Method for preparing tire transition layer by using waste tire recycled material

Abstract

The invention belongs to the technical field of tire production, and relates to a method for preparing a tire transition layer by using a waste tire regenerated material, which comprises the following steps: S1, cleaning and drying the waste tire regenerated material, and then further crushing and screening to obtain a regenerated rubber material; s2, determining a formula through a small-scale test, and premixing natural rubber, butadiene styrene rubber and the reclaimed rubber material to obtain a premixed rubber material; s3, carbon black and heavy naphthenic oil are added into the premixed rubber material for first-stage mixing, and first-stage mixed rubber is prepared; s4, an anti-aging agent and an adhesive are added into the first-stage rubber compound for second-stage mixing, and second-stage rubber compound is prepared; s5, sulfur and nickel boroacylate are added into the second-stage rubber compound for third-stage mixing, and finally the tire transition layer rubber material is obtained. According to the method, through formula design and process optimization, pollution of the waste tires to the environment is reduced, the using amount of natural rubber is reduced, sustainable development of the tires is promoted, and meanwhile it is guaranteed that the driving performance and safety of the tires are not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of tire production, and in particular relates to a method for preparing a tire transition layer by utilizing recycled materials from waste tires. Background Art

[0002] A tire consists of a tread, sidewalls, carcass, shoulder, and bead. The carcass, in turn, is comprised of the cord ply, transition layer, and innerliner. Therefore, studying the ratio of transition layer to innerliner rubber, a crucial component of a tire, is of great significance. As part of the tire carcass, the transition layer primarily enhances overall tire performance while balancing the tread and carcass. The strength and hardness of the transition layer are crucial to this balance. With the increasing number of vehicles on the road, from small cars to large transport vehicles and heavy-duty construction vehicles, the demand for tires is increasing. This creates a conflict between the dwindling supply of rubber raw materials and the increasing number of scrap tires. The disposal of scrap tires has become a challenging environmental issue, while at the same time, there is a shortage of raw materials for new tire production. Therefore, the scientific treatment of scrap tires is urgent, and utilizing scrap tires as a recycled material for tire production is imperative.

[0003] Currently, recycled waste tires are primarily used in tire treads and sidewalls, but not in transition layer formulations. This is because all-steel transition layer formulations require high performance and strong adhesion to the steel cord. Zinc oxide, as a vulcanization activator, primarily influences the rate of chemical crosslink formation, the type and number of crosslinks during the vulcanization process, and can increase the degree of crosslinking in vulcanized rubber. Zinc oxide has always played a crucial role in tire transition layers. The careless disposal of waste tires exacerbates the environmental pollution caused by zinc oxide. However, waste tires are currently only used in treads and sidewalls, and the reuse rate of recycled waste tire materials is still very limited. Therefore, there is an urgent need to accelerate the research and development of recycled waste tire materials for use in tire transition layers. Summary of the Invention

[0004] In response to the above situation, the present invention provides a method for preparing a tire transition layer using recycled materials from waste tires, aiming to promote the sustainable development of waste tires through formula design and process optimization measures, while ensuring that the tire's driving performance and safety are not affected.

[0005] In order to achieve the above objectives, the present invention provides a method for preparing a tire transition layer using recycled materials from waste tires, comprising the following steps:

[0006] S1. Pre-treating the recycled materials from waste tires by first cleaning and then drying them, and then further crushing and screening them to obtain recycled rubber;

[0007] S2. Determine the formula through a small test and redesign the formula process; in order to better disperse the rubber material, pre-mix the natural rubber, styrene-butadiene rubber and the recycled rubber material obtained in step S1 according to the weight ratio to obtain a pre-mixed rubber material;

[0008] S3, adding carbon black and heavy naphthenic oil according to the weight ratio to the premixed rubber material obtained in step S2, and performing a mixing step to prepare a first-stage mixed rubber;

[0009] S4, adding an antioxidant and a binder according to the weight ratio to the first-stage rubber mix prepared in step S3, and performing second-stage mixing to prepare a second-stage rubber mix;

[0010] S5, adding sulfur and nickel boroacylate according to the weight ratio to the two-stage mixed rubber prepared in step S4, and performing three-stage mixing to finally obtain a tire transition layer rubber material;

[0011] The components of the tire transition layer rubber material are formulated as follows by weight:

[0012] Natural rubber: 75-90 parts, styrene-butadiene rubber: 10-30 parts, recycled rubber: 15-25 parts, carbon black: 55-65 parts, heavy naphthenic oil: 5.5-7.5 parts, antioxidant: 3-4 parts, adhesive: 1-2 parts, sulfur: 1.5-2.5 parts, nickel boroacylate: 3.5-4.5 parts.

