A rubber composition and a rubber bearing

Abstract

The present invention relates to a rubber composition and a rubber bearing, the composition comprises natural rubber, chlorinated polyethylene, a compounding agent and other additives, wherein the compounding agent comprises a first accelerator and a crosslinking vulcanizing agent, the crosslinking vulcanizing agent comprises one or more of vulcanizing agent PT75, vulcanizing agent AW160, and vulcanization accelerator BF, and the first accelerator comprises one or more of accelerator 903, S-(4,5-dihydro-5-thio-1,3,4-thiadiazole-2-yl)phenylthiocarboxylate, and triazole dimercaptoamine salt. The rubber composition of an embodiment of the present invention replaces the chloroprene rubber of the prior art with chlorinated polyethylene, and makes the natural rubber and chlorinated polyethylene compatible by using a compounding agent, so that the prepared rubber bearing can have the performance required for application; at the same time, the use of chlorinated polyethylene instead of chloroprene rubber can greatly reduce the production cost of the rubber bearing.

Description

Technical Field

[0001] The invention relates to a rubber composition, in particular to a composition which can be used for making a bridge rubber bearing. Background Art

[0002] The existing bridge rubber bearings are mainly made of chloroprene rubber, however, chloroprene rubber is not only expensive, but also has a special processing technology. Neoprene is prone to scorch during the tumbling process of the internal mixer, making the rubber material unusable. Summary of the invention

[0003] In order to overcome at least one defect of the above-mentioned prior art, in the first aspect, an embodiment of the present invention provides a rubber composition, comprising natural rubber, chlorinated polyethylene, compounding agents and other additives, wherein the compounding agents include a first accelerator and a cross-linking vulcanizing agent, and the cross-linking vulcanizing agent includes one or more of vulcanizing agent PT75, vulcanizing agent AW160, and vulcanization accelerator BF; the first accelerator includes one or more of accelerator 903, S-(4,5-dihydro-5-thioxo-1,3,4-thiadiazol-2-yl)benzenethiocarboxylate, and triazole dimercaptoamine salt.

[0004] In a second aspect, an embodiment of the present invention provides a rubber material made from the above composition.

[0005] In a third aspect, an embodiment of the present invention provides a rubber bearing comprising the above-mentioned rubber material.

[0006] The rubber composition of one embodiment of the present invention replaces the chloroprene rubber of the prior art with chlorinated polyethylene, and makes the natural rubber and the chlorinated polyethylene compatible by using a compounding agent, so that the prepared rubber bearing can have the performance required for the application; at the same time, the use of chlorinated polyethylene instead of chloroprene rubber can greatly reduce the production cost of the rubber bearing. DETAILED DESCRIPTION

[0007] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions therein are essentially used as illustrations rather than to limit the present invention.

[0008] An embodiment of the present invention provides a rubber composition, comprising natural rubber, chlorinated polyethylene, compounding agents and other additives, wherein the compounding agents include a first accelerator and a cross-linking vulcanizing agent.

[0009] In one embodiment, the rubber composition includes 100 parts by mass of natural rubber, 30 to 40 parts by mass of chlorinated polyethylene, and 5 to 20 parts by mass of compounding agents. Further, the rubber composition includes 100 parts by mass of natural rubber, 30 to 40 parts by mass of chlorinated polyethylene, and 8 to 11 parts by mass (e.g., 8.5 parts by mass, 9 parts by mass, 9.5 parts by mass, 10 parts by mass, 10.5 parts by mass) of compounding agents.

[0010] In one embodiment, the natural rubber includes one or more of Thailand No. 3 smoked sheet rubber and standard one natural rubber (WF). Among them, standard one natural rubber has small change, large tensile force, long elongation when damaged, and low price.

[0011] In one embodiment, the chlorinated polyethylene can be a product of Shandong Riko Company, for example, which has the appearance of white powder, a chlorine content of 35.24%, an ash content of 3.54, a Mooney viscosity of 89.4 ML, a Shore hardness of 51A, and an elongation at break of 947%.

[0012] In one embodiment, the crosslinking vulcanizing agent includes one or more of vulcanizing agent PT75 (or crosslinking agent PT75), vulcanizing agent AW160, and vulcanization accelerator BF (ACCEL-BF). Among them, the vulcanizing agent PT75 (or crosslinking agent PT75) is a thiadiazole derivative compound, which is suitable for the vulcanization crosslinking of low-reactive halogen rubber.

