Sizing material composition, preparation method of rubber compound of sizing material composition and application of rubber compound in tire cap ply

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a rubber composition, a preparation method of rubber compound of the rubber composition and application of the rubber compound in a tire cap ply. The rubber composition provided by the invention comprises the following components: 100 parts of rubber base rubber, 5-8 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 2-6 parts of an anti-aging agent, 2.5-6 parts of an adhesive system, 1-2 parts of an adhesion promoter, 10-25 parts of white carbon black, 1-6 parts of a silane coupling agent, 30-70 parts of a reinforcing system, 3-8 parts of aromatic oil, 2-5 parts of a vulcanization system, 0.9-5.4 parts of a vulcanization accelerator and 0.5-2 parts of a scorch retarder. The rubber composition provided by the invention has excellent bonding performance and anti-aging performance with aramid fiber / chinlon composite cords before and after aging, the peel strength is high, meanwhile, the rubber compound is high in tensile strength, low in heat generation and excellent in tear resistance, tire tread delamination and tire burst can be prevented, the service life of an aircraft tire can be prolonged, and the safety performance of the aircraft tire can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to a rubber compound composition, a preparation method of a mixed rubber thereof, and an application in a tire crown belt layer. Background Art

[0002] Aviation tires have large loads, high speeds, large deformations, high inflation internal pressures, and special operating environments. The crown belt layer of an aviation tire is located between the tread and the belt layer, and its main function is to bind and protect the belt layer, strengthen the tire structure, improve the high-speed performance and puncture resistance of the tire, and also improve the wear resistance and anti-loss performance of the tire. Therefore, the crown belt layer is crucial for reducing dangerous situations such as delamination and tire burst of aviation tires and improving tire performance.

[0003] Since the crown belt layer is located below the tread, the centrifugal force and load impact are second only to the tread. At present, the adhesion performance between the crown belt layer rubber coating and the aramid / nylon composite cord is poor, and peeling is likely to occur; at the same time, the tensile strength is high and the tear resistance is poor, and dangerous situations such as delamination and tire burst are likely to occur. Summary of the Invention

[0004] The purpose of the present invention is to provide a rubber compound composition, a preparation method of a mixed rubber thereof, and an application in a tire crown belt layer. The rubber compound composition provided by the present invention has low heat generation when applied to the crown belt layer of a tire, and has excellent adhesion performance and peel strength with aramid / nylon composite cord before and after aging; at the same time, the rubber compound has high tensile strength and excellent tear resistance, and can effectively prevent tire tread delamination and tire burst, improving the service life and safety performance of aviation tires.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a rubber compound composition, which comprises the following raw materials in parts by mass for preparation:

[0007] 100 parts of rubber base rubber, 5 - 8 parts of zinc oxide, 1.5 - 2.5 parts of stearic acid, 2 - 6 parts of anti-aging agent, 2.5 - 6 parts of adhesive system, 1 - 2 parts of adhesion promoter, 10 - 25 parts of white carbon black, 1 - 6 parts of silane coupling agent, 30 - 70 parts of reinforcing system, 3 - 8 parts of aromatic oil, 2 - 5 parts of vulcanization system, 0.9 - 5.4 parts of vulcanization accelerator, 0.5 - 2 parts of scorch retarder; the rubber base rubber is natural rubber;

[0008] The adhesive system comprises adhesive A and adhesive RS;

[0009] The reinforcing system comprises carbon black N375 and carbon black N660;

[0010] The vulcanization system comprises insoluble sulfur and co-crosslinking agent.

[0011] Preferably, the adhesive system comprises the following components in parts by mass:

[0012] Adhesive A 1.5 - 3.5 parts, Adhesive RS 1 - 2.5 parts.

[0013] Preferably, the reinforcing system comprises the following components in parts by mass:

[0014] Carbon black N375 10 - 30 parts, Carbon black N660 20 - 40 parts.

[0015] Preferably, the vulcanization system comprises the following components in parts by mass:

[0016] Insoluble sulfur 1.5 - 3 parts, Co - crosslinking agent 0.5 - 2 parts.

