Inner tube tire inner rubber material with high renewable cycle material ratio and manufacturing method thereof

Abstract

The application discloses a high-proportion renewable recycling material inner tube tire inner tube rubber and a manufacturing method thereof, and belongs to the field of tire inner tube rubber. The formula is as follows in terms of weight parts: natural rubber 85-95 parts, styrene-butadiene rubber 5-15 parts, recycled rubber 300-350 parts, thermal-cracking recycled carbon black 50-60 parts, virgin carbon black 10-20 parts, zinc oxide and stearic acid 8-10 parts, antioxidant 4020 and protective wax 2-5 parts, aromatic oil 25-30 parts, accelerator 2-5 parts, sulfur 5-10 parts, and resin 2-5 parts. The high-proportion recycled rubber can be applied to the inner tube rubber, so that the recycling rate of waste tires is improved, and the wear and puncture of the inner tube of the outer tire, hard components and the like are avoided.

Description

Technical Field

[0001] This invention relates to the field of tire lining rubber, specifically to a high-percentage renewable and recyclable material for inner tube tire lining rubber and its manufacturing method. Background Technology

[0002] Waste tires are bulky, and to improve recycling rates, they are often recycled and combined with natural rubber for continued use in tire manufacturing. This not only reduces the consumption of natural rubber and lowers tire costs, but also avoids environmental pollution caused by waste tire disposal.

[0003] The inner tube of an inner tube tire has lower performance requirements due to the inner tube on the inside and the tread rubber on the outside. The inner tube accounts for approximately 5%-10% of the total tire weight, primarily to prevent wear on the outer tire's ply and hard components. Currently, it is generally made of natural and synthetic rubber. Because of its lower proportion, its cost is also lower than that of the tread rubber. Although the inner tube accounts for less than the tread rubber (which makes up 65%-70% of the total tire weight), its consumption is still substantial in the long run. Furthermore, during the production of the inner tube, both natural and synthetic rubber significantly affect the Mooney viscosity, leading to issues like roller sticking and scorching. Since the inner tube is used for ply bonding, scorching must be avoided; however, controlling the mixing process in actual production is very difficult.

[0004] In view of the problems existing in the prior art, the present invention designs and manufactures a high proportion of renewable and recyclable material inner tube tire rubber compound and its manufacturing method to overcome the above defects. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a high-proportion recyclable material for inner tube tires and its manufacturing method, which can apply a high proportion of recycled rubber to the tire inner tube, not only improving the recycling rate of waste tires, but also avoiding wear and tear on the outer tire cords and hard components, and puncture of the inner tube.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a high-proportion renewable and recyclable material is an inner tube tire lining compound, the formulation ratio by weight is as follows: 85-95 parts natural rubber, 5-15 parts styrene-butadiene rubber, 300-350 parts reclaimed rubber, 50-60 parts pyrolysis recycled carbon black, 10-20 parts virgin carbon black, 8-10 parts zinc oxide and stearic acid, 2-5 parts antioxidant 4020 and protective wax, 25-30 parts aromatic oil, 2-5 parts accelerator, 5-10 parts sulfur, and 2-5 parts resin.

[0007] Preferably, the recycled rubber is environmentally friendly recycled rubber.

[0008] Preferably, the proportion of the recycled rubber and the pyrolysis recycled carbon black is 64%-74%.

[0009] Preferably, the total number of parts of natural rubber and styrene-butadiene rubber is 100 parts.

[0010] Preferably, the virgin carbon black is 330 carbon black.

[0011] Preferably, the accelerator is accelerator CBS or accelerator DM.

[0012] A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: (1). First stage of mixing: Natural rubber, styrene-butadiene rubber, reclaimed rubber, pyrolysis reclaimed carbon black, virgin carbon black, zinc oxide and stearic acid, antioxidant 4020 and protective wax, aromatic oil are put into a mixer for thorough mixing. The mixing time is 3-5 minutes. The mixed rubber is left to stand in the outside for 12-20 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add sulfur, accelerator and resin to mix thoroughly for 1-3 minutes. After mixing, place the mixed rubber in the outside environment for 12-20 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4) Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. The tire is vulcanized by mold, maintaining a certain pressure, temperature and time.

[0013] Preferably, in step (4), the pressure is 1.8-2.4 MPa, the temperature is 146-150℃, and the time is 100-150 min.

[0014] The advantages of this invention are: 1. This invention utilizes pyrolysis recycled carbon black to largely replace virgin carbon black. It retains some structural characteristics of virgin carbon black, filling the gaps between rubber molecular chains to improve the hardness, tensile strength, and abrasion resistance of the vulcanizate. Although its reinforcing effect is weaker than virgin carbon black, its performance perfectly meets the requirements for use in tire inner rubber. Furthermore, since the raw material for pyrolysis recycled carbon black is waste tires, its production cost is lower than that of virgin carbon black. In addition, pyrolysis recycled carbon black can optimize the Mooney viscosity of the rubber compound, improve the mixing fluidity of the compound in the internal mixer, reduce the probability of the compound sticking to the rollers and scorching, and make the mixing process easier to control.

[0015] 2. The present invention contains 60%-70% recycled rubber and pyrolysis recycled carbon black, which solves the problem of black pollution from waste, reduces dependence on virgin rubber resources and virgin carbon black, avoids soil / water pollution caused by open-air accumulation of waste tires, and avoids toxic gases such as dioxins released by incineration. Moreover, compared with the production of virgin rubber, the production of recycled rubber has lower energy consumption and carbon emissions. The raw materials are recycled from waste tires, and the production cost is only 50%-70% of that of virgin natural rubber, which can directly reduce the raw material cost of rubber products. Detailed Implementation

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below. Example 1

[0017] A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: Component ratio by weight: (1). First stage of mixing: 95 parts of natural rubber, 5 parts of styrene-butadiene rubber, 300 parts of reclaimed rubber, 50 parts of pyrolysis reclaimed carbon black, 20 parts of virgin carbon black, 8 parts of zinc oxide and stearic acid, 5 parts of antioxidant 4020 and protective wax, and 30 parts of aromatic oil are put into an internal mixer for thorough mixing. The mixing time is 3 minutes. The mixed rubber is then left to stand in the outside environment for 12 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add 2 parts of accelerator CBS, 5 parts of sulfur and 2 parts of resin. Mix thoroughly for 1 minute. Then place the mixed rubber in the outside environment for 12 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4). Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. It is vulcanized through a mold, maintaining a certain pressure, temperature and time. Specifically, the pressure is 2.0 MPa, the temperature is 146℃ and the time is 100 min, and it is vulcanized into a tire. Example 2

[0018] A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: Component ratio by weight: (1). First stage of mixing: 95 parts of natural rubber, 5 parts of styrene-butadiene rubber, 300 parts of reclaimed rubber, 55 parts of pyrolysis reclaimed carbon black, 15 parts of virgin carbon black, 10 parts of zinc oxide and stearic acid, 4 parts of antioxidant 4020 and protective wax, and 25 parts of aromatic oil are put into an internal mixer for thorough mixing. The mixing time is 4 minutes. The mixed rubber is then left to stand in the outside environment for 12 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add 2 parts of accelerator CBS, 5 parts of sulfur and 4 parts of resin. Mix thoroughly for 1.5 minutes. After mixing, place the mixed rubber in the outside environment for 12 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4) Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. It is vulcanized through a mold, maintaining a certain pressure, temperature and time. Specifically, the pressure is 1.8 MPa, the temperature is 147℃ and the time is 120 min, and it is vulcanized into a tire. Example 3

[0019] A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: Component ratio by weight: (1). First stage of mixing: 85 parts of natural rubber, 15 parts of styrene-butadiene rubber, 320 parts of reclaimed rubber, 60 parts of pyrolysis reclaimed carbon black, 10 parts of virgin carbon black, 9 parts of zinc oxide and stearic acid, 2 parts of antioxidant 4020 and protective wax, and 30 parts of aromatic oil are put into an internal mixer for thorough mixing. The mixing time is 5 minutes. The mixed rubber is then left to stand in the outside environment for 18 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add 5 parts of accelerator CBS, 10 parts of sulfur and 5 parts of resin. Mix thoroughly for 2 minutes. After mixing, place the mixed rubber in the outside environment for 18 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4). Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. It is vulcanized through a mold, maintaining a certain pressure, temperature and time. Specifically, the pressure is 2.0 MPa, the temperature is 150℃ and the time is 120 min, and it is vulcanized into a tire. Example 4

[0020] A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: Component ratio by weight: (1). First stage of mixing: 85 parts of natural rubber, 15 parts of styrene-butadiene rubber, 350 parts of reclaimed rubber, 60 parts of pyrolysis reclaimed carbon black, 10 parts of virgin carbon black, 10 parts of zinc oxide and stearic acid, 5 parts of antioxidant 4020 and protective wax, and 30 parts of aromatic oil are put into an internal mixer for thorough mixing. The mixing time is 5 minutes. The mixed rubber is then left to stand in the outside environment for 20 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add 5 parts of accelerator CBS, 10 parts of sulfur and 5 parts of resin. Mix thoroughly for 3 minutes. After mixing, place the mixed rubber in the outside environment for 20 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4) Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. It is vulcanized through a mold, maintaining a certain pressure, temperature and time. Specifically, the pressure is 2.4 MPa, the temperature is 150℃ and the time is 150 min, and it is vulcanized into a tire. Example 5

[0021] A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: Component ratio by weight: (1). First stage of mixing: 90 parts of natural rubber, 10 parts of styrene-butadiene rubber, 350 parts of reclaimed rubber, 60 parts of pyrolysis reclaimed carbon black, 10 parts of virgin carbon black, 10 parts of zinc oxide and stearic acid, 5 parts of antioxidant 4020 and protective wax, and 28 parts of aromatic oil are put into a mixer for thorough mixing. The mixing time is 5 minutes. The mixed rubber is then left to stand in the outside environment for 18 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add 4 parts of accelerator DM, 10 parts of sulfur and 5 parts of resin. Mix thoroughly for 3 minutes. Then place the mixed rubber in the outside environment for 18 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4) Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. It is vulcanized through a mold, maintaining a certain pressure, temperature and time. Specifically, the pressure is 2.4 MPa, the temperature is 150℃ and the time is 150 min, and it is vulcanized into a tire.

[0022] Comparative Example 1 A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, the specific steps of which are as follows: Component ratio by weight: (1). First stage of mixing: 400 parts of natural rubber and styrene-butadiene rubber, 50 parts of pyrolysis recycled carbon black, 20 parts of virgin carbon black, 10 parts of zinc oxide and stearic acid, 3 parts of antioxidant 4020 and protective wax, and 25 parts of aromatic oil are put into an internal mixer for thorough mixing. The mixing time is 3 minutes. The mixed rubber is then left to stand in the outside environment for 20 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add 2 parts of accelerator CBS, 5 parts of sulfur and 2 parts of resin. Mix thoroughly for 3 minutes. After mixing, place the mixed rubber in the outside environment for 20 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4) Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. It is vulcanized through a mold, maintaining a certain pressure, temperature and time. Specifically, the pressure is 2.4 MPa, the temperature is 150℃ and the time is 150 min, and it is vulcanized into a tire.

[0023] The properties of the tire rubber obtained in the examples and comparative examples were tested, and the results are shown in Table 1.

[0024] Table 1

[0025] As shown in Table 1, compared with the rubber compound of Comparative Example 1, the tire inner rubber prepared by Examples 1-5 of the present invention has lower hardness, strength, and elongation compared with Comparative Example 1. However, since it is used as tire inner rubber, it only needs to have an isolation function to prevent the tire cord and hard parts from being worn or punctured.

[0026] The actual cost of reclaimed rubber and pyrolysis recycled carbon black is only 50%-70% of that of natural rubber and virgin carbon black, and the cost of the tire inner rubber prepared in the examples is even lower. Moreover, pyrolysis recycled carbon black can optimize the Mooney viscosity of the rubber compound, improve the mixing fluidity of the rubber compound in the internal mixer, reduce the probability of the rubber compound sticking to the rollers and scorching, and make the mixing process easier to control.

[0027] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention. Furthermore, it should be understood that after reading the technical description of this invention, those skilled in the art can make various alterations, modifications, and / or variations to the invention, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A high-proportion renewable and recyclable material for inner tube tires, the formulation of which is as follows by weight: 85-95 parts natural rubber, 5-15 parts styrene-butadiene rubber, 300-350 parts reclaimed rubber, 50-60 parts pyrolysis recycled carbon black, 10-20 parts virgin carbon black, 8-10 parts zinc oxide and stearic acid, 2-5 parts antioxidant 4020 and protective wax, 25-30 parts aromatic oil, 2-5 parts accelerator, 5-10 parts sulfur, and 2-5 parts resin.

2. The high-percentage renewable and recyclable material for inner tube tires according to claim 1, characterized in that, The recycled rubber is environmentally friendly recycled rubber.

3. The high-percentage renewable and recyclable material according to claim 1, characterized in that, The proportion of reclaimed rubber and pyrolysis reclaimed carbon black is 64%-74%.

4. The high-percentage renewable and recyclable material for inner tube tires according to claim 1, characterized in that, The total number of parts of natural rubber and styrene-butadiene rubber is 100 parts.

5. The high-percentage recyclable material for inner tube tires according to claim 1, characterized in that, The virgin carbon black is 330 carbon black.

6. The high-percentage renewable and recyclable material for inner tube tires according to claim 1, characterized in that, The accelerator is either accelerator CBS or accelerator DM.

7. A method for preparing a high-percentage renewable and recyclable material inner tube tire compound, characterized in that: The specific steps are as follows: (1). First stage of mixing: Natural rubber, styrene-butadiene rubber, reclaimed rubber, pyrolysis reclaimed carbon black, virgin carbon black, zinc oxide and stearic acid, antioxidant 4020 and protective wax, aromatic oil are put into a mixer for thorough mixing. The mixing time is 3-5 minutes. The mixed rubber is left to stand in the outside for 12-20 hours. (2). Second stage mixing: Put the first stage mixed rubber into the internal mixer and add sulfur, accelerator and resin to mix thoroughly for 1-3 minutes. After mixing, place the mixed rubber in the outside environment for 12-20 hours. (3). Pre-forming: The two-stage mixed rubber compound is put into a two-roll mill for full hot refining, and then processed into a semi-finished product of a certain size and weight by a calender; (4) Vulcanization: The pre-formed semi-finished product is combined with the skeleton material and the tread to form a tire blank. The tire is vulcanized by mold, maintaining a certain pressure, temperature and time.

8. The method for preparing a high-percentage renewable and recyclable material inner tube tire compound according to claim 7, characterized in that, In step (4), the pressure is 1.8-2.4 MPa, the temperature is 146-150℃, and the time is 100-150 min.

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