Ultrahigh and low temperature resistant hydrogenated butadiene-acrylonitrile rubber for plug, preparation method of hydrogenated butadiene-acrylonitrile rubber and plug

Abstract

The invention relates to the technical field of rubber sealing materials, and discloses ultrahigh and low temperature resistant hydrogenated butadiene-acrylonitrile rubber for a plug, a preparation method of the hydrogenated butadiene-acrylonitrile rubber and the plug. The hydrogenated butadiene-acrylonitrile rubber comprises the following components in parts by weight: 100 parts of HNBR raw rubber, 80-90 parts of carbon black, 10-20 parts of a vulcanizing agent DCP-40, 5 parts of zinc oxide, 1 part of stearic acid, 2 parts of microcrystalline wax, 8-12 parts of a plasticizer RS-107, 1 part of an anti-aging agent MBZ and 1 part of an anti-aging agent KY-405. The hydrogenated butadiene-acrylonitrile rubber is reasonable in design, the preparation method is simple, and the HNBR raw rubber (Zetpol 3310), the plasticizer RS-107, the vulcanizing agent DCP-40 and the carbon black (Cabot N550) are matched for use, so that the ultrahigh and low temperature resistant hydrogenated butadiene-acrylonitrile rubber for the plug has good hardness and tensile strength, and is suitable for working conditions such as low temperature resistance (-40 DEG C to 120 DEG C) and oil resistance; according to the hydrogenated butadiene-acrylonitrile rubber disclosed by the invention, all the components are reasonably proportioned, so that the rubber has excellent physical properties.

Description

Technical Field

[0001] The invention relates to the technical field of rubber sealing materials, in particular to ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs, a preparation method thereof, and the plug. Background Art

[0002] The solenoid valve is a basic automation component used to control fluids. The plug is installed in the inner cavity of the solenoid valve. The sealing performance of the plug is crucial to the solenoid valve.

[0003] The use of rubber plugs will be affected under ultra-high and low temperature working conditions (-40 to 120°C). The cold resistance of rubber plugs is related to the type of material and formula, so special attention should be paid to selecting rubber materials suitable for low-temperature environments. Generally speaking, the elasticity and softness of rubber will decrease in low-temperature environments, and the hardness will increase, resulting in a decrease in the performance of the rubber plug. In addition, in low-temperature environments, the sealing performance of rubber may be slightly reduced. Due to the hardening and possible shrinkage of the rubber material, the sealing effect of the plug may be less than expected. The following are factors to consider when designing the rubber material formula for low-temperature rubber plugs: rubber material, resilience and hardness, and working environment.

[0004] Ethylene propylene diene rubber (EPDM) is a commonly used low-temperature resistant rubber material, maintaining a certain degree of elasticity and softness in low-temperature environments. However, its oil and wear resistance limitations significantly limit its use in oily environments. Silicone rubber (MVQ) also offers excellent low-temperature resistance, but its service life in oily environments is also uncertain. Nitrile butadiene rubber (NBR) offers excellent oil and low-temperature resistance, but cannot guarantee long-term sealing performance at temperatures exceeding 120°C. Therefore, a material for manufacturing oil-resistant rubber plugs is urgently needed. This rubber material must be oil-resistant, resistant to ultra-high and low temperatures over a wide temperature range, and exhibit minimal compression set. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a hydrogenated nitrile rubber for a plug that is resistant to ultra-high and low temperatures, a preparation method thereof, and a plug. The hydrogenated nitrile rubber has low temperature resistance (-40 to 120°C) and oil resistance under working conditions, meeting the physical performance requirements of solenoid valves.

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

[0007] A hydrogenated nitrile rubber for plugs resistant to ultra-high and low temperatures, comprising the following components in parts by weight:

[0008] HNBR raw rubber: 100 parts,

[0009] Carbon black: 80-90 parts,

[0010] Curing agent DCP-40: 10-20 parts,

[0011] Zinc oxide: 5 parts,

[0012] Stearic acid: 1 part,

[0013] Microcrystalline wax: 2 parts,

[0014] Plasticizer RS-107: 8-12 parts,

[0015] Antioxidant MBZ: 1 part,

[0016] Antiaging agent KY-405: 1 part.

