Rubber composition, preparation method thereof and damping material

Abstract

The invention provides a rubber composition, a preparation method thereof and a damping material. The rubber composition is prepared from the following raw materials in parts by mass: 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-isoprene rubber and 30 to 130 parts of auxiliaries. According to the rubber composition provided by the invention, the butadiene rubber and the butadiene-isoprene rubber are cooperatively used on the basis of the natural rubber, and by balancing the flexural property of the butadiene rubber and the tear resistance of the butadiene-isoprene rubber, the dynamic-static ratio of the rubber composition can be reduced, the service life of the rubber composition is prolonged, and a damping material with a good damping effect is obtained.

Description

Technical Field

[0001] The present application relates to the field of rubber technology, and in particular to a rubber composition, a preparation method thereof, and a shock-absorbing material. Background Art

[0002] As a key material for engineering vibration control, the development of shock-absorbing materials stems from the need for efficient absorption and dissipation of mechanical energy. In the early days, natural rubber became a basic material in the field of shock absorption due to its high elasticity (tensile strength of 25-30MPa) and low hysteresis loss. However, its weather resistance and oil resistance defects prompted the rapid iteration of synthetic rubber systems. Butyl rubber has an advantage in high-frequency vibration scenarios due to its high damping properties (loss factor > 0.3), while EPDM rubber achieves wide temperature stability (-50℃~150℃) through a saturated main chain structure, gradually forming a material spectrum covering different working conditions. The shock absorption mechanism of some of the above-mentioned shock-absorbing materials relies on the synergistic effect of viscoelastic damping and porous structure. The entropic elastic deformation of the molecular chain achieves a recoverable strain of more than 90%, while the segment friction and micropore collapse convert more than 20% of the mechanical energy into heat energy dissipation.

[0003] However, traditional shock-absorbing materials still have the problem of substandard fatigue resistance. Summary of the Invention

[0004] Based on this, it is necessary to provide a rubber composition with good fatigue resistance, a preparation method thereof, and a shock-absorbing material.

[0005] The present application provides a rubber composition, in which the raw materials include, by weight, 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-pentadiene rubber, and 30 to 130 parts of additives.

[0006] In one embodiment, the butadiene rubber is rare earth butadiene rubber, which satisfies one or more of the following conditions:

[0007] (1) The Mooney viscosity of the rare earth butadiene rubber is 55MU~65MU;

[0008] (2) The cis content of the rare earth butadiene rubber is greater than or equal to 97%;

[0009] (3) The volatile matter content of the rare earth butadiene rubber is less than or equal to 0.50wt%;

[0010] (4) The ash content of the rare earth butadiene rubber is less than or equal to 0.30wt%;

[0011] (5) The weight average molecular weight of the rare earth butadiene rubber is 280,000 to 290,000.

[0012] In one embodiment, the butadiene-pentadiene rubber satisfies one or more of the following conditions:

[0013] (1) Mooney viscosity is 70MU~120MU;

[0014] (2) Volatile matter content is less than or equal to 1.2%;

[0015] (3) Number average molecular weight is 600,000~800,000;

[0016] (4) Weight average molecular weight is 1200000~2400000;

[0017] (5) Molecular weight distribution is 1.8~3.5;

[0018] (6) The vinyl content in butadiene-pentadiene rubber is 40%~80%.

[0019] In one embodiment, the type of natural rubber includes smoked sheet rubber.

[0020] In one embodiment, the auxiliary agent includes one or more of a reinforcing agent, a peptizer, an antioxidant, an accelerator, and a vulcanizing agent.

[0021] In one embodiment, the auxiliary agent includes the reinforcing agent, the peptizer, the antioxidant, the accelerator and the vulcanizing agent in a mass ratio of (30~100):(1~10):(1~10)):(0.5~5):(0.5~5).

[0022] In one embodiment, the auxiliary agent meets one or more of the following conditions:

[0023] (1) The reinforcing agent includes one or both of fumed silica and carbon black;

[0024] (2) The peptizer includes one or more of YT-10, KN4010, M50, KA8030 and 2,2'-dibenzamidodiphenyl disulfide;

[0025] (3) The antioxidant includes one or more of N-cyclohexyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, 3100, 2,2,4-trimethyl-1,2-dihydroquinoline polymer and 2,2'-methylenebis(4-methyl-6-tert-butylphenol);

[0026] (4) The accelerator includes one or more of thiazole accelerators, sulfenamide accelerators, sulfenamide accelerators and thiuram accelerators;

[0027] (5) The vulcanizing agent includes one or more of sulfur.

[0028] The present application also provides a method for preparing a rubber composition, comprising the following steps:

[0029] Mixing raw materials to prepare a rubber compound;

[0030] The raw materials include, by mass, 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-pentadiene rubber, and 30 to 130 parts of additives.

[0031] In one embodiment, the mixing satisfies one or both of the following conditions:

[0032] (1) The mixing temperature is 60℃~90℃;

[0033] (2) The mixing time is 2 minutes to 10 minutes.

[0034] The present application provides a shock-absorbing material, comprising the rubber composition as described above or the rubber composition prepared by the above preparation method.

[0035] The present application provides a rubber composition, which is based on natural rubber and is used in combination with butadiene rubber and butadiene-vinyl rubber. By balancing the flexural properties of butadiene rubber and the tear resistance of butadiene-vinyl rubber, the dynamic-static ratio of the rubber composition can be reduced, and the rubber composition has good fatigue resistance, thereby extending the service life of the above-mentioned rubber composition and improving the fatigue resistance of the rubber composition. DETAILED DESCRIPTION

[0036] In order to facilitate understanding of the present application, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0038] As used herein, the term "and / or" includes any one of two or more of the listed items, as well as any and all combinations of the listed items. Any and all combinations include any combination of any two of the listed items, any more of the listed items, or all of the listed items. For example, "A and / or B" includes A, B, and the combination of A and B.

[0039] In this document, unless otherwise specified, "one or more" means any one of the listed items or any combination of the listed items. Similarly, "one or more" and other expressions that mean "one or more" are also understood in the same way unless otherwise specified.

[0040] Herein, terms such as "further," "further," "particularly," "for example," "such as," "example," and "for instance" are used for descriptive purposes to indicate a connection between the preceding and following technical solutions in terms of their coverage. However, they should not be construed as limiting the preceding technical solution or the scope of protection herein. Herein, unless otherwise specified, "A (such as B)" means that B is a non-limiting example of A, and it should be understood that A is not limited to B.

[0041] As used herein, "optionally," "optional," and "optional" mean optional, that is, any one of the two parallel options of "with" or "without." If multiple "optional" items appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "optional" item is independent of the other. In this application, descriptions such as "optionally contain" and "optionally include" mean "containing or not containing." "Optional component X" means the presence or absence of component X, or the presence or absence of component X.

[0042] In this document, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, "first," "second," "third," and "fourth," etc., serve only as non-exhaustive enumeration and description and should not constitute a closed-ended limitation on quantity.

[0043] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0044] As used herein, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​within the numerical interval is deemed to be continuous and includes the two numerical endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. "Numerical interval" allows for a broad range of numerical interval types including percentage intervals, ratio intervals, and ratio intervals.

[0045] Herein, the term "room temperature" or "normal temperature" generally refers to 4°C to 35°C, for example, 20°C ± 5°C. In some embodiments herein, "room temperature" or "normal temperature" refers to 10°C to 30°C. In some embodiments herein, "room temperature" or "normal temperature" refers to 20°C to 30°C.

[0046] In this document, if a method flow involves multiple steps, unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be performed in an order other than the order described. Moreover, any step can include multiple sub-steps or multiple stages, and these sub-steps or stages do not necessarily need to be completed at the same time, but can be performed at different times, and their execution order does not necessarily need to be sequential, but can be performed in rotation, alternation, or simultaneously with other steps or parts of sub-steps or stages of other steps.

[0047] The present application provides a rubber composition, in which the raw materials include, by weight, 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-pentadiene rubber, and 30 to 130 parts of additives.