[0017] Preferably, the adhesion promoter is adhesion promoter AIR - 201;

[0018] The silane coupling agent comprises one or more of silane coupling agent KH - 845 - 4, silane coupling agent Si - 69 and WD - 40;

[0019] The insoluble sulfur is insoluble sulfur IS - 60;

[0020] The co - crosslinking agent is co - crosslinking agent HV - 268;

[0021] The anti - aging agent comprises anti - aging agent 4010NA and / or anti - aging agent RD;

[0022] The vulcanization accelerator comprises one or more of accelerator DZ, accelerator DTDM and accelerator DM.

[0023] Preferably, the anti - aging agent comprises the following components in parts by mass:

[0024] Anti - aging agent 4010NA 1 - 3 parts, Anti - aging agent RD 1 - 3 parts.

[0025] Preferably, the vulcanization accelerator comprises the following components in parts by mass:.

[0026] Accelerator DZ 0.5 - 2 parts, Accelerator DTDM 0.2 - 1.6 parts, Accelerator DM 0.2 - 1.8 parts.

[0027] The present invention provides a method for preparing a mixed rubber of the rubber composition described in the above technical solution, comprising the following steps:

[0028] Mix the raw materials for preparing the rubber composition to obtain the mixed rubber of the rubber composition.

[0029] Preferably, the mixing comprises the following steps:

[0030] In the first stage, a rubber-based glue, zinc oxide, stearic acid, antioxidant, silica, silane coupling agent, reinforcing system, aromatic oil, part of the adhesive system and adhesion promoter are kneaded to obtain a first-stage kneaded rubber.

[0031] In the second stage, the first-stage kneaded rubber, vulcanization system, vulcanization accelerator, scorch retarder and the remaining adhesive system are kneaded to obtain the kneaded rubber.

[0032] The present invention provides an application of the kneaded rubber of the rubber composition described in the above technical solution or the rubber composition prepared by the preparation method described in the above technical solution in a tire crown ply.

[0033] The present invention provides a rubber composition, which comprises the following raw materials in parts by mass: 100 parts of rubber-based glue, 5 - 8 parts of zinc oxide, 1.5 - 2.5 parts of stearic acid, 2 - 6 parts of antioxidant, 2.5 - 6 parts of adhesive system, 1 - 2 parts of adhesion promoter, 10 - 25 parts of silica, 1 - 6 parts of silane coupling agent, 30 - 70 parts of reinforcing system, 3 - 8 parts of aromatic oil, 2 - 5 parts of vulcanization system, 0.9 - 5.4 parts of vulcanization accelerator, 0.5 - 2 parts of scorch retarder; the rubber-based glue is natural rubber; the adhesive system comprises adhesive A and adhesive RS; the reinforcing system comprises carbon black N375 and carbon black N660; the vulcanization system comprises insoluble sulfur and co-crosslinking agent. The present invention uses natural rubber as the base rubber, which has the characteristics of large elasticity, high modulus at a specified elongation, good tear resistance and wear resistance; the reinforcing system selects the combination of high-structure carbon black N375 and carbon black N660, which is easy to disperse, can be filled in large amounts, has good reinforcing effect, and the kneaded rubber is not prone to scorching during processing after filling, and the vulcanized rubber has high tensile strength and tear strength and low heat generation; at the same time, adhesive A, adhesive RS are combined with adhesion promoter and silica, and resinification occurs during vulcanization to form a resinification network, which forms an interpenetrating structure with the vulcanized rubber network structure, enhancing the strength of the vulcanized rubber obtained from the rubber composition and the adhesion between the rubber and the cord. Finally, the vulcanization system of the present invention uses insoluble sulfur with good dispersibility in combination with a co-crosslinking agent to improve the anti-reversion property and heat resistance of the kneaded rubber, reduce dynamic heat generation, improve the adhesion between the rubber and the cord and have good retention rate. In summary, the rubber composition provided by the present invention has excellent adhesion performance and anti-aging performance with aramid / nylon composite cord before and after aging when applied to the tire crown ply coating, high peel strength, high tensile strength of the kneaded rubber, low heat generation, and excellent tear resistance, which can prevent tire tread delamination and tire explosion, and improve the service life and safety performance of aviation tires.

[0034] Moreover, the kneaded rubber of the rubber composition provided by the present invention has a high Mooney viscosity, a large modulus at a specified elongation, and a low plasticity, which increases the stability of cord arrangement, is beneficial to the laminating processing technology of the crown ply, and improves production efficiency.

[0035] The properties of the kneaded rubber compound of the rubber compound composition provided by the present invention are shown in Table 1.