[0013] In one embodiment, the first accelerator includes one or more of Accelerator 903, FS-21, and triazole dimercaptoamine salt (FSH). FS-21 is S-(4,5-dihydro-5-thioxo-1,3,4-thiadiazol-2-yl)phenylthiocarboxylate, referred to as TDDS; and FSH is triazole dimercaptoamine salt.

[0014] In one embodiment, the cross-linking vulcanizing agent in the compound is vulcanizing agent PT75 and / or vulcanizing agent AW160, and the first accelerator is accelerator 903 and / or accelerator FS-21.

[0015] In one embodiment, the compounding agent includes 0.8 to 4.5 parts by mass of a crosslinking vulcanizing agent and 2 to 10 parts by mass of a first accelerator. For example, the amount of the crosslinking vulcanizing agent can be 3 parts by mass, 3.5 parts by mass, or 4 parts by mass; the amount of the first accelerator can be 5 parts by mass, 6 parts by mass, or 7 parts by mass. Further, the compounding agent includes 3 to 4 parts by mass of a crosslinking vulcanizing agent and 5 to 7 parts by mass of a first accelerator.

[0016] In one embodiment, the other auxiliary agent includes a second accelerator, and the second accelerator includes accelerator CZ and / or accelerator DM. Further, the amount of the second accelerator can be 2 to 3.5 parts by mass, further can be 2.5 to 3.5 parts by mass, and further can be 2.8 to 3.2 parts by mass, for example, 2.1 parts by mass, 2.2 parts by mass, 2.3 parts by mass, 2.5 parts by mass, 2.8 parts by mass, 3 parts by mass, and 3.2 parts by mass.

[0017] In one embodiment, the other auxiliary agent includes a vulcanizing agent, and the vulcanizing agent includes sulfur (such as S-80). Further, the amount of the vulcanizing agent can be 1 to 2.5 parts by mass, such as 1.2 parts by mass, 1.3 parts by mass, 1.5 parts by mass, 1.8 parts by mass, 2 parts by mass, and 2.2 parts by mass.

[0018] In one embodiment, other additives include a compatibilizer, and the use of the compatibilizer can further increase the compatibility of the chlorinated polyethylene; in the rubber composition, the content of the natural rubber is 100 parts by mass, and the content of the compatibilizer can be 3 to 5 parts by mass.

[0019] In one embodiment, the compatibilizer may be one or more of epoxidized rubber (eg, epoxidized natural rubber), isoprene liquid, polyethylene (PE), and ethylene vinyl acetate copolymer (EVA).

[0020] In one embodiment, other auxiliary agents further include one or more of an active agent, paraffin, a reinforcing agent, and a plasticizer.

[0021] In one embodiment, the rubber composition includes 100 parts by mass of natural rubber, 30-40 parts by mass of chlorinated polyethylene, 3-5 parts by mass of a compatibilizer, 5-20 parts by mass of a compounding agent, 7-15 parts by mass of an active agent (e.g., 7 parts by mass, 7.5 parts by mass, 8 parts by mass, 10 parts by mass), 2-3.5 parts by mass of a second accelerator, 1-2.5 parts by mass of a vulcanizing agent, 3-5 parts by mass of paraffin (e.g., 3.5 parts by mass, 4 parts by mass), 40-70 parts by mass of a reinforcing agent (e.g., 50 parts by mass, 55 parts by mass, 58 parts by mass, 60 parts by mass, 62 parts by mass, 65 parts by mass) and 3-7 parts by mass of a plasticizer (e.g., 4 parts by mass, 5 parts by mass, 6 parts by mass).

[0022] In one embodiment, the active agent may be one or more of magnesium oxide, zinc oxide, and stearic acid; the magnesium oxide may be nano zinc oxide, which has fine particles and a large surface area, so that it can better enhance the physical properties of the rubber.

[0023] In one embodiment, the reinforcing agent may be carbon black and / or calcium powder, such as carbon black N550 and / or N330.

[0024] In one embodiment, the plasticizer includes aromatic oil and / or pine tar oil.

[0025] In one embodiment, the rubber bearing can be made by using an existing process. For example, the preparation process of the rubber bearing includes: performing a first stage of mixing to obtain a rubber section; performing a second stage of mixing on the rubber section to obtain a rubber sheet. Furthermore, the first stage of mixing can be 8 to 10 minutes; and the second stage of mixing can be 3 to 5 minutes.

