A high-strength rubber composition for rubber pile and preparation method thereof

Abstract

The present invention relates to the field of rubber technology, and proposes a high-strength rubber composition for rubber piles and a preparation method thereof. A high-strength rubber composition for rubber piles comprises the following components in parts by mass: 100 parts of natural rubber, 15-25 parts of carbon black, 10-20 parts of rectorite, 20-30 parts of epoxidized natural rubber modified white carbon black, 2-3 parts of vulcanizing agent, 1-2 parts of accelerator, 8-12 parts of activator, and 2-5 parts of antioxidant. Through the above technical solution, the problem of poor dispersibility of inorganic fillers in natural rubber in the related art, which leads to low strength of rubber materials, is solved.

Description

Technical Field

[0001] The present invention relates to the field of rubber technology, and in particular to a high-strength rubber composition for rubber piles and a preparation method thereof. Background Art

[0002] The rubber pile is composed of rubber material and metal material. It is a common rubber product with good extrusion resistance, wear resistance and load-bearing effects. It can be used in various fields, especially in the connection of high-speed rail carriages and the front part as a shock absorption system, which plays a shock absorption and buffering role and provides good safety and stability for the equipment.

[0003] The rubber material in the rubber pile includes raw rubber and processing aids. Raw rubber is the base material of the rubber material, including natural rubber and synthetic rubber. At present, natural rubber is generally used as the base material of the rubber material, and the strength of the rubber material is improved by adding inorganic fillers. However, the dispersion of inorganic fillers in natural rubber seriously affects the strength of the rubber material. Therefore, how to improve the dispersion of inorganic fillers in natural rubber is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The present invention provides a high-strength rubber composition for rubber piles and a preparation method thereof, which solves the problem in the related art that the inorganic filler has poor dispersibility in natural rubber, resulting in low strength of the rubber material.

[0005] The technical solution of the present invention is as follows:

[0006] A high-strength rubber composition for rubber piles comprises the following components in parts by mass: 100 parts of natural rubber, 15-25 parts of carbon black, 10-20 parts of rectorite, 20-30 parts of epoxidized natural rubber modified white carbon black, 2-3 parts of vulcanizing agent, 1-2 parts of accelerator, 8-12 parts of activator and 2-5 parts of antioxidant.

[0007] As a further technical solution, the vulcanizing agent can be any one or more vulcanizing agents in the art, preferably sulfur.

[0008] As a further technical solution, the accelerator may be any one or more accelerators in the art, preferably one or two of accelerator CZ and accelerator H.

[0009] As a further technical solution, the activator may be any one or more activators in the art, preferably one or two of zinc oxide and stearic acid.

[0010] As a further technical solution, the antioxidant includes one or both of a physical antioxidant and a chemical antioxidant; the physical antioxidant is microcrystalline paraffin, and the chemical antioxidant is one or both of antioxidant RD and antioxidant 4010NA.

[0011] As a further technical solution, the raw materials of the epoxidized natural rubber modified white carbon black include white carbon black and epoxidized natural rubber in a mass ratio of 3:0.5-1.5.

[0012] As a further technical solution, the epoxidized natural rubber includes one or more of ENR25, ENR50, and ENR75.

[0013] As a further technical solution, the mass ratio of the epoxidized natural rubber modified silica to rectorite is 25:12-17.

[0014] The present invention limits the mass ratio of epoxidized natural rubber modified silica to rectorite to 25:12-17, thereby further improving the strength of the rubber composition.

[0015] As a further technical solution, the preparation method of the epoxidized natural rubber modified white carbon black comprises the following steps: mixing white carbon black and epoxidized natural rubber evenly, reacting, and obtaining the epoxidized natural rubber modified white carbon black.

[0016] As a further technical solution, the rectorite is modifier-modified rectorite; the modifier is a compound containing a carbon-carbon double bond and a nitro group.

[0017] The present invention defines rectorite as rectorite modified by a compound containing a carbon-carbon double bond and a nitro group. After the rectorite is modified by the compound containing a carbon-carbon double bond and a nitro group, the rectorite will have a carbon-carbon double bond and a nitro group. The carbon-carbon double bond will react with the unsaturated double bond in the natural rubber during the processing of the rubber composition, thereby improving the dispersibility of the rectorite in the rubber composition. At the same time, the presence of the nitro group also promotes the dispersibility of carbon black, thereby further improving the strength of the rubber composition.

[0018] As a further technical solution, the compound containing a carbon-carbon double bond and a nitro group can be any compound containing a carbon-carbon double bond and a nitro group, preferably one or both of 4-nitrostyrene and trans-nitrostyrene.