[0036] Table 1 Specific properties of the rubber compound

[0037]

[0038] Detailed implementation manners

[0039] The present invention provides a rubber compound composition, which comprises the following raw materials for preparation in parts by mass:

[0040] 100 parts of rubber base rubber, 5 - 8 parts of zinc oxide, 1.5 - 2.5 parts of stearic acid, 2 - 6 parts of antioxidant, 2.5 - 6 parts of adhesive system, 1 - 2 parts of adhesion promoter, 10 - 25 parts of white carbon black, 1 - 6 parts of silane coupling agent, 30 - 70 parts of reinforcing system, 3 - 8 parts of aromatic oil, 2 - 5 parts of vulcanization system, 0.9 - 5.4 parts of vulcanization accelerator, 0.5 - 2 parts of scorch retarder; the rubber base rubber is natural rubber;

[0041] The adhesive system comprises adhesive A and adhesive RS;

[0042] The reinforcing system comprises carbon black N375 and carbon black N660;

[0043] The vulcanization system comprises insoluble sulfur and co-crosslinking agent.

[0044] In the present invention, unless otherwise specified, all raw materials / components for preparation are commercially available products well-known to those skilled in the art.

[0045] Based on 100 parts by mass of the rubber base rubber, the rubber compound composition provided by the present invention comprises 100 parts of rubber base rubber. In the present invention, the rubber base rubber is natural rubber (NR).

[0046] Based on the mass parts of the rubber base rubber, the rubber compound composition provided by the present invention comprises 5 - 8 parts of zinc oxide, which can be 6 parts in the examples.

[0047] Based on the mass parts of the rubber base rubber, the rubber compound composition provided by the present invention comprises 1.5 - 2.5 parts of stearic acid, which can be 2 parts in the examples.

[0048] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention comprises 2 to 6 parts, preferably 2.5 to 5 parts, more preferably 3 to 4 parts of an anti-aging agent, and it can be 3.5 parts in the examples. In the present invention, the anti-aging agent preferably comprises anti-aging agent 4010NA and / or anti-aging agent RD, and it can be anti-aging agent 4010NA and anti-aging agent RD in the examples. In the present invention, the anti-aging agent preferably comprises the following components in parts by mass: 1 to 3 parts of anti-aging agent 4010NA and 1 to 3 parts of anti-aging agent RD. The anti-aging agent 4010NA is preferably 1.5 to 2 parts, and it can be 1.5 parts in the examples. The anti-aging agent RD is preferably 1.5 to 2 parts, and it can be 2 parts in the examples. The present invention uses a compound of anti-aging agent 4010NA and anti-aging agent RD, and by controlling the mass ratio of the two anti-aging agents, the anti-aging performance of the rubber compound composition can be effectively improved.

[0049] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention comprises 2.5 to 6 parts, preferably 3 to 5 parts of an adhesive system, and it can be 3 parts or 4.5 parts in the examples. In the present invention, the adhesive system comprises adhesive A and adhesive RS. In the present invention, the adhesive system preferably comprises the following components in parts by mass: 1.5 to 3.5 parts of adhesive A and 1 to 2.5 parts of adhesive RS. The adhesive A is preferably 1.5 to 3 parts, and it can be 1.5 parts or 2 parts in the examples. The adhesive RS is preferably 1.5 to 2.5 parts.

[0050] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention comprises 1 to 2 parts of an adhesion promoter, and it can be 1.5 parts or 2 parts in the examples. In the present invention, the adhesion promoter is preferably adhesion promoter AIR-201.

[0051] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention comprises 10 to 25 parts of silica, and it can be 20 parts or 15 parts in the examples.

[0052] The present invention simultaneously uses adhesive A, adhesive RS in combination with an adhesion promoter and silica, and by controlling the mass ratio relationship of adhesive A, adhesive RS, the adhesion promoter and silica, resinification can effectively occur during vulcanization, optimize the formed resinification network, optimize the formation of an interpenetrating structure with the vulcanized rubber network structure, and effectively enhance the strength of the vulcanized rubber obtained from the rubber compound composition and the adhesion between the rubber and the cord.

[0053] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention includes 1 to 6 parts of a silane coupling agent, preferably 2 to 5.5 parts, and can be 3 parts or 5 parts in the examples. In the present invention, the silane coupling agent preferably includes one or more of silane coupling agent KH-845-4, silane coupling agent Si-69 (SL-Si69), and WD-40.