[0026] In one embodiment, the first stage of mixing includes: adding natural rubber, chlorinated polyethylene, and a compatibilizer into an internal mixer, mixing for 2 minutes, and maintaining the temperature at 65-80°C; adding small materials (active agent, first accelerator, second accelerator, cross-linking vulcanizing agent), mixing for 2 minutes, and maintaining the temperature at 90-100°C; adding large materials (reinforcing agent, plasticizer, paraffin) and mixing for 4 minutes, maintaining the temperature at 120-135°C, and debonding.

[0027] In one embodiment, the second stage mixing includes: mixing a first stage rubber and a vulcanizing agent, maintaining the temperature at 75-90° C., and after the rubber is discharged, thinning and packing on an open mixing mill for 3-5 times before unrolling.

[0028] In one embodiment, the obtained rubber sheet and steel plate can be stacked and finally covered with rubber and placed in a vulcanizer for vulcanization.

[0029] One embodiment of the present invention provides a rubber bearing, which is made from the above-mentioned rubber composition.

[0030] In one embodiment, the rubber composition may be used to make one or more of the outer skin, the surrounding rubber, and the main structure of the support.

[0031] The rubber composition of one embodiment of the present invention replaces the chloroprene rubber of the prior art with chlorinated polyethylene, and makes the natural rubber and the chlorinated polyethylene compatible through a compounding agent, so that the prepared rubber bearing can have the performance required for the application; at the same time, the use of chlorinated polyethylene instead of chloroprene rubber can greatly reduce the production cost of the rubber bearing.

[0032] Existing rubber bearings use chloroprene rubber as raw material, but chloroprene rubber is expensive, about 6 times the price of chlorinated polyethylene. The rubber composition of an embodiment of the present invention can reduce the cost of rubber bearings by using chlorinated polyethylene to replace chloroprene rubber; and the raw material does not contain chloroprene rubber, so that the scorch is controlled to a certain extent, and the processing is safer.

[0033] The rubber composition and its products according to one embodiment of the present invention are further described below in conjunction with examples. The information of some raw materials used in each example and comparative example is as follows.

[0034] 1.903: Produced by Dongguan Yuebang Rubber Technology Co., Ltd., the product name is the inorganic carrier derivative of trisnonylphenyl phosphite;

[0035] 2. PT75: produced by Shanghai Changyu Chemical Co., Ltd., the product name is a thiadiazole derivative compound;

[0036] 3.AW160: produced by Shanghai Changyu Chemical Co., Ltd.;

[0037] 4. BF: produced by Yantai Hengnuo New Materials Co., Ltd., the product name is condensation product of higher aliphatic amide and higher aliphatic secondary amine and other active ingredients;

[0038] 5. FS-21: produced by Zhejiang Huafang Pharmaceutical Co., Ltd., the product name is S-(4,5-dihydro-5-thioxo-1,3,4-thiadiazol-2-yl)phenylthiocarboxylate;

[0039] 6.FSH: Produced by Guangzhou Qiazhan Chemical Products Co., Ltd., the product name is triazole dimercaptoamine salt.

[0040] Example 1

[0041] The composition of the rubber composition used is as follows:

[0042] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of active agent (4 parts by mass of zinc oxide and 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 10.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent PT75 、 7 parts by mass of the first accelerator 903), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of the second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0043] Preparation of rubber samples

[0044] Put natural rubber, chlorinated polyethylene and epoxidized natural rubber into an internal mixer and mix for 2 minutes, keeping the temperature at 65-80°C; add small materials (activator, first accelerator, second accelerator, cross-linking vulcanizer) and mix for 2 minutes, keeping the temperature at 90-100°C; add large materials (reinforcing agent, plasticizer, paraffin) and mix for 4 minutes, keeping the temperature at 120-135°C, discharge the rubber and obtain a section of rubber.

[0045] Mix a section of rubber and sulfur and keep the temperature at 75-90℃. After the rubber is discharged, thinly pack it on an open mixing mill for 3-5 times and then it can be cut into sheets.

