Flex-cracking-resistant rubber composition, preparation method and application of final rubber compound of flex-cracking-resistant rubber composition, and tire sidewall rubber
By optimizing the composition and mixing process of the sidewall rubber for aircraft tires, the problem of poor performance of the sidewall rubber under high and low temperature environments has been solved, resulting in sidewall rubber with high mechanical properties and long service life.
Patent Information
- Application Number
- CN202610025769.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-09
- Publication Date
- 2026-02-24
AI Technical Summary
The sidewall rubber of aircraft tires performs poorly in high and low temperature environments, resulting in a decline in mechanical properties and affecting service life.
By using a combination of natural rubber, butadiene rubber, and styrene-butadiene rubber, along with components such as carbon black, silica, and silane coupling agents, and optimizing the formulation and mixing process, a finely dispersed heterogeneous dispersion system is formed, which improves the flexural crack resistance and mechanical properties of the rubber composition.
It significantly improves the tire sidewall rubber's tensile permanent deformation, low compression heat generation, resistance to flexural cracking, and aging resistance, thus extending the service life of aircraft tires.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of polymer materials technology, specifically relating to a flexural crack-resistant rubber composition and its final compound preparation method and application, and a tire sidewall rubber. Background Technology
[0002] The sidewall is the part of an aircraft tire that experiences the greatest lateral deformation during operation, enduring frequent and high-intensity flexural deformation. Simultaneously, because aircraft often face service conditions with varying high and low temperatures, higher performance requirements are placed on the sidewall rubber of aircraft tires. Under high-temperature conditions, rubber is prone to thermo-oxidative aging, leading to the breakage of the rubber molecular chains and a decline in mechanical properties; while under low-temperature conditions, the sidewall rubber must maintain good flexibility, otherwise it is prone to becoming brittle and cracking, affecting flight safety.
[0003] Currently, the low tensile permanent deformation performance, high temperature aging resistance, and low brittle temperature performance of aircraft tire sidewall rubber are still poor, which seriously affects the service life of aircraft tires. Summary of the Invention
[0004] The purpose of this invention is to provide a flexural crack-resistant rubber composition and its final compound preparation method and application, as well as a tire sidewall rubber. The flexural crack-resistant rubber composition provided by this invention is applied to the sidewall rubber of aircraft tires and has the characteristics of low permanent deformation at break, low heat generation during compression, excellent resistance to flexural cracking and aging, thereby significantly improving the service life of aircraft tires.
[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a flexural crack-resistant rubber composition comprising the following raw materials in parts by weight: Natural rubber 60-90 parts, butadiene rubber 10-30 parts, styrene-butadiene rubber 5-10 parts, carbon black 40-60 parts, silica 5-13 parts, silane coupling agent 1-5 parts, aromatic oil 2-10 parts, heat stabilizer 1-3 parts, protective wax 1-3 parts, homogenizer 1-3 parts, zinc oxide 3-8 parts, stearic acid 2-6 parts, p-phenylenediamine antioxidant 1-5 parts, accelerator 1-2 parts, insoluble sulfur 2-3 parts, scorching inhibitor 0-1 part.
[0006] Preferably, the butadiene rubber is NdBR9104 and / or BR9000; the styrene-butadiene rubber is SSBR2605 and / or SBR1500E.
[0007] Preferably, the carbon black comprises one or more of N220, N330, N339, and N375; and the silane coupling agent is KH-845-4.
[0008] Preferably, the heat stabilizer is heat stabilizer HS-80; the protective wax is protective wax RP-3 and / or protective wax Okerin 1900.
[0009] Preferably, the homogenizer is homogenizer 145A; the p-phenylenediamine antioxidant includes antioxidant 4010NA and / or antioxidant 4020.
[0010] Preferably, the accelerator includes one or more of accelerators TMTD, NOBS, DM, DZ, and CZ; the scorching inhibitor is CTP.