[0017] The material utilizes hydrogenated nitrile rubber (HNBR) as the base material, combined with antioxidants MBZ and KY-405 to ensure long-term wear resistance in oil environments. The synergistic effect of carbon black and vulcanizing agent DCP-40 ensures a tensile strength of ≥15MPa and a compression set of ≤15%.

[0018] Furthermore, the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugging comprises the following components in parts by weight:

[0019] HNBR raw rubber: 100 parts,

[0020] Carbon black: 85 parts,

[0021] Curing agent DCP-40: 15 parts,

[0022] Zinc oxide: 5 parts,

[0023] Stearic acid: 1 part,

[0024] Microcrystalline wax: 2 parts,

[0025] Plasticizer RS-107: 10 parts,

[0026] Antioxidant MBZ: 1 part,

[0027] Antiaging agent KY-405: 1 part.

[0028] Furthermore, the brand of the HNBR raw rubber is Zetpol 3310.

[0029] Furthermore, the carbon black is of grade N550. N550 carbon black has a specific particle size and structure, and can be well combined with hydrogenated nitrile rubber to improve the hardness, tensile strength and wear resistance of the rubber while maintaining good elasticity and sealing properties.

[0030] A method for preparing the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs as described above specifically comprises the following steps:

[0031] Step S1, adding HNBR raw rubber into an internal mixer and performing a first internal mixing;

[0032] Step S2, adding stearic acid, antioxidant MBZ, antioxidant KY-405, zinc oxide and microcrystalline wax, and performing secondary banburying;

[0033] Step S3, adding carbon black and plasticizer RS-107, and performing three banburying;

[0034] Step S4: reversing the mixing process, cleaning and removing the glue after the mixing is completed, thereby obtaining a mixed rubber;

[0035] Step S5: adding the rubber mix to an open mill, adding a vulcanizing agent DCP-40 after the rubber mix is ​​rolled, and performing open milling to obtain hydrogenated nitrile butadiene rubber for plugs that is resistant to ultrahigh and low temperatures.

[0036] Furthermore, the mixer speed was 30 rpm, the initial mixing temperature was 60°C, the first mixing time was 1 minute, the second mixing time was 1.5 minutes, the third mixing time was 2 minutes, the reverse mixing time was 20 seconds, and the cleaning time after mixing was 1 minute. By setting specific parameters such as the mixer speed, temperature, and time, the stability and controllability of the mixing process were ensured, resulting in a rubber compound with excellent performance.

[0037] Furthermore, in step S3, carbon black and plasticizer RS-107 are added to the internal mixer in two batches. Adding carbon black and plasticizer in two batches helps to evenly disperse them in the rubber, avoids the problem of local concentration being too high or too low, and thus improves the performance and stability of the rubber.

[0038] Furthermore, in step S5, the mill speed is 22 rpm and the roller temperature is 38° C. By setting the specific mill speed and roller temperature, good fluidity and roller adhesion of the rubber mix during the milling process are ensured, thereby obtaining hydrogenated nitrile rubber with a smooth surface and uniform properties.

[0039] The beneficial effects of the present invention are as follows: the present invention has a reasonable design and a simple preparation method; by using HNBR raw rubber (Zetpol 3310), plasticizer RS-107, vulcanizer DCP-40 and carbon black (Cabot N550) in combination, it is further ensured that the hydrogenated nitrile rubber for plugs resistant to ultra-high and low temperatures has good hardness and tensile strength, and is suitable for working conditions such as low temperature resistance (-40° C. to 120° C.) and oil resistance; and the hydrogenated nitrile rubber of the present invention has excellent physical properties by rationally proportioning the various components. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 It is a schematic diagram of the cross-sectional structure of the plug of Example 1. DETAILED DESCRIPTION

[0042] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0043] 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 also includes the plural. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] A hydrogenated nitrile rubber for plugs resistant to ultra-high and low temperatures, comprising the following components in parts by weight:

[0046] HNBR raw rubber: 100 parts,

[0047] Carbon black: 80-90 parts,

[0048] Curing agent DCP-40: 10-20 parts,

[0049] Zinc oxide: 5 parts,

[0050] Stearic acid: 1 part,

[0051] Microcrystalline wax: 2 parts,

[0052] Plasticizer RS-107: 8-12 parts,

[0053] Antioxidant MBZ: 1 part,

[0054] Antiaging agent KY-405: 1 part.