[0054] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention includes 30 to 70 parts of a reinforcing system, preferably 40 to 65 parts, more preferably 45 to 60 parts, and can be 55 parts or 60 parts in the examples. In the present invention, the reinforcing system includes carbon black N375 and carbon black N660. The reinforcing system preferably includes the following components in parts by mass: 10 to 30 parts of carbon black N375 and 20 to 40 parts of carbon black N660. The carbon black N375 is preferably 15 to 25 parts and can be 20 parts or 25 parts in the examples. The carbon black N660 is preferably 35 parts.

[0055] In the present invention, the reinforcing system uses high-structure carbon black N375 and carbon black N660 in combination, and at the same time optimizes the mass ratio between the two, which can further optimize the dispersion performance of the reinforcing system in natural rubber, enhance the reinforcing effect, and it is not easy to generate scorch during the processing of the filled rubber compound. The tensile strength and tear strength of the vulcanizate are high, and the heat generation is low.

[0056] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention includes 3 to 8 parts of aromatic oil, preferably 4 to 7 parts, and can be 4 parts or 5 parts in the examples.

[0057] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention includes 2 to 5 parts of a vulcanization system, preferably 3 to 4 parts, and can be 3 parts or 3.5 parts in the examples. In the present invention, the vulcanization system includes insoluble sulfur and a co-crosslinking agent. The insoluble sulfur is preferably insoluble sulfur IS-60. The co-crosslinking agent is preferably co-crosslinking agent HV-268. In the present invention, the vulcanization system preferably includes the following components in parts by mass: 1.5 to 3 parts of insoluble sulfur and 0.5 to 2 parts of co-crosslinking agent. The insoluble sulfur is preferably 2 to 2.5 parts and can be 2 parts in the examples. The co-crosslinking agent is preferably 1 to 1.5 parts and can be 1 part or 1.5 parts in the examples.

[0058] The vulcanization system of the present invention uses insoluble sulfur with good dispersibility in combination with a co-crosslinking agent, and at the same time controls the mass ratio relationship between the co-crosslinking agent and insoluble sulfur, which can further improve the anti-reversion property and heat resistance of the rubber compound, reduce the dynamic heat generation, further improve the adhesion between the rubber and the cord and have a good retention rate.

[0059] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention includes 0.9 to 5.4 parts of a vulcanization accelerator, preferably 1 to 5 parts, more preferably 1.5 to 4 parts, and further preferably 2 to 3 parts. In the examples, it can be 2.3 parts. In the present invention, the vulcanization accelerator preferably includes one or more of accelerator DZ, accelerator DTDM, and accelerator DM. In the examples, it can be accelerator DZ, accelerator DTDM, and accelerator DM. In the present invention, the vulcanization accelerator preferably includes the following components in parts by mass: 0.5 to 2 parts of accelerator DZ, 0.2 to 1.6 parts of accelerator DTDM, and 0.2 to 1.8 parts of accelerator DM. The accelerator DZ is preferably 1.5 parts. The accelerator DTDM is preferably 0.3 to 1.5 parts, and more preferably 0.5 to 1 part. The accelerator DM is preferably 0.3 to 1 part.

[0060] The present invention uses a compound of three vulcanization accelerators, namely accelerator DZ, accelerator DTDM, and accelerator DM, and controls the mass ratio relationship of the three accelerators, which can effectively promote the formation of the network structure of the vulcanized rubber.

[0061] Based on the parts by mass of the rubber-based glue, the rubber compound composition provided by the present invention includes 0.5 to 2 parts of an anti-scorching agent, preferably 0.5 to 1 part. In the present invention, the anti-scorching agent is preferably anti-scorching agent CTP.

[0062] The present invention provides a method for preparing a mixed rubber of the rubber compound composition described in the above technical solution, including the following steps:

[0063] Mix the raw materials for preparing the rubber compound composition to obtain the mixed rubber of the rubber compound composition.

[0064] In the present invention, the mixing preferably includes the following steps:

[0065] Conduct the first-stage mixing of the rubber-based glue, zinc oxide, stearic acid, antioxidant, white carbon black, silane coupling agent, reinforcing system, aromatic oil, part of the adhesive system, and adhesion promoter to obtain a first-stage mixed rubber;

[0066] Conduct the second-stage mixing of the first-stage mixed rubber, vulcanization system, vulcanization accelerator, anti-scorching agent, and the remaining adhesive system to obtain the mixed rubber.