[0011] This invention provides a method for preparing the final compound of the flexural crack-resistant rubber composition described in the above technical solution, comprising the following steps: Natural rubber, butadiene rubber, styrene-butadiene rubber, zinc oxide, stearic acid, homogenizer, heat stabilizer, protective wax and p-phenylenediamine antioxidant are mixed in one stage to obtain a one-stage compound; The first-stage compound, carbon black, aromatic oil, silica, and silane coupling agent are mixed in a second stage to obtain a second-stage compound. The two-stage compound, accelerator, insoluble sulfur, and scorch inhibitor are then subjected to final compounding to obtain the final compound of the flexural crack-resistant rubber composition.
[0012] Preferably, the temperature of the first stage of mixing is 110~120℃; the temperature after the second stage of mixing is 120~130℃; and the temperature of the final mixing is 90~100℃.
[0013] The present invention provides the application of the final compound of the flexural crack-resistant rubber composition described in the above technical solution or the flexural crack-resistant rubber composition prepared by the preparation method described in the above technical solution in tire sidewall rubber.
[0014] This invention provides a tire sidewall rubber, which is prepared by vulcanization of the final compound of the flexural crack-resistant rubber composition described in the above technical solution.
[0015] This invention provides a flexural crack-resistant rubber composition comprising the following raw materials in parts by weight: 60-90 parts natural rubber, 10-30 parts butadiene rubber, 5-10 parts styrene-butadiene rubber, 40-60 parts carbon black, 5-13 parts silica, 1-5 parts silane coupling agent, 2-10 parts aromatic oil, 1-3 parts heat stabilizer, 1-3 parts protective wax, 1-3 parts homogenizer, 3-8 parts zinc oxide, 2-6 parts stearic acid, 1-5 parts p-phenylenediamine antioxidant, 1-2 parts accelerator, 2-3 parts insoluble sulfur, and 0-1 part scorching inhibitor. This invention utilizes natural rubber, butadiene rubber, and styrene-butadiene rubber as a raw rubber system. By optimizing the mass ratio of the three components in the raw rubber system, a finely dispersed heterogeneous dispersion system can be formed. Natural rubber is characterized by low heat generation, low brittle temperature, and excellent mechanical properties, while butadiene rubber and styrene-butadiene rubber have advantages in aging resistance, heat resistance, and good processing performance. This invention, by blending the three components, can significantly improve the flexural crack resistance of the rubber composition. This invention uses carbon black as a reinforcing system, which can improve the processing performance of the rubber compound, reduce heat generation, and significantly improve the tensile strength and 300% tensile stress, among other mechanical properties. The use of aromatic oil helps increase the plasticity of the rubber compound, thereby promoting uniform blending of carbon black and the rubber compound. This invention utilizes silica and carbon black together to form a reinforcing system, which can effectively reduce heat generation while maintaining good mechanical properties of the rubber compound. This invention uses a silane coupling agent to improve the compatibility between silica and the rubber matrix, enhance interfacial bonding, and improve the tensile strength and tear resistance of the rubber compound as a sidewall compound. This invention uses heat stabilizers to improve the performance stability of rubber compounds at high temperatures, preventing vulcanization reversion and performance degradation. It uses protective waxes to improve the weather resistance of the rubber compounds, thus preventing aging cracks during tire storage and use. It uses homogenizers to promote the uniform distribution of fillers and additives in the rubber matrix, preventing agglomeration, reducing mixing energy consumption, lowering viscosity, and improving processing performance. It uses p-phenylenediamine antioxidants to inhibit degradation caused by external factors such as heat, oxygen, and mechanical stress, delaying aging. It uses accelerators to accelerate the rubber vulcanization process, lower the vulcanization temperature of the sidewall rubber, shorten vulcanization time, reduce production costs, and improve work efficiency. It uses anti-scorching agents to further extend the scorching time of the rubber, improving the yield of high-quality tires. In summary, the flexural crack-resistant rubber composition provided by this invention, through optimized formulation and mass ratio, has the characteristics of low permanent deformation at break, low heat generation during compression, excellent resistance to flexural cracking and aging, when used as a tire sidewall compound in aircraft tires. This composition can significantly improve the service life of aircraft tires. Detailed Implementation
[0016] This invention provides a flexural crack-resistant rubber composition comprising the following raw materials in parts by weight: Natural rubber 60-90 parts, butadiene rubber 10-30 parts, styrene-butadiene rubber 5-10 parts, carbon black 40-60 parts, silica 5-13 parts, silane coupling agent 1-5 parts, aromatic oil 2-10 parts, heat stabilizer 1-3 parts, protective wax 1-3 parts, homogenizer 1-3 parts, zinc oxide 3-8 parts, stearic acid 2-6 parts, p-phenylenediamine antioxidant 1-5 parts, accelerator 1-2 parts, insoluble sulfur 2-3 parts, scorching inhibitor 0-1 part.
[0017] In this invention, unless otherwise specified, all raw materials / components used in the preparation are commercially available products well known to those skilled in the art.
[0018] The raw materials for preparing the flexural crack-resistant rubber composition provided by this invention, by weight, include 60-90 parts of natural rubber, and in the examples, these parts may be 60, 65, 70, 75, 80, 85, or 90 parts. In this invention, the natural rubber can be domestically produced natural rubber. The natural rubber is provided by Yunnan Natural Rubber Industry Group Jiangcheng Co., Ltd., and its product name is SCR WF (Full Latex Natural Rubber).
[0019] This invention uses domestically produced natural rubber, resulting in a rubber composition with lower heat generation, lower brittle temperature, and superior mechanical properties.
[0020] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 10-30 parts of butadiene rubber, and in the examples, it can be 10, 15, 20, 25, or 30 parts. In the present invention, the butadiene rubber is preferably NdBR9104 and / or BR9000. In the embodiments of the present invention, the butadiene rubber is more preferably a high-cis butadiene rubber NdBR9104.
[0021] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by this invention include 5-10 parts of styrene-butadiene rubber (SBR), and in the examples, these can be 5, 6, 7, 8, 9, or 10 parts. In this invention, the SBR is preferably SSBR2605 and / or SBR1500E. The SSBR2605 is solution-polymerized SBR2605. The solution-polymerized SBR2605 was purchased from Sinopec Baling Petrochemical Company. The SBR1500E is emulsion-polymerized SBR1500E, specifically Jilin Petrochemical thermoplastic SBR1500E.
[0022] This invention preferably uses high-cis butadiene rubber NdBR9104, which has more cis structures compared to butadiene rubber BR9000. Solution-polymerized styrene-butadiene rubber SSBR2605 has the advantages of lower molecular chain branching and narrower molecular weight distribution compared to emulsion-polymerized styrene-butadiene rubber SBR1500E. Therefore, this invention uses a raw rubber system composed of all-latex natural rubber SCR WF, NdBR9104, and SSBR2605 to form a rubber composition, which helps improve the processing performance, flexural strength, tensile strength, high-temperature aging resistance, and brittle temperature of the flexural crack-resistant rubber composition as a tire sidewall compound.
[0023] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 40-60 parts of carbon black, which can be 40, 45, 50, 55, or 60 parts in the embodiments. In the present invention, the carbon black includes one or more of N220, N330, N339, and N375, preferably N220 and / or N375, which can be N220 and N375 in the embodiments. In the present invention, the mass fraction of N220 is preferably 20-30 parts, which can be 25 parts in the embodiments. The mass fraction of N375 is preferably 10-30 parts, which can be 15, 20, or 25 parts in the embodiments.
[0024] In this invention, N220 and N375 have superior wear resistance. By using N220 and N375 as reinforcing agents in the rubber composition, this invention can more effectively improve the processing performance of the rubber compound, reduce heat generation, and further improve the tensile strength and mechanical properties such as 300% constant elongation stress of the rubber compound.
[0025] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack resistant rubber composition provided by the present invention include 5 to 13 parts of silica, and in the examples, the amounts can be 5, 6, 7, 8, 9, 10, 11, 12 or 13 parts.
