High-and-low-temperature-resistant nitrile rubber for sealing high-pressure oil cylinder rod, preparation method of nitrile rubber and sealing ring for rod

Abstract

The invention relates to the technical field of rubber, in particular to high and low temperature resistant nitrile rubber for sealing a high-pressure oil cylinder rod, a preparation method and a sealing ring for the rod. The high and low temperature resistant nitrile rubber for sealing the high-pressure oil cylinder rod is prepared from the following components in parts by weight: 100.0 parts of raw rubber, 110.0 to 150.0 parts of carbon black, 5.0 parts of zinc oxide, 1.5 parts of stearic acid, 18.0 to 22.0 parts of plasticizer DOZ, 1.5 parts of anti-aging agent, 1.0 part of antioxidant, 1.0 part of oleamide, 2.0 to 4.0 parts of accelerant benzoic acid, 2.0 to 2.5 parts of accelerant TBT, 2.0 to 4.0 parts of accelerant DM and 1.5 to 2.0 parts of vulcanizing agent VULCAR. By adding a proper amount of plasticizer DOZ, the butadiene-acrylonitrile rubber meets the low-temperature resistance, and meanwhile, the hardness and tensile strength are guaranteed; by adding a proper amount of vulcanizing agent VULCAR, the hardness and tensile strength of the nitrile rubber are further ensured; according to the high and low temperature resistant nitrile rubber for sealing the high-pressure oil cylinder rod, disclosed by the invention, the components are reasonably proportioned, so that the nitrile rubber has excellent physical properties and is suitable for a high and low temperature use environment of a high-pressure oil cylinder at the temperature of 50 DEG C below zero to 120 DEG C.

Description

Technical Field

[0001] The invention relates to the technical field of rubber, in particular to a high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal and a preparation method thereof, and a sealing ring for the rod. Background Art

[0002] Rod seals are key components of high-pressure cylinder piston rod seals. Their performance is related to the stability of the entire hydraulic system. The operating conditions of high-pressure cylinders: pressure ≤ 35Mpa, speed

[0003] ≤500mm / s, stroke ≤12 meters, service life three years, operating temperature range: -50~120℃. This operating condition has higher performance requirements on the material of the rod sealing ring.

[0004] The rubber material of the high-pressure rod sealing ring currently on the market is resistant to high pressure: hardness 85±5, tensile strength Tb≥16Mpa, and can meet the requirements of use at -30 to 120°C; however, under the use conditions of -50 to -30°C, the rubber material will lose its elasticity, which will cause the seal of the high-pressure cylinder piston rod to fail, resulting in the risk of oil leakage in the high-pressure cylinder. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a high-temperature resistant nitrile rubber for high-pressure oil cylinder rod seal and a preparation method and a rod seal ring. The high-temperature resistant nitrile rubber for high-pressure oil cylinder rod seal has the physical performance requirements of the high-pressure oil cylinder under high and low temperature environments of -50 to 120°C, especially under low temperature conditions of -50 to -30°C, the rubber material will not lose its elasticity.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal, comprising the following components in parts by weight:

[0008] Raw rubber: 100.0 parts,

[0009] Carbon black: 110.0-150.0 parts,

[0010] Zinc oxide: 5.0 parts,

[0011] Stearic acid: 1.5 parts,

[0012] Plasticizer DOZ: 18.0~22.0 parts,

[0013] Anti-aging agent: 1.5 parts,

[0014] Antioxidant: 1.0 parts,

[0015] Oleic acid amide: 1.0 parts,

[0016] Accelerator benzoic acid: 2.0-4.0 parts,

[0017] Accelerator TBT: 2.0-2.5 parts,

[0018] Accelerator DM: 2.0~4.0 parts,

[0019] Vulcanizing agent VULCAR: 1.5-2.0 parts.

[0020] Furthermore, the high- and low-temperature resistant nitrile rubber for high-pressure oil cylinder rod seal comprises the following components in parts by weight:

[0021] Raw rubber: 100.0 parts,

[0022] Carbon black: 120.0 parts,

[0023] Zinc oxide: 5.0 parts,

[0024] Stearic acid: 1.5 parts,

[0025] Plasticizer DOZ: 20.0 parts,

[0026] Anti-aging agent: 1.5 parts,

[0027] Antioxidant: 1.0 parts,

[0028] Oleic acid amide: 1.0 parts,

[0029] Accelerator benzoic acid: 3.0 parts,

[0030] Accelerator TBT: 2.3 parts,

[0031] Accelerator DM: 3.0 parts,

[0032] Curing agent VULCAR: 1.8 parts.

