Aviation radial tire tread rubber material and tire

Abstract

The invention relates to the technical field of tire processing, particularly discloses an aviation radial tire tread rubber material and a tire, and aims to solve the problem that imported smoked sheet rubber in an existing tire cannot be replaced. The high-specific-surface-area wear-resistant rubber composition comprises, by weight, 1-100 phr of super-polymerized natural rubber, 40-60 phr of fine-particle high-specific-surface-area wear-resistant carbon black, 1-5 phr of a multifunctional cross-linking agent and 0.2-2.5 phr of a low-heat-generation auxiliary, the super-polymerized natural rubber is cis-1, 4-polyisoprene rubber with the cis content of 96% or above, the Mooney viscosity is 80-90 MU, the nitrogen content is smaller than or equal to 0.4%, the tensile strength is larger than or equal to 26.5 MPa, the elongation at break is larger than or equal to 760%, and the low-heat-generation auxiliary is a low-heat-generation auxiliary. According to the invention, the imported smoked sheet rubber is directly replaced by the super-polymerized natural rubber, the key physical indexes of the rubber material are at the same level, but the heat generation is slightly high; by applying the low-heat-generation auxiliary agent, the heat generation of the rubber material is obviously reduced, and the tensile strength, the elongation at break and the wear resistance of the rubber material are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tire processing, in particular to an aviation radial tire tread rubber material and a tire. Background Art

[0002] As the aircraft's primary control system on the ground, aircraft tires transmit braking force to the runway and provide lateral force for steering. They bear the entire mass of the aircraft on the ground, cushioning the vibration and impact generated during takeoff, landing, and taxiing, and assisting the aircraft in gliding on the ground. They are subject to heavy loads, high speeds, large sinkage, large deformation, and high inflation pressures. Therefore, aircraft tires must possess excellent impact resistance, puncture resistance, tear resistance, and high-temperature resistance. This requires the rubber compound to have high tensile strength, tensile stress at break, elongation at break, and low heat generation to withstand the strong centrifugal force generated by the aircraft's high-speed takeoff and the huge impact force at the moment of landing.

[0003] RSS1# smoked sheet rubber is the primary material for radial aircraft tires. Due to factors such as geographic environment and processing technology, the performance of domestic natural rubber differs significantly from that of imported RSS1# smoked sheet rubber. Consequently, my country has long relied on imports for high-end aviation rubber. To overcome the limitations of imported RSS1# smoked sheet rubber, research is urgently needed to develop high-performance domestic superpolymerized natural rubber for use in radial aircraft tires.

[0004] Based on this, an aviation radial tire tread rubber material and a tire are now provided, which can eliminate the disadvantages of the existing devices. Summary of the Invention

[0005] The purpose of the present invention is to provide an aviation radial tire tread rubber material and a tire, which solves the problem of inconvenience in use in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A rubber material for the tread of an aviation radial tire comprises, calculated by weight, 1 to 100 phr of superpolymerized natural rubber, 40 to 60 phr of fine-particle wear-resistant carbon black with a high specific surface area, 1 to 5 phr of a multifunctional cross-linking agent, and 0.2 to 2.5 phr of a low-heat-generating additive.

[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In one alternative, the superpolymerized natural rubber is a cis-1,4-polyisoprene rubber with a cis content of at least 96%, a Mooney viscosity of 80-90 MU, a nitrogen content of ≤0.4%, a tensile strength of ≥26.5 MPa, and an elongation at break of ≥760%. The superpolymerized natural rubber is produced using a low-temperature, low-shear, rapid drying process. This eliminates the high energy consumption and structural damage associated with traditional processes such as acid flocculation, shear extrusion dehydration, hammer mill granulation, and high-temperature drying. This process maintains the integrity of the natural rubber's supramolecular network and improves its quality and performance. By preserving the natural rubber's supramolecular structure and maintaining a high molecular weight, its performance is comparable to that of imported No. 1 smoked sheet rubber.

[0010] In an optional solution, the wear-resistant carbon black has an iodine absorption value greater than 110 g / kg and a DBP absorption value greater than 115×10 -5 m 3 / kg, nitrogen adsorption specific surface area greater than 130×10 3 m 2 / kg.

[0011] In one optional scheme: a multifunctional cross-linking agent contains a promoting group at one end, which acts as an accelerator and has good anti-vulcanization reversion performance. It participates in the vulcanization cross-linking reaction. This cross-linking system combines the advantages of single / disulfide bonds in heat resistance, anti-reversion, and small compression deformation, and polysulfide bonds in high strength, high elasticity, tear resistance, and fatigue resistance. It also avoids the poor dynamic performance of single / disulfide bonds and the disadvantages of polysulfide bonds in heat resistance and poor aging resistance.

[0012] In one optional solution: the main component of the low heat generation additive is a multifunctional polyamine compound, whose substituents can react with the molecular chains of natural rubber and filler respectively and form chemical bonds, reducing the slip between the rubber and filler macromolecular chains, thereby reducing the dynamic heat generation performance of the rubber and being beneficial to the physical properties.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention directly uses superpolymerized natural rubber to replace imported smoked sheet rubber. The key physical properties of the rubber are at the same level, but the heat generation is slightly higher. By applying a low-heat generation additive, not only the heat generation of the rubber is significantly reduced, but its tensile strength, elongation at break and wear resistance are further improved. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] The tire tread rubber material of the present invention comprises 1 to 100 phr of domestic high-performance super-polymerized natural rubber, 40 to 60 phr of iodine absorption value greater than 110 g / kg, DBP absorption value greater than 115×10-5 m 3 / kg, nitrogen adsorption specific surface area greater than 130×m 2 / kg of super wear-resistant carbon black, 1 to 5 phr of multifunctional cross-linking agent, 0.2 to 2.5 phr of low heat generation additive, 3 to 6 phr of zinc oxide, 1 to 3 phr of stearic acid, 3 to 6 phr of antioxidant, 2 to 4 phr of protective wax, 0.8 to 2.0 phr of sulfur, and 0.8 to 2.0 phr of accelerator. It is an aviation radial tire tread formula.

[0017] The superpolymerized natural rubber involved in the present invention is produced using a low-temperature, low-shear, rapid drying process, eliminating the problems of high energy consumption and natural rubber structure damage caused by traditional processes such as acid flocculation, shear extrusion dehydration, hammer mill granulation, and high-temperature drying, maintaining the integrity of the natural rubber supramolecular network structure, and improving the quality and performance of natural rubber. Superpolymerized natural rubber is a cis-1,4-polyisoprene rubber with a cis content of more than 96%, a Mooney viscosity of 80 to 90MU, a nitrogen content of ≤0.4%, a tensile strength of ≥26.5MPa, and an elongation at break of ≥760%. Superpolymerized natural rubber maintains the supramolecular structure of natural rubber during the production process and has a higher molecular weight, so its performance is comparable to that of imported 1# smoked sheet rubber;

[0018] The application of multifunctional cross-linking agent can reduce the heat generation of rubber, and at the same time make the vulcanized rubber have good thermal stability and anti-vulcanization reversion, which can significantly improve the thermal stability and wear resistance of tread rubber.

[0019] The main component of the low heat generation additive is a multifunctional polyamine compound, whose substituents can react with the molecular chains of natural rubber and filler respectively and form chemical bonds, reducing the slip between the rubber and filler macromolecular chains, thereby reducing the dynamic heat generation of the rubber and being beneficial to the physical properties.

[0020] Table A: Adjustment plan for the raw rubber system of aviation radial tire tread formula:

[0021]

[0022]

[0023] Table B: Adjustment Plan for Tread Formula and Raw Rubber System of Aviation Radial Tires

[0024]

[0025] Table C: Application of Low Heat Generation Additives in Aviation Radial Tire Tread Formulas

[0026]

[0027] ①: Characterizes the wear resistance of the rubber compound. The lower the value, the better the wear resistance.