[0026] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 1 to 5 parts of silane coupling agent, which may be 1, 2, 3, 4, or 5 parts in the examples. In the present invention, the silane coupling agent is preferably KH-845-4 (Si-69).
[0027] This invention uses silica as a reinforcing component, which can effectively reduce heat generation while maintaining good mechanical properties of the rubber compound. Simultaneously, the use of the silane coupling agent Si-69 improves the compatibility between silica and the rubber matrix, enhances interfacial bonding, and further improves the tensile strength and tear resistance of the flexural crack-resistant rubber composition as a tire sidewall compound.
[0028] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by this invention include 2 to 10 parts of aromatic oil, and in the examples, these can be 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts. The use of aromatic oil in this invention helps to increase the plasticity of the rubber compound, thereby promoting uniform blending of carbon black and the rubber compound.
[0029] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 1 to 3 parts of heat stabilizer, which may be 1, 2, or 3 parts in the examples. In the present invention, the heat stabilizer is preferably heat stabilizer HS-80.
[0030] In this invention, heat stabilizer HS-80 is used to improve the performance stability of the rubber compound at high temperatures, and can effectively prevent the rubber compound from undergoing vulcanization reversion at high temperatures, which would lead to a decrease in performance.
[0031] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 1 to 3 parts of protective wax, which may be 1, 2, or 3 parts in the examples. In the present invention, the protective wax is protective wax RP-3 and / or protective wax Okerin 1900.
[0032] The present invention preferably uses protective wax RP-3, which further improves the weather aging resistance of the rubber compound, thereby effectively preventing aging cracks from occurring during tire storage and use.
[0033] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by this invention include 1 to 3 parts of a homogenizer, which may be 1, 2, or 3 parts in the examples. In this invention, the homogenizer is preferably homogenizer 145A. The homogenizer 145A is Rhenosin 145A, a rubber processing aid manufactured by Lanxess, Germany. The use of homogenizer 145A in this invention helps to further promote the uniform distribution of fillers and additives in the rubber matrix, effectively avoids agglomeration, further reduces mixing energy consumption, lowers viscosity, and improves processing performance.
[0034] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack resistant rubber composition provided by the present invention include 3 to 8 parts of zinc oxide, and in the examples, it can be 3, 4, 5, 6, 7 or 8 parts.
[0035] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack resistant rubber composition provided by the present invention include 2 to 6 parts of stearic acid, which can be 2, 3, 4, 5 or 6 parts in the examples.
[0036] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 1 to 5 parts of a p-phenylenediamine antioxidant, which can be 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, or 5 parts in the examples. In the present invention, the p-phenylenediamine antioxidant preferably includes antioxidant 4010NA and / or antioxidant 4020, which can be antioxidant 4010NA and antioxidant 4020 in the examples. In the present invention, the mass fraction of antioxidant 4010NA is preferably 0.5 to 3 parts, which can be 1, 2, 2.5, or 3 parts in the examples. The mass fraction of antioxidant 4020 is preferably 0.5 to 2 parts, which can be 1, 1.5, 2, or 2.5 parts in the examples.
[0037] This invention combines antioxidants 4010NA and 4020, which is more effective in inhibiting the degradation of rubber compounds caused by external factors such as heat, oxygen and mechanical stress, and can further delay the aging of rubber compounds.
[0038] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 1-2 parts of an accelerator, which in the examples can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2 parts. In the present invention, the accelerator preferably includes one or more of accelerators TMTD, NOBS, DM, DZ, and CZ, which in the examples can be TMTD and NOBS. In the present invention, the mass fraction of accelerator TMTD is preferably 0.1-0.5 parts, which in the examples can be 0.2, 0.3, 0.4, or 0.5 parts. The mass fraction of accelerator NOBS is preferably 0.9-1.5 parts, which in the examples can be 1, 1.1, 1.2, 1.3, or 1.4 parts.