[0067] In the present invention, a rubber-based glue, zinc oxide, stearic acid, antioxidant, precipitated silica, silane coupling agent, reinforcing system, aromatic oil, a part of the adhesive system and adhesion promoter are subjected to first-stage mixing to obtain a first-stage mixed rubber. In the present invention, the first-stage mixing preferably includes the following steps: plasticizing the rubber-based glue to obtain a plasticized rubber-based glue; pre-mixing the plasticized rubber-based glue to obtain a pre-mixed rubber; subjecting the pre-mixed rubber, zinc oxide, stearic acid, antioxidant, a part of the adhesive system and adhesion promoter to first mixing to obtain a first mixed rubber; subjecting the first mixed rubber, precipitated silica and silane coupling agent to second mixing to obtain a second mixed rubber; subjecting the second mixed rubber, reinforcing system and aromatic oil to third mixing to obtain the first-stage mixed rubber. The plasticizing, pre-mixing, first mixing, second mixing and third mixing are all preferably carried out in an internal mixer. During the plasticizing, pre-mixing, first mixing, second mixing and third mixing, pressure mixing is preferably carried out. The pressure mixing is preferably realized by pressing down the upper ram of the internal mixer, and the pressure of the pressure mixing is preferably 0.4-0.5 MPa. The time of the plasticizing is preferably 150-200 s, the roller speed is preferably 30-40 r / min, and the temperature of the plasticizing reaches ≥140 °C. After discharging, the plasticized rubber-based glue is obtained. The time of the pre-mixing is preferably 10-30 s, the roller speed is preferably 30-40 r / min, and the temperature is preferably 75-80 °C. The part of the adhesive system is preferably adhesive RS. The time of the first mixing is preferably 40-60 s, the roller speed is preferably 30-40 r / min, and the temperature is preferably 75-80 °C. The time of the second mixing is preferably 30-40 s, the roller speed is preferably 30-40 r / min, and the temperature is preferably 75-80 °C. The time of the third mixing is preferably 60-80 s, the roller speed is preferably 30-40 r / min, and the temperature is preferably 130-150 °C. The third mixing obtains a third mixed rubber; the present invention preferably further includes successively sheeting, cooling and storing the third mixed rubber to obtain the first-stage mixed rubber. The sheeting is carried out in a calender. The storing time of the first-stage mixed rubber is preferably 16-24 h. After the storing time of the first-stage mixed rubber meets 16-24 h, subsequent second-stage mixing is carried out.

[0068] After obtaining a kneaded rubber compound, the present invention performs a second-stage kneading on the above-mentioned kneaded rubber compound, vulcanization system, vulcanization accelerator, scorch retarder, and the remaining binder system to obtain the kneaded rubber compound. In the present invention, the remaining binder system is preferably binder A. The second-stage kneading is preferably carried out in a mixer. During the second-stage kneading, pressure kneading is preferably carried out, and the pressure kneading is preferably achieved by pressing down the upper ram of the mixer. The pressure of the pressure kneading is preferably 0.4 - 0.5 MPa. The time of the second-stage kneading is preferably 80 - 100 s, the roller speed is preferably 20 - 40 r / min, and the temperature is preferably ≤100 °C. The present invention preferably further includes slicing, cooling, and storing the rubber compound obtained from the second-stage kneading in sequence to obtain the kneaded rubber compound. The slicing is carried out in a calender.

[0069] The present invention provides the application of the kneaded rubber compound of the rubber compound composition described in the above technical solution or the rubber compound composition prepared by the preparation method described in the above technical solution in the tire crown belt layer.

[0070] In the present invention, the application is preferably the application in the rubber coating of the tire crown belt layer.

[0071] In the present invention, the application preferably includes the following steps: pressing the kneaded rubber compound of the rubber compound composition to obtain a thin rubber sheet; laminating the thin rubber sheet and the cord to form a crown belt layer tire semi-finished part; forming the crown belt layer tire semi-finished part and other semi-finished parts of the tire to obtain a tire green tire; vulcanizing the tire green tire to obtain a finished tire. The cord is preferably an aramid and nylon composite cord. The forming is preferably carried out on a forming machine. The vulcanization is preferably carried out on a vulcanizer. The temperature of the vulcanization is preferably 135 - 140 °C, which can be 138 °C in the examples, and the time is preferably 80 - 100 min, which can be 90 min in the examples.