[0055] The brand of HNBR raw rubber is Zetpol 3310 (manufacturer: Zetpol), and the brand of carbon black is N550 (manufacturer: Cabot).

[0056] The present invention also discloses a preparation method for preparing the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs, which specifically comprises the following steps:

[0057] Step S1, adding HNBR raw rubber into an internal mixer and performing a first internal mixing;

[0058] Step S2, adding stearic acid, antioxidant MBZ, antioxidant KY-405, zinc oxide and microcrystalline wax, and performing secondary banburying;

[0059] Step S3, adding carbon black and plasticizer RS-107, and performing three banburying;

[0060] Step S4, reversing the mixing, cleaning and removing the glue after the mixing is completed, thereby obtaining a mixed rubber;

[0061] Step S5: adding the rubber mix to an open mill, adding a vulcanizing agent DCP-40 after the rubber mix is ​​rolled, and performing open milling to obtain hydrogenated nitrile butadiene rubber for plugs that is resistant to ultrahigh and low temperatures.

[0062] The speed of the internal mixer is 30 rpm, the initial internal mixing temperature is 60°C, the time for the first internal mixing is 1 min, the time for the second internal mixing is 1.5 min, the time for the third internal mixing is 2 min, the reverse internal mixing time is 20 s, and the cleaning time after the internal mixing is 1 min.

[0063] In step S3, carbon black and plasticizer RS-107 are added to the internal mixer in two batches.

[0064] In step S5, the speed of the mixing mill is 22 rpm and the roller temperature is 38°C.

[0065] Example 1

[0066] 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 HNBR raw rubber (Zetpol 3310) were internally kneaded in the internal mixer for 1 minute. In the second step, 1 part of stearic acid (commercially available), 1 part of antioxidant 1 (commercially available), 1 part of antioxidant 2 (commercially available), and 1 part of microcrystalline wax (commercially available) were added. In the third step, 85 parts of carbon black (Cabot N550) and 10 parts of plasticizer RS-107 (commercially available) were added in two batches. The internal kneading was continued for 2 minutes. In the fourth step, the internal kneading was reversed for 20 seconds. After the internal kneading was completed, the mixture was cleaned for 1 minute and the rubber was discharged to obtain the mixed rubber.

[0067] The open mill was set at a speed of 22 rpm and a roller temperature of 38°C. The mixed rubber was added to the open mill and rolled around the rollers. 15 parts of a vulcanizing agent, DCP-40 (commercially available), was added. The mixture was cut 5 times left and right, and triangularly wrapped 6 times. Finally, the mixture was vented and rolled to obtain a hydrogenated nitrile rubber sheet.

[0068] like Figure 1 As shown, this embodiment also discloses a plug made of the above hydrogenated nitrile rubber. The plug is installed in the inner cavity of the solenoid valve.

[0069] Comparative Example 1

[0070] The difference between Comparative Example 1 and Example 1 is that "HNBR raw rubber (Zetpol 3310)" is replaced by "HNBR raw rubber (Zetpol 2020)", and the amount of HNBR raw rubber added is still 100 parts.

[0071] The rubbers prepared in Example 1 and Comparative Example 1 were subjected to physical property tests, and the test results are shown in Table 1.

[0072] Table 1 Physical property test results of Example 1 and Comparative Example 2

[0073]

[0074]

[0075] As shown in Table 1, the hydrogenated nitrile rubber prepared in Example 1 has excellent physical properties and can meet the high and low temperature operating conditions of -40°C to 120°C, making it the most preferred embodiment of the present invention.

[0076] The low-temperature properties of Comparative Example 1 (TR10 is -34.7°C) do not meet the requirements. Zetpol 2020 has a high ACN content. When the ACN content increases, the interaction force between the rubber molecular chains increases and the flexibility of the molecular chains decreases, which makes it more difficult for the molecular chains to move at low temperatures, thereby increasing the Tg of the raw rubber and decreasing the low-temperature resistance.