[0039] The present invention preferably uses accelerators TMTD and NOBS together, which helps to accelerate the rubber vulcanization process, reduce the vulcanization temperature of the flexural crack resistant rubber composition as the sidewall rubber, shorten the vulcanization time to reduce production costs and improve work efficiency.
[0040] Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 2-3 parts of insoluble sulfur, which can be 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3 parts in the examples. Based on the mass fraction of the natural rubber, the raw materials for preparing the flexural crack-resistant rubber composition provided by the present invention include 0-1 parts of an anti-scorching agent. This can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1 part in the examples. In the present invention, the anti-scorching agent is preferably CTP.
[0041] The present invention adds an anti-scorching agent to the rubber composition, and further uses the anti-scorching agent CTP, which can better extend the scorching time of the rubber and improve the yield of finished tire products.
[0042] This invention provides a method for preparing the final compound of the flexural crack-resistant rubber composition described in the above technical solution, comprising the following steps: Natural rubber, butadiene rubber, styrene-butadiene rubber, zinc oxide, stearic acid, homogenizer, heat stabilizer, protective wax and p-phenylenediamine antioxidant are mixed in one stage to obtain a one-stage compound; The first-stage compound, carbon black, aromatic oil, silica, and silane coupling agent are mixed in a second stage to obtain a second-stage compound. The two-stage compound, accelerator, insoluble sulfur, and scorch inhibitor are then subjected to final compounding to obtain the final compound of the flexural crack-resistant rubber composition.
[0043] This invention involves a single-stage mixing of natural rubber, butadiene rubber, styrene-butadiene rubber, zinc oxide, stearic acid, a homogenizing agent, a heat stabilizer, a protective wax, and a p-phenylenediamine antioxidant to obtain a single-stage compound. In this invention, the single-stage mixing is performed in an internal mixer. The preferred temperature for the single-stage mixing is 110-120°C. The temperature gradually increases during the single-stage mixing process, and the temperature at the end of the single-stage mixing is the same as the temperature at which the single-stage mixing is completed. After the single-stage mixing is completed, this invention preferably further includes sequentially discharging, sheeting, and cooling to obtain the single-stage compound. In this invention, discharging refers to removing the rubber compound obtained after the single-stage mixing from the internal mixer. Sheeting is performed in an open mill. This invention does not have specific requirements regarding the cooling time.
[0044] After obtaining the first-stage compound, the present invention further performs a second-stage compounding with the first-stage compound, carbon black, aromatic oil, silica, and silane coupling agent to obtain a second-stage compound. In this invention, the second-stage compounding is carried out in an internal mixer. The preferred temperature for the second-stage compounding is 120-130°C. The temperature gradually increases during the second-stage compounding process, and the temperature at the end of the second-stage compounding is the same as the temperature at which the second-stage compounding ends. After the second-stage compounding is completed, the present invention preferably further includes sequentially discharging, sheeting, and cooling to obtain the second-stage compound. In this invention, discharging refers to removing the rubber compound obtained after the second-stage compounding from the internal mixer. Sheeting is carried out in an open mill. The present invention does not have special requirements regarding the cooling time.
[0045] After obtaining the two-stage compound, the present invention performs a final mixing of the two-stage compound, accelerator, insoluble sulfur, and scorch inhibitor to obtain the final compound of the flexural crack-resistant rubber composition. In this invention, the final mixing is carried out in an internal mixer. The preferred temperature for the final mixing is 90-100°C. The temperature gradually increases during the final mixing process, and the final mixing temperature is the temperature at the end of the final mixing. After the final mixing, the present invention preferably further includes sequentially discharging, sheeting, and cooling to obtain the final compound of the flexural crack-resistant rubber composition. In this invention, discharging refers to removing the rubber compound obtained after the final mixing from the internal mixer. Sheeting is carried out in an open mill. The present invention does not have special requirements regarding the cooling time.
[0046] The present invention provides the application of the final compound of the flexural crack-resistant rubber composition described in the above technical solution or the flexural crack-resistant rubber composition prepared by the preparation method described in the above technical solution in tire sidewall rubber.