[0048] The present application provides a rubber composition, which is based on natural rubber and is used in combination with butadiene rubber and butadiene-vinyl rubber. By balancing the flexural properties of butadiene rubber and the tear resistance of butadiene-vinyl rubber, the dynamic-static ratio of the rubber composition can be reduced, and the rubber composition has good fatigue resistance, thereby extending the service life of the above-mentioned rubber composition and improving the fatigue resistance of the rubber composition.

[0049] Furthermore, the rubber composition comprises, by weight, 60 to 100 parts of natural rubber, 10 to 20 parts of butadiene rubber, 20 to 30 parts of butadiene-pentadiene rubber, and 60 to 80 parts of additives.

[0050] Furthermore, the butadiene rubber is rare earth butadiene rubber. It can be understood that the rare earth butadiene rubber can be, but is not limited to, neodymium-based rare earth butadiene rubber.

[0051] In a specific example, the Mooney viscosity of the rare earth butadiene rubber is 55MU to 65MU. Specifically, the Mooney viscosity of the rare earth butadiene rubber can be, but is not limited to, 55MU, 56MU, 57MU, 58MU, 59MU, 60MU, 61MU, 62MU, 63MU, 64MU, or 65MU. The cis content of the rare earth butadiene rubber is 97% to 99.9%. The cis content of the rare earth butadiene rubber can be, but is not limited to, 97%, 97.2%, 97.4%, 97.6%, 97.8%, 98%, 98.2%, 98.4%, 98.6%, 98.8%, 99%, 99.2%, 99.4%, 99.6%, 99.8%, or 99.9%. The volatile matter content of the rare earth butadiene rubber is less than or equal to 0.5wt%. The ash content of the rare earth butadiene rubber is less than or equal to 0.3wt%. The weight average molecular weight of the rare earth butadiene rubber is 280,000 to 290,000. The weight average molecular weight of the rare earth butadiene rubber may be, but is not limited to, 280,000, 281,000, 282,000, 283,000, 284,000, 285,000, 286,000, 287,000, 288,000, 289,000, or 290,000.

[0052] In a specific example, the Mooney viscosity of the butadiene-vinyl rubber is 70 MU to 120 MU; the volatile matter content of the butadiene-vinyl rubber is less than or equal to 1.2%; the number average molecular weight of the butadiene-vinyl rubber is 650,000 to 750,000; the weight average molecular weight of the butadiene-vinyl rubber is 1,400,000 to 2,100,000; the molecular weight distribution (PDI) of the butadiene-vinyl rubber is 2.0 to 3.0, and the vinyl content of the butadiene-vinyl rubber is 40% to 80%. Specifically, the vinyl content of the butadiene-vinyl rubber can be, but is not limited to, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, or 80%.

[0053] The combination of high Mooney, high molecular weight, high cis content butadiene rubber and high vinyl content butadiene-vinyl rubber can further balance the flexural properties of butadiene rubber and the tear resistance of butadiene-vinyl rubber.

[0054] In one specific example, the type of natural rubber includes smoked sheet rubber.

[0055] In a specific example, the auxiliary agent includes one or more of a reinforcing agent, a peptizer, an antioxidant, an accelerator, and a vulcanizing agent.

[0056] In a specific example, the auxiliary agent includes a reinforcing agent, a peptizer, an antioxidant, an accelerator, and a vulcanizing agent in a mass ratio of (30-100): (1-10): (0.5-5): (0.5-5): (1-10). Further, the auxiliary agent includes a reinforcing agent, a peptizer, an antioxidant, an accelerator, and a vulcanizing agent in a mass ratio of (50-70): (2-8): (1-3): (1-3): (1-5).

[0057] In a specific example, the reinforcing agent includes one or both of fumed silica and carbon black, and further the reinforcing agent includes one or more of white carbon black C-20, carbon black 234, carbon black 330, and carbon black 660.

[0058] In a specific example, the peptizer includes one or more of YT-10, KN4010, M50, KA8030 and 2,2'-dibenzamidodiphenyl disulfide P-40 (Wuhan Jinghe Chemical Co., Ltd.).