[0072] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below in conjunction with examples, but they cannot be understood as limiting the protection scope of the present invention.

[0073] Example 1:

[0074] This example provides a rubber compound composition, and the types and mass parts of its preparation raw materials are shown in Table 2.

[0075] Table 2 Formulations of the rubber compound compositions provided in Examples 1 - 2

[0076] Raw material name Example 1 (parts by mass) Example 2 (parts by mass) Natural rubber 100 100 Zinc oxide 6 6 Stearic acid 2 2 Antioxidant 4010NA 1.5 1.5 Antioxidant RD 2 2 Binder A 1.5 2 Binder RS 1.5 2.5 Adhesion promoter AIR-201 2 1.5 Silica 20 15 Silane coupling agent 5 3 Carbon black N375 20 25 Carbon black N660 35 35 Aromatic oil 4 5 Insoluble sulfur IS-60 2 2 Accelerator DZ 1.5 1.5 Accelerator DTDM 0.5 0.5 Accelerator DM 0.3 0.3 Co-crosslinking agent HV-268 1 1.5 Scorching inhibitor CTP 0.5 0.5

[0077] The preparation method of the kneaded rubber compound of the rubber compound composition provided in this example includes the following steps:

[0078] First-stage kneading:

[0079] (1) Put natural rubber into the internal mixer, apply pressure for kneading for 200 s, with the roller speed of 40 r / min, the temperature in the internal mixer chamber reaching above 140 °C, discharge the rubber, and obtain the plasticized natural rubber; put the plasticized natural rubber into the internal mixer, apply pressure for kneading (0.5 MPa) for 30 s, with the roller speed of 40 r / min and the temperature in the internal mixer chamber of 80 °C;

[0080] (2) Put zinc oxide, stearic acid, antioxidant 4010NA, antioxidant RD, adhesive RS, and adhesion promoter AIR-201 into the internal mixer, apply pressure for kneading for 60 s;

[0081] (3) Put white carbon black and silane coupling agent into the internal mixer, apply pressure for kneading for 40 s;

[0082] (4) Put carbon black N375, carbon black N660, and aromatic oil into the internal mixer, apply pressure for kneading for 80 s, control the temperature at 130 - 150 °C, then discharge the mixture from the internal mixer to the calender for sheeting, cool, and store for 24 h to obtain the first-stage mixed rubber.

[0083] Second-stage mixing:

[0084] (5) Put the first-stage mixed rubber, insoluble sulfur IS-60, co-crosslinking agent HV-268, accelerator DZ, accelerator DTDM, accelerator DM, anti-scorching agent CTP, adhesive A together with the first-stage mixed rubber into the internal mixer, apply pressure for kneading for 100 s, control the temperature below 100 °C, and the roller speed at 20 r / min;

[0085] (6) Discharge the mixture obtained in step (5) from the internal mixer to the calender for sheeting, cool, and store to obtain the mixed rubber.

[0086] Extrude the mixed rubber obtained in step (6) into thin rubber sheets with specified dimensions, use the crown ply laminating equipment to laminate and form with aramid / nylon composite cord to obtain the crown ply tire semi-finished part, then form the crown ply tire semi-finished part and other semi-finished parts of the tire on the forming machine to make the tire blank, and vulcanize the blank (138 °C × 90 min) through the vulcanizer to become the finished tire.

[0087] Example 2:

[0088] This example provides a rubber compound composition, and the types and mass parts of its preparation raw materials are shown in Table 2.

[0089] The preparation method of the mixed rubber and the finished tire of the rubber compound composition provided in this example is the same as that in Example 1.

[0090] Test Example 1

[0091] The masterbatches prepared in Example 1 and Example 2 were sampled according to the standard requirements to complete the tests, and the test results are shown in Table 3.

[0092] Table 3 Specific properties of the rubber compound

[0093]

[0094]

[0095] Comparative Example 1

[0096] It is basically the same as the formulation of the rubber compound composition provided in Example 2, except that: 100 parts of natural rubber in the formulation of the rubber compound composition provided in Example 2 is replaced with "90 parts of natural rubber + 10 parts of styrene-butadiene rubber 1500E", and the remaining preparation raw materials remain unchanged. After the test, the basic physical properties of the masterbatch are comparable, but there are obvious differences in the H extraction value, and its H extraction value is only 188.6 N / 10 mm.

