A hydrogenated nitrile rubber having high tensile strength and high tear strength, and a method for producing and use thereof

Abstract

This invention provides a hydrogenated nitrile butadiene rubber (NBR) with high tensile strength and high tear strength, its preparation method, and its applications, belonging to the field of chemical materials. This invention utilizes an alkali / phase transfer catalytic system to perform post-carboxylation modification on hydrogenated NBR raw rubber, obtaining carboxylated hydrogenated NBR raw rubber. Using this carboxylated hydrogenated NBR raw rubber as raw material, further hydrogenated NBR is produced, achieving a simultaneous improvement in the tensile and tear strength of the hydrogenated NBR while maintaining good elongation at break and hardness. This enhances the overall mechanical properties of the hydrogenated NBR without affecting its heat aging resistance and oil resistance. This invention solves the problems of poor filler dispersibility and limited performance improvement associated with traditional physical modification methods, broadening the application scope of hydrogenated NBR in high-end fields and emerging markets such as automotive manufacturing, oil exploration, and aerospace.

Description

Technical Field

[0001] This invention belongs to the field of chemical materials, specifically relating to a hydrogenated nitrile butadiene rubber with high tensile strength and high tear strength, its preparation method, and its uses. Background Technology

[0002] Hydrogenated nitrile butadiene rubber (HNBR) is a synthetic rubber produced by hydrogenation modification of nitrile butadiene rubber (NBR). It is characterized by a highly saturated molecular backbone. The strongly polar cyano groups (-CN) on the molecular chain impart excellent oil resistance; the saturated carbon chain structure formed after hydrogenation gives it excellent heat resistance, ozone aging resistance, and weather resistance. Due to its comprehensive performance advantages, HNBR has been widely used in automotive manufacturing, oil exploration, aerospace, and other fields, gradually replacing various more expensive specialty rubbers.

[0003] With the rapid development of industries such as automobile manufacturing, oil exploration, and aerospace, traditional HNBRs are no longer able to meet the stringent usage requirements brought about by industry upgrades. The increasing number of deep and ultra-deep well extraction operations in the oil exploration field forces HNBR sealing components to withstand long-term exposure to extreme high-temperature and high-pressure environments. This places higher standards on the overall performance of HNBRs, requiring not only excellent heat and oil resistance but also outstanding mechanical properties, especially significantly improved tensile and tear strength.

[0004] Optimizing the HNBR matrix alone cannot meet increasingly stringent application requirements and significantly increases production costs. Currently, industrial applications primarily employ physical blending modification, adding reinforcing fillers through a mixing process to improve the mechanical properties of HNBR. Carbon black and silica are the most commonly used reinforcing fillers in the rubber industry. Carbon black effectively improves rubber's mechanical properties and can be used as a colorant, while silica is environmentally friendly, does not rely on petroleum resources, and possesses excellent reinforcing effects. However, traditional filler blending modification methods require high filler loadings to achieve ideal reinforcing effects. This not only increases rubber density and reduces material elasticity and processing fluidity but also easily causes filler agglomeration and uneven dispersion, resulting in limited performance improvement or even performance degradation. This fails to meet the high tensile and tear strength requirements of high-end applications for HNBR. Furthermore, if the interfacial bonding strength between the filler and the HNBR matrix relies solely on physical adsorption or weak interactions, it is prone to failure under repeated stress or high temperatures, failing to fully realize the reinforcing potential of the filler.

[0005] Therefore, there is an urgent need to develop an HNBR modification technology that can significantly improve the tensile strength and tear strength of HNBR while maintaining its excellent resistance to media and temperature, so that HNBR can be adapted to the extreme and complex working conditions in fields such as automobile manufacturing, oil exploration, and aerospace. Summary of the Invention

[0006] The purpose of this invention is to provide a hydrogenated nitrile butadiene rubber with high tensile strength and high tear strength, as well as its preparation method and uses.

[0007] The present invention provides a modified hydrogenated nitrile butadiene rubber raw rubber, the preparation method of which includes the following steps: (1) dissolving the hydrogenated nitrile butadiene rubber raw rubber in a solvent system, then adding an alkaline solution, then adding a phase transfer catalyst, and reacting; (2) cooling, washing, and drying after the reaction is completed to obtain the modified hydrogenated nitrile butadiene rubber raw rubber.

[0008] Further, the solvent system is a first solvent or a mixture of the first solvent and the second solvent; the first solvent is selected from at least one of cyclic ether aprotic solvents and aliphatic ketone aprotic solvents; the second solvent is selected from at least one of sulfoxide aprotic solvents and amide aprotic solvents; in the mixed solution, the mass ratio of the first solvent and the second solvent is 1:1 to 2:1; The alkali is at least one of sodium hydroxide and potassium hydroxide; the amount of alkali used is 10% to 30% of the mass of hydrogenated nitrile rubber raw rubber; The phase transfer catalyst is at least one of tetrabutylammonium bromide and polyethylene glycol; the amount of the phase transfer catalyst used is 10% to 20% of the mass of hydrogenated nitrile rubber raw rubber; The reaction is carried out at a temperature of 60-85°C for 24-30 hours.

[0009] Further, the cyclic ether aprotic solvent is selected from at least one of tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, tetrahydropyran, and 3-methyltetrahydrofuran; the aliphatic ketone aprotic solvent is selected from at least one of butanone, acetone, 3-pentanone, and methyl isobutyl ketone; the sulfoxide aprotic solvent is selected from at least one of dimethyl sulfoxide, methyl ethyl sulfoxide, and diethyl sulfoxide; and the amide aprotic solvent is selected from at least one of N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, N,N-diethylformamide, and N,N-diethylacetamide. The amount of alkali used is 10% to 20% of the mass of hydrogenated nitrile rubber raw rubber; The amount of the phase transfer catalyst is 10% to 15% of the mass of the hydrogenated nitrile rubber raw rubber; The reaction temperature is 75~80℃.

[0010] Furthermore, the solvent system is a mixed solution of tetrahydrofuran and dimethyl sulfoxide.

[0011] Furthermore, the pH of the system is adjusted to 6-8 before the washing process.

[0012] The present invention also provides a method for preparing modified hydrogenated nitrile butadiene rubber raw rubber, comprising the following steps: (1) dissolving hydrogenated nitrile butadiene rubber raw rubber in a solvent system, then adding an alkaline solution, then adding a phase transfer catalyst, and reacting; (2) cooling, washing, and drying after the reaction to obtain modified hydrogenated nitrile butadiene rubber raw rubber; or (2) cooling after the reaction, adjusting the pH of the system to 6-8, washing, and drying to obtain modified hydrogenated nitrile butadiