High-performance aviation radial tire tread rubber material as well as preparation method and application thereof

Abstract

The invention provides a high-performance aviation radial tire tread rubber material as well as a preparation method and application thereof, and the tread rubber material comprises the following components based on 100 parts by weight of rubber components: 1-100 phr of a high-performance rubber sheet, 40-60 phr of super 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 agent. By applying the low-heat-generation auxiliary agent, the heat generation of the rubber material is obviously reduced, the tensile strength, the elongation at break and the definite elongation of the rubber material are improved, and the wear resistance and the cutting resistance are further improved; the prepared aviation radial tire tread rubber has the performance characteristics of high tensile strength, high elongation at break, good tear resistance, good wear resistance, good cutting resistance and low dynamic heat generation.

Description

Technical Field

[0001] The present invention relates to the technical field of tire processing, in particular to a high-performance aviation radial tire tread rubber material and a preparation method and application thereof. Background Art

[0002] In the aviation industry, aircraft tires, as core components of an aircraft's ground control system, perform crucial functions. They not only transmit braking force to the runway and provide lateral force for steering, but also bear the entire mass of the aircraft on the ground, cushioning the vibration and impact forces generated during takeoff, landing, and taxiing, and assisting the aircraft in completing ground taxiing operations.

[0003] Because aircraft tires face special operating conditions such as high loads, high speeds, large amounts of sinking, large deformations, and high inflation pressures during actual operation, they must possess excellent properties such as impact resistance, puncture resistance, tear resistance, and high temperature resistance. Specifically, the rubber compound must meet high tensile strength, constant tensile stress, and elongation at break, while maintaining low heat generation characteristics to withstand the strong centrifugal force during high-speed takeoff and the huge impact force at the moment of landing. However, existing technologies and materials still face certain challenges in meeting these stringent requirements, and further improvement and innovation are urgently needed to ensure the reliability and safety of aircraft tires and meet the growing demand for air transportation. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-performance aviation radial tire tread rubber material and a preparation method and application thereof, so as to solve the technical problems existing in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-performance aviation radial tire tread rubber material, calculated based on 100 parts by weight of a rubber component, comprises 1 to 100 phr of a high-performance rubber sheet, 40 to 60 phr of super-wear-resistant carbon black, 1 to 5 phr of a multifunctional crosslinking agent, and 0.2 to 2.5 phr of a low-heat-generating additive.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In one optional solution, the high-performance film is a cis-1,4-polyisoprene rubber with a cis content of over 97%, a Mooney viscosity of 90-95MU, a nitrogen content of ≤0.3%, a tensile strength ≥28.5MPa, an elongation at break ≥800%, and a tear strength ≥28.5Mpa. It is developed by the Rubber Research Institute of the Chinese Academy of Tropical Agricultural Sciences and is made by microbial coagulation of fresh latex, sheeting, air drying, and low-temperature heat pump drying without fumigation. The high-performance film used in the present invention has the performance characteristics of high tensile strength, high elongation at break, high tear strength, good cut resistance, low heat generation, and good aging resistance. The tread formula rubber for aviation radial tires now eliminates imported 1# smoked sheet rubber and adopts high-performance film, breaking the embarrassing situation in which high-end aviation rubber has long relied on imports.

[0009] In one optional scheme: super wear-resistant carbon black, whose iodine absorption value is greater than 110g / kg, DBP absorption value is greater than 115×10-5m3 / kg, and nitrogen adsorption specific surface area is greater than 130×103m2 / kg.

[0010] In one optional option: the high-performance film is a cis-1,4-polyisoprene rubber with a cis content of more than 97%, a Mooney viscosity of 90-95MU, a nitrogen content of ≤0.3%, a tensile strength ≥28.5MPa, an elongation at break ≥800%, and a tear strength ≥28.5Mpa. It is developed by the Rubber Research Institute of the Chinese Academy of Tropical Agricultural Sciences. It is made by microbial coagulation of fresh latex, pressing and drying the sheets, and then low-temperature heat pump drying without fumigation.

[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 slippage between the rubber and filler macromolecular chains, thereby reducing the heat generation of the rubber and being beneficial to the physical properties.

[0013] A method for preparing a high-performance aviation radial tire tread rubber material comprises the following steps:

[0014] In the first step, all raw materials except sulfur, accelerator, scorch retarder and multifunctional cross-linking agent are added to the internal mixer according to the capacity of the internal mixer and mixed until the temperature reaches 165℃ for debinding. After a certain period of time, the second step of mixing is carried out.

[0015] The second step of mixing is to put the rubber material discharged from the first step into the internal mixer again for mixing, mixing until the rubber is discharged at 155℃; after a certain period of time, the third step of mixing is carried out;

[0016] The third step is to put the rubber material discharged from the second step into the internal mixer again for mixing, mixing to 145℃ for rubber discharge; after a certain period of time, the remaining other materials (sulfur, accelerator, scorch retarder and multifunctional cross-linking agent) are added in the next step;

[0017] The fourth step is to add sulfur and rubber and mix them to complete the rubber compound.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects:

[0019] By applying a low-heating additive, the present invention not only significantly reduces the heat generation of the rubber compound, but also improves its tensile strength, elongation at break and fixed elongation, and further improves its wear resistance and cut resistance. The prepared aviation radial tire tread rubber has the performance characteristics of high tensile strength, high elongation at break, good tear resistance, good wear resistance and cut resistance, and low dynamic heat generation. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The tread rubber material of the present invention comprises 1 to 100 phr of high-performance rubber, 40 to 60 phr of super wear-resistant carbon black having an iodine absorption value greater than 110 g / kg, a DBP absorption value greater than 115×10-5 m3 / kg, and a nitrogen adsorption specific surface area greater than 130×103 m2 / kg, 1 to 5 phr of a multifunctional crosslinking agent, 0.2 to 2.5 phr of a low heat generation auxiliary agent, 3 to 6 phr of zinc oxide, 1 to 3 phr of stearic acid, 3 to 6 phr of an antioxidant, 2 to 4 phr of a protective wax, 0.8 to 2.0 phr of sulfur, and 0.8 to 2.0 phr of an accelerator. The invention relates to a tread formula for an aviation radial tire.

[0022] The high-performance rubber film disclosed herein was developed by the Rubber Research Institute of the Chinese Academy of Tropical Agricultural Sciences. It is made by microbial coagulation of fresh latex, sheeting, air drying, and low-temperature heat pump drying, without fumigation. It is a cis-1,4-polyisoprene rubber with a cis content of over 97%, a Mooney viscosity of 90-95 MU, a nitrogen content of ≤0.3%, a tensile strength of ≥28.5 MPa, an elongation at break of ≥800%, and a tear strength of ≥28.5 MPa. The high-performance rubber film employed in this invention exhibits high tensile strength, high elongation at break, high tear strength, good cut resistance, and low heat generation, thereby improving the relevant properties of the tire tread rubber.

[0023] 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.

[0024] The main component of the low heat buildup additive is a multifunctional polyamine compound, whose substituents can react with the molecular chains of natural rubber and filler respectively to form chemical bonds, reducing the slippage between the rubber and filler macromolecular chains, thereby reducing the heat buildup of the rubber compound and improving its physical properties.

[0025] Table A: Adjustment plan for the raw rubber system of aviation radial tire tread formula:

[0026]

[0027]

[0028] Optimization design scheme B for the tread reinforcement filling system and vulcanization system of aviation radial tires;

[0029]

[0030]

[0031] The tread formula uses low heat generation additive solution C;

[0032]

[0033]

[0034] ①: Characterizes the wear resistance of the rubber compound. The lower the value, the better the wear resistance.

[0035] ②: Characterizes the cut resistance of the rubber compound. The higher the value, the better the cut resistance.

[0036] ③: The value that characterizes the heat generation of the rubber compound. The lower the value, the lower the heat generation of the rubber compound.