[0097] Comparative Example 2

[0098] It is basically the same as the formulation of the rubber compound composition provided in Example 2, except that: "1.5 parts of adhesion promoter AIR-201 and 15 parts of white carbon black" in the formulation of the rubber compound composition provided in Example 2 is replaced with "2 parts of octylphenol formaldehyde tackifying resin", and the remaining preparation raw materials remain unchanged. After the test, there are also obvious differences in the H extraction value, and its H extraction value is 182.9 N / 10 mm.

[0099] Comparative Example 3

[0100] It is basically the same as the formulation of the rubber compound composition provided in Example 2, except that: "25 parts of carbon black N375 and 35 parts of carbon black N660" in the formulation of the rubber compound composition provided in Example 2 is replaced with "55 parts of N375 carbon black", and the remaining preparation raw materials remain unchanged. The strength of the test masterbatch is relatively high, and the hardness can reach 72, but the Mooney viscosity value is 56, and the masterbatch is relatively soft, which is not conducive to the laminating processing technology of the crown ply.

[0101] Comparative Example 4

[0102] It is basically the same as the formulation of the rubber compound composition provided in Example 2, except that: "25 parts of carbon black N375 and 35 parts of carbon black N660" in the formulation of the rubber compound composition provided in Example 2 is replaced with "10 parts of N375 carbon black and 18 parts of N660 carbon black", and the remaining preparation raw materials remain unchanged. The strength of the masterbatch becomes relatively poor, and at the same time, the hardness drops significantly to 60 °C, and the Mooney viscosity value of the masterbatch decreases.

[0103] Comparative Example 5

[0104] It is basically the same as the formulation of the rubber compound composition provided in Example 2, except that: "25 parts of carbon black N375 and 35 parts of carbon black N660" in the formulation of the rubber compound composition provided in Example 2 are replaced with "35 parts of N375 carbon black and 45 parts of N660 carbon black", and the remaining preparation raw materials remain unchanged. The strength of the mixed rubber increases limitedly, the hardness increases excessively correspondingly, and the processability of the mixed rubber also decreases, which is not conducive to the bonding process of the crown ply.

[0105] Comparative Examples 6 - 10

[0106] The formulations of the rubber compound compositions provided in Comparative Examples 6 - 10 are shown in Table 4. Among them, compared with Example 1, in Comparative Example 6, "1.5 parts of Adhesive A and 1.5 parts of Adhesive RS" in Example 1 are replaced with "3 parts of Adhesive A"; compared with Example 1, in Comparative Example 7, "1.5 parts of Adhesive A and 1.5 parts of Adhesive RS" in Example 1 are replaced with "3 parts of Adhesive RS"; compared with Example 1, in Comparative Example 8, "12 parts of adhesion promoter AIR - 201" in Example 1 are omitted; compared with Example 1, in Comparative Example 9, the amount of silica in Comparative Example 1 is modified from 20 parts in Example 1 to 5 parts, and at the same time, the amount of natural rubber oil in Example 1 is modified from 100 parts to 115 parts; compared with Example 1, in Comparative Example 10, "1 part of co - crosslinking agent HV - 268" in Example 1 is omitted.

[0107] Table 4 Formulations of the rubber compound compositions provided in Comparative Examples 6 - 10

[0108]

[0109]

[0110] The preparation methods of Comparative Examples 6 - 10 are basically the same as those of Example 1, except that the raw materials are added according to Table 4.

[0111] Test Example 2

[0112] The properties of the mixed rubbers prepared in Comparative Examples 6 - 10 were tested, and the test results are shown in Table 5.

[0113] Table 5 Specific properties of the mixed rubbers prepared in Comparative Examples 6 - 10

[0114]

[0115]

[0116] As can be seen from the data in Table 2, compared with Example 1, in Comparative Example 9, the amount of silica was reduced by 5 parts, and the remaining 15 parts were supplemented with natural rubber. The reduction of silica and the increase of natural rubber in Comparative Example 9 jointly increased the rubber content of the mixed rubber. At the same time, the reduction of silica affected the degree of crosslinking, which would reduce the H pull-out value while affecting the strength of the mixed rubber.