[0077] In addition, the AN and hydrogenation rate of HNBR raw rubber (ZP3310) and HNBR raw rubber (ZP2020) are shown in Table 2.

[0078] Table 2 Properties of HNBR raw rubber (ZP3310) and HNBR raw rubber (ZP2020)

[0079] HNBR grades Zetpol 3310 Zetpol 2020 ACN / % 25 36 Hydrogenation rate / ℃ 95 91

[0080] It can be seen from Table 1 and Table 2 that the hydrogenated nitrile rubber prepared in Example 1 has excellent physical properties and can meet the high and low temperature use environment of -40°C to 120°C, and is the most preferred embodiment of the present invention.

[0081] Comparative Example 2

[0082] The difference between Comparative Example 2 and Example 1 is that "plasticizer RS-107" is replaced by "plasticizer DOP", and the amount of plasticizer added is still 10 parts.

[0083] Comparative Example 3

[0084] The difference between Comparative Example 3 and Example 1 is that "plasticizer RS-107" is replaced by "plasticizer TOTM", and the amount of plasticizer added is still 10 parts.

[0085] The rubbers prepared in Example 1, Comparative Example 2 and Comparative Example 3 were tested for physical properties. The test results are shown in Table 3.

[0086] Table 3 Physical property test results of Example 1, Comparative Example 2 and Comparative Example 3

[0087] As shown in Table 3, the hydrogenated nitrile rubber prepared in Example 1 has excellent physical properties and can meet the high and low temperature operating conditions of -40°C to 120°C, making it the most preferred embodiment of the present invention.

[0088] Comparative Example 2 uses a common aromatic plasticizer, dioctyl phthalate (DOP). Due to the molecular chain structure of the plasticizer itself, it has a significant hindering effect on the orientation and rearrangement of the rubber molecular chains at low temperatures, resulting in a higher TR10 of HNBR, which does not meet the actual working conditions.

[0089] Comparative Example 3 uses trioctyl trimellitate (TOTM) as a plasticizer, and the rubber has better oil and high temperature resistance. Comparative Examples 2 and 3 have better effects on the oil and high temperature resistance of the rubber, but their low temperature resistance is far inferior to that of the aliphatic plasticizer RS-107 (Example 1).

[0090] Example 2

[0091] 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 HNBR raw rubber (Zetpol 3310) were internally kneaded in the internal mixer for 1 minute. In the second step, 1 part of stearic acid (commercially available), 1 part of antioxidant 1 (commercially available), 1 part of antioxidant 2 (commercially available), and 1 part of microcrystalline wax (commercially available) were added. In the third step, 85 parts of carbon black (Cabot N550) and 10 parts of plasticizer RS-107 (commercially available) were added in two batches. The internal kneading was continued for 2 minutes. In the fourth step, the internal kneading was reversed for 20 seconds. After the internal kneading was completed, the mixture was cleaned for 1 minute and the rubber was discharged to obtain the mixed rubber.

[0092] The open mill was set to a speed of 22 rpm and a roller temperature of 38°C. The mixed rubber was added to the open mill and rolled around the rollers. 10 parts of a vulcanizing agent, DCP-40 (commercially available), was added. The mixture was cut 5 times left and right, and triangularly wrapped 6 times. Finally, the mixture was vented and rolled to obtain a hydrogenated nitrile rubber sheet.

[0093] Example 3

[0094] 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 HNBR raw rubber (Zetpol 3310) were internally kneaded in the internal mixer for 1 minute. In the second step, 1 part of stearic acid (commercially available), 1 part of antioxidant 1 (commercially available), 1 part of antioxidant 2 (commercially available), and 1 part of microcrystalline wax (commercially available) were added. In the third step, 85 parts of carbon black (Cabot N550) and 10 parts of plasticizer RS-107 (commercially available) were added in two batches. The internal kneading was continued for 2 minutes. In the fourth step, the internal kneading was reversed for 20 seconds. After the internal kneading was completed, the mixture was cleaned for 1 minute and the rubber was discharged to obtain the mixed rubber.

[0095] The open mill was set to a speed of 22 rpm and a roller temperature of 38°C. The mixed rubber was added to the open mill and rolled around the rollers. 20 parts of a vulcanizing agent, DCP-40 (commercially available), was added. The mixture was cut 5 times left and right, and triangularly rolled 6 times. Finally, the mixture was vented and rolled to obtain a hydrogenated nitrile rubber sheet.