[0047] This invention provides a tire sidewall rubber, which is prepared by vulcanization of the final compound of the flexural crack-resistant rubber composition described in the above technical solution.
[0048] In this invention, the tire sidewall rubber can be aviation tire sidewall rubber.
[0049] In this invention, the vulcanization conditions preferably include: a temperature of 135-140°C and a time of 40-45 minutes.
[0050] The flexural crack-resistant rubber composition provided by this invention, when used as a sidewall rubber for aircraft tires, exhibits high-temperature aging resistance, low brittle temperature, excellent flexural resistance, low tensile permanent deformation, and superior mechanical properties.
[0051] To further illustrate the present invention, the technical solutions provided by the present invention are described in detail below with reference to embodiments, but these should not be construed as limiting the scope of protection of the present invention. The domestically produced natural rubber used in the following embodiments is SCR WF full-latex natural rubber.
[0052] Example 1 This embodiment provides a flexural crack-resistant rubber composition for aircraft tire sidewall rubber, specifically comprising the following raw materials in parts by weight: The composition includes: 70 parts domestic natural rubber, 20 parts BR9000, 10 parts SSBR2605, 25 parts N220, 20 parts N375, 5 parts silica, 2 parts silane coupling agent Si-69, 4 parts aromatic oil, 1 part heat stabilizer HS-80, 1 part protective wax RP-3, 1 part homogenizer 145A, 7 parts zinc oxide, 4 parts stearic acid, 2 parts antioxidant 4010NA, 1.5 parts antioxidant 4020, 0.4 parts accelerator TMTD, 1.2 parts accelerator NOBS, 3 parts insoluble sulfur, and 0.5 parts scorching inhibitor CTP.
[0053] The final compound of the flexural crack-resistant rubber composition provided in this embodiment is prepared using a two-roll internal mixer, specifically including the following steps: Step 1: Add natural rubber, butadiene rubber, styrene-butadiene rubber, zinc oxide, stearic acid, homogenizer, heat stabilizer, protective wax and antioxidant into an internal mixer in proportion, mix and mix at a mixing temperature of 110~120℃. After the mixing is completed, discharge it into an open mill for sheeting, cool and let it stand to obtain a section of compound rubber. Step 2: Mix the first-stage compound rubber, carbon black, aromatic oil, silica and coupling agent in an intensive mixing process at a temperature of 120~130℃. After the intensive mixing is completed, discharge the mixture into a two-roll mill for sheeting, cool and let it stand to obtain the second-stage compound rubber. Step 3: Add the two-stage compound rubber, accelerator, sulfur and anti-scorching agent into the mixture according to the proportion and mix them in an internal mixing chamber at a temperature of 90~100℃. After the mixing is completed, sheet the mixture in a two-roll mill, cool it and let it stand to obtain the final compound rubber.
[0054] Example 2 This embodiment provides a flexural crack-resistant rubber composition for aircraft tire sidewall rubber, specifically comprising the following raw materials in parts by weight: The composition includes: 70 parts domestic natural rubber, 20 parts NdBR9104, 10 parts SBR1500E, 25 parts N220, 20 parts N375, 5 parts silica, 2 parts silane coupling agent Si-69, 4 parts aromatic oil, 1 part heat stabilizer HS-80, 1 part protective wax RP-3, 1 part homogenizer 145A, 7 parts zinc oxide, 4 parts stearic acid, 2 parts antioxidant 4010NA, 1.5 parts antioxidant 4020, 0.4 parts accelerator TMTD, 1.2 parts accelerator NOBS, 3 parts insoluble sulfur, and 0.5 parts scorching inhibitor CTP.
[0055] The method for preparing the final compound of the flexural crack resistant rubber composition provided in this embodiment is the same as that in Example 1, except that the raw materials are replaced with the raw materials described in Example 2.