[0013] Preferably, the cleaning in step S1 is to put the waste tire recycled material into a water pool equipped with a stirrer for stirring and washing for 10 minutes, then take it out and let it air-dry naturally, then use a grinder to crush it, and use a vibrating screen to screen it to remove large particles of rubber in the recycled rubber.

[0014] Preferably, the styrene-butadiene rubber used in step S2 is SBR1502 styrene-butadiene rubber; and the pre-mixing is to put natural rubber, styrene-butadiene rubber and recycled rubber into a mixer and perform preliminary mixing for 15 minutes.

[0015] Preferably, the carbon black used in step S3 is N326 carbon black; the first stage mixing is to add carbon black and heavy naphthenic oil to the premixed rubber material in sequence, and then put them into an internal mixer for a first stage mixing, the internal mixer rotor speed is 55r / min, after mixing for 20min, the rubber is discharged at a temperature of 155-170°C to obtain a first stage mixed rubber.

[0016] Preferably, the antioxidant used in step S4 is 4020 antioxidant, and the adhesive used is FA608 adhesive; the second-stage mixing is to add the antioxidant and adhesive to the first-stage mixed rubber, and then put them into the internal mixer again for second-stage mixing, the internal mixer rotor speed is 45r / min, after mixing for 25 minutes, the glue is discharged at a temperature of 160-175°C to obtain the second-stage mixed rubber.

[0017] Preferably, in step S5, the three-stage mixing is to add sulfur and nickel boroacylate to the second-stage mixed rubber, and then put it into the internal mixer for three-stage mixing again. The internal mixer rotor speed is 35 r / min. After mixing for 30 minutes, the rubber is discharged at a temperature of 105-1115° C. to finally obtain the tire transition layer rubber material.

[0018] The present invention also includes other components that enable normal use, which are conventional means in the field. In addition, devices or components not limited in the present invention all adopt existing technologies in the field.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. Reduce environmental pollution: Utilize tire recycling resources to reduce the pollution of waste tires to the environment, reduce the use of natural rubber, and indirectly protect rubber trees.

[0021] 2. Reduce resource dependence: reduce the use of strategic materials, improve the sustainable development of waste tire recycling resources, and utilize waste tire recycling resources to ensure the safety of production materials.

[0022] 3. Improve production efficiency and reduce production costs: By updating equipment and optimizing production processes, production accuracy and efficiency have been improved and tire manufacturing costs have been reduced.

[0023] 4. Use nano zinc oxide, a nanomaterial with low zinc oxide content but higher activity, to replace traditional zinc oxide raw materials and reduce the pollution of zinc oxide to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flowchart of the method for preparing a tire transition layer using recycled materials from waste tires in the present invention. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0026] Example 1

[0027] The present invention provides a method for preparing a tire transition layer using recycled materials from waste tires, the purpose of which is to:

[0028] 1. Improve the utilization rate of recycled resources: Through comparative tests on several different types of recycled waste tire resources, we finally determined the application of one type of tire recycled resource.

[0029] 2. Reduce tire production costs: By reducing the use of strategic materials such as natural rubber and optimizing production processes, unnecessary material waste can be reduced and manufacturing costs can be lowered.

[0030] 3. Reduce the amount of zinc oxide used: Through experiments, nano zinc oxide, a nanomaterial with low zinc oxide content but higher activity, is used to replace traditional zinc oxide raw materials, thereby reducing the amount of zinc oxide used and the pollution to the environment.

[0031] 4. Meet new market demands: Promote the reuse of waste tires as renewable resources, reduce the pollution of waste tires to the environment, and reduce strategic dependence on natural rubber.

[0032] like Figure 1 As shown, the method for preparing a tire transition layer using recycled materials from waste tires provided by the present invention comprises the following specific steps:

[0033] S1. Pre-treating the recycled materials from waste tires, placing them in a water pool equipped with a stirrer for stirring and washing for 10 minutes, then removing them and air-drying them naturally, then crushing them using a grinder and screening them using a vibrating screen to remove large particles of rubber in the recycled rubber to obtain recycled rubber;

[0034] S2. Determine the formula through a small test to facilitate the use of the formula in the small test stage and redesign the formula process; in order to better disperse the rubber material, put the natural rubber, styrene-butadiene rubber and the recycled rubber material obtained in step S1 into a mixer according to the weight formula and pre-mix for 15 minutes to obtain a premixed rubber material;

[0035] S3, adding carbon black and heavy naphthenic oil according to the weight ratio to the premixed rubber material obtained in step S2, and then putting them into a GE320 type internal mixer for mixing at a rotor speed of 55 r / min for 20 minutes, and then performing debinding at a temperature of 155-170° C. to obtain a first-stage rubber mix;

[0036] S4, adding an antioxidant and a binder according to the weight ratio to the first-stage rubber mix prepared in step S3, and then putting them into an internal mixer for second-stage mixing again, with the internal mixer rotor speed being 45 r / min. After mixing for 25 minutes, the rubber mix was discharged at a temperature of 160-175° C. to obtain a second-stage rubber mix;

[0037] S5. Add sulfur and nickel boroacylate as accelerators according to the weight ratio to the second-stage rubber mix prepared in step S4, and put it into the internal mixer for three-stage mixing again. The internal mixer rotor speed is 35 r / min. After mixing for 30 minutes, the rubber is discharged at a temperature of 105-1115° C. to finally obtain a tire transition layer rubber material;

[0038] The components of the tire transition layer rubber material are formulated as follows by weight:

[0039] Natural rubber: 80 parts, styrene-butadiene rubber SBR1502: 20 parts, recycled rubber: 20 parts, carbon black N326: 60 parts, antioxidant 4020: 3.5 parts, adhesive FA608: 1.5 parts, heavy naphthenic oil: 6 parts, sulfur: 2 parts, nickel boroacylate: 3.75 parts.

[0040] This invention improves the utilization rate of recycled materials from scrap tires and reduces the amount of zinc oxide used in tire production, thereby promoting the sustainable development of tire materials and alleviating the environmental impact of scrap tires. Furthermore, it reduces the amount of zinc oxide used, thereby minimizing the environmental damage caused by scrap tires and the environmental pollution caused by zinc. It also reduces tire production costs, while ensuring tire safety, durability, and comfort. It also reduces the demand for natural rubber, alleviates resource dependence, enhances vehicle load capacity, meets the tire performance requirements of transport vehicles, and promotes the sustainable and friendly development of scrap tires.

[0041] The material properties of the tire transition layer rubber material prepared by the method of this embodiment are compared with those of the tire transition layer rubber material prepared in the prior art, as shown in Table 1 below:

[0042] Table 1

[0043]

[0044]

[0045] The finished drum test data of tires made using the tire transition layer rubber material obtained by the method of the present invention are shown in Table 2 below:

[0046] Table 2

[0047]

[0048] It can be seen that the present invention solves the problem of excessive dependence of tire production on natural rubber resources by recycling recycled materials from waste tires, while also ensuring the durability and high-speed performance of the tires.