[0059] In a specific example, the antioxidant includes one or more of N-cyclohexyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N,N-diphenyl-p-phenylenediamine, N,N-ditolyl-p-phenylenediamine, N-phenyl-N-tolyl-p-phenylenediamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer and 2,2'-methylenebis(4-methyl-6-tert-butylphenol), and further, the antioxidant includes one or more of antioxidant 4010, antioxidant 4020, antioxidant 3100, antioxidant RD and antioxidant 2246.

[0060] In one specific example, the accelerator includes one or more of a thiazole accelerator, a sulfenamide accelerator, a sulfenamide accelerator, and a thiuram accelerator. Specifically, the accelerator includes one or more of 2-mercaptobenzothiazole (accelerator M), N-cyclohexyl-2-benzothiazolesulfenamide (accelerator CZ), N-oxydiethyl-2-benzothiazolesulfenamide (accelerator NOBS), and tetramethylthiuram disulfide (accelerator TMTD).

[0061] In one specific example, the vulcanizing agent includes sulfur.

[0062] The present application also provides a method for preparing a rubber composition, comprising the following steps:

[0063] Mixing raw materials to prepare a rubber compound;

[0064] The raw materials, calculated by mass, include 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-elastomer rubber, and 30 to 130 parts of additives.

[0065] In a specific example, the mixing temperature is 60°C to 90°C.

[0066] In a specific example, the mixing time is 2 minutes to 10 minutes. It is understood that the mixing time here refers to the total time of the mixing process. The mixing process can be, but is not limited to, the time of mixing and mastication.

[0067] It can be understood that the natural rubber, butadiene rubber and butadiene-pentadiene rubber are first mixed and then mixed at a first temperature for a first time to prepare a first mixture.

[0068] The first mixture, reinforcing agent, peptizer and antioxidant are further mixed for a second time, and then subjected to a binder removal process, tableting, and then subjected to a third mixing process after standing for a third time to prepare a second mixture.

[0069] Furthermore, the second mixture, the accelerator and the vulcanizing agent are mixed for the fourth time, and after the fourth time, the mixture is subjected to a binder removal process, tabletted and allowed to stand.

[0070] The present application provides a shock-absorbing material, comprising the rubber composition as described above or the rubber composition prepared by the above preparation method.

[0071] The present application will be further described in detail below with reference to specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. For experimental methods in the following examples where specific conditions are not specified, reference should be made to the instructions provided in this application, or to experimental manuals or conventional conditions in the art, or to conditions recommended by the manufacturer, or to experimental methods known in the art.

[0072] In the following specific examples, the measured parameters of raw material components may have slight deviations within the range of weighing accuracy unless otherwise specified. For temperature and time parameters, acceptable deviations due to instrument testing accuracy or operational accuracy are allowed. "Normal temperature" refers to 25°C; "normal pressure" refers to 100 kPa or 101 kPa.

[0073] Example 1

[0074] This embodiment provides a rubber composition, including 60 parts by weight of natural rubber (3# smoked sheet rubber, Shanghai Lian Kangming Chemical Co., Ltd.), 20 parts by weight of butadiene rubber (BR9000, Shanghai Lian Kangming Chemical Co., Ltd.), 20 parts by weight of butadiene rubber (TFBI68, Zhejiang Chuanhua Synthetic Materials Co., Ltd.), 60 parts by weight of a reinforcing agent (12 parts of C-20, Anhui Aiyota Silicone Oil Co., Ltd., 48 parts of N234 Black Cat Carbon Black), 6 parts by weight of a peptizer (P-40, Wuhan Jinghe Chemical Co., Ltd.), 1.5 parts by weight of an antioxidant (4010, Zhengzhou Alpha Chemical Co., Ltd.), 1.5 parts by weight of an accelerator (CZ, Shijiazhuang Shengpeng Chemical Co., Ltd.), and 2.5 parts by weight of a vulcanizing agent (insoluble sulfur HDOT-20, Henan Kailun Chemical Co., Ltd.).

