Synthetic rubber reinforced tread rubber, preparation method thereof and application of synthetic rubber reinforced tread rubber in aircraft tires

Abstract

The invention relates to the technical field of aircraft tires, and provides synthetic rubber reinforced tread rubber as well as a preparation method and application thereof in aircraft tires. The tread rubber provided by the invention is prepared from the following components in parts by mass: 70 to 89 parts of natural rubber, 1 to 15 parts of synthetic rubber, 10 to 30 parts of white carbon black wet rubber, 1 to 5 parts of silane coupling agent, 1 to 5 parts of stearic acid, 2 to 6 parts of zinc oxide, 1 to 10 parts of processing aid, 1.5 to 8 parts of anti-aging agent, 20 to 50 parts of carbon black, 2 to 6 parts of softening plasticizer, 1 to 4 parts of insoluble sulfur, 0.5 to 2.5 parts of accelerant, 1 to 3 parts of anti-reversion agent and 0 to 0.8 part of scorch retarder. The synthetic rubber reinforced tread rubber provided by the invention has excellent mechanical properties, especially greatly improved high temperature aging resistance and tear resistance, can meet the use requirements of aircraft tires, and has wide application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aviation tire, in particular to a synthetic rubber reinforced tread rubber, a preparation method thereof and application thereof in aviation tire. BACKGROUND

[0002] In the field of aviation tire manufacturing, the tread rubber is a key part directly contacting the ground, and its use condition is very harsh. When the tire touches the ground under load and accelerates to a high speed, the tread needs to withstand the impact force generated during the landing of the aircraft, and the tread rubber needs to have good wear resistance, impact resistance, tear resistance, fatigue resistance and aging resistance, and low heat generation and rolling resistance.

[0003] At present, the preparation of aviation tire tread rubber is mostly based on pure natural rubber as the base material. Natural rubber has excellent elasticity, tensile strength and low temperature performance, which meets the basic use requirements of aviation tire to a certain extent. However, with the rapid development of the aviation industry, the take-off weight, take-off speed and flight frequency of the aircraft are continuously improved, and the performance requirements of the aviation tire tread rubber are increasingly stringent. The physical properties of the tread rubber prepared by relying solely on pure natural rubber are difficult to meet the requirements, especially the high-temperature aging resistance and tear resistance need to be improved. SUMMARY

[0004] Therefore, the present application provides a synthetic rubber reinforced tread rubber, a preparation method thereof and application thereof in aviation tire. A small amount of synthetic rubber is introduced together with natural rubber, which effectively improves the physical properties of the tread rubber, especially the high-temperature aging resistance and tear resistance are greatly improved, which can meet the use requirements of aviation tire.

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions: A synthetic rubber reinforced tread rubber comprises the following components in mass fraction: natural rubber 70-89 parts, synthetic rubber 1-15 parts, white carbon black wet glue 10-30 parts, silane coupling agent 1-5 parts, stearic acid 1-5 parts, zinc oxide 2-6 parts, processing aid 1-10 parts, antioxidant 1.5-8 parts, carbon black 20-50 parts, softening plasticizer 2-6 parts, insoluble sulfur 1-4 parts, accelerator 0.5-2.5 parts, anti-reversion agent 1-3 parts, and anti-scorching agent 0-0.8 parts. The synthetic rubber comprises one or more of ethylene-propylene-diene rubber, cis-butadiene rubber, styrene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber and isoprene rubber.

[0006] Preferably, the natural rubber is homemade natural rubber No. 2.

[0007] Preferably, the total mass fraction of the natural rubber and the synthetic rubber is 90 parts.

[0008] Preferably, the carbon black comprises one or more of N234, N330, N375 and N339; The silane coupling agent comprises one or both of KH-845-4 and KH-560; The processing aid comprises one or more of protective wax, thermal stabilizer, tear resistant resin and processing aid ZNZB746; The antioxidant is an amine antioxidant; The softening plasticizer comprises one or more of aromatic oil and naphthenic oil; The insoluble sulfur comprises one or both of IS-60 and HDOT20; The accelerator comprises one or more of sulfenamide accelerator and thiazole accelerator; The anti-reversion agent is anti-reversion agent WK-901; The scorch retarder is scorch retarder CTP.

[0009] Preferably, the protective wax comprises one or both of protective wax RP-3 and protective wax Okerin 1900; the thermal stabilizer is HS-80, and the tear resistant resin is SL-6903; The sulfenamide accelerator comprises one or more of accelerator DZ, accelerator CZ and accelerator NOBS; the thiazole accelerator comprises one or both of accelerator DM and accelerator M; The amine antioxidant comprises one or more of antioxidant 4010NA, antioxidant 4020, antioxidant RD, antioxidant S-RD, antioxidant H and antioxidant BLE.