[0046] Example 2

[0047] The composition of the rubber composition used is as follows

[0048] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide, 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 8.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent PT75, 5 parts by mass of first accelerator FS-21), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0049] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0050] Example 3

[0051] The composition of the rubber composition used is as follows

[0052] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide, 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 9.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent PT75, 6 parts by mass of first accelerator FSH), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0053] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0054] Example 4

[0055] The composition of the rubber composition used is as follows:

[0056] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of active agent (4 parts by mass of zinc oxide and 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 10 parts by mass of compounding agent (3 parts by mass of crosslinking vulcanizing agent PT75 、 4 parts by mass of the first accelerator 903 and 3 parts by mass of the first accelerator FSH), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of the second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0057] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0058] Example 5

[0059] The composition of the rubber composition used is as follows

[0060] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide, 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 10.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent AW160, 7 parts by mass of first accelerator 903), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0061] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0062] Example 6

[0063] The composition of the rubber composition used is as follows

[0064] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide, 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 10.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent ACCEL-BF, 7 parts by mass of first accelerator 903), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0065] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0066] Example 7

[0067] The composition of the rubber composition used is as follows

[0068] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide, 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 8.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent ACCEL-BF, 5 parts by mass of first accelerator FS-21), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0069] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0070] Example 8

[0071] The composition of the rubber composition used is as follows

[0072] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide, 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 10.5 parts by mass of compounding agent (3.5 parts by mass of crosslinking vulcanizing agent ACCEL-BF, 7 parts by mass of first accelerator FSH), 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0073] The rubber sample was prepared using the same process as in Example 1 using the above composition as a raw material.

[0074] Comparative Example 1

[0075] The composition of the rubber composition used is as follows:

[0076] 77 parts by mass of natural rubber SCRWF, 30 parts by mass of chloroprene rubber 3222, 4 parts by mass of epoxidized natural rubber, 1 part by mass of light magnesium oxide, 1 part by mass of stearic acid 8160, 1.7 parts by mass of antioxidant D, 1.7 parts by mass of antioxidant 4010Na, 0.3 parts by mass of anti-scorch agent CTP, 34 parts by mass of carbon black N550, 37 parts by mass of light calcium carbonate, 3.9 parts by mass of rubber rolling oil, 0.2 parts by mass of accelerator DM, 0.5 parts by mass of accelerator CBS, 1 part by mass of sulfur, and 5 parts by mass of indirect zinc oxide BA01-05.

[0077] In this example, the rubber composition was used as a raw material and the same process as in Example 1 was adopted to prepare a rubber sample.

[0078] Comparative Example 2

[0079] The composition of the rubber composition used is as follows:

[0080] 100 parts by mass of natural rubber (standard 1), 30 parts by mass of chlorinated polyethylene, 4 parts by mass of epoxidized natural rubber, 7 parts by mass of activator (4 parts by mass of zinc oxide and 3 parts by mass of stearic acid), 3 parts by mass of paraffin, 25 parts by mass of carbon black N550, 4 parts by mass of aromatic oil, 37 parts by mass of calcium powder, 3 parts by mass of second accelerator (2.2 parts by mass of accelerator CZ, 0.8 parts by mass of accelerator DM), and 1.2 parts by mass of sulfur.

[0081] In this example, the rubber composition was used as a raw material and the same process as in Example 1 was adopted to prepare a rubber sample.

[0082] The samples prepared in the above embodiments and comparative examples were subjected to relevant performance tests. Among them, the hardness was measured by using an IRHD stand-alone hardness tester, and the tensile strength, elongation, 100% tensile stress, and 300% tensile stress were measured by using an experimental instrument electronic tensile machine. The measurement method refers to GB / T528-1998 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber. The results are shown in Table 1.

[0083] Table 1

[0084]

[0085] The samples prepared in the above-mentioned embodiments and comparative examples were tested for properties such as ozone cracking resistance, heat aging, and tearing strength. The ozone cracking resistance was measured according to GB / T 7762-2014, the heat aging performance was measured according to GBT 3512-2014, the tearing strength was measured according to GB / T529-2008 (trouser-shaped, right-angled and crescent-shaped samples), and the chlorine content was measured according to the microspectral detection of the rubber type analysis experiment. The test results are shown in Table 2.