[0075] The preparation method of the rubber composition comprises the following steps:

[0076] Mixing was performed using an internal mixer at 80°C and 60 rpm. Natural rubber, butadiene rubber (BR9000, Zhejiang Chuanhua Synthetic Materials Co., Ltd.), and butadiene-vinyl rubber were first placed in the mixer and masticated for 60 seconds. A reinforcing agent, peptizer, and antioxidant were then added, followed by mixing for 120 seconds. A portion of the mix was discharged from the mixer and transferred to a two-roll mill for cooling and sheeting, where it was allowed to rest for 24 hours. The rested mix was then returned to the mixer and masticated for 60 seconds. An accelerator and vulcanizer were then added, followed by mixing for 40 seconds. The mix was then masticated on a two-roll mill for 60 seconds. The final mix was discharged from the mixer and transferred to a two-roll mill for cooling and sheeting, where it was allowed to rest for 24 hours.

[0077] Example 2

[0078] This embodiment provides a rubber composition, including 60 parts by weight of natural rubber (3# smoked sheet rubber, Shanghai Lian Kangming Chemical Co., Ltd.), 20 parts by weight of neodymium-based rare earth butadiene rubber (NdBR9106, Zhejiang Chuanhua Synthetic Materials Co., Ltd.), 20 parts by weight of butadiene-vinyl rubber (TFBI68, Zhejiang Chuanhua Synthetic Materials Co., Ltd.), 60 parts by weight of a reinforcing agent (12 parts of C-20, Anhui Aiyota Silicone Oil Co., Ltd., 48 parts of N234 Black Cat Carbon Black), 6 parts by weight of a peptizer (P-40, Wuhan Jinghe Chemical Co., Ltd.), 1.5 parts by weight of an antioxidant (4010, Zhengzhou Alpha Chemical Co., Ltd.), 1.5 parts by weight of an accelerator (CZ, Shijiazhuang Shengpeng Chemical Co., Ltd.), and 2.5 parts by weight of a vulcanizing agent (insoluble sulfur HDOT-20, Henan Kailun Chemical Co., Ltd.).

[0079] The preparation method of the rubber composition comprises the following steps:

[0080] Mixing is performed using an internal mixer at a controlled temperature of 80°C and a speed of 60 r / min. Natural rubber, NdBR9106 rare earth butyl rubber, and butadiene-vinyl rubber are first placed in the mixer chamber and plasticized for 60 seconds. A reinforcing agent, peptizer, and antioxidant are then added in sequence and mixed for 120 seconds. A section of the rubber mix in the internal mixer chamber is discharged to a two-roll mill for cooling and sheeting, and then allowed to stand for 24 hours. After standing and passing testing, the rubber mix is ​​returned to the internal mixer for plasticization for 60 seconds. An accelerator and vulcanizer are then added in sequence and mixed for 40 seconds. The final rubber mix in the internal mixer chamber is discharged to a two-roll mill for cooling and sheeting, and then allowed to stand for 24 hours.

[0081] Example 3

[0082] This embodiment provides a rubber composition, including 60 parts by weight of natural rubber (3# smoked sheet rubber, Shanghai Lian Kangming Chemical Co., Ltd.), 10 parts by weight of neodymium-based rare earth butadiene rubber (NdBR9106, Zhejiang Chuanhua Synthetic Materials Co., Ltd.), 30 parts by weight of butadiene-vinyl rubber (TFBI68, Zhejiang Chuanhua Synthetic Materials Co., Ltd.), 60 parts by weight of a reinforcing agent (12 parts of C-20, Anhui Aiyota Silicone Oil Co., Ltd., 48 parts of N234 Black Cat Carbon Black), 6 parts by weight of a peptizer (P-40, Wuhan Jinghe Chemical Co., Ltd.), 1.5 parts by weight of an antioxidant (4010, Zhengzhou Alpha Chemical Co., Ltd.), 1.5 parts by weight of an accelerator (CZ, Shijiazhuang Shengpeng Chemical Co., Ltd.), and 2.5 parts by weight of a vulcanizing agent (insoluble sulfur HDOT-20, Henan Kailun Chemical Co., Ltd.).