[0056] Example 3 This embodiment provides a flexural crack-resistant rubber composition for aircraft tire sidewall rubber, specifically comprising the following raw materials in parts by weight: The composition includes: 70 parts domestic natural rubber, 20 parts NdBR9104, 10 parts SSBR2605, 25 parts N220, 20 parts N375, 5 parts silica, 2 parts silane coupling agent Si-69, 4 parts aromatic oil, 1 part heat stabilizer HS-80, 1 part protective wax RP-3, 1 part homogenizer 145A, 7 parts zinc oxide, 4 parts stearic acid, 2 parts antioxidant 4010NA, 1.5 parts antioxidant 4020, 0.4 parts accelerator TMTD, 1.2 parts accelerator NOBS, 3 parts insoluble sulfur, and 0.5 parts scorching inhibitor CTP.
[0057] The method for preparing the final compound of the flexural crack resistant rubber composition provided in this embodiment is the same as that in Example 1, except that the raw materials are replaced with the raw materials described in Example 3.
[0058] Comparative Example 1 This comparative example provides a flexural crack-resistant rubber composition for aircraft tire sidewall rubber, specifically comprising the following raw materials in parts by weight: The composition includes: 80 parts domestic natural rubber, 20 parts BR9000, 25 parts N220, 20 parts N375, 5 parts silica, 2 parts silane coupling agent Si-69, 4 parts aromatic oil, 1 part heat stabilizer HS-80, 1 part protective wax RP-3, 1 part homogenizer 145A, 7 parts zinc oxide, 4 parts stearic acid, 2 parts antioxidant 4010NA, 1.5 parts antioxidant 4020, 0.4 parts accelerator TMTD, 1.2 parts accelerator NOBS, 3 parts insoluble sulfur, and 0.5 parts scorching inhibitor CTP.
[0059] The method for preparing the final compound of the flexural crack resistant rubber composition provided in this comparative example is the same as that in Example 1, except that the raw materials are replaced with the raw materials described above in Comparative Example 1.
[0060] Comparative Example 2 This comparative example provides a rubber composition for use in the sidewall rubber of aircraft tires, specifically comprising the following raw materials in parts by weight: The composition includes: 70 parts domestic natural rubber, 20 parts NdBR9104, 10 parts SSBR2605, 25 parts N220, 20 parts N375, 5 parts silica, 2 parts silane coupling agent Si-69, 4 parts aromatic oil, 1 part heat stabilizer HS-80, 1 part protective wax RP-3, 1 part homogenizer 145A, 7 parts zinc oxide, 4 parts stearic acid, 2 parts antioxidant 4010NA, 1.5 parts antioxidant 4020, 0.4 parts accelerator TMTD, 1.2 parts accelerator NOBS, 1.5 parts insoluble sulfur, and 0.25 parts scorching inhibitor CTP.
[0061] The method for preparing the final compound of the rubber composition provided in this comparative example is the same as that in Example 1, except that the raw materials are replaced with the raw materials described above in Comparative Example 2.
[0062] Comparative Example 3 This comparative example provides a rubber composition for use in the sidewall rubber of aircraft tires, specifically comprising the following raw materials in parts by weight: The composition includes: 70 parts domestic natural rubber, 20 parts NdBR9104, 10 parts SSBR2605, 25 parts N220, 20 parts N375, 15 parts silica, 2 parts silane coupling agent Si-69, 4 parts aromatic oil, 1 part heat stabilizer HS-80, 1 part protective wax RP-3, 1 part homogenizer 145A, 7 parts zinc oxide, 4 parts stearic acid, 2 parts antioxidant 4010NA, 1.5 parts antioxidant 4020, 0.4 parts accelerator TMTD, 1.2 parts accelerator NOBS, 3 parts insoluble sulfur, and 0.5 parts scorching inhibitor CTP.
[0063] The preparation method of the final compound of the rubber composition provided in this comparative example is the same as that in Example 1, except that the raw materials are replaced with the raw materials described in Comparative Example 3.
[0064] The final compound of the flexural crack resistant rubber composition prepared in Examples 1-3 and Comparative Examples 1-3 was vulcanized (140℃×40min) to obtain vulcanized rubber. The relevant performance tests were conducted, and the test results are shown in Table 1.
