CN111004420A - Low-temperature-resistant salt-fog-resistant rubber sealing material and preparation method thereof - Google Patents
Low-temperature-resistant salt-fog-resistant rubber sealing material and preparation method thereof Download PDFInfo
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- C08K5/00—Use of organic ingredients
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- C08K5/00—Use of organic ingredients
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- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
Abstract
The invention discloses a low-temperature-resistant and salt-fog-resistant rubber sealing material and a preparation method thereof, belonging to the technical field of rubber sealing materials, wherein the sealing material comprises the following components in parts by mass: 100 parts of rubber matrix, 3-5 parts of zinc oxide, 0.5-3 parts of stearic acid, 10-40 parts of montmorillonite, 5-50 parts of carbon black, 0.5-3 parts of anti-aging agent, 5-20 parts of plasticizer, 1.5-3 parts of accelerator and 0-10 parts of vulcanizing agent and auxiliary agent thereof. The rubber sealing material is prepared from the raw materials through an open mill plastication process, an internal mixer mixing process, an open mill mixing process and a vulcanization process, has low temperature resistance and salt mist resistance, and can meet the requirements of deck mechanical sealing on polar ships and oil-resistant sealing of low-temperature pipeline systems.
Description
Technical Field
The invention relates to the technical field of rubber sealing materials, in particular to a low-temperature-resistant and salt-fog-resistant rubber sealing material and a preparation method thereof.
Background
With the development of machinery and other industries, the amount and variety of rubber sealing products are increasing. Nowadays, the trace of rubber sealing products is seen in many fields such as machinery, ships, buildings, automobiles, aerospace and the like, and the application range thereof is self-evident. As a basic component of a mechanical device, once a problem occurs, it affects the operation of the entire device. The rubber sealing material mainly utilizes the characteristics of elasticity, permeability resistance, corrosion resistance, aging resistance and the like of rubber to achieve the purpose of sealing. Whether the rubber sealing material can achieve the sealing function depends on two aspects: the first is structural design and the second is material improvement.
The support of the polar ships is urgently needed for activities such as polar exploration, polar shipping, polar resource development and the like. The polar climate environment is extremely severe, and the low temperature is too much ice for years. The time is long in winter in the arctic region, the temperature is between-43 ℃ and-26 ℃, and the average temperature is-34 ℃; the sea air exchange is strong, the humidity is very large, the relative humidity is more than 95% in most of time, and the sea air is represented as fog and dense fog. The special environment of the polar region makes the use condition of the polar ship much worse than that of the conventional ship, and various rubber sealing materials used on the polar ship are easy to have obvious elasticity reduction and even loss under the extremely low temperature environment and the high salt fog environment, so that the problems of equipment sealing failure, oil leakage and the like are caused.
The low temperature resistance of rubber refers to the ability to maintain various mechanical properties at a certain low temperature, which is mainly determined by glass transition and crystallization. The glass transition is a process of freezing a high molecular chain segment, the glass transition temperature (Tg) is mainly influenced by the flexibility, substituent and configuration of a molecular chain, and the higher the polarity of the molecular chain is, the poorer the flexibility of the molecular chain is, and the poorer the low-temperature resistance is. When rubber is soaked in oil, small molecular oil can permeate into a cross-linked network of the rubber to swell the rubber, so that the mechanical property of the rubber is reduced, and the sealing property of the rubber is directly influenced. Generally, oils such as hydraulic oil and lubricating oil have weak molecular polarity, and according to the principle of similar compatibility, rubber with larger polarity has better tolerance to the oil. Therefore, oil resistance and low temperature resistance are contradictory, and the extremely low temperature and high salt mist environment of the polar ships puts higher demands on rubber sealing materials, and solution is needed.