[0083] Comparative Example 1

[0084] This comparative example provides a rubber composition, including 60 parts by weight of natural rubber (3# smoked sheet rubber Shanghai Lian Kangming Chemical Co., Ltd.), 40 parts by weight of butadiene rubber (BR9000 Shanghai Lian Kangming Chemical Co., Ltd.), 60 parts by weight of a reinforcing agent (12 parts of C-20 Anhui Aiyota Silicone Oil Co., Ltd. and 48 parts of N234 Black Cat Carbon Black), 6 parts by weight of a peptizer (P-40 Wuhan Jinghe Chemical Co., Ltd.), 1.5 parts by weight of an antioxidant (4010 Zhengzhou Alpha Chemical Co., Ltd.), 1.5 parts by weight of an accelerator (CZ Shijiazhuang Shengpeng Chemical Co., Ltd.) and 2.5 parts by weight of a vulcanizing agent (insoluble sulfur HDOT-20 Henan Kailun Chemical Co., Ltd.).

[0085] The preparation method of the rubber composition comprises the following steps:

[0086] Mixing is performed using an internal mixer at a controlled temperature of 80°C and a speed of 60 rpm. Natural rubber and BR9000 butadiene rubber are first placed in the mixer chamber for plastication for 60 seconds. A reinforcing agent, peptizer, and antioxidant are then added in sequence and mixed for 120 seconds. A section of the rubber mix in the internal mixer chamber is discharged to a two-roll mill for cooling and sheeting, and allowed to stand for 24 hours. After standing and passing testing, the rubber mix is ​​returned to the internal mixer for plastication for 60 seconds. An accelerator and vulcanizer are then added in sequence and mixed for 40 seconds. The final rubber mix in the internal mixer chamber is discharged to a two-roll mill for cooling and sheeting, and allowed to stand for 24 hours.

[0087] Comparative Example 2

[0088] This comparative example provides a rubber composition, including 60 parts by weight of natural rubber (3# smoked sheet rubber Shanghai Lian Kangming Chemical Co., Ltd.), 40 parts by weight of butadiene-vinyl rubber (TFBI68 Zhejiang Chuanhua Synthetic Materials Co., Ltd.), 60 parts by weight of a reinforcing agent (12 parts of C-20 Anhui Aiyota Silicone Oil Co., Ltd. and 48 parts of N234 Black Cat Carbon Black), 6 parts by weight of a peptizer (P-40 Wuhan Jinghe Chemical Co., Ltd.), 1.5 parts by weight of an antioxidant (4010 Zhengzhou Alpha Chemical Co., Ltd.), 1.5 parts by weight of an accelerator (CZ Shijiazhuang Shengpeng Chemical Co., Ltd.) and 2.5 parts by weight of a vulcanizing agent (insoluble sulfur HDOT-20 Henan Kailun Chemical Co., Ltd.).

[0089] The preparation method of the rubber composition comprises the following steps:

[0090] Mixing is performed using an internal mixer at a controlled temperature of 80°C and a speed of 60 rpm. Natural rubber and butadiene-vinyl chloride (BPV) are first placed in the mixer chamber and plasticized for 60 seconds. A reinforcing agent, peptizer, and antioxidant are then added in sequence and mixed for 120 seconds. A section of the rubber mix from the mixer chamber is discharged to a two-roll mill for cooling and sheeting, where it is allowed to rest for 24 hours. After standing and passing testing, the rubber mix is ​​returned to the mixer for plasticization for 60 seconds. An accelerator and vulcanizer are then added in sequence and mixed for 40 seconds. The final rubber mix from the mixer chamber is discharged to a two-roll mill for cooling and sheeting, where it is allowed to rest for 24 hours.

[0091] The rubber compositions of the above embodiments and comparative examples were tested according to the national standards GB / T528-2009 and GB / T529-2008. The test results are shown in Table 1.