[0096] The physical properties of the rubbers prepared in Example 1, Example 2 and Example 3 were tested. The test results are shown in Table 4.

[0097] Table 4 Physical property test results of Example 1, Example 2 and Example 3

[0098]

[0099]

[0100] As shown in Table 4, the hydrogenated nitrile rubber prepared in Example 1 has excellent physical properties and can meet the high and low temperature operating conditions of -40°C to 120°C, making it the most preferred embodiment of the present invention.

[0101] Compared with Example 1, Example 2 and Example 3, only the weight of the vulcanizing agent DCP-40 added was changed.

[0102] In embodiment 2, when the vulcanizing agent DCP-40 add-on is 10 parts, the vulcanization degree of HNBR is lower, and cross-linked structure is imperfect, and hardness and tensile modulus are all lower, and compression set is larger. In embodiment 3, when the vulcanizing agent DCP-40 add-on is 20 parts, HNBR is excessively cross-linked, and hardness and tensile modulus increase, but the mobility of molecular segment descends, and the arrangement orientation ability under stress reduces, and shows as elongation at break and the TR10 under low temperature all relatively poor. Therefore, the vulcanizing agent DCP-40 optimum add-on is 15 parts of (embodiment 1).

[0103] Example 4

[0104] 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 HNBR raw rubber (Zetpol 3310) were internally kneaded in the internal mixer for 1 minute. In the second step, 1 part of stearic acid (commercially available), 1 part of antioxidant 1 (commercially available), 1 part of antioxidant 2 (commercially available), and 1 part of microcrystalline wax (commercially available) were added. In the third step, 80 parts of carbon black (Cabot N550) and 10 parts of plasticizer RS-107 (commercially available) were added in two batches. The internal kneading was continued for 2 minutes. In the fourth step, the internal kneading was reversed for 20 seconds. After the internal kneading was completed, the mixture was cleaned for 1 minute and the rubber was discharged to obtain the mixed rubber.

[0105] The open mill was set at a speed of 22 rpm and a roller temperature of 38°C. The mixed rubber was added to the open mill and rolled around the rollers. 15 parts of a vulcanizing agent, DCP-40 (commercially available), was added. The mixture was cut 5 times left and right, and triangularly wrapped 6 times. Finally, the mixture was vented and rolled to obtain a hydrogenated nitrile rubber sheet.

[0106] Example 5

[0107] 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 HNBR raw rubber (Zetpol 3310) were internally kneaded in the internal mixer for 1 minute. In the second step, 1 part of stearic acid (commercially available), 1 part of antioxidant 1 (commercially available), 1 part of antioxidant 2 (commercially available), and 1 part of microcrystalline wax (commercially available) were added. In the third step, 90 parts of carbon black (Cabot N550) and 10 parts of plasticizer RS-107 (commercially available) were added in two batches. The internal kneading was continued for 2 minutes. In the fourth step, the internal kneading was reversed for 20 seconds. After the internal kneading was completed, the mixture was cleaned for 1 minute and the rubber was discharged to obtain the mixed rubber.

[0108] The open mill was set at a speed of 22 rpm and a roller temperature of 38°C. The mixed rubber was added to the open mill and rolled around the rollers. 15 parts of a vulcanizing agent, DCP-40 (commercially available), was added. The mixture was cut 5 times left and right, and triangularly wrapped 6 times. Finally, the mixture was vented and rolled to obtain a hydrogenated nitrile rubber sheet.

[0109] The physical properties of the rubbers prepared in Example 1, Example 4 and Example 5 were tested. The test results are shown in Table 5.

[0110] Table 5 Physical property test results of Example 1, Example 4 and Example 5

[0111]

[0112]

[0113] As shown in Table 5, the hydrogenated nitrile rubber prepared in Example 1 has excellent physical properties and can meet the high and low temperature operating conditions of -40°C to 120°C, making it the most preferred embodiment of the present invention.

[0114] Compared with Example 1, Example 4 and Example 5, only the weight of carbon black (Cabot N550) added was changed.