Chinese patent 201710631425.6 discloses an environment-friendly high and low temperature resistant rubber oil seal material and a preparation method thereof, which adopts nitrile rubber as a matrix, and is prepared by mixing with carbon nanofiber powder, a heat-resistant additive, an environment-friendly silane coupling agent, a plasticizer and the like, and then vulcanizing together with a metal framework. The patent relates to 53CA, and solves the problem of environmental protection by selecting an environment-friendly coupling agent and an environment-friendly adhesive, and solves the problem of high temperature resistance by adding a heat-resistant additive, but does not relate to the salt spray resistance required by the use in polar marine environment.
Chinese patent 2000710129750.9 entitled "oil-resistant and low-temperature-resistant rubber composition" describes an oil-resistant and low-temperature-resistant rubber composition for wire and cable sheaths, fuel hoses and automobile molded parts, which is prepared by using nitrile rubber and polyvinyl chloride together and adding carbon black, an active agent, a vulcanizing agent, an anti-aging agent, an anti-scorching agent, a promoter and a plasticizer for vulcanization, wherein the plasticizer is sebacate and adipate. The patent improves the low-temperature performance of the rubber composition by adding sebacate and adipate as plasticizers, is used for preparing oil-resistant and ozone-resistant products in the automobile industry, and does not relate to the salt spray resistance required by the use in polar marine environments.
Therefore, the search for a low temperature resistant and salt fog resistant rubber sealing material is a major problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a low-temperature-resistant and salt-fog-resistant rubber sealing material and a preparation method thereof, wherein the low-temperature-resistant and salt-fog-resistant rubber sealing material has low-temperature resistance and salt-fog resistance, and can meet the requirements of deck mechanical sealing on polar ships and oil-resistant sealing of low-temperature pipeline systems.
In order to achieve the purpose, the invention adopts the specific scheme that: the low-temperature-resistant and salt-fog-resistant rubber sealing material comprises the following components in parts by mass: 100 parts of rubber matrix, 3-5 parts of zinc oxide, 0.5-3 parts of stearic acid, 10-40 parts of montmorillonite, 5-50 parts of carbon black, 0.5-3 parts of anti-aging agent, 5-20 parts of plasticizer and 1-3 parts of accelerator.
The rubber matrix is at least one of nitrile rubber and hydrogenated nitrile rubber.
The montmorillonite is organically modified montmorillonite, the particle size is 16-20 mu m, and the interlayer spacing is 2.4-2.6 nm.
The carbon black is at least one of medium super wear-resistant carbon black N220, high wear-resistant carbon black N330 and fast extrusion carbon black N550.
The anti-aging agent is at least one of an anti-aging agent ODA, an anti-aging agent 4010NA, an anti-aging agent 445, an anti-aging agent MB and an anti-aging agent RD;
the plasticizer is at least one of plasticizer TP-95, plasticizer TP-90B, plasticizer TOTM and plasticizer DOS;
the accelerator is at least one of an accelerator TMTD and an accelerator DM.
The rubber sealing material also comprises 0-2 parts by mass of sulfur and/or 0-5 parts by mass of peroxide vulcanizing agent and 0-5 parts by mass of vulcanizing assistant;
the peroxide vulcanizing agent is at least one of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane and dicumyl peroxide;
the vulcanizing assistant is at least one of triallyl isocyanurate and zinc methacrylate.
Preferably, the rubber sealing material comprises the following components: 100 parts of hydrogenated nitrile rubber, 5 parts of zinc oxide, 3 parts of stearic acid, 10 parts of montmorillonite, 5 parts of carbon black, 3 parts of anti-aging agent, 20 parts of plasticizer, 1.1 parts of accelerator, 5 parts of peroxide vulcanizing agent and 5 parts of vulcanizing aid.