[0117] As can be seen from the above examples, the rubber composition provided by the present invention has high adhesion strength between the rubber before and after aging and the aramid / nylon composite cord, high rubber strength and low heat generation, can prevent the tread of the tire from delaminating and bursting, and improve the service life and safety performance of the aviation tire; moreover, the mixed rubber of the rubber composition provided by the present invention has a large Mooney viscosity, a large modulus at a specified elongation, and a low plasticity, which increases the stability of the cord arrangement and improves the production efficiency.

[0118] Although the above embodiments have made a detailed description of the present invention, they are only a part of the embodiments of the present invention, not all embodiments. Other embodiments can also be obtained according to these embodiments without creative efforts, and these embodiments all belong to the protection scope of the present invention.

Claims

1. A rubber compound composition, characterized in that, Comprising the following raw materials in parts by mass: 100 parts of rubber base rubber, 5 - 8 parts of zinc oxide, 1.5 - 2.5 parts of stearic acid, 2 - 6 parts of anti-aging agent, 2.5 - 6 parts of adhesive system, 1 - 2 parts of adhesion promoter, 10 - 25 parts of white carbon black, 1 - 6 parts of silane coupling agent, 30 - 70 parts of reinforcing system, 3 - 8 parts of aromatic oil, 2 - 5 parts of vulcanization system, 0.9 - 5.4 parts of vulcanization accelerator, 0.5 - 2 parts of scorch retarder; the rubber base rubber is natural rubber; The adhesive system includes adhesive A and adhesive RS; The reinforcing system includes carbon black N375 and carbon black N660; The vulcanization system includes insoluble sulfur and co-crosslinking agent.

2. The rubber composition according to claim 1, characterized in that, The adhesive system includes the following components in parts by mass: 1.5 - 3.5 parts of adhesive A, 1 - 2.5 parts of adhesive RS.

3. The rubber compound composition according to claim 1, wherein The reinforcing system includes the following components in parts by mass: 10 - 30 parts of carbon black N375, 20 - 40 parts of carbon black N660.

4. The rubber compound composition according to claim 1, characterized in that, The vulcanization system includes the following components in parts by mass: 1.5 - 3 parts of insoluble sulfur, 0.5 - 2 parts of co-crosslinking agent.

5. The rubber compound composition according to claim 1, characterized in that, The adhesion promoter is adhesion promoter AIR-201; The silane coupling agent includes one or more of silane coupling agent KH-845-4, silane coupling agent Si-69, and WD-40; The insoluble sulfur is insoluble sulfur IS-60; The co-crosslinking agent is co-crosslinking agent HV-268; The anti-aging agent includes anti-aging agent 4010NA and / or anti-aging agent RD; The vulcanization accelerator includes one or more of accelerator DZ, accelerator DTDM, and accelerator DM.

6. The rubber composition according to claim 1 or 5, characterized in that, The anti-aging agent includes the following components in parts by mass: 1 - 3 parts of anti-aging agent 4010NA, 1 - 3 parts of anti-aging agent RD.

7. The rubber compound composition according to claim 1 or 5, characterized in that, The vulcanization accelerator includes the following components in parts by mass: 0.5 - 2 parts of accelerator DZ, 0.2 - 1.6 parts of accelerator DTDM, 0.2 - 1.8 parts of accelerator DM.

8. A method for preparing a rubber compound of the rubber composition according to any one of claims 1 to 7, characterized in that, Including the following steps: Mix the raw materials for preparing the rubber compound composition to obtain the mixed rubber of the rubber compound composition.

9. The preparation method according to claim 8, characterized in that, The mixing includes the following steps: Conduct the first-stage mixing of the rubber base rubber, zinc oxide, stearic acid, anti-aging agent, white carbon black, silane coupling agent, reinforcing system, aromatic oil, part of the adhesive system, and adhesion promoter to obtain the first-stage mixed rubber; Conduct the second-stage mixing of the first-stage mixed rubber, vulcanization system, vulcanization accelerator, scorch retarder, and the remaining adhesive system to obtain the mixed rubber.

10. Application of the mixed rubber of the rubber compound composition according to any one of claims 1 - 7 or the rubber compound composition prepared by the preparation method according to claim 8 or 9 in the tire crown belt layer.

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