzothiadiazole thione (2.2%), silane coupling agent (0.3%), diethylene vulcanizate (2.4%).

[0054] S20. Melting and mixing: Place natural rubber, synthetic rubber, carbon nanotubes, divinyl chloride, propylene glycol diisobutyrate, and dibutyl dithiocarbamate into a furnace and heat to 160°C. Stir at 120 rpm for 25 minutes.

[0055] S30, Additives: Add titanium dioxide, benzothiadiazole thione, and silane coupling agent in sequence, and continue stirring for 10 minutes.

[0056] S40. Vulcanization treatment: Pour the mixture into the vulcanizing machine, set the temperature to 180℃, and the vulcanization treatment time to 50 minutes.

[0057] S50. Shaping: The vulcanized material is placed in a bicycle tire mold, placed in a sealed box, and injected with a mixture of argon and nitrogen gas (3:1) for cooling and shaping. The cooling time is 4 hours.

[0058] S60, Tread Engraving: Place the rubber tire in the tread engraving machine and use a circular cutter to engrave the tread.

[0059] S70. Storage: Conduct quality inspections on the molded tires and store the radial tires in a dark environment.

[0060] In summary, this embodiment adjusted the material ratio and heating temperature, and used different types of cutting tools to engrave the tire tread. By optimizing the manufacturing process, radial bicycle pneumatic tires with different properties were obtained.

[0061] Example 4:

[0062] Manufacturing process of radial bicycle pneumatic tires

[0063] S10. Materials to be prepared: natural rubber (30%), synthetic rubber (13%), carbon nanotubes (7%), diethylene vulcanizate (9%), propylene glycol diisobutyrate (6%), dibutyl dithiocarbamate (4%), titanium dioxide (1.8%), benzothiadiazole thione (2.8%), silane coupling agent (0.5%), diethylene vulcanizate (2.6%).

[0064] S20. Melting and mixing: Place natural rubber, synthetic rubber, carbon nanotubes, divinyl chloride, propylene glycol diisobutyrate, and dibutyl dithiocarbamate into a furnace and heat to 140°C. Stir at 80 rpm for 20 minutes.

[0065] S30, Additives: Add titanium dioxide, benzothiadiazole thione, and silane coupling agent in sequence, and continue stirring for 8 minutes.

[0066] S40. Vulcanization treatment: Pour the mixture into the vulcanizing machine, set the temperature to 170℃, and the vulcanization treatment time to 40 minutes.

[0067] S50. Shaping: The vulcanized material is placed in a bicycle tire mold, placed in a sealed box, and injected with a mixture of argon and nitrogen gas (3:1) for cooling and shaping. The cooling time is 3 hours.

[0068] S60, Tread Engraving: Place the rubber tire in the tread engraving machine and use a V-shaped cutter to engrave the tread.

[0069] S70. Storage: Conduct quality inspections on the molded tires and store the radial tires in a dark environment.

[0070] In summary, this embodiment adjusted the material ratio and heating temperature, and used different types of cutting tools to engrave the tire tread. By optimizing the manufacturing process, radial bicycle pneumatic tires with different properties were obtained.

[0071] Example 5:

[0072] Manufacturing process of radial bicycle pneumatic tires

[0073] S10. Materials to be prepared: natural rubber (45%), synthetic rubber (18%), carbon nanotubes (4%), diethylene vulcanizate (8%), propylene glycol diisobutyrate (5%), dibutyl dithiocarbamate (3%), titanium dioxide (1.6%), benzothiadiazole thione (2.3%), silane coupling agent (0.6%), diethylene vulcanizate (2.2%).

[0074] S20. Melting and mixing: Place natural rubber, synthetic rubber, carbon nanotubes, divinyl chloride, propylene glycol diisobutyrate, and dibutyl dithiocarbamate into a furnace and heat to 150°C. Stir at 120 rpm for 30 minutes.