[0019] As a further technical solution, the raw materials of the modifier-modified rectorite include the modifier and rectorite in a mass ratio of 1 to 2:20.

[0020] The present invention stipulates that the raw materials of the modifier-modified rectorite include the modifier and the rectorite in a mass ratio of 1 to 2:20, which further improves the strength of the rubber composition.

[0021] As a further technical solution, the method for preparing the modifier-modified rectorite comprises the following steps: uniformly mixing rectorite, a modifier and a solvent, performing modification, filtering and drying to obtain the modifier-modified rectorite.

[0022] As a further technical solution, the solvent includes one or both of chloroform and methanol, and the modification temperature is 30-50°C.

[0023] As a further technical solution, the mass ratio of the modifier-modified rectorite to the carbon black is 3:4.

[0024] The present invention limits the mass ratio of the modifier-modified rectorite to the carbon black to 3:4, thereby further improving the strength of the rubber composition.

[0025] The invention provides a method for preparing a high-strength rubber composition for rubber piles, comprising the following steps: after natural rubber is plasticized, epoxidized natural rubber modified white carbon black, rectorite, carbon black, an activator and an antioxidant are added for primary mixing, a vulcanizing agent and an accelerator are added for secondary mixing, and vulcanization is performed to obtain a high-strength rubber composition.

[0026] As a further technical solution, the temperature of the first mixing is 110-130°C, the rotation speed is 20-50 r / min, and the time is 5-15 min; the temperature of the second mixing is 70-90°C.

[0027] As a further technical solution, the vulcanization temperature is 140-150° C., the pressure is 7-10 MPa, and the time is 50-100 min.

[0028] The working principle and beneficial effects of the present invention are:

[0029] The present invention provides a high-strength rubber composition for rubber piles, including natural rubber, carbon black, rectorite, epoxidized natural rubber modified white carbon black, vulcanizing agent, accelerator, activator and antioxidant. Among them, carbon black, rectorite and epoxidized natural rubber modified white carbon black are used as inorganic fillers in the rubber composition, which have a reinforcing effect. After the white carbon black is grafted and modified by epoxidized natural rubber, not only the dispersibility of white carbon black in natural rubber is promoted, but also the epoxy group on the surface of epoxidized natural rubber modified white carbon black also promotes the dispersibility of carbon black and rectorite in natural rubber. The three work together to improve the strength of the rubber composition, thereby achieving the effect of improving the strength of the rubber pile. In addition, the rubber pile made of the high-strength rubber composition provided by the present invention can be used in the connection of high-speed rail carriages and the front part of the train, and has a good shock-absorbing and buffering effect. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the following examples and comparative examples:

[0032] The natural rubber is natural rubber SVRCV60;

[0033] The carbon black is carbon black N330;

[0034] The particle size of rectorite is 800 mesh;

[0035] The white carbon black is fumed white carbon black Cabot M5, with a particle size of 8000 mesh, and is dried at 100°C for 20 hours for use;

[0036] The microcrystalline wax was Rhein Chemie 654.

[0037] Example 1

[0038] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0039] S2. After 100 parts of natural rubber were plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 10 parts of rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD were added, and the mixture was kneaded at 120° C. and 35 r / min for 10 min. The mixture was cooled to 80° C., 2.5 parts of sulfur and 1.5 parts of accelerator CZ were added, and the mixture was continued to be kneaded. The mixture was vulcanized at 145° C. and 8 MPa for 70 min to obtain a rubber composition.

[0040] Example 2

[0041] S1. After 15 parts of ENR25 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0042] S2. After plasticizing 100 parts of natural rubber, add 20 parts of epoxidized natural rubber modified white carbon black, 10 parts of rectorite, 15 parts of carbon black, 1 part of stearic acid, 7 parts of zinc oxide, and 2 parts of antioxidant RD, and mix at 110°C and 20r / min for 15min. Cool to 70°C, add 2 parts of sulfur and 1 part of accelerator H, and continue mixing. Vulcanize at 140°C and 10MPa for 50min to obtain a rubber composition.

[0043] Example 3

[0044] S1. After 5 parts of ENR75 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0045] S2. After 100 parts of natural rubber were plasticized, 30 parts of epoxidized natural rubber modified white carbon black, 10 parts of rectorite, 15 parts of carbon black, 3 parts of stearic acid, 9 parts of zinc oxide, and 5 parts of antioxidant 4010NA were added, and the mixture was kneaded at 130°C and 50 r / min for 5 min. The mixture was cooled to 90°C, 3 parts of sulfur and 2 parts of accelerator H were added, and the mixture was continued to be kneaded. The mixture was vulcanized at 150°C and 7 MPa for 100 min to obtain a rubber composition.

[0046] Example 4

[0047] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0048] S2. After 100 parts of natural rubber were plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 12 parts of rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD were added, and the mixture was kneaded at 120° C. and 35 r / min for 10 min. The mixture was cooled to 80° C., 2.5 parts of sulfur and 1.5 parts of accelerator CZ were added, and the mixture was continued to be kneaded. The mixture was vulcanized at 145° C. and 8 MPa for 70 min to obtain a rubber composition.

[0049] Example 5

[0050] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0051] S2. After 100 parts of natural rubber were plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD were added, and the mixture was kneaded at 120° C. and 35 r / min for 10 min. The mixture was cooled to 80° C., 2.5 parts of sulfur and 1.5 parts of accelerator CZ were added, and the mixture was continued to be kneaded. The mixture was vulcanized at 145° C. and 8 MPa for 70 min to obtain a rubber composition.

[0052] Example 6

[0053] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0054] S2. After 100 parts of natural rubber were plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 17 parts of rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD were added, and the mixture was kneaded at 120° C. and 35 r / min for 10 min. The mixture was cooled to 80° C., 2.5 parts of sulfur and 1.5 parts of accelerator CZ were added, and the mixture was continued to be kneaded. The mixture was vulcanized at 145° C. and 8 MPa for 70 min to obtain a rubber composition.

[0055] Example 7

[0056] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0057] S2. After 100 parts of natural rubber were plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 20 parts of rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD were added and kneaded at 120°C and 35 r / min for 10 min. The temperature was lowered to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ were added and kneaded continuously. The mixture was vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0058] Example 8

[0059] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0060] S2, dissolving 0.5 parts of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing by ultrasonic at 40° C. for 30 min, filtering, and drying to obtain modifier-modified rectorite;

[0061] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0062] Example 9

[0063] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0064] S2, dissolving 1 part of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing by ultrasonic at 40° C. for 30 min, filtering, and drying to obtain a modifier-modified rectorite;

[0065] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0066] Example 10

[0067] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0068] S2, dissolving 1.5 parts of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing ultrasonically at 40° C. for 30 min, filtering, and drying to obtain a modifier-modified rectorite;

[0069] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0070] Embodiment 11

[0071] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0072] S2, dissolving 2 parts of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing by ultrasonic at 40°C for 30 minutes, filtering, and drying to obtain modifier-modified rectorite;

[0073] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0074] Example 12

[0075] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0076] S2, dissolving 2.5 parts of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing ultrasonically at 40° C. for 30 min, filtering, and drying to obtain a modifier-modified rectorite;

[0077] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0078] Embodiment 13

[0079] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0080] S2, dissolving 1.5 parts of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing ultrasonically at 40° C. for 30 min, filtering, and drying to obtain a modifier-modified rectorite;

[0081] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 20 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0082] Embodiment 14

[0083] S1. After 10 parts of ENR50 were plasticized at 170°C for 1 minute, 30 parts of white carbon black were added and reacted for 20 minutes, and then the material was discharged to obtain epoxidized natural rubber modified white carbon black;

[0084] S2, dissolving 1.5 parts of 4-nitrostyrene in 200 parts of methanol, adding 20 parts of rectorite, mixing ultrasonically at 40° C. for 30 min, filtering, and drying to obtain a modifier-modified rectorite;

[0085] S3. After 100 parts of natural rubber are plasticized, 25 parts of epoxidized natural rubber modified white carbon black, 15 parts of modified rectorite, 25 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD are added, and the mixture is kneaded at 120°C and 35 r / min for 10 min. The mixture is cooled to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ are added, and the mixture is continued to be kneaded. The mixture is vulcanized at 145°C and 8 MPa for 70 min to obtain a rubber composition.

[0086] Comparative Example 1

[0087] After 100 parts of natural rubber were plasticized, 25 parts of white carbon black, 10 parts of rectorite, 15 parts of carbon black, 2 parts of stearic acid, 8 parts of zinc oxide, 1 part of microcrystalline wax, and 2.5 parts of antioxidant RD were added and kneaded at 120°C and 35 r / min for 10 minutes. The temperature was lowered to 80°C, 2.5 parts of sulfur and 1.5 parts of accelerator CZ were added and kneaded continuously. The rubber composition was vulcanized at 145°C and 8 MPa for 70 minutes to obtain a rubber composition.