[0033] Furthermore, the brand of the raw rubber is N260S.

[0034] Furthermore, the grade of the carbon black is N550.

[0035] A method for preparing the high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal as mentioned above specifically comprises the following steps:

[0036] Step S1, adding raw rubber into an internal mixer for a first internal mixing;

[0037] Step S2, continue to add zinc oxide, stearic acid, antioxidant, antioxidant, oleic acid amide, and accelerator benzoic acid, and perform secondary mixing;

[0038] Step S3, continue to add carbon black and plasticizer DOZ, and then knead for three times;

[0039] Step S4, reversing the internal mixing, cleaning and removing the glue after the internal mixing is completed, so as to obtain a mixed rubber;

[0040] Step S5, adding the mixed rubber into an open mill, adding a vulcanizing agent VULCAR, an accelerator TBT and an accelerator DM after the mixed rubber is rolled, and performing open milling to obtain a high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal.

[0041] Furthermore, the mixer speed is 30 rpm, the initial mixer temperature is 60° C., the first mixer time is 1 min, the second mixer time is 1.5 min, the third mixer time is 1.5 min, the reverse mixer time is 20 s, and the cleaning time after the mixer is completed is 1 min.

[0042] Furthermore, the rotation speed of the mixing mill is set to 22 rpm, and the roller temperature is set to 38°C.

[0043] A rod sealing ring, which is sleeved on the piston rod of a high-pressure oil cylinder, comprises an annular body, the right end face of the annular body is a plane end face, and the left end face of the annular body is provided with a U-shaped groove, the U-shaped groove divides the left end face into an inner lip and an outer lip, and the inner lip is arranged close to the piston rod of the high-pressure oil cylinder; the rod sealing ring is made of the high and low temperature resistant nitrile rubber for the high-pressure oil cylinder rod seal.

[0044] Furthermore, the inner lip height H2 is smaller than the outer lip height H1.

[0045] The beneficial effects of the present invention are as follows: the present invention has reasonable design and simple preparation method; by adding a proper plasticizer DOZ, the nitrile rubber satisfies the low temperature resistance while ensuring the hardness and tensile strength; by adding a proper vulcanizing agent VULCAR, the hardness and tensile strength of the nitrile rubber are further guaranteed; the high and low temperature resistant nitrile rubber for the high pressure oil cylinder rod seal of the present invention has excellent physical properties through reasonable proportioning of each component, and is suitable for the high and low temperature use environment of the high pressure oil cylinder at -50°C to 120°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a schematic diagram of the cross-sectional structure of a rod sealing ring according to an embodiment of the present invention.

[0048] In the figure: 1. annular body, 2. U-shaped groove, 3. inner lip, 4. outer lip. DETAILED DESCRIPTION

[0049] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this description, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0052] A high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal, comprising the following components in parts by weight:

[0053] Raw rubber: 100.0 parts,

[0054] Carbon black: 110.0-150.0 parts,

[0055] Zinc oxide: 5.0 parts,

[0056] Stearic acid: 1.5 parts,

[0057] Plasticizer DOZ: 18.0~22.0 parts,

[0058] Anti-aging agent: 1.5 parts,

[0059] Antioxidant: 1.0 parts,

[0060] Oleic acid amide: 1.0 parts,

[0061] Accelerator benzoic acid: 2.0-4.0 parts,

[0062] Accelerator TBT: 2.0-2.5 parts,

[0063] Accelerator DM: 2.0~4.0 parts,

[0064] Vulcanizing agent VULCAR: 1.5-2.0 parts.

[0065] The brand of raw rubber is N260S (manufacturer: JSR), the manufacturer of antioxidant is Senao Chemical, the brand of carbon black is N550 (manufacturer: CABOT), the manufacturer of plasticizer DOZ is Japan Tiangang, the manufacturer of vulcanizer VULCAR is Toyo Chemical, and the manufacturer of accelerator benzoic acid is Baiyite

[0066] The present invention also discloses a preparation method for preparing the high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal, which specifically comprises the following steps:

[0067] Step S1: Add the raw rubber into the internal mixer for a mixing process.