A preparation method of a low-temperature-resistant and salt-fog-resistant rubber sealing material comprises the following steps:
step one, plasticating by an open mill: weighing the components according to the required proportion, and fully plasticating the rubber matrix on a double-roller open mill for later use;
step two, mixing by an internal mixer: putting the plasticated rubber substrate obtained in the step one, zinc oxide, stearic acid and an anti-aging agent into an internal mixer for primary internal mixing at the temperature of not higher than 80 ℃, adding a plasticizer, 50% of montmorillonite and 50% of carbon black into the internal mixer for secondary internal mixing at the temperature of not higher than 90 ℃, and finally adding the remaining 50% of montmorillonite and the remaining 50% of carbon black into the internal mixer for tertiary internal mixing at the temperature of not higher than 90 ℃ to obtain an agglomerated rubber material;
step three, mixing by an open mill: fully cooling the agglomerated rubber material obtained in the step two, adding the agglomerated rubber material into an open mill, and then sequentially adding an accelerator, a vulcanizing agent and an auxiliary agent thereof for mixing until the surface of the rubber material is smooth and has no obvious bubbles, so as to obtain rubber compound;
step four, vulcanization: and (3) placing the rubber compound obtained in the step three in a metal mold, heating, pressurizing and vulcanizing to obtain a product, and heating the product cooled to room temperature to 150 ℃ to obtain the low-temperature-resistant rubber sealing material.
Further, in the second step, the time for primary banburying is 2min, and the time for secondary banburying and the time for third banburying are both 3 min.
Further, in the fourth step, the rubber compound is placed in a metal mold for heating and pressure vulcanization under the conditions that the temperature is 145-155 ℃ and the pressure is 6-10 MPa, and the molding time is 35-45 min, so as to obtain a product; taking out the product, cooling to room temperature, placing the product cooled to room temperature in an oven, heating to 90 ℃, preserving heat for 0.5h, heating to 120 ℃, preserving heat for 0.5h, and finally heating to 150 ℃, preserving heat for 1-3 h to obtain the rubber sealing material.
The rubber matrix is at least one of nitrile rubber and hydrogenated nitrile rubber, and the acrylonitrile content in the nitrile rubber or the hydrogenated nitrile rubber is 17-26%, so that the nitrile rubber or the hydrogenated nitrile rubber belongs to rubber with low acrylonitrile content.
The anti-aging agent can prevent and slow the oxidation process, and prolong the service life of the rubber.
The plasticizer is used for reducing the glass transition temperature of the rubber, the plasticity and the fluidity of the rubber are good, the calendering and extrusion molding operations are convenient, and meanwhile, the hardness and the stress at definite elongation of the rubber can be reduced, and the elasticity is improved.
The accelerator shortens the vulcanization time, reduces the consumption of vulcanizing agents and improves the mechanical property of rubber.
The peroxide vulcanizing agent and the vulcanizing assistant are matched to form a good crosslinking system, so that the rubber can form a three-dimensional network structure more easily, the mechanical property of the blended rubber is improved, and the vulcanizing time is shortened.
Has the advantages that:
1. the rubber sealing material has low temperature resistance and salt spray resistance, one of the rubber substrates is nitrile rubber which is the most commonly used oil-resistant sealing material, the hydrogenated nitrile rubber is a highly saturated elastomer obtained by performing special hydrogenation treatment on the nitrile rubber, the weather resistance is greatly improved compared with the nitrile rubber due to the highly saturated molecular structure of the hydrogenated nitrile rubber, and the hydrogenated nitrile rubber has the performance characteristics of oil resistance, weather resistance and the like of the nitrile rubber The molecular chain segment is easier to move, so that the low temperature resistance of the rubber sealing material is improved.
2. The rubber sealing material with better low-temperature resistance can be obtained by matching the hydrogenated nitrile rubber (or the hydrogenated nitrile rubber and the nitrile rubber) with a peroxide vulcanizing agent and a vulcanizing assistant and by synchronous vulcanization matching design of the materials. By adding the organic modified montmorillonite and the plasticizer with both polar and nonpolar groups, the compatibility of the plasticizer and a polar polymer rubber matrix is improved, and by adding a secondary vulcanization process, the crosslinking state of rubber can be improved, and the material with oil resistance, low temperature resistance and salt spray resistance can be obtained.