[0115] In Example 4, when the carbon black addition amount was 80 parts, the corresponding elongation at break increased slightly, while the tensile strength and hardness decreased slightly. In Example 5, when the carbon black addition amount was 90 parts, the performance was the opposite, but both were within the target range. This is because as the carbon black dosage increases, it can produce stronger interactions with the rubber molecules, forming effective physical crosslinking points and enhancing the load-bearing capacity of the rubber matrix. However, the interaction between carbon black and rubber molecules also restricts the movement of the molecular chains, thereby reducing their chain flexibility. Therefore, the optimal addition amount of carbon black is 85 parts (Example 1).

[0116] In summary, the present invention has a reasonable design and a simple preparation method. By using HNBR raw rubber (Zetpol3310), plasticizer RS-107, vulcanizer DCP-40 and carbon black (Cabot N550) in combination, it is further ensured that the hydrogenated nitrile rubber for plugs with ultra-high and low temperature resistance has good hardness and tensile strength, and is suitable for working conditions such as low temperature resistance (-40°C to 120°C) and oil resistance. The hydrogenated nitrile rubber of the present invention has excellent physical properties by rationally proportioning the various components.

[0117] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above 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 hydrogenated nitrile rubber for plugging that is resistant to ultra-high and low temperatures, characterized by: The composition comprises the following components in parts by weight: HNBR raw rubber: 100 parts, Carbon black: 80-90 parts, Curing agent DCP-40: 10-20 parts, Zinc oxide: 5 parts, Stearic acid: 1 part, Microcrystalline wax: 2 parts, Plasticizer RS-107: 8-12 parts, Antioxidant MBZ: 1 part, Antiaging agent KY-405: 1 part.

2. The ultra-high and low temperature resistant hydrogenated nitrile rubber for plugging according to claim 1, characterized in that: The composition comprises the following components in parts by weight: HNBR raw rubber: 100 parts, Carbon black: 85 parts, Curing agent DCP-40: 15 parts, Zinc oxide: 5 parts, Stearic acid: 1 part, Microcrystalline wax: 2 parts, Plasticizer RS-107: 10 parts, Antioxidant MBZ: 1 part, Antiaging agent KY-405: 1 part.

3. The ultra-high and low temperature resistant hydrogenated nitrile rubber for plugging according to claim 1, characterized in that: The brand of the HNBR raw rubber is Zetpol 3310.

4. The ultra-high and low temperature resistant hydrogenated nitrile rubber for plugging according to claim 1, characterized in that: The grade of the carbon black is N550.

5. A method for preparing the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs according to any one of claims 1 to 4, characterized in that: The specific steps include: Step S1, adding HNBR raw rubber into an internal mixer and performing a first internal mixing; Step S2, adding stearic acid, antioxidant MBZ, antioxidant KY-405, zinc oxide and microcrystalline wax, and performing secondary banburying; Step S3, adding carbon black and plasticizer RS-107, and performing three banburying; Step S4, reversing the mixing, cleaning and removing the glue after the mixing is completed, thereby obtaining a mixed rubber; Step S5: adding the rubber mix to an open mill, adding a vulcanizing agent DCP-40 after the rubber mix is ​​rolled, and performing open milling to obtain hydrogenated nitrile butadiene rubber for plugs that is resistant to ultrahigh and low temperatures.

6. The method for preparing the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs according to claim 5, characterized in that: The mixer speed is 30 rpm, the initial mixing temperature is 60° C., the first mixing time is 1 min, the second mixing time is 1.5 min, the third mixing time is 2 min, the reverse mixing time is 20 s, and the cleaning time after mixing is 1 min.

7. The method for preparing the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs according to claim 5, characterized in that: In step S3, carbon black and plasticizer RS-107 are added into the internal mixer in two batches.

8. The method for preparing the ultra-high and low temperature resistant hydrogenated nitrile rubber for plugs according to claim 5, characterized in that: In step S5, the speed of the mixing mill is 22 rpm and the roller temperature is 38°C.

9. A plug, which is provided in the inner cavity of a solenoid valve, characterized in that: The plug is made of hydrogenated nitrile rubber for plugs resistant to ultra-high and low temperatures as claimed in any one of claims 1 to 4.

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