[0010] The application also provides a preparation method of the synthetic rubber reinforced tread rubber described in the above scheme, comprising the following steps: The natural rubber, synthetic rubber and white carbon black wet rubber are first mixed and kneaded, then stearic acid, zinc oxide, processing aid and antioxidant are added for second stage mixing and kneading, then carbon black, silane coupling agent and softening plasticizer are added for third stage mixing and kneading, then insoluble sulfur, accelerator, anti-reversion agent and scorch retarder are added for fourth stage mixing and kneading, and then the following steps are sequentially performed: discharging, sheeting, cooling and standing, to obtain the final rubber of the synthetic rubber reinforced tread rubber.

[0011] Preferably, the temperature of the rubber in the first stage mixing and kneading is raised to 50-70℃, the temperature of the rubber in the second stage mixing and kneading is raised from 50-70℃ to 80-90℃, and the temperature of the rubber in the third stage mixing and kneading is raised from 80-90℃ to 100-120℃; the temperature of the rubber in the fourth stage mixing and kneading is kept at 100-120℃; and the standing time is 16-24h.

[0012] Preferably, after obtaining the final rubber compound of the synthetic rubber reinforced tread, the final rubber compound is further vulcanized.

[0013] The application also provides the use of the synthetic rubber reinforced tread according to the above scheme or the synthetic rubber reinforced tread prepared by the preparation method according to the above scheme in an aviation tire.

[0014] The application also provides an aviation tire comprising the synthetic rubber reinforced tread according to the above scheme or the synthetic rubber reinforced tread prepared by the preparation method according to the above scheme.

[0015] The application provides a synthetic rubber reinforced tread, comprising the following components in mass fraction: natural rubber 70-89 parts, synthetic rubber 1-15 parts, white carbon black wet rubber 10-30 parts, silane coupling agent 1-5 parts, stearic acid 1-5 parts, zinc oxide 2-6 parts, processing aid 1-10 parts, antioxidant 1.5-8 parts, carbon black 20-50 parts, softening plasticizer 2-6 parts, insoluble sulfur 1-4 parts, accelerator 0.5-2.5 parts, anti-reversion agent 1-3 parts, and anti-scorching agent 0-0.8 parts. The synthetic rubber comprises one or more of ethylene-propylene-diene rubber, cis-butadiene rubber, styrene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber, and isoprene rubber. A small amount of synthetic rubber is introduced into the natural rubber to form a basic formula of the tread, wherein the natural rubber has the advantages of high elasticity, high resilience, good wear resistance, and easy combination with other rubbers; the ethylene-propylene-diene rubber has outstanding performance in unsaturated bonds on the molecular main chain, high-temperature resistance, ozone resistance, stability, resilience, etc.; the cis-butadiene rubber has a flexible molecular chain, so the resilience performance is very excellent, and it has good low-temperature resistance, wear resistance, small hysteresis loss, low dynamic heat generation, and excellent flex resistance, and can be well applied to the tread of aviation tires; the styrene-butadiene rubber has good strength, elasticity, and tear resistance of vulcanized rubber, and can maintain good physical and mechanical properties in a wide temperature range, especially the solution polymerized styrene-butadiene rubber has a complete molecular structure chain, low rolling resistance, and good combination with other fillers, and has good wet skid resistance and wear resistance; the nitrile rubber has good oil resistance, wear resistance, and heat resistance; the hydrogenated nitrile rubber has excellent high-temperature resistance, corrosion resistance, aging resistance, high strength, tear resistance, and excellent wear resistance, and performs well in dynamic applications; the isoprene rubber is a synthetic rubber prepared by solution directional polymerization of isoprene under the action of a catalyst, and has a similar chemical structure to natural rubber, and is also called synthetic natural rubber. The isoprene rubber has excellent high elasticity, cold resistance, and wear resistance, and also has good processability. In summary, the synthetic rubber and the natural rubber are used together, which can effectively improve the physical properties of the tread, especially the high-temperature aging resistance and tear resistance, and also improves the processability.

[0016] In addition, the reinforcing system adopted by the present application is carbon black, further one or more of N234, N330, N375 and N339 carbon black, wherein the N234 carbon black is high-activity carbon black, having high tensile strength, modulus and hardness; the N300 carbon black is a widely used high-wear-resistant carbon black, which can impart good tensile, tear, wear resistance and resilience to the rubber compound; the N375 and N339 carbon black both belong to high-structure wear-resistant carbon black produced by new technology; the above carbon black can effectively improve the mechanical properties of the tread rubber (including tensile strength, elongation at break, 300% modulus, Shore A hardness).