[0068] Step S2, continue to add zinc oxide, stearic acid, antioxidant, antioxidant, oleic acid amide, and accelerator benzoic acid, and perform secondary mixing;

[0069] Step S3, continue to add carbon black and plasticizer DOZ, and then knead for three times;

[0070] Step S4, reversing the internal mixing, cleaning and removing the glue after the internal mixing is completed, so as to obtain a mixed rubber;

[0071] Step S5, adding the mixed rubber into an open mill, adding a vulcanizing agent VULCAR, an accelerator TBT and an accelerator DM after the mixed rubber is rolled, and performing open milling to obtain a high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal.

[0072] The speed of the internal mixer is 30 rpm, the initial internal mixing temperature is 60°C, the first internal mixing time is 1 min, the second internal mixing time is 1.5 min, the third internal mixing time is 1.5 min, the reverse internal mixing time is 20 s, and the cleaning time after the internal mixing is 1 min.

[0073] The mill speed was set at 22 rpm and the roll temperature was set at 38°C.

[0074] like Figure 1 As shown, the present invention also discloses a rod sealing ring, comprising an annular body 1, the right end face of the annular body 1 is a plane end face, the left end face of the annular body 1 is provided with a U-shaped groove 2, the U-shaped groove 2 separates the left end face into an inner lip 3 and an outer lip 4, the inner lip 3 is arranged close to the high-pressure cylinder piston rod; the rod sealing ring is made of the high and low temperature resistant nitrile rubber for the high-pressure cylinder rod seal.

[0075] The height H2 of the inner lip 3 is smaller than the height H1 of the outer lip 4 .

[0076] Example 1

[0077] The speed of the internal mixer was set to 30 rpm, and the initial temperature was set to 60°C. In the first step, 100 parts of raw rubber (JSRN260S) were internally kneaded in the internal mixer for 1 min. In the second step, 5 parts of zinc oxide (commercially available), 1.5 parts of stearic acid (commercially available), 1.5 parts of antioxidant, 1 part of antioxidant, 1 part of oleic acid amide, and 3 parts of accelerator benzoic acid were added. In the third step, 120 parts of carbon black (Cabot N550) and 20 parts of plasticizer DOZ were added, and the internal kneading was continued for 1.5 min. In the fourth step, the internal kneading was reversed for 20 s. After the internal kneading was completed, the rubber was cleaned for 1 min, and the rubber was discharged to obtain the mixed rubber.

[0078] The open mill was set to rotate at 22 rpm and the roller temperature was 38°C. The mixed rubber was added to the open mill to make it roll, with 1.8 parts of vulcanizer VULCAR, 2.3 parts of accelerator TBT, and 3 parts of accelerator DM. The left and right knives were cut 5 times, and the triangle package was made 6 times. Finally, the nitrile rubber was unrolled to obtain the nitrile rubber.

[0079] Comparative Example 1

[0080] The difference between Comparative Example 1 and Example 1 is that "plasticizer DOZ" is replaced by "plasticizer DOS", and the added amount of plasticizer DOS is still 20 parts.

[0081] Comparative Example 2

[0082] The difference between Comparative Example 2 and Example 1 is that "plasticizer DOZ" is replaced by "plasticizer RS107", and the added amount of plasticizer RS107 is still 20 parts.

[0083] Physical properties of Example 1, Comparative Example 1 and Comparative Example 2 were tested, and the test results are shown in Table 1.

[0084] Table 1 Physical property test results of Example 1, Comparative Example 1 and Comparative Example 2

[0085]

[0086] The freezing points and boiling points of plasticizer DOZ, plasticizer DOS and plasticizer RS107 are shown in Table 2.

[0087] Table 2 Solidification and boiling points of plasticizers DOZ, DOS and RS107

[0088] model DOZ DOS RS-107 Freezing point / ℃ -65 -48 -47 Boiling point / ℃ 376 256 405

[0089] As shown in Table 1, from Comparative Example 1, the plasticizer DOS has a greater negative impact on the hardness and tensile properties of the rubber. After adding the plasticizer DOS, the tensile strength of the nitrile rubber vulcanizate decreases and the elongation at break decreases. As for the aging resistance of the rubber, the plasticizer DOS will cause the change rate of the tensile strength of the rubber in 46# hydraulic oil to exceed the application standard requirements.