[0092] Table 1

[0093]

[0094] The vulcanized components were placed on a universal testing machine and subjected to longitudinal fatigue testing analysis for 3 million times under a constant pressure (0.6 MPa) in the fixture. The results are shown in Table 2.

[0095] Table 2

[0096]

[0097] Based on the above data, Examples 1 to 3 all exhibit good fatigue resistance. However, doping the cis-1,4-butadiene rubber with rare earth metal elements can further enhance the fatigue resistance of the rubber composition, resulting in a crack-resistant and crack-growth-resistant shock-absorbing material with excellent overall flexural resistance. The rubber composition of this application utilizes natural rubber, rare earth cis-1,4-butadiene rubber, and butadiene-pentadiene rubber to produce a shock-absorbing material with excellent fatigue resistance.

[0098] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The embodiments described above only express several implementation methods of the present application, which are convenient for understanding the technical solutions of the present application in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A rubber composition, characterized in that Calculated by mass, the raw materials include 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-elastomer rubber and 30 to 130 parts of additives.

2. The rubber composition according to claim 1, wherein The butadiene rubber is a rare earth butadiene rubber that meets one or more of the following conditions: (1) The Mooney viscosity of the rare earth butadiene rubber is 55MU~65MU; (2) The cis content of the rare earth butadiene rubber is greater than or equal to 97%; (3) The volatile matter content of the rare earth butadiene rubber is less than or equal to 0.5wt%; (4) The ash content of the rare earth butadiene rubber is less than or equal to 0.3wt%; (5) The weight average molecular weight of the rare earth butadiene rubber is 280,000 to 290,000.

3. The rubber composition according to claim 1, wherein The butadiene-pentadiene rubber meets one or more of the following conditions: (1) Mooney viscosity is 70MU~120MU; (2) Volatile matter content is less than or equal to 1.2%; (3) Number average molecular weight is 600,000~800,000; (4) Weight average molecular weight is 1200000~2400000; (5) Molecular weight distribution is 1.8~3.5; (6) The vinyl content in butadiene-pentadiene rubber is 40%~80%.

4. The rubber composition according to claim 1, wherein The types of natural rubber include smoked sheet rubber.

5. The rubber composition according to any one of claims 1 to 4, characterized in that The auxiliary agent includes one or more of a reinforcing agent, a peptizer, an antioxidant, an accelerator and a vulcanizing agent.

6. The rubber composition according to claim 5, wherein The auxiliary agent includes the reinforcing agent, the peptizer, the antioxidant, the accelerator and the vulcanizing agent in a mass ratio of (30~100):(1~10):(0.5~5):(0.5~5):(1~10).

7. The rubber composition according to claim 5, wherein The auxiliary agent meets one or more of the following conditions: (1) The reinforcing agent includes one or both of fumed silica and carbon black; (2) The peptizer includes one or more of YT-10 from Taizhou Huangyan Donghai Chemical Co., Ltd., KN4010 from Guangzhou Weida Chemical Co., Ltd., M50 from Ogaki Chemical Industry (Shanghai) Co., Ltd., and 2,2'-dibenzamidodiphenyl disulfide; (3) The antioxidant includes one or more of N-cyclohexyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer and 2,2'-methylenebis(4-methyl-6-tert-butylphenol); (4) The accelerator includes one or more of thiazole accelerators, sulfenamide accelerators, sulfenamide accelerators and thiuram accelerators; (5) The vulcanizing agent includes sulfur.

8. A method for preparing a rubber composition, characterized in that: The following steps are involved: Mixing raw materials to prepare a rubber compound; The raw materials include, by mass, 60 to 100 parts of natural rubber, 5 to 40 parts of butadiene rubber, 5 to 40 parts of butadiene-pentadiene rubber, and 30 to 130 parts of additives.

9. The preparation method according to claim 8, wherein A mix meets one or both of the following conditions: (1) The mixing temperature is 60℃~90℃; (2) The mixing time is 2 minutes to 10 minutes.

10. A shock-absorbing material, characterized in that: The invention comprises the rubber composition according to any one of claims 1 to 7 or the rubber composition prepared by the preparation method according to claim 8 or 9.

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