3. The rubber sealing material has excellent low temperature resistance (the brittleness temperature is below minus 45 ℃), the compression cold resistance coefficient is more than or equal to 0.25 at low temperature (below minus 45 ℃), the performances such as salt mist resistance required by polar marine environment are met, simultaneously, the oil resistance is also considered, and the requirements of deck mechanical sealing on polar ships and oil-resistant sealing of low-temperature pipeline systems can be met.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
In the following examples, various starting materials were used, and unless otherwise specified, conventional commercially available products were used. The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
The components of the low-temperature-resistant salt-fog-resistant rubber sealing material are shown in Table 1.
TABLE 1 composition in parts by mass of rubber sealing Material of example 1
The preparation method of the rubber sealing material comprises an open mill plastication process, an internal mixer mixing process, an open mill mixing process and a vulcanization process, and specifically comprises the following steps:
step one, plasticating by an open mill: weighing the components according to the proportion, fully plasticating the rubber matrix (hydrogenated nitrile rubber) on a double-roller open mill, opening cooling water, beating the roller distance to be minimum, thinly passing for 6-8 times, adjusting the roller distance to be large, and then beating 6-8 triangular bags.
Step two, mixing by an internal mixer: (1) putting the plasticated hydrogenated nitrile rubber, zinc oxide, stearic acid and an anti-aging agent into an internal mixer for primary internal mixing, controlling the speed of a rotor to be 20-40 r/m, and carrying out internal mixing for 2 minutes at the temperature of below 80 ℃;
(2) adding a plasticizer (plasticizer TP-95), 50% of organic modified montmorillonite and 50% of fast extrusion carbon black N550 into an internal mixer for secondary internal mixing, controlling the speed of a rotor to be 20-40 r/m, and carrying out internal mixing for 3 minutes at the temperature below 90 ℃;
(3) adding the rest 50% of organic modified montmorillonite and the rest 50% of fast extrusion carbon black N550 into an internal mixer for three times of internal mixing, controlling the speed of a rotor to be 20-40 r/m, carrying out internal mixing for 3 minutes, and controlling the temperature to be below 90 ℃ to obtain the agglomerated rubber material.
Step three, mixing by an open mill: and (3) fully cooling the agglomerated rubber material obtained in the step two, adding the agglomerated rubber material into an open mill, opening cooling water, sequentially adding an accelerator (a TMTD accelerator and a DM accelerator) and sulfur into the open mill, after the material is stirred and fed, adjusting the roller spacing, packaging for 4-5 times in a triangular bag again, and discharging the sheet after the surface of the rubber material is flat and no obvious bubbles exist, so that the mixing process is completed.
Step four, placing the rubber compound obtained in the step three in a metal mold at the temperature of 155 ℃ and the pressure of 8MPa for heating, pressurizing and vulcanizing, wherein the molding time is 45min, and obtaining a product; and heating the product cooled to room temperature to 90 ℃ for 0.5h, heating to 120 ℃ for 0.5h, and heating to 150 ℃ for 2h to obtain the low-temperature-resistant salt-fog-resistant rubber sealing material.
Example 2
The components of the low-temperature-resistant salt-fog-resistant rubber sealing material are shown in Table 2.
Table 2 composition in parts by mass of rubber sealing material of example 2
The preparation method of the rubber sealing material comprises the following steps:
step one, plasticating by an open mill: weighing the components according to the proportion, fully plasticating the rubber matrix (nitrile rubber and hydrogenated nitrile rubber) on a double-roller open mill, opening cooling water, beating the roller distance to be minimum, thinly passing for 6-8 times, adjusting the roller distance to be large, and then beating 6-8 triangular bags.