[0090] It can be seen from Comparative Example 2 that plasticizer RS107 has a greater negative impact on the aging resistance and oil resistance of rubber. After adding plasticizer RS107, the tensile strength and elongation at break of nitrile rubber vulcanizate are slightly lower than those of the DOZ plasticizing system in Example 1, but the aging resistance and oil resistance of rubber (tensile strength change rate in 46# hydraulic oil) are greatly reduced, and the performance parameters exceed the application standard requirements.

[0091] Combining Table 1 and Table 2, it can be seen that the DOZ in Example 1 has a lower freezing point, giving the mixed rubber a lower low-temperature resistance; at the same time, DOZ has a higher boiling point, which can improve the stability and heat resistance of the mixed rubber, so that various indicators in high-temperature oil resistance and hot air can meet the requirements.

[0092] Example 2

[0093] The speed of the internal mixer was set to 30 rpm, and the initial temperature was set to 60°C. In the first step, 100 parts of raw rubber (JSRN260S) were internally kneaded in the internal mixer for 1 min. In the second step, 5 parts of zinc oxide (commercially available), 1.5 parts of stearic acid (commercially available), 1.5 parts of antioxidant, 1 part of antioxidant, 1 part of oleamide, and 3 parts of benzoic acid were added. In the third step, 120 parts of carbon black (Cabot N550) and 18 parts of plasticizer DOZ were added, and the internal kneading was continued for 1.5 min. In the fourth step, the internal kneading was reversed for 20 s. After the internal kneading was completed, the rubber was cleaned for 1 min, and the rubber was discharged to obtain the mixed rubber.

[0094] The open mill was set to rotate at 22 rpm and the roller temperature was 38°C. The mixed rubber was added to the open mill to make it roll, with 1.8 parts of vulcanizer VULCAR, 2.3 parts of accelerator TBT, and 3 parts of accelerator DM. The left and right knives were cut 5 times, and the triangle package was made 6 times. Finally, the nitrile rubber was unrolled to obtain the nitrile rubber.

[0095] Example 3

[0096] The speed of the internal mixer was set to 30 rpm, and the initial temperature was set to 60°C. In the first step, 100 parts of raw rubber (JSRN260S) were internally kneaded in the internal mixer for 1 min. In the second step, 5 parts of zinc oxide (commercially available), 1.5 parts of stearic acid (commercially available), 1.5 parts of antioxidant, 1 part of antioxidant, 1 part of oleamide, and 3 parts of benzoic acid were added. In the third step, 120 parts of carbon black (Cabot N550) and 22 parts of plasticizer DOZ were added, and the internal kneading was continued for 1.5 min. In the fourth step, the internal kneading was reversed for 20 s. After the internal kneading was completed, the rubber was cleaned for 1 min, and the rubber was discharged to obtain the mixed rubber.

[0097] The open mill was set to rotate at 22 rpm and the roller temperature was 38°C. The mixed rubber was added to the open mill to make it roll, with 1.8 parts of vulcanizer VULCAR, 2.3 parts of accelerator TBT, and 3 parts of accelerator DM. The left and right knives were cut 5 times, and the triangle package was made 6 times. Finally, the nitrile rubber was unrolled to obtain the nitrile rubber.

[0098] The physical properties of Example 1, Example 2 and Example 3 were tested, and the test results are shown in Table 3.

[0099] Table 3 Physical property test results of Example 1, Example 2 and Example 3

[0100]

[0101] As shown in Table 3, the nitrile rubber made from the components in Example 1 has excellent physical properties and can meet the high and low temperature use environment of -50°C to 120°C, and is the most preferred embodiment of the present invention.

[0102] When 18 parts of plasticizer DOZ were added in Example 2, the low temperature resistance and elongation at break of the prepared nitrile rubber would slightly decrease, and the tensile strength and hardness would slightly increase. When 22 parts of plasticizer DOZ were added in Example 3, the performances were opposite, but all within the target range.

[0103] The present invention adopts plasticizer DOZ because the plasticizer DOZ is distributed between macromolecular chains, can reduce the intermolecular force, and endow the rubber with more softness, elasticity and low temperature resistance.