[0049] Example 2

[0050] A method for preparing a tire transition layer using recycled materials from waste tires, comprising the following steps:

[0051] S1. Pre-treating the recycled materials from waste tires, placing them in a water pool equipped with a stirrer for stirring and washing for 10 minutes, then removing them and air-drying them naturally, then crushing them using a grinder and screening them using a vibrating screen to remove large particles of rubber in the recycled rubber to obtain recycled rubber;

[0052] S2. Determine the formula through a small test to facilitate the use of the formula in the small test stage and redesign the formula process; in order to better disperse the rubber material, put the natural rubber, styrene-butadiene rubber and the recycled rubber material obtained in step S1 into a mixer according to the weight formula and pre-mix for 15 minutes to obtain a premixed rubber material;

[0053] S3, adding carbon black and heavy naphthenic oil according to the weight ratio to the premixed rubber material obtained in step S2, and then putting them into a GE320 type internal mixer for mixing at a rotor speed of 55 r / min for 20 minutes, and then performing debinding at a temperature of 155-170° C. to obtain a first-stage rubber mix;

[0054] S4, adding an antioxidant and a binder according to the weight ratio to the first-stage rubber mix prepared in step S3, and then putting them into an internal mixer for second-stage mixing again, with the internal mixer rotor speed being 45 r / min. After mixing for 25 minutes, the rubber mix was discharged at a temperature of 160-175° C. to obtain a second-stage rubber mix;

[0055] S5. Add sulfur and nickel boroacylate according to the weight ratio to the second-stage rubber mix prepared in step S4, and put it into the internal mixer again for three-stage mixing. The internal mixer rotor speed is 35 r / min. After mixing for 30 minutes, the rubber is discharged at a temperature of 105-1115° C. to finally obtain a tire transition layer rubber material;

[0056] The components of the tire transition layer rubber material are formulated as follows by weight:

[0057] Natural rubber: 75 parts, styrene-butadiene rubber SBR1502: 30 parts, recycled rubber: 25 parts, carbon black N326: 55 parts, antioxidant 4020: 3 parts, adhesive FA608: 2 parts, heavy naphthenic oil: 5.5 parts, sulfur: 2.5 parts, nickel boroacylate: 3.5 parts.

[0058] To ensure that the products produced with the new formula do not affect the performance of the tire, the present invention improves the production yield rate by modifying the original production equipment; uses more advanced automated production equipment to accurately control the thickness and material distribution of various parts of the tire, ensuring that the tire can meet the requirements of high strength, high durability and high safety.

[0059] The material properties of the tire transition layer rubber material prepared by the method of this embodiment are compared with those of the tire transition layer rubber material prepared in the prior art, as shown in Table 3 below:

[0060] Table 3

[0061]

[0062]

[0063] Example 3

[0064] A method for preparing a tire transition layer using recycled materials from waste tires, comprising the following steps:

[0065] S1. Pre-treating the recycled materials from waste tires, placing them in a water pool equipped with a stirrer for stirring and washing for 10 minutes, then removing them and air-drying them naturally, then crushing them using a grinder and screening them using a vibrating screen to remove large particles of rubber in the recycled rubber to obtain recycled rubber;

[0066] S2. Determine the formula through a small test to facilitate the use of the formula in the small test stage and redesign the formula process; in order to better disperse the rubber material, put the natural rubber, styrene-butadiene rubber and the recycled rubber material obtained in step S1 into a mixer according to the weight formula and pre-mix for 15 minutes to obtain a premixed rubber material;

[0067] S3, adding carbon black and heavy naphthenic oil according to the weight ratio to the premixed rubber material obtained in step S2, and then putting them into a GE320 type internal mixer for mixing at a rotor speed of 55 r / min for 20 minutes, and then performing debinding at a temperature of 155-170° C. to obtain a first-stage rubber mix;

[0068] S4, adding an antioxidant and a binder according to the weight ratio to the first-stage rubber mix prepared in step S3, and then putting them into an internal mixer for second-stage mixing again, with the internal mixer rotor speed being 45 r / min. After mixing for 25 minutes, the rubber mix was discharged at a temperature of 160-175° C. to obtain a second-stage rubber mix;

[0069] S5. Add sulfur and nickel boroacylate according to the weight ratio to the second-stage rubber mix prepared in step S4, and put it into the internal mixer again for three-stage mixing. The internal mixer rotor speed is 35 r / min. After mixing for 30 minutes, the rubber is discharged at a temperature of 105-1115° C. to finally obtain a tire transition layer rubber material;

[0070] The components of the tire transition layer rubber material are formulated as follows by weight:

[0071] Natural rubber: 90 parts, styrene-butadiene rubber SBR1502: 10 parts, recycled rubber: 15 parts, carbon black N326: 65 parts, antioxidant 4020: 4 parts, adhesive FA608: 1 part, heavy naphthenic oil: 7.5 parts, sulfur: 1.5 parts, nickel boroacylate: 4.5 parts.