[0037] Tables A, B, and C above validate three aspects, respectively. Table A is the test plan for verifying the raw rubber system in the formulation, Table B is the adjustment plan for the reinforcing filler system and the vulcanization system, and Table C is the test plan for verifying the low-heat buildup additive. The optimal solution from Tables A, B, and C constitutes the aviation radial tire tread formulation we are protecting. All raw materials used in this invention are domestically produced, and weighing and rubber compound mixing are performed on domestic equipment, truly achieving the domestication of high-performance aviation radial tire tread formulations.

[0038] These results show that:

[0039] When high-performance rubber was directly used in place of imported 1# smoked sheet rubber, the elongation at break decreased by 5% after aging (70°C for 24 hours), exceeding the 3% decrease in elongation at break for the 1# smoked sheet rubber. This indicates that the high-performance rubber's aging resistance is inferior to that of the imported 1# smoked sheet rubber. By optimizing its reinforcement, filling, and vulcanization systems, the high-performance rubber's elongation decreased by 3% after aging, reaching the aging resistance level of the imported 1# smoked sheet rubber.

[0040] 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 modulus are increased, and the wear resistance and cut resistance are further improved.

[0041] 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 and cut resistance, and low dynamic heat generation.

[0042] 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. A high-performance aviation radial tire tread rubber material, characterized in that: The invention comprises, based on 100 parts by weight of the rubber component, 1 to 100 phr of high-performance rubber, 40 to 60 phr of super-wear-resistant carbon black, 1 to 5 phr of multifunctional crosslinking agent, and 0.2 to 2.5 phr of low heat generation auxiliary agent.

2. The high performance aviation radial tire tread rubber material according to claim 1, characterized in that: The high-performance film is a cis-1,4-polyisoprene rubber with a cis content of more than 97%, a Mooney viscosity of 90 to 95MU, a nitrogen content of ≤0.3%, a tensile strength of ≥28.5MPa, an elongation at break of ≥800%, and a tear strength of ≥28.5Mpa.

3. The high performance aviation radial tire tread rubber material according to claim 1, characterized in that: Super wear-resistant carbon black, with an iodine absorption value greater than 110g / kg, a DBP absorption value greater than 115×10-5m3 / kg, and a nitrogen adsorption specific surface area greater than 130×103m2 / kg.

4. The high performance aviation radial tire tread rubber material according to claim 1, characterized in that: The high-performance film is a cis-1,4-polyisoprene rubber with a cis content of more than 97%, a Mooney viscosity of 90 to 95MU, a nitrogen content of ≤0.3%, a tensile strength of ≥28.5MPa, an elongation at break of ≥800%, and a tear strength of ≥28.5Mpa.

5. The high performance aviation radial tire tread rubber material according to claim 1, characterized in that: A multifunctional cross-linking agent, one end of which contains a promoting group, acts as an accelerator and has good anti-vulcanization reversion performance, and participates in the vulcanization cross-linking reaction.

6. The high performance aviation radial tire tread rubber material according to claim 1, characterized in that: The main component of the low heat buildup additive is a multifunctional polyamine compound, the substituents of which can react with the molecular chains of natural rubber and filler respectively to form chemical bonds.

7. A method for preparing a high-performance aviation radial tire tread rubber material, characterized in that: The following steps are involved: In the first step, all raw materials except sulfur, accelerator, scorch retarder and multifunctional cross-linking agent are added to the internal mixer according to the capacity of the internal mixer and mixed until the temperature reaches 165℃ for debinding. After a certain period of time, the second step of mixing is carried out. The second step of mixing is to put the rubber material discharged from the first step into the internal mixer again for mixing, mixing until the rubber is discharged at 155℃; after a certain period of time, the third step of mixing is carried out; The third step is to put the rubber material discharged from the second step into the internal mixer again for mixing, mixing until the temperature reaches 145℃; after a certain period of time, the remaining materials are added in the next step, including sulfur, accelerator, scorch retarder and multifunctional cross-linking agent; The fourth step is to add sulfur and rubber and mix them to complete the preparation of the rubber compound.

8. An application of a high-performance aviation radial tire tread rubber material, characterized in that: The pneumatic tire rubber compound according to any one of claims 1 to 6 is used to prepare tires.

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