[0104] Example 4

[0105] The speed of the internal mixer was set to 30 rpm, and the initial temperature was set to 60°C. In the first step, 100 parts of raw rubber (JSRN260S) were internally kneaded in the internal mixer for 1 min. In the second step, 5 parts of zinc oxide (commercially available), 1.5 parts of stearic acid (commercially available), 1.5 parts of antioxidant, 1 part of antioxidant, 1 part of oleamide, and 3 parts of benzoic acid were added. In the third step, 120 parts of carbon black (Cabot N550) and 20 parts of plasticizer DOZ were added, and the internal kneading was continued for 1.5 min. In the fourth step, the internal kneading was reversed for 20 s. After the internal kneading was completed, the rubber was cleaned for 1 min, and the rubber was discharged to obtain the mixed rubber.

[0106] The open mill was set to rotate at 22 rpm and the roller temperature was 38°C. The mixed rubber was added to the open mill to make it roll, with 1.6 parts of vulcanizer VULCAR, 2.3 parts of accelerator TBT, and 3 parts of accelerator DM. The left and right knives were cut 5 times, and the triangle package was made 6 times. Finally, the nitrile rubber was unrolled.

[0107] Example 5

[0108] The speed of the internal mixer was set to 30 rpm, and the initial temperature was set to 60°C. In the first step, 100 parts of raw rubber (JSRN260S) were internally kneaded in the internal mixer for 1 min. In the second step, 5 parts of zinc oxide (commercially available), 1.5 parts of stearic acid (commercially available), 1.5 parts of antioxidant, 1 part of antioxidant, 1 part of oleamide, and 3 parts of benzoic acid were added. In the third step, 120 parts of carbon black (Cabot N550) and 20 parts of plasticizer DOZ were added, and the internal kneading was continued for 1.5 min. In the fourth step, the internal kneading was reversed for 20 s. After the internal kneading was completed, the rubber was cleaned for 1 min, and the rubber was discharged to obtain the mixed rubber.

[0109] The open mill was set to rotate at 22 rpm and the roller temperature was 38°C. The mixed rubber was added to the open mill to make it roll, with 2.0 parts of vulcanizer VULCAR, 2.3 parts of accelerator TBT, and 3 parts of accelerator DM. The left and right knives were cut 5 times, and the triangle package was made 6 times. Finally, the nitrile rubber was unrolled.

[0110] Example 6

[0111] The speed of the internal mixer was set to 30 rpm, and the initial temperature was set to 60°C. In the first step, 100 parts of raw rubber (JSRN260S) were internally kneaded in the internal mixer for 1 min. In the second step, 5 parts of zinc oxide (commercially available), 1.5 parts of stearic acid (commercially available), 1.5 parts of antioxidant, 1 part of antioxidant, 1 part of oleamide, and 3 parts of benzoic acid were added. In the third step, 120 parts of carbon black (Cabot N550) and 20 parts of plasticizer DOZ were added, and the internal kneading was continued for 1.5 min. In the fourth step, the internal kneading was reversed for 20 s. After the internal kneading was completed, the rubber was cleaned for 1 min, and the rubber was discharged to obtain the mixed rubber.

[0112] The open mill was set to rotate at 22 rpm and the roller temperature was 38°C. The mixed rubber was added to the open mill to make it roll, with 2.2 parts of vulcanizer VULCAR, 2.3 parts of accelerator TBT, and 3 parts of accelerator DM. The left and right knives were cut 5 times, and the triangle package was made 6 times. Finally, the nitrile rubber was unrolled.

[0113] Physical properties of Example 1 and Example 4 to Example 6 were tested, and the test results are shown in Table 4.

[0114] Table 4 Physical property test results of Example 1, Example 4 to Example 6

[0115]

[0116] As shown in Table 4, the nitrile rubber made from the components in Example 1 has excellent physical properties and can meet the high and low temperature use environment of -50°C to 120°C, and is the most preferred embodiment of the present invention.

[0117] When the amount of the vulcanizing agent VULCAR added in Example 4 is 1.6 parts, the tensile strength, M100 and vulcanization speed of the prepared nitrile rubber will be slightly lower; when the amount of the vulcanizing agent VULCAR added in Example 6 is 2.2 parts, the performances are opposite, but all are within the target range.