[0017] In summary, the synthetic rubber reinforced tread rubber provided by the present application has excellent mechanical properties, especially good high-temperature aging resistance and tear resistance, which can better meet the use requirements of aviation tires and has a wide application prospect. DETAILED DESCRIPTION

[0018] The present application provides a kind of synthetic rubber reinforced tread rubber, including the following mass fraction of components: natural rubber 70~89 parts, synthetic rubber 1~15 parts, white carbon black wet method glue 10~30 parts, silane coupling agent 1~5 parts, stearic acid 1~5 parts, zinc oxide 2~6 parts, processing aid 1~10 parts, antioxidant 1.5~8 parts, carbon black 20~50 parts, softening plasticizer 2~6 parts, insoluble sulfur 1~4 parts, accelerator 0.5~2.5 parts, anti-reversion agent 1~3 parts, anti-scorching agent 0~0.8 parts;The synthetic rubber includes one or more of ethylene-propylene-diene rubber, cis-butadiene rubber, styrene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber and isoprene rubber.

[0019] Unless otherwise specified, the materials and equipment used are commercially available in the art.

[0020] In mass fraction, the tread rubber provided by the present application includes natural rubber 70~89 parts, preferably 80~89 parts, which can be 85 parts in the embodiments of the present application;In the present application, the natural rubber is preferably homemade natural rubber No. 2. In the present application, the natural rubber has high elasticity, high resilience, good wear resistance, and is easy to combine with other rubbers.

[0021] In mass fraction of natural rubber, the tread rubber provided by the present application includes synthetic rubber 1~15 parts, preferably 1~10 parts, which can be 5 parts in the embodiments of the present application;The synthetic rubber preferably includes one or more of ethylene-propylene-diene rubber, cis-butadiene rubber, styrene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber and isoprene rubber;The ethylene-propylene-diene rubber is preferably NORDEL EPDM 1640, which is a high-activity ethylene-propylene-diene rubber with high tensile strength, modulus and hardness. TMIP 3760P, the butadiene rubber is preferably BR9000, the styrene butadiene rubber is preferably emulsion polymerized styrene butadiene rubber and / or solution polymerized styrene butadiene rubber, in specific embodiments of the present application, the styrene butadiene rubber is preferably 1502 styrene butadiene rubber; the nitrile rubber is preferably 3355 nitrile rubber, the hydrogenated nitrile rubber is preferably Therban ® 4367; the isoprene rubber is preferably IR 80. The present application can effectively improve various physical properties of the tread rubber by introducing a small amount of synthetic rubber and using domestic natural rubber, especially significantly improving the high temperature aging resistance and tear resistance of the tread rubber.

[0022] The tread rubber provided by the present application includes 10-30 parts, preferably 15-30 parts, and in embodiments of the present application, 20 parts of white carbon black wet rubber, based on the mass fraction of natural rubber.

[0023] The tread rubber provided by the present application includes 1-5 parts, preferably 2-3 parts, of silane coupling agent, based on the mass fraction of natural rubber; the silane coupling agent preferably includes one or both of KH-845-4 and KH-560.

[0024] The tread rubber provided by the present application includes 1-5 parts, preferably 3 or 4 parts, of stearic acid, based on the mass fraction of natural rubber.

[0025] The tread rubber provided by the present application includes 2-6 parts, preferably 2 or 4 parts, of zinc oxide, based on the mass fraction of natural rubber.

[0026] The tread rubber provided by the application includes 1-10 parts, preferably 1-8 parts of processing aids, preferably including one or more of protective wax, heat stabilizer, tear-resistant resin and processing aid ZNZB746; the protective wax preferably includes one or both of protective wax RP-3 and protective wax Okerin 1900; the heat stabilizer is preferably HS-80, and the tear-resistant resin is preferably SL-6903; specifically, when the processing aid includes a heat stabilizer, the amount of the heat stabilizer is preferably 1-2 parts, when the processing aid includes processing aid ZNZB746, the amount of the processing aid ZNZB746 is preferably 2-4 parts, when the processing aid includes protective wax Okerin 1900, the amount of the protective wax Okerin 1900 is preferably 2-4 parts, when the processing aid includes protective wax RP-3, the amount of the protective wax RP-3 is preferably 2-4 parts, and when the processing aid includes tear-resistant resin SL-6903, the amount of the tear-resistant resin SL-6903 is preferably 1-3 parts; in the embodiments of the application, the processing aid is preferably a composite of processing aid ZNZB746, protective wax and tear-resistant resin, and specifically includes 4 parts of processing aid ZNZB746, 1 part of protective wax RP-3 and 2 parts of tear-resistant resin SL-6903.

[0027] The tread rubber provided by the application includes 1.5-8 parts, preferably 1.5-6 parts of anti-aging agents, preferably amine anti-aging agents; the amine anti-aging agents preferably include one or more of anti-aging agent 4010NA, anti-aging agent 4020, anti-aging agent RD, anti-aging agent S-RD, anti-aging agent H and anti-aging agent BLE, preferably at least two, and specifically two or three anti-aging agents; specifically, when the anti-aging agent includes anti-aging agent 4010NA, the amount of the anti-aging agent 4010NA is preferably 1-3 parts, when the anti-aging agent includes anti-aging agent 4020, the amount of the anti-aging agent 4020 is preferably 1-3 parts, when the anti-aging agent includes anti-aging agent RD, the amount of the anti-aging agent RD is preferably 1.5-3.5 parts, when the anti-aging agent includes anti-aging agent S-RD, the amount of the anti-aging agent S-RD is preferably 1.5-3.5 parts, when the anti-aging agent includes anti-aging agent H, the amount of the anti-aging agent H is preferably 0-1 part, and when the anti-aging agent includes anti-aging agent BLE, the amount of the anti-aging agent BLE is preferably 0-1.5 parts; when the anti-aging agent is anti-aging agent H or anti-aging agent BLE, the anti-aging agent H or anti-aging agent BLE is used with other anti-aging agents. In the embodiments of the application, the anti-aging agent is preferably a composite of anti-aging agent 4010NA, anti-aging agent RD and anti-aging agent BLE, and specifically includes 2.5 parts of anti-aging agent 4010NA, 2 parts of anti-aging agent RD and 0.3 parts of anti-aging agent BLE.

[0028] The tread rubber provided by the application includes 20-50 parts, preferably 40-50 parts of carbon black, based on the mass fraction of natural rubber. The carbon black preferably includes one or more of N234, N330, N375 and N339. In specific embodiments of the application, the carbon black is preferably a composite of N234 carbon black and N375 carbon black, and specifically includes 25 parts of N234 carbon black and 20 parts of N375 carbon black. The use of carbon black as a reinforcing system in the application can effectively improve the mechanical properties of the tread rubber.

[0029] The tread rubber provided by the application includes 2-6 parts, preferably 3-5 parts, and specifically 4 parts of a softening plasticizer, based on the mass fraction of natural rubber. The softening plasticizer preferably includes one or more of aromatic oil and naphthenic oil.

[0030] The tread rubber provided by the application includes 1-4 parts, preferably 2-3 parts, and specifically 2.5 parts of insoluble sulfur, based on the mass fraction of natural rubber. The insoluble sulfur preferably includes one or both of IS-60 and HDOT20.

[0031] The tread rubber provided by the application includes 0.5-2.5 parts, preferably 1-2 parts of an accelerator, based on the mass fraction of natural rubber. The accelerator preferably includes one or more of a sulfenamide accelerator and a thiazole accelerator. The sulfenamide accelerator preferably includes one or more of accelerator DZ, accelerator CZ and accelerator NOBS. The thiazole accelerator preferably includes one or both of accelerator DM and accelerator M. In specific embodiments of the application, when the accelerator is accelerator DZ, the amount of accelerator DZ is preferably 1-2 parts, when the accelerator is accelerator CZ, the amount of accelerator CZ is preferably 1-1.5 parts, when the accelerator is accelerator NOBS, the amount of accelerator NOBS is preferably 1.5-2 parts, when the accelerator is accelerator M, the amount of accelerator M is preferably 1.5-2 parts, and when the accelerator is accelerator DM, the amount of accelerator DM is preferably 1.5-2.5 parts.

[0032] The tread rubber provided by the application includes 1-3 parts, preferably 1.5 parts of an anti-reversion agent, based on the mass fraction. The anti-reversion agent is preferably anti-reversion agent WK-901.

[0033] The tread rubber provided by the application includes 0-0.8 parts, preferably 0.5 parts of a scorch retarder, based on the mass fraction. The scorch retarder is preferably scorch retarder CTP.

[0034] The application also provides a preparation method of the synthetic rubber-reinforced tread rubber described in the above scheme, including the following steps: The first stage mixing and mixing of the domestic natural rubber, synthetic rubber and white carbon black wet glue is carried out, then stearic acid, zinc oxide, processing aid and antioxidant are added for the second stage mixing and mixing, then carbon black, silane coupling agent and softening plasticizer are added for the third stage mixing and mixing, then insoluble sulfur, accelerator, anti-reversion agent and anti-scorching agent are added for the fourth stage mixing and mixing, then the glue discharge, sheeting, cooling and parking are sequentially carried out, and the final rubber of the synthetic rubber reinforced tread rubber is obtained.

[0035] In the application, the temperature of the glue in the first stage mixing and mixing is increased to 50-70℃, the temperature of the glue in the second stage mixing and mixing is increased from 50-70℃ to 80-90℃, the temperature of the glue in the third stage mixing and mixing is increased from 80-90℃ to 100-120℃, and the temperature of the glue in the fourth stage mixing and mixing is kept at 100-120℃; the first stage mixing and mixing, the second stage mixing and mixing, the third stage mixing and mixing and the fourth stage mixing and mixing are all carried out in a mixing mill.

[0036] In the application, the sheeting is preferably carried out on an open mill; and the parking time is preferably 16-24h.

[0037] In the application, the final rubber of the synthetic rubber reinforced tread rubber also includes vulcanization of the final rubber, and the application does not have special requirements for the vulcanization conditions, and the vulcanization conditions known to those skilled in the art can be used, specifically, the vulcanization temperature can be 150℃, and the time can be 45min. In the actual application process of the tread rubber, specifically, the final rubber is assembled with other parts of the aircraft tire to obtain a tire blank, and then the tire blank is vulcanized as a whole.

[0038] The application also provides the application of the synthetic rubber reinforced tread rubber in the above scheme or the synthetic rubber reinforced tread rubber prepared by the preparation method in the above scheme in an aircraft tire. The application does not have special requirements for the application method, and the application method known to those skilled in the art can be used.

[0039] The application also provides an aircraft tire comprising the synthetic rubber reinforced tread rubber in the above scheme or the synthetic rubber reinforced tread rubber prepared by the preparation method in the above scheme.

[0040] The technical solutions in the application will be clearly and completely described below with reference to the embodiments in the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0041] Example 1 The preparation raw materials of the synthetic rubber reinforced tread rubber provided in the embodiment are as follows in mass fraction: Domestic natural rubber No. 2 85 parts, 3355 nitrile rubber 5 parts, white carbon black wet rubber 20 parts, silane coupling agent KH-845-4 3 parts, stearic acid 3 parts, zinc oxide 4 parts, processing aid ZNZB746 4 parts, protective wax RP-3 1 part, tear-resistant resin SL-6903 2 parts, antioxidant 4010NA 2.5 parts, antioxidant RD 2 parts, antioxidant BLE 0.3 parts, N234 carbon black 25 parts, N375 carbon black 20 parts, aromatic oil 4 parts, insoluble sulfur IS60 2.5 parts, accelerator DM 2 parts, anti-reversion agent WK90 1.5 parts, and anti-scorching agent CTP 0.5 parts.

[0042] The preparation method of the synthetic rubber reinforced tread rubber provided in the embodiment includes the following steps: Step one, the natural rubber No. 2, 3355 nitrile rubber and white carbon black wet rubber are put into the internal mixer according to the proportion, and the first stage of mixing and mixing is carried out, and the temperature of the rubber material is raised to 70℃ during the first stage of mixing and mixing; Step two, the stearic acid, zinc oxide, processing aid ZNZB746, protective wax RP-3, tear-resistant resin SL-6903, antioxidant 4010NA, antioxidant RD, antioxidant BLE are added into the internal mixer according to the proportion, and the second stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 70℃ to 90℃ during the second stage of mixing and mixing; Step three, the N234 carbon black, N375 carbon black, KH-845-4 silane coupling agent and aromatic oil are continuously added into the internal mixer according to the proportion, and the third stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 90℃ to 110℃ during the third stage of mixing and mixing; Step four, the insoluble sulfur IS60, accelerator DM, anti-reversion agent WK90 and anti-scorching agent CTP are added into the internal mixer according to the proportion, and the fourth stage of mixing and mixing is carried out; the temperature of the rubber material is kept at 100~120℃ during the fourth stage of mixing and mixing; Step five, the mixed rubber obtained in step four is discharged from the internal mixer, and then sheeted on the open mill, cooled and parked after sheeting, and the final rubber of the tread rubber is obtained, and the parking time is 24h.

[0043] Example 2 The preparation raw materials of the synthetic rubber reinforced tread rubber provided in the embodiment are as follows in mass fraction: Domestic natural rubber dawn No. 2 85 parts, 1500E styrene butadiene rubber 5 parts, white carbon black wet rubber 20 parts, silane coupling agent KH-845-4 3 parts, stearic acid 4 parts, zinc oxide 2 parts, processing aid ZNZB746 4 parts, protective wax RP-3 1 part, tear resistant resin SL-6903 2 parts, antioxidant 4010NA 2.5 parts, antioxidant RD 2 parts, antioxidant BLE 0.3 parts, N234 carbon black 25 parts, N375 carbon black 20 parts, aromatic oil 4 parts, insoluble sulfur IS60 2.5 parts, accelerator DM 2 parts, anti-reversion agent WK901 1.5 parts, scorch retarder CTP 0.5 parts.