[0086] Table 2

[0087]

[0088] According to the results in Tables 1 and 2, under the same finished product performance parameters, the ozone resistance, heat aging performance, tear strength and chlorine content of the rubber material in the embodiment of the present invention are not much different from those of the material in Comparative Example 1 of the prior art, and can completely replace the rubber material in Comparative Example 1 for preparing seismic isolation bearings of bridges. In addition, since the rubber material in the embodiment of the present invention uses chlorinated polyethylene instead of chloroprene rubber, the production cost is greatly reduced, and the scorch can be controlled to a certain extent, making the processing safer.

[0089] Furthermore, the difference between Comparative Example 2 and Example 1 is that no compounding agent is used. According to the results in Tables 1 and 2, the tensile stress, tensile strength and tear strength of the rubber material of Comparative Example 2 are significantly lower than those of the rubber material of Example 1, and the anti-aging performance of the rubber material of Comparative Example 2 is unqualified. Therefore, the use of compounding agents in the embodiments of the present invention can make the various properties of the rubber material reach a level similar to that of the rubber material using chloroprene rubber when chlorinated polyethylene is used instead of chloroprene rubber.

[0090] Furthermore, the 100% elongation stress of the rubber material that can be used as the rubber bearing is preferably 1-2 MPa, the 100% elongation stress is preferably 3.9-5 MPa, and the tensile strength is preferably above 20 MPa. Therefore, the cross-linking vulcanizing agent of one embodiment of the present invention is preferably vulcanizing agent PT75 and / or vulcanizing agent AW160, and the first accelerator is preferably accelerator 903 and / or accelerator FS-21.

[0091] Unless otherwise defined, the terms used in the present invention have the meanings commonly understood by those skilled in the art.

[0092] The embodiments described in the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various other substitutions, changes and improvements within the scope of the present invention. Therefore, the present invention is not limited to the above embodiments, but is only limited by the claims.

Claims

1. A rubber composition comprising natural rubber, chlorinated polyethylene, a compounding agent and other additives, wherein: The compounding agent includes a first accelerator and a cross-linking vulcanizing agent, wherein the cross-linking vulcanizing agent includes one or more of vulcanizing agent PT75, vulcanizing agent AW160, and vulcanization accelerator BF, and the first accelerator includes one or more of accelerator 903, S-(4,5-dihydro-5-thioxo-1,3,4-thiadiazol-2-yl)benzenethiocarboxylate, and triazole dimercaptoamine salt. 2 . The composition according to claim 1 , comprising 100 parts by mass of the natural rubber, 30 to 40 parts by mass of the chlorinated polyethylene and 5 to 20 parts by mass of the compounding agent.

3. The composition according to claim 2, wherein The other auxiliary agents include a second accelerator and a vulcanizing agent, wherein the second accelerator includes accelerator CZ and / or accelerator DM, and the vulcanizing agent includes sulfur; and / or, The compounding agent includes 0.8 to 4.5 parts by mass of the crosslinking vulcanizing agent and 2 to 10 parts by mass of the first accelerator.

4. The composition according to claim 3, wherein The compounding agent includes 3 to 4 parts by mass of the crosslinking vulcanizing agent and 5 to 7 parts by mass of the first accelerator; and / or, The other auxiliary agents include compatibilizers; and / or, The natural rubber includes one or more of Thailand No. 3 smoked rubber and Standard 1 natural rubber; and / or, The other auxiliary agents include 2 to 3.5 parts by mass of the second accelerator and 1 to 2.5 parts by mass of the vulcanizing agent.

5. The composition according to claim 4, wherein the other auxiliary agent comprises 3 to 5 parts by weight of the compatibilizer; and / or, The compatibilizer includes one or more of epoxidized rubber, isoprene, polyethylene and ethylene-vinyl acetate copolymer; and / or, The vulcanizing agent is sulfur.

6. The composition according to claim 4, wherein The other auxiliary agents also include one or more of active agents, paraffin, reinforcing agents, and plasticizers. 7 . The composition according to claim 6 , comprising 7 to 15 parts by mass of the active agent, 3 to 5 parts by mass of the paraffin wax, 40 to 70 parts by mass of the reinforcing agent, and 3 to 7 parts by mass of the plasticizer.

8. The composition according to claim 6, wherein The active agent includes one or more of magnesium oxide, zinc oxide, and stearic acid; the reinforcing agent includes carbon black and / or calcium powder; and the plasticizer includes aromatic oil and / or pine tar.

9. A rubber material made from the composition according to any one of claims 1 to 8.

10. A rubber bearing comprising the rubber material according to claim 9.

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