[0072] The material properties of the tire transition layer rubber material prepared by the method of this embodiment are compared with those of the tire transition layer rubber material prepared in the prior art, as shown in Table 4 below:

[0073] Table 4

[0074]

[0075]

[0076] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the scope of protection of the present invention.

Claims

1. A method for preparing a tire transition layer using recycled materials from waste tires, characterized in that: Here are the steps: S1, washing and drying the recycled materials from waste tires, and then further crushing and screening them to obtain recycled rubber; S2. Determine the formula through a small test, and then pre-mix the natural rubber, styrene-butadiene rubber and the recycled rubber obtained in step S1 according to the formula in parts by weight to obtain a premixed rubber; S3, adding carbon black and heavy naphthenic oil according to the weight ratio to the premixed rubber material obtained in step S2, and performing a mixing step to prepare a first-stage mixed rubber; S4, adding an antioxidant and a binder according to the weight ratio to the first-stage rubber mix prepared in step S3, and performing second-stage mixing to prepare a second-stage rubber mix; S5, adding sulfur and nickel boroacylate according to the weight ratio to the two-stage mixed rubber prepared in step S4, and performing three-stage mixing to finally obtain a tire transition layer rubber material; The components of the tire transition layer rubber material are formulated as follows by weight: Natural rubber: 75-90 parts, styrene-butadiene rubber: 10-30 parts, recycled rubber: 15-25 parts, carbon black: 55-65 parts, heavy naphthenic oil: 5.5-7.5 parts, antioxidant: 3-4 parts, adhesive: 1-2 parts, sulfur: 1.5-2.5 parts, nickel boroacylate: 3.5-4.5 parts.

2. The method for preparing a tire transition layer using recycled materials from waste tires according to claim 1, characterized in that: In step S1, the waste tire recycled material is put into a water pool equipped with a stirrer for stirring and washing for 10 minutes, then taken out and naturally air-dried, and then crushed with a grinder and sieved with a vibrating screen to remove large particles of rubber in the recycled rubber.

3. The method for preparing a tire transition layer using recycled materials from waste tires according to claim 1, characterized in that: In step S2, the styrene butadiene rubber used is SBR1502 styrene butadiene rubber; the pre-mixing is to put natural rubber, styrene butadiene rubber and recycled rubber into a mixer and perform preliminary mixing for 15 minutes.

4. The method for preparing a tire transition layer using recycled materials from waste tires according to claim 1, characterized in that: In step S3, the carbon black used is N326 carbon black; the first stage mixing is to add carbon black and heavy naphthenic oil to the premixed rubber material in sequence, and then put them into the internal mixer for a stage mixing. The internal mixer rotor speed is 55r / min. After mixing for 20 minutes, the rubber is discharged at a temperature of 155-170°C to obtain a first stage mixed rubber.

5. The method for preparing a tire transition layer using recycled materials from waste tires according to claim 1, characterized in that: In step S4, the antioxidant used is 4020 antioxidant, and the adhesive used is FA608 adhesive; the second-stage mixing is to add the antioxidant and adhesive to the first-stage mixed rubber, and then put them into the internal mixer again for second-stage mixing. The internal mixer rotor speed is 45r / min. After mixing for 25 minutes, the rubber is discharged at a temperature of 160-175°C to obtain the second-stage mixed rubber.

6. The method for preparing a tire transition layer using recycled materials from waste tires according to claim 1, characterized in that: In step S5, the three-stage mixing is to add sulfur and nickel boroacylate to the second-stage mixed rubber, and then put it into the internal mixer for three-stage mixing. The internal mixer rotor speed is 35 r / min. After mixing for 30 minutes, the rubber is discharged at a temperature of 105-1115°C to finally obtain the tire transition layer rubber material.

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