[0044] The preparation method of the synthetic rubber reinforced tread rubber provided by the embodiment comprises the following steps: Step one, the natural rubber dawn No. 2, 1500E styrene butadiene rubber and white carbon black wet rubber are put into the internal mixer according to the proportion of the parts, and the first stage of mixing and mixing is carried out, and the temperature of the rubber material is raised to 70℃ during the first stage of mixing and mixing; Step two, stearic acid, zinc oxide, processing aid ZNZB746, protective wax RP-3, tear resistant resin SL-6903, antioxidant 4010NA, antioxidant RD, antioxidant BLE are continuously added to the internal mixer according to the proportion of the parts, and the second stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 70℃ to 90℃ during the second stage of mixing and mixing; Step three, N234 carbon black, N375 carbon black, KH-845-4 silane coupling agent and aromatic oil are continuously added to the internal mixer according to the proportion of the parts, and the third stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 90℃ to 110℃ during the third stage of mixing and mixing; Step four, insoluble sulfur IS60, accelerator DM, anti-reversion agent WK901 and scorch retarder CTP are added to the internal mixer according to the proportion of the parts, and the fourth stage of mixing and mixing is carried out; the temperature of the rubber material in the fourth stage of mixing and mixing is kept at 100~120℃; Step five, the mixed rubber obtained in step four is discharged from the internal mixer, and then sheeted on the open mill, cooled and parked after sheeting, and the final rubber of the tread rubber is obtained, and the parking time is 24h.

[0045] Example 3 The preparation raw materials of the synthetic rubber reinforced tread rubber provided by the embodiment are as follows in mass parts: Natural rubber Shuguang No. 2 85 parts, Therban® 4367 hydrogenated butadiene rubber 5 parts, white carbon black wet rubber 20 parts, silane coupling agent KH-845-4 3 parts, stearic acid 4 parts, zinc oxide 2 parts, processing aid ZNZB746 4 parts, protective wax RP-3 1 part, tear resistant resin SL-6903 2 parts, antioxidant 4010NA 2.5 parts, antioxidant RD 2 parts, antioxidant BLE 0.3 parts, N234 carbon black 25 parts, N375 carbon black 20 parts, aromatic oil 4 parts, insoluble sulfur IS60 2.5 parts, accelerator DM 2 parts, anti-reversion agent WK901 1.5 parts, scorch retarder CTP 0.5 parts.

[0046] The preparation method of the synthetic rubber reinforced tread rubber provided by the embodiment comprises the following steps: Step one, the natural rubber Shuguang No. 2, Therban® 4367 hydrogenated butadiene rubber and white carbon black wet rubber are put into the internal mixer according to the proportion of the parts, and the first stage of mixing and mixing is carried out, and the temperature of the rubber material is raised to 70℃ during the first stage of mixing and mixing; Step two, stearic acid, zinc oxide, processing aid ZNZB746, protective wax RP-3, tear resistant resin SL-6903, antioxidant 4010NA, antioxidant RD, antioxidant BLE are continuously added to the internal mixer according to the proportion of the parts, and the second stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 70℃ to 90℃ during the second stage of mixing and mixing; Step three, N234 carbon black, N375 carbon black, KH-845-4 silane coupling agent and aromatic oil are continuously added to the internal mixer according to the proportion of the parts, and the third stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 90℃ to 110℃ during the third stage of mixing and mixing; Step four, insoluble sulfur IS60, accelerator DM, anti-reversion agent WK901 and scorch retarder CTP are added to the internal mixer according to the proportion of the parts, and the fourth stage of mixing and mixing is carried out; the temperature of the rubber material in the fourth stage of mixing and mixing is kept at 100-120℃; Step five, the mixed rubber obtained in step four is discharged from the internal mixer, and then sheeted on the open mill, cooled and parked after sheeting, and the final rubber of the tread rubber is obtained, and the parking time is 24h.

[0047] Example 4 The preparation raw materials of the synthetic rubber reinforced tread rubber provided by the embodiment are as follows in mass parts: Natural rubber Shuguang No. 2 85 parts, BR 9000 butadiene rubber 5 parts, white carbon black wet rubber 20 parts, silane coupling agent KH-845-4 3 parts, stearic acid 4 parts, zinc oxide 2 parts, processing aid ZNZB746 4 parts, protective wax RP-3 1 part, tear-resistant resin SL-6903 2 parts, antioxidant 4010NA 2.5 parts, antioxidant RD 2 parts, antioxidant BLE 0.3 parts, N234 carbon black 25 parts, N375 carbon black 20 parts, aromatic oil 4 parts, insoluble sulfur IS60 2.5 parts, accelerator DM 2 parts, anti-reversion agent WK901 1.5 parts, scorch retarder CTP 0.5 parts.

[0048] The preparation method of the synthetic rubber reinforced tread rubber provided by the embodiment comprises the following steps: Step one, the natural rubber Shuguang No. 2, BR 9000 butadiene rubber and white carbon black wet rubber are put into the internal mixer according to the proportion of the parts, and the first stage of mixing and mixing is carried out, and the temperature of the rubber material is raised to 70℃ during the first stage of mixing and mixing; Step two, stearic acid, zinc oxide, processing aid ZNZB746, protective wax RP-3, tear-resistant resin SL-6903, antioxidant 4010NA, antioxidant RD, antioxidant BLE are continuously added to the internal mixer according to the proportion of the parts, and the second stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 70℃ to 90℃ during the second stage of mixing and mixing; Step three, N234 carbon black, N375 carbon black, KH-845-4 silane coupling agent and aromatic oil are continuously added to the internal mixer according to the proportion of the parts, and the third stage of mixing and mixing is carried out, and the temperature of the rubber material is raised from 90℃ to 110℃ during the third stage of mixing and mixing; Step four, insoluble sulfur IS60, accelerator DM, anti-reversion agent WK901 and scorch retarder CTP are added to the internal mixer according to the proportion of the parts, and the fourth stage of mixing and mixing is carried out; the temperature of the rubber material in the fourth stage of mixing and mixing is kept at 100-120℃; Step five, the mixed rubber obtained in step four is discharged from the internal mixer, and then sheeted on the open mill, cooled and parked after sheeting, and the final rubber of the tread rubber is obtained, and the parking time is 24h.

[0049] Comparative Example 1 The preparation raw materials of the tread rubber provided by the comparative example include the following: Tobacco sheet glue 90 parts, white carbon black wet glue 20 parts, silane coupling agent KH-845-4 3 parts, stearic acid 4 parts, zinc oxide 2 parts, processing aid ZNZB746 4 parts, protective wax RP-3 1 part, tear-resistant resin SL-6903 2 parts, antioxidant 4010NA 2.5 parts, antioxidant RD 2 parts, antioxidant BLE 0.3 parts, N234 carbon black 25 parts, N375 carbon black 20 parts, aromatic oil 4 parts, insoluble sulfur IS60 2.5 parts, accelerator DM 2 parts, anti-reversion agent WK901 1.5 parts, anti-scorching agent CTP 0.5 parts.

[0050] The preparation method of the tread rubber of the present example includes the following steps: Step one, put the tobacco sheet glue and white carbon black wet glue into the internal mixer according to the proportion of the parts, and carry out the first stage of mixing and mixing; Step two, continue to add stearic acid, zinc oxide, processing aid ZNZB746, protective wax RP-3, tear-resistant resin SL-6903, antioxidant 4010NA, antioxidant RD, and antioxidant BLE into the internal mixer according to the proportion of the parts, and carry out the second stage of mixing and mixing; Step three, continue to add N234 carbon black, N375 carbon black, KH-845-4 silane coupling agent and aromatic oil into the internal mixer according to the proportion of the parts, and carry out the third stage of mixing and mixing; Step four, add insoluble sulfur IS60, accelerator DM, anti-reversion agent WK901 and anti-scorching agent CTP into the internal mixer according to the proportion of the parts, and carry out the fourth stage of mixing and mixing; Step five, discharge the mixing rubber obtained in step four from the internal mixer, then roll it on the open mill, cool and park it after rolling, and obtain the final rubber of the tread rubber. The parking time is 24h.

[0051] Example 2 The preparation raw materials of the synthetic rubber reinforced tread rubber provided by the present example are as follows in mass parts: Domestic natural rubber Shuguang No. 2 90 parts, white carbon black wet glue 20 parts, silane coupling agent KH-845-4 3 parts, stearic acid 4 parts, zinc oxide 2 parts, processing aid ZNZB746 4 parts, protective wax RP-3 1 part, tear-resistant resin SL-6903 2 parts, antioxidant 4010NA 2.5 parts, antioxidant RD 2 parts, antioxidant BLE 0.3 parts, N234 carbon black 25 parts, N375 carbon black 20 parts, aromatic oil 4 parts, insoluble sulfur IS60 2.5 parts, accelerator DM 2 parts, anti-reversion agent WK901 1.5 parts, anti-scorching agent CTP 0.5 parts.

[0052] The preparation method of the tread rubber of the present example includes the following steps: Step one, the natural rubber dawn No. 2 and white carbon black wet rubber are put into the internal mixer according to the proportion, and the first stage mixing and mixing are carried out; Step two, stearic acid, zinc oxide, processing aid ZNZB746, protective wax RP-3, tear resistant resin SL-6903, antioxidant 4010NA, antioxidant RD, antioxidant BLE are added into the internal mixer according to the proportion, and the second stage mixing and mixing are carried out; Step three, N234 carbon black, N375 carbon black, KH-845-4 silane coupling agent and aromatic oil are added into the internal mixer according to the proportion, and the third stage mixing and mixing are carried out; Step four, insoluble sulfur IS60, accelerator DM, anti-vulcanization reversion agent WK901 and anti-scorching agent CTP are added into the internal mixer according to the proportion, and the fourth stage mixing and mixing are carried out; Step five, the mixing rubber obtained in step four is discharged from the internal mixer, and then sheeting is carried out on the open mill, and the sheeting is cooled and parked after sheeting to obtain the final rubber of the tread, and the parking time is 24h.