[0118] The present invention adopts the vulcanizing agent VULCAR, which can increase the vulcanization speed and cross-linking density of the rubber, thereby increasing the strength of the rubber.

[0119] In summary, the present invention has a reasonable design and a simple preparation method. By adding an appropriate plasticizer DOZ, the nitrile rubber meets the low-temperature resistance performance while ensuring the hardness and tensile strength; by adding an appropriate vulcanizing agent VULCAR, the hardness and tensile strength of the nitrile rubber are further guaranteed; the high and low temperature resistant nitrile rubber for high-pressure oil cylinder rod seal of the present invention has excellent physical properties through reasonable proportioning of each component, and is suitable for the high and low temperature use environment of the high-pressure oil cylinder at -50°C to 120°C.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal, characterized by: The composition comprises the following components in parts by weight: Raw rubber: 100.0 parts, Carbon black: 110.0-150.0 parts, Zinc oxide: 5.0 parts, Stearic acid: 1.5 parts, Plasticizer DOZ: 18.0~22.0 parts, Anti-aging agent: 1.5 parts, Antioxidant: 1.0 parts, Oleic acid amide: 1.0 parts, Accelerator benzoic acid: 2.0-4.0 parts, Accelerator TBT: 2.0-2.5 parts, Accelerator DM: 2.0~4.0 parts, Vulcanizing agent VULCAR: 1.5-2.0 parts.

2. The high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal according to claim 1, characterized in that: The composition comprises the following components in parts by weight: Raw rubber: 100.0 parts, Carbon black: 120.0 parts, Zinc oxide: 5.0 parts, Stearic acid: 1.5 parts, Plasticizer DOZ: 20.0 parts, Anti-aging agent: 1.5 parts, Antioxidant: 1.0 parts, Oleic acid amide: 1.0 parts, Accelerator benzoic acid: 3.0 parts, Accelerator TBT: 2.3 parts, Accelerator DM: 3.0 parts, Curing agent VULCAR: 1.8 parts.

3. The high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal according to claim 1, characterized in that: The grade of the raw rubber is N260S.

4. The high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal according to claim 1, characterized in that: The grade of the carbon black is N550.

5. A method for preparing the high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal according to any one of claims 1 to 4, characterized in that: The specific steps include: Step S1, adding raw rubber into an internal mixer for a first internal mixing; Step S2, continue to add zinc oxide, stearic acid, antioxidant, antioxidant, oleic acid amide, and accelerator benzoic acid, and perform secondary mixing; Step S3, continue to add carbon black and plasticizer DOZ, and then knead for three times; Step S4, reversing the internal mixing, cleaning and removing the glue after the internal mixing is completed, so as to obtain a mixed rubber; Step S5, adding the mixed rubber into an open mill, adding a vulcanizing agent VULCAR, an accelerator TBT and an accelerator DM after the mixed rubber is rolled, and performing open milling to obtain a high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal.

6. The method for preparing the high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal according to claim 5, characterized in that: The mixer has a rotation speed of 30 rpm, an initial mixer temperature of 60° C., a first mixer time of 1 min, a second mixer time of 1.5 min, a third mixer time of 1.5 min, a reverse mixer time of 20 s, and a cleaning time of 1 min after the mixer is completed.

7. The method for preparing the high and low temperature resistant nitrile rubber for high pressure oil cylinder rod seal according to claim 5, characterized in that: The mill speed was set at 22 rpm and the roller temperature was set at 38°C.

8. A rod sealing ring, which is sleeved on a high-pressure oil cylinder piston rod, characterized in that: The annular body (1) comprises an annular body (1), the right end face of the annular body (1) is a plane end face, the left end face of the annular body (1) is provided with a U-shaped groove (2), the U-shaped groove (2) divides the left end face into an inner lip (3) and an outer lip (4), and the inner lip (3) is arranged close to the piston rod of the high-pressure oil cylinder; The rod sealing ring is made of high and low temperature resistant nitrile rubber for high pressure oil cylinder rod sealing as claimed in any one of claims 1 to 4.

9. The rod sealing ring according to claim 8, characterized in that: The height H2 of the inner lip (3) is smaller than the height H1 of the outer lip (4).

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