[0065] Table 1 Performance test results of Examples 1-3 and Comparative Examples 1-3
[0066] As can be seen from the data in Table 1, the flexural crack resistant rubber composition for aircraft tire sidewall rubber provided in this embodiment of the invention has excellent flexural crack resistant performance, low tensile permanent deformation, low heat generation performance and good mechanical properties compared with the aircraft tire sidewall rubber used in the current technology.
[0067] As can be seen from the above embodiments, the flexural crack-resistant rubber composition for aircraft tire sidewall rubber provided by the present invention improves the overall performance of aircraft tire sidewall rubber by introducing cis-butadiene rubber and styrene-butadiene rubber into natural rubber. At the same time, other key components are combined in the formulation to optimize the mass ratio of each component in the formulation. The flexural crack-resistant rubber composition provided as a sidewall rubber has excellent properties such as low tensile permanent deformation, high temperature aging resistance, low brittle temperature, low heat generation, and excellent tensile properties.
[0068] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.
Claims
1. A flexural crack-resistant rubber composition, characterized in that, The preparation raw materials include the following parts by weight: Natural rubber 60-90 parts, butadiene rubber 10-30 parts, styrene-butadiene rubber 5-10 parts, carbon black 40-60 parts, silica 5-13 parts, silane coupling agent 1-5 parts, aromatic oil 2-10 parts, heat stabilizer 1-3 parts, protective wax 1-3 parts, homogenizer 1-3 parts, zinc oxide 3-8 parts, stearic acid 2-6 parts, p-phenylenediamine antioxidant 1-5 parts, accelerator 1-2 parts, insoluble sulfur 2-3 parts, scorching inhibitor 0-1 part.
2. The flexural crack-resistant rubber composition according to claim 1, characterized in that, The butadiene rubber is NdBR9104 and / or BR9000; the styrene-butadiene rubber is SSBR2605 and / or SBR1500E.
3. The flexural crack-resistant rubber composition according to claim 1, characterized in that, The carbon black includes one or more of N220, N330, N339 and N375; the silane coupling agent is KH-845-4.
4. The flexural crack-resistant rubber composition according to claim 1, characterized in that, The heat stabilizer is heat stabilizer HS-80; the protective wax is protective wax RP-3 and / or protective wax Okerin 1900.
5. The flexural crack-resistant rubber composition according to claim 1, characterized in that, The homogenizer is homogenizer 145A; the p-phenylenediamine antioxidant includes antioxidant 4010NA and / or antioxidant 4020.
6. The flexural crack-resistant rubber composition according to claim 1, characterized in that, The accelerator includes one or more of accelerators TMTD, NOBS, DM, DZ, and CZ; the scorching inhibitor is CTP.
7. A method for preparing the final compound of the flexural crack-resistant rubber composition according to any one of claims 1 to 6, characterized in that, Includes the following steps: Natural rubber, butadiene rubber, styrene-butadiene rubber, zinc oxide, stearic acid, homogenizer, heat stabilizer, protective wax and p-phenylenediamine antioxidant are mixed in one stage to obtain a one-stage compound; The first-stage compound, carbon black, aromatic oil, silica, and silane coupling agent are mixed in a second stage to obtain a second-stage compound. The two-stage compound, accelerator, insoluble sulfur, and scorch inhibitor are then subjected to final compounding to obtain the final compound of the flexural crack-resistant rubber composition.
8. The preparation method according to claim 7, characterized in that, The temperature of the first stage of mixing is 110~120℃; the temperature after the second stage of mixing is 120~130℃; and the temperature of the final mixing is 90~100℃.
9. The application of the final compound of the flexural crack-resistant rubber composition according to any one of claims 1 to 6 or the flexural crack-resistant rubber composition prepared by the preparation method according to claim 7 or 8 in tire sidewall rubber.
10. A tire sidewall rubber, characterized in that, It is prepared by vulcanization of the final compound of the flexural crack-resistant rubber composition according to any one of claims 1 to 6.