[0075] S30, Additives: Add titanium dioxide, benzothiadiazole thione, and silane coupling agent in sequence, and continue stirring for 12 minutes.

[0076] S40. Vulcanization treatment: Pour the mixture into the vulcanizing machine, set the temperature to 180℃, and the vulcanization treatment time to 60 minutes.

[0077] S50. Shaping: The vulcanized material is placed in a bicycle tire mold, placed in a sealed box, and injected with a mixture of argon and nitrogen gas (3:1) for cooling and shaping. The cooling time is 4 hours.

[0078] S60, Tread Engraving: Place the rubber tire in the tread engraving machine and use a circular cutter to engrave the tread.

[0079] S70. Storage: Conduct quality inspections on the molded tires and store the radial tires in a dark environment.

[0080] In summary, this embodiment adjusted the material ratio and heating temperature, and used different types of cutting tools to engrave the tire tread. By optimizing the manufacturing process, radial bicycle pneumatic tires with different properties were obtained.

[0081] Tests and Data: The following tests were conducted, and the relevant data were recorded:

[0082] 1. Abrasion resistance test: Abrasion resistance tests were conducted on five radial bicycle pneumatic tires using a standard abrasion tester, and the abrasion loss (in terms of weight loss) of each tire was recorded.

[0083] 2. Bursting resistance test: The bursting resistance of five radial bicycle pneumatic tires was tested using a bursting test machine, and the burst pressure of each tire was recorded.

[0084] 3. Anti-skid performance test: Braking tests were conducted on wet and slippery surfaces, and the braking distances of the pneumatic tires of five radial bicycles were recorded.

[0085] 4. Shear resistance test: The shear resistance of five radial bicycle pneumatic tires was tested using a shear testing machine, and the shear strength of each tire was recorded.

[0086] 5. Fatigue performance test: Under simulated actual use conditions, fatigue performance tests were conducted on five radial bicycle pneumatic tires, and the service life of each tire was recorded.

[0087] Below is a data table from the test experiment:

[0088]

[0089] Comparative experimental design:

[0090] 1. The effect of different tool types on tire tread effect: V-shaped tools and U-shaped tools were used to carve tire tread on radial bicycle pneumatic tires to compare the effect of different tool types on tire tread effect.

[0091] 2. Effect of different carbon nanotube contents on tire performance: Tires were prepared by adjusting the carbon nanotube content, and their wear resistance, burst resistance and anti-skid performance were tested to compare the effects of different contents on tire performance.

[0092] 3. Effects of different vulcanization temperatures on tire performance: Adjust the vulcanization temperature, prepare tires and test their shear resistance and fatigue resistance, and compare the effects of different vulcanization temperatures on tire performance.

[0093] Below is a data table of the comparative experiment:

[0094] 1. The Influence of Different Tool Types on Tread Pattern Effect

[0095] Experiment Name U-shaped cutter V-shaped cutter Tread pattern clarity rating 8.5 9.2 Tread depth (mm) 3.6 3.8 Consistency of tread pattern high middle Tire tread quality consistency high middle

[0096] 2. The effect of different carbon nanotube contents on tire performance

[0097]

[0098] 3. The effect of different vulcanization temperatures on tire performance

[0099]

[0100]

[0101] Summary:

[0102] Through testing and comparative experiments on five types of radial bicycle pneumatic tires with significantly different manufacturing processes, the following conclusions were drawn:

[0103] 1. Optimized manufacturing process for radial bicycle pneumatic tires can produce tires with good quality and performance, including wear resistance, burst resistance, skid resistance, shear resistance and fatigue resistance.

[0104] 2. The type of cutting tool has a significant impact on the tread pattern. U-shaped cutting tools can produce tread patterns with higher clarity, while V-shaped cutting tools can produce deeper tread patterns.

[0105] 3. Adjusting the carbon nanotube content affects tire performance; adding an appropriate amount of carbon nanotubes can improve wear resistance and burst resistance.