[0053] The final rubber obtained in the above examples 1-4 and comparative examples 1-2 is vulcanized, and the performance test is carried out, wherein the vulcanization conditions are 150℃×45min, the test method and test results are shown in table 1.

[0054] Table 1 Performance test results

[0055] From the data in table 1, it can be concluded that the synthetic rubber reinforced tread rubber provided by the present application has certain improvement in tear strength, elongation at break, 300% modulus and elongation change after aging compared with the comparative example, especially the tear strength and the elongation change after aging performance are greatly improved, which can better meet the use requirements of aviation tires.

[0056] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A synthetic rubber reinforced tread, characterized by, The components include the following mass fractions: natural rubber 70-89 parts, synthetic rubber 1-15 parts, white carbon black wet glue 10-30 parts, silane coupling agent 1-5 parts, stearic acid 1-5 parts, zinc oxide 2-6 parts, processing aid 1-10 parts, antioxidant 1.5-8 parts, carbon black 20-50 parts, softening plasticizer 2-6 parts, insoluble sulfur 1-4 parts, accelerator 0.5-2.5 parts, anti-reversion agent 1-3 parts, anti-scorching agent 0-0.8 parts; the synthetic rubber includes one or more of ethylene-propylene-diene rubber, cis-butadiene rubber, styrene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber and isoprene rubber.

2. The synthetic rubber-reinforced tread according to claim 1, characterized in that, The natural rubber is homemade natural rubber No.

2.

3. The synthetic rubber-reinforced tread according to claim 1, characterized in that, The total mass fraction of the natural rubber and the synthetic rubber is 90 parts.

4. The synthetic rubber-reinforced tread according to claim 1, characterized in that, The carbon black includes one or more of N234, N330, N375 and N339; The silane coupling agent includes one or both of KH-845-4 and KH-560; The processing aid includes one or more of protective wax, thermal stabilizer, tear-resistant resin and processing aid ZNZB746; The antioxidant is an amine antioxidant; The softening plasticizer includes one or more of aromatic oil and naphthenic oil; The insoluble sulfur includes one or both of IS-60 and HDOT20; The accelerator includes one or more of sulfenamide accelerator and thiazole accelerator; The anti-reversion agent is anti-reversion agent WK-901; The anti-scorching agent is anti-scorching agent CTP.

5. The synthetic rubber-reinforced tread according to claim 4, characterized in that, The protective wax includes one or both of protective wax RP-3 and protective wax Okerin 1900; the thermal stabilizer is HS-80, and the tear-resistant resin is SL-6903; The sulfenamide accelerator includes one or more of accelerator DZ, accelerator CZ and accelerator NOBS; the thiazole accelerator includes one or both of accelerator DM and accelerator M; The amine antioxidant includes one or more of antioxidant 4010NA, antioxidant 4020, antioxidant RD, antioxidant S-RD, antioxidant H and antioxidant BLE.

6. The method for producing a synthetic rubber-reinforced tread according to any one of claims 1 to 5, characterized in that, The method includes the following steps: The natural rubber, the synthetic rubber and the white carbon black wet glue are first mixed and kneaded, then the stearic acid, the zinc oxide, the processing aid and the antioxidant are added for second mixing and kneading, then the carbon black, the silane coupling agent and the softening plasticizer are added for third mixing and kneading, then the insoluble sulfur, the accelerator, the anti-reversion agent and the anti-scorching agent are added for fourth mixing and kneading, then the final rubber compound of the synthetic rubber reinforced tread rubber is obtained through glue discharging, sheeting, cooling and storage in sequence.

7. The preparation method according to claim 6, characterized in that, The temperature of the glue in the first mixing and kneading is raised to 50-70℃, the temperature of the glue in the second mixing and kneading is raised from 50-70℃ to 80-90℃, and the temperature of the glue in the third mixing and kneading is raised from 80-90℃ to 100-120℃; the temperature of the glue in the fourth mixing and kneading is kept at 100-120℃; the storage time is 16-24h.

8. The preparation method according to claim 6, characterized in that, After the final rubber compound of the synthetic rubber reinforced tread rubber is obtained, the final rubber compound is vulcanized.

9. Use of the synthetic rubber-reinforced tread according to any one of claims 1 to 5 or prepared according to the method of any one of claims 6 to 8 in an aircraft tire.

10. An aircraft tire characterized in that, synthetic rubber-reinforced tread according to any one of claims 1 to 5 or prepared according to the method of any one of claims 6 to 8.

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