Step two, mixing by an internal mixer: (1) putting the plasticated rubber substrate, zinc oxide, stearic acid and an anti-aging agent (anti-aging agent 445 and anti-aging agent 4010NA) into an internal mixer for primary internal mixing, controlling the speed of a rotor to be 20-40 r/min, and carrying out internal mixing for 2 minutes at the temperature of below 80 ℃;
(2) adding a plasticizer (a plasticizer TP-95, a plasticizer TP-90B and a plasticizer TOTM), 50% of organic modified montmorillonite and 50% of medium and super wear-resistant carbon black N220 into an internal mixer for secondary internal mixing, controlling the speed of a rotor to be 20-40 r/m, and internal mixing for 3 minutes, wherein the temperature is controlled below 90 ℃;
(3) adding the rest 50% of the organic modified montmorillonite and the rest 50% of the medium and super wear-resistant carbon black N220 into an internal mixer for three times of internal mixing, controlling the speed of a rotor to be 20-40 r/m, carrying out internal mixing for 3 minutes, and controlling the temperature to be below 90 ℃ to obtain the agglomerated rubber material.
Step three, mixing by an open mill: and (3) fully cooling the agglomerated rubber material obtained in the step two, adding the agglomerated rubber material into an open mill, opening cooling water, sequentially adding an accelerator (an accelerator TMTD, an accelerator DM), sulfur, a peroxide vulcanizing agent (dicumyl peroxide, 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane) and a vulcanizing aid (triallyl isocyanurate ) into the open mill, after the material is stirred and consumed, adjusting the roll distance, and performing triangular wrapping for 4-5 times until the surface of the rubber material is flat and has no obvious bubbles, and discharging the rubber material to finish the mixing process.
Step four, placing the mixed rubber obtained in the step three in a metal mold at the temperature of 145 ℃ and the pressure of 10MPa for heating, pressurizing and vulcanizing, wherein the molding time is 35min, and obtaining a product; and heating the product cooled to room temperature to 90 ℃ for 0.5h, heating to 120 ℃ for 0.5h, and heating to 150 ℃ for 1h to obtain the low-temperature-resistant salt-fog-resistant rubber sealing material.
Example 3
The low temperature resistant and salt fog resistant rubber sealing material has the components shown in Table 3.
TABLE 3 composition in parts by mass of rubber sealing Material of example 3
The preparation method of the rubber sealing material comprises the following steps:
step one, plasticating by an open mill: weighing the components according to the proportion, fully plasticating the rubber matrix (hydrogenated nitrile rubber) on a double-roller open mill, opening cooling water, beating the roller distance to be minimum, thinly passing for 6-8 times, adjusting the roller distance to be large, and then beating 6-8 triangular bags.
Step two, mixing by an internal mixer: (1) putting the plasticated hydrogenated nitrile rubber, zinc oxide, stearic acid and an anti-aging agent (anti-aging agent 4010NA and anti-aging agent ODA) into an internal mixer for primary internal mixing, controlling the speed of a rotor to be 20-40 r/min, and carrying out internal mixing for 2 minutes at the temperature of below 80 ℃;
(2) adding a plasticizer (plasticizer TOTM and plasticizer DOS), 50% of organic modified montmorillonite and 50% of high-wear-resistance carbon black N330 into an internal mixer for secondary internal mixing, controlling the speed of a rotor to be 20-40 r/m, and carrying out internal mixing for 3 minutes, wherein the temperature is controlled below 90 ℃;
(3) adding the rest 50% of the organic modified montmorillonite and the rest 50% of the high-wear-resistance carbon black N330 into an internal mixer for three times of internal mixing, controlling the speed of a rotor to be 20-40 r/m, carrying out internal mixing for 3 minutes, and controlling the temperature to be below 90 ℃ to obtain the agglomerated rubber material.
Step three, mixing by an open mill: and (3) fully cooling the agglomerated rubber material obtained in the step two, adding the agglomerated rubber material into an open mill, opening cooling water, sequentially adding an accelerator (an accelerator TMTD, an accelerator DM), a peroxide vulcanizing agent (dicumyl peroxide, 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane) and a vulcanizing aid (triallyl isocyanurate and triallyl isocyanurate) into the open mill, adjusting the roll distance and then making a triangular bag for 4-5 times after the material is stirred and eaten, and discharging the sheet after the surface of the rubber material is flat and no obvious bubbles exist, thereby completing the mixing process.