[0106] 4. Adjusting the vulcanization temperature affects tire performance; appropriately increasing the vulcanization temperature can improve shear resistance and fatigue resistance.

[0107] 5. The optimized manufacturing process for radial bicycle pneumatic tires is flexible and adjustable, allowing for adjustments to parameters such as material ratios, heating temperatures, and tool selection to meet different performance requirements.

[0108] By comprehensively considering material ratios, processing technology, and experimental data, this radial bicycle pneumatic tire and its manufacturing process have the advantages of good wear resistance, high burst resistance, excellent anti-skid performance, strong shear resistance, and excellent fatigue resistance.

[0109] 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 method for manufacturing a radial bicycle pneumatic tire, characterized in that, Includes the following steps: S10. Materials Preparation: By weight percentage, natural rubber 30%-55%, synthetic rubber 13%-25%, carbon nanotubes 2%-7%, divinyl chloride 5%-9%, propylene glycol diisobutyrate 3%-6%, dibutyl dithiocarbamate 2%-4%, titanium dioxide 0.3%-0.8%, benzothiadiazole thion 1%-5%, silane coupling agent 2%-3.7%; S20, Melting and Mixing: Natural rubber, synthetic rubber, carbon nanotubes, divinyl chloride, propylene glycol diisobutyrate, and dibutyl dithiocarbamate are placed in a furnace and melted. During the melting process, the solution is stirred with a stirrer. After stirring for 15 to 36 minutes, titanium dioxide, benzothiadiazole thione, and silane coupling agent are added in sequence and stirred again to obtain melt A. S30. Vulcanization treatment: Pour the molten material A into the mold inside the vulcanizing machine for vulcanization treatment. After observing the formation of a cross-linked structure inside the molten material A, molten material B is obtained. In step S30, the vulcanizing machine temperature is set to 140℃~180℃, and the vulcanization treatment time is 10min~60min. S40, Shaping: Place the molten material B into a bicycle tire mold, and place it in a sealed box filled with inert gas for cooling and shaping to obtain a rubber tire; S50, Tread Engraving: The rubber tire is placed in the tread engraving machine for engraving. According to the preset engraving lines, the radial shape is engraved on the outer wall of the tire to obtain a radial tire. S60. Storage: Conduct quality inspections on the molded tires and store the radial tires in a dark environment.

2. The method for manufacturing a radial bicycle pneumatic tire according to claim 1, characterized in that, The titanium dioxide has a mass percentage of 0.6%-0.8%; the benzothiadiazole thion has a mass percentage of 2%-3%.

3. The method for manufacturing a radial bicycle pneumatic tire according to claim 1, characterized in that, In step S20, the heating temperature after adding natural rubber, synthetic rubber, carbon nanotubes, diethylene vulcanizate, propylene glycol diisobutyrate, and dibutyl dithiocarbamate to the furnace is 120℃~160℃, and the heating time is 60min~90min.

4. The method for manufacturing a radial bicycle pneumatic tire according to claim 1, characterized in that, In step S20, the heating temperature for adding titanium dioxide, benzothiadiazole thione, and silane coupling agent is 160℃~220℃, and the heating time is 10min~15min.

5. The method for manufacturing a radial bicycle pneumatic tire according to claim 1, characterized in that, The inert gas used in step S40 is a mixture of argon and nitrogen in a ratio of 3:

1.

6. The method for manufacturing a radial bicycle pneumatic tire according to claim 1, characterized in that, In step S50, the engraving machine uses a U-shaped cutter to engrave the meridian shape.

7. The method for manufacturing a radial bicycle pneumatic tire according to claim 1, characterized in that, In step S20, the stirring speed of the furnace after adding natural rubber, synthetic rubber, carbon nanotubes, divinyl disulfide, propylene glycol diisobutyrate, and dibutyl dithiocarbamate is 50 rpm to 150 rpm; after adding titanium dioxide, benzothiadiazole thionone, and silane coupling agent in step S20, the stirring speed of the furnace is 220 rpm to 260 rpm.

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