[0028] ②: Characterizes the cut resistance of the rubber compound. The higher the value, the better the cut resistance.

[0029] ③: Indicates tear resistance. The higher the value, the better the tear resistance.

[0030] ④ The value that characterizes the heat generation of the rubber compound. The lower the value, the lower the heat generation of the rubber compound.

[0031] The above Tables A, B, and C are verified in two aspects respectively. Tables A and B are test plans for verifying the adjustment of the raw rubber system in the formula, and Table B is an adjustment test plan for increasing the proportion of domestic high-performance super-polymerized natural rubber until the raw rubber system is entirely made of super-polymerized natural rubber. When super-polymerized natural rubber is used to partially replace or replace imported RSS1# in equal amounts, the reinforcement, filling system, and vulcanization system of the formula do not need to be adjusted. The optimal solution in Table A + Table B + Table C constitutes the aviation radial tire tread formula that we want to protect. The raw materials used in the present invention are all domestically produced, and the weighing and rubber mixing are all carried out on domestic equipment, truly realizing the localization of the high-performance aviation radial tire tread formula.

[0032] These results show that:

[0033] Directly using superpolymerized natural rubber to replace imported 1# smoked sheet rubber, the key physical properties of the rubber material are at the same level, with only slightly higher heat generation;

[0034] By applying low heat generation additives, not only the heat generation of the rubber compound is significantly reduced, but also its tensile strength, elongation at break and wear resistance are further improved;

[0035] The aviation radial tire tread rubber prepared by the present invention has the performance characteristics of high tensile strength, high elongation at break, good tear resistance, good wear resistance, relatively low dynamic heat generation, and good heat resistance stability.

[0036] The mixing process is divided into four steps:

[0037] In the first step, all raw materials except sulfur, accelerator, scorch retarder and multifunctional crosslinking agent are added into the internal mixer according to the capacity of the internal mixer for mixing, and the temperature reaches 165°C for rubber discharge; after stopping for a certain time, the second step of mixing is carried out, and the second step of mixing is to put the rubber discharged from the first step into the internal mixer again for mixing, and the temperature reaches 155°C for rubber discharge; after stopping for a certain time, the third step of mixing is to put the rubber discharged from the second step into the internal mixer again for mixing, and the temperature reaches 145°C for rubber discharge; after stopping for a certain time, the next step of adding the remaining other materials (sulfur, accelerator, scorch retarder and multifunctional crosslinking agent) is carried out, and the fourth step of adding sulfur and rubber and mixing is carried out to complete the preparation of the rubber compound.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An aviation radial tire tread rubber material, characterized by: The composition is calculated by weight and comprises: 1 to 100 phr of superpolymerized natural rubber, 40 to 60 phr of fine-particle wear-resistant carbon black with high specific surface area, 1 to 5 phr of multifunctional crosslinking agent, and 0.2 to 2.5 phr of low heat generation auxiliary agent.

2. The aviation radial tire tread rubber material according to claim 1, characterized in that: The super-polymerized natural rubber is a cis-1,4-polyisoprene rubber with a cis content of more than 96%, a Mooney viscosity of 80 to 90MU, a nitrogen content of ≤0.4%, a tensile strength of ≥26.5MPa, and an elongation at break of ≥760%. The super-polymerized natural rubber is produced using a low-temperature, low-shear, rapid drying technology process.

3. The aviation radial tire tread rubber material according to claim 1, characterized in that: The wear-resistant carbon black has an iodine absorption value greater than 110 g / kg and a DBP absorption value greater than 115×10 -5 m 3 / kg, nitrogen adsorption specific surface area greater than 130×10 3 m 2 / kg.

4. The aviation radial tire tread rubber material according to claim 1, characterized in that: The multifunctional cross-linking agent contains a promoting group at one end and has good anti-reversion performance.

5. The aviation radial tire tread rubber material according to claim 1, characterized in that: The main component of the low heat generation aid is a multifunctional polyamine compound.

6. A tire, characterized in that: The tire is made of the aviation radial tire tread rubber material according to any one of claims 1 to 5.

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