[0088] The rubber compositions obtained in Examples 1 to 14 and Comparative Example 1 were cut into 1A dumbbell-shaped specimens according to the method in GB / T 528-2009 for tensile strength testing, and were cut into trouser-shaped specimens according to the method in GB / T 529-2008 for tear strength testing. The test results are recorded in Table 1.

[0089] Table 1 Tensile strength and tear strength of rubber composition

[0090]

[0091] It can be seen from Table 1 that the rubber composition provided by the present invention has high tensile strength and tear strength.

[0092] Compared with Comparative Example 1, Examples 1 to 14 add epoxidized natural rubber modified silica, while Comparative Example 1 adds unmodified silica. The tensile strength and tear strength of the rubber compositions obtained in Examples 1 to 14 are higher than those in Comparative Example 1, indicating that epoxidized natural rubber modified silica can improve the strength of the rubber composition.

[0093] The tensile strength and tear strength of the rubber compositions obtained in Examples 4 to 6 are higher than those in Example 1 and Example 7, indicating that the mass ratio of epoxidized natural rubber-modified silica to rectorite is 25:12 to 17, which can further improve the strength of the rubber composition.

[0094] The tensile strength and tear strength of the rubber compositions obtained in Examples 8 to 12 are higher than those in Example 5, indicating that the rectorite modified by the compound containing a carbon-carbon double bond and a nitro group can further improve the strength of the rubber composition. In addition, the tensile strength and tear strength of the rubber compositions obtained in Examples 9 to 11 are higher than those in Examples 8 and 12, indicating that the mass ratio of the compound containing a carbon-carbon double bond and a nitro group to the rectorite is 1 to 2:20, which can further improve the strength of the rubber composition.

[0095] The tensile strength and tear strength of the rubber composition obtained in Example 13 are higher than those in the other examples, indicating that the mass ratio of the rectorite modified with a compound containing a carbon-carbon double bond and a nitro group to carbon black is 3:4, which can further improve the strength of the rubber composition.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength rubber composition for rubber piles, It is characterized in that The invention comprises the following components in parts by mass: 100 parts of natural rubber, 15-25 parts of carbon black, 10-20 parts of rectorite, 20-30 parts of epoxidized natural rubber modified white carbon black, 2-3 parts of vulcanizing agent, 1-2 parts of accelerator, 8-12 parts of activator and 2-5 parts of antioxidant, wherein the rectorite is modifier-modified rectorite; and the modifier is one or both of 4-nitrostyrene and trans-nitrostyrene.

2. A high-strength rubber composition for rubber pile according to claim 1, It is characterized in that The raw materials of the epoxidized natural rubber modified white carbon black include white carbon black and epoxidized natural rubber in a mass ratio of 3:0.5-1.

5.

3. A high-strength rubber composition for rubber pile according to claim 2, It is characterized in that The epoxidized natural rubber includes one or more of ENR25, ENR50 and ENR75.

4. The high-strength rubber composition for rubber pile according to claim 1, It is characterized in that The mass ratio of the epoxidized natural rubber modified silica to rectorite is 25:12-17.

5. A high-strength rubber composition for rubber pile according to claim 2, It is characterized in that The preparation method of epoxidized natural rubber modified white carbon black comprises the following steps: mixing white carbon black and epoxidized natural rubber evenly, reacting, and obtaining epoxidized natural rubber modified white carbon black.

6. The high-strength rubber composition for rubber pile according to claim 1, It is characterized in that The raw materials of the modifier-modified rectorite include the modifier and rectorite in a mass ratio of 1 to 2:

20.

7. A high-strength rubber composition for rubber pile according to claim 6, It is characterized in that The preparation method of the modifier-modified rectorite comprises the following steps: uniformly mixing rectorite, a modifier and a solvent, performing modification, filtering and drying to obtain the modifier-modified rectorite.

8. The high-strength rubber composition for rubber pile according to claim 1, It is characterized in that The mass ratio of the modifier-modified rectorite to the carbon black is 3:

4.

9. A method for preparing a high-strength rubber composition for rubber pile according to any one of claims 1 to 8, It is characterized in that The following steps are involved: After the natural rubber is plasticized, epoxidized natural rubber modified white carbon black, rectorite, carbon black, activator and antioxidant are added for primary mixing, and a vulcanizing agent and accelerator are added for secondary mixing, and vulcanization is performed to obtain a high-strength rubber composition.

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