Step four, placing the rubber compound obtained in the step three in a metal mold at the temperature of 150 ℃ and the pressure of 6MPa for heating, pressurizing and vulcanizing, wherein the molding time is 40min, and obtaining a product; and heating the product cooled to room temperature to 90 ℃ for 0.5h, heating to 120 ℃ for 0.5h, and heating to 150 ℃ for 3h to obtain the low-temperature-resistant salt-fog-resistant rubber sealing material.
Effects of the embodiment
(1) Test for brittleness temperature
The rubber sealing materials prepared in examples 1 to 3 were subjected to a brittleness temperature test in accordance with national standard GB/T15256-.
TABLE 4 brittle temperature test results of rubber sealing materials prepared in examples 1 to 3
| Test items | Example 1 | Example 2 | Example 3 |
| Brittleness temperature (. degree.C.) | -46 | -48 | -50 |
(2) Test of compression Cold resistance coefficient
The rubber sealing materials prepared in examples 1 to 3 were subjected to a test of the compression cold resistance coefficient with reference to the industry standard HG/T3866-.
TABLE 5 results of the compression Cold resistance test of the rubber sealing materials prepared in examples 1 to 3
| Test items | Example 1 | Example 2 | Example 3 |
| Cold resistance coefficient of compression/(-45 ℃ C.) | 0.25 | 0.27 | 0.32 |
As is clear from tables 4 and 5, the rubber sealing material has a low temperature brittleness temperature of-45 ℃ or lower, a cold resistance coefficient under compression of-45 ℃ or higher of 0.25 or higher, and good low temperature resistance.
(3) And testing of alternating salt spray resistance
The rubber sealing materials prepared in examples 1 to 3 were tested according to the industry standard CB 1146.13-1985 test method for environmental testing of marine equipment Kb: the alternating salt spray test is carried out, the test of the tensile strength and the elongation at break of the test sample before and after the alternating salt spray test is carried out by referring to national standard GB/T528-.
TABLE 6 results of tests on alternating salt spray resistance of rubber sealants prepared in examples 1 to 3
As can be seen from Table 6, the rubber sealing materials prepared in examples 1 to 3 have no cracks and cracks in appearance, and have good tensile strength retention rate and tensile elongation retention rate, which indicates that the prepared rubber sealing materials have good alternating salt spray resistance and meet the use requirements of the rubber sealing materials for polar ships. The reason why the alternating salt spray resistance of the rubber sealing material prepared in example 3 is better is that the salt spray resistance of the rubber sealing material can be further improved by using hydrogenated nitrile rubber in combination with a peroxide vulcanizing agent and a vulcanization aid, adding organic modified montmorillonite and a plasticizer having both polar and nonpolar groups to improve the compatibility of the plasticizer and a polar polymer rubber matrix and matching with a secondary vulcanization process.
In conclusion, the rubber sealing material has the performances of low temperature resistance and salt mist resistance, and can meet the requirements of deck mechanical sealing on polar ships and oil-proof sealing of low-temperature pipeline systems.
The present invention provides a low temperature resistant and salt spray resistant rubber sealing material and a method for preparing the same, which are described in detail above, and the principle and the specific implementation mode of the present invention are illustrated herein by using specific examples, which are only used to help understand the method and the core idea of the present invention. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protective scope of the present invention to those skilled in the art.
Claims (10)
1. The low-temperature-resistant and salt-fog-resistant rubber sealing material is characterized by comprising the following components in parts by mass: 100 parts of rubber matrix, 3-5 parts of zinc oxide, 0.5-3 parts of stearic acid, 10-40 parts of montmorillonite, 5-50 parts of carbon black, 0.5-3 parts of anti-aging agent, 5-20 parts of plasticizer and 1-3 parts of accelerator.
2. The low-temperature-resistant salt-fog-resistant rubber sealing material as claimed in claim 1, wherein the rubber matrix is at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of acrylonitrile in the rubber matrix is 17-26%.
3. The low-temperature-resistant salt-fog-resistant rubber sealing material as claimed in claim 1, wherein the montmorillonite is organically modified montmorillonite, the particle size is 16-20 μm, and the interlayer spacing is 2.4-2.6 nm.
4. The low temperature and salt fog resistant rubber sealing material as claimed in claim 1, wherein the carbon black is at least one of medium super abrasion carbon black N220, high abrasion carbon black N330, and fast extrusion carbon black N550.
5. The low-temperature-resistant salt-fog-resistant rubber sealing material as claimed in claim 1, wherein the antioxidant is at least one of antioxidant ODA, antioxidant 4010NA, antioxidant 445, antioxidant MB and antioxidant RD;
the plasticizer is at least one of plasticizer TP-95, plasticizer TP-90B, plasticizer TOTM and plasticizer DOS;
the accelerator is at least one of an accelerator TMTD and an accelerator DM.
6. The low-temperature-resistant and salt-fog-resistant rubber sealing material as claimed in claim 1, further comprising 0-2 parts by mass of sulfur;
and/or the rubber sealing material further comprises 0-5 parts by mass of a peroxide vulcanizing agent and 0-5 parts by mass of a vulcanizing assistant;
the peroxide vulcanizing agent is at least one of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane and dicumyl peroxide;
the vulcanizing assistant is at least one of triallyl isocyanurate and zinc methacrylate.
7. The low temperature-resistant salt fog-resistant rubber sealing material as claimed in claim 6, wherein the rubber sealing material comprises the following components: 100 parts of hydrogenated nitrile rubber, 5 parts of zinc oxide, 3 parts of stearic acid, 10 parts of montmorillonite, 5 parts of carbon black, 3 parts of anti-aging agent, 20 parts of plasticizer, 1.1 parts of accelerator, 5 parts of peroxide vulcanizing agent and 5 parts of vulcanizing aid.
8. A method for preparing the low-temperature-resistant and salt-fog-resistant rubber sealing material as claimed in claim 6, which comprises the following steps:
step one, plasticating by an open mill: weighing the components according to the proportion of claim 1, and fully plasticating the rubber matrix on a double-roller open mill for later use;
step two, mixing by an internal mixer: putting zinc oxide, stearic acid, an anti-aging agent and the plasticated rubber substrate obtained in the first step into an internal mixer for primary internal mixing at the temperature of not higher than 80 ℃, adding a plasticizer, 50% of montmorillonite and 50% of carbon black into the internal mixer for secondary internal mixing at the temperature of not higher than 90 ℃, and finally adding the remaining 50% of montmorillonite and the remaining 50% of carbon black into the internal mixer for tertiary internal mixing at the temperature of not higher than 90 ℃ to obtain an agglomerated rubber material;
step three, mixing by an open mill: fully cooling the agglomerated rubber material obtained in the step two, placing the agglomerated rubber material into an open mill, sequentially adding an accelerator, sulfur, a peroxide vulcanizing agent and a vulcanizing aid, and mixing until the surface of the rubber material is smooth and has no obvious bubbles to obtain a rubber compound;
step four, vulcanization: and (3) placing the rubber compound obtained in the step three in a metal mold, heating, pressurizing and vulcanizing to obtain a product, and heating the product cooled to room temperature to 150 ℃ to obtain the rubber sealing material.
9. The method for preparing the low-temperature-resistant and salt-fog-resistant rubber sealing material as claimed in claim 8, wherein in the second step, the time for the first banburying is 2min, and the time for the second banburying and the third banburying is 3 min.
10. The method for preparing the low-temperature-resistant and salt-fog-resistant rubber sealing material as claimed in claim 8, wherein in the fourth step, the rubber compound is placed in a metal mold and heated and vulcanized under pressure at the temperature of 145-155 ℃ and the pressure of 6-10 MPa for 35-45 min to obtain a product; taking out the product, cooling to room temperature, placing the product cooled to room temperature in an oven, heating to 90 ℃, preserving heat for 0.5h, heating to 120 ℃, preserving heat for 0.5h, and finally heating to 150 ℃, preserving heat for 1-3 h to obtain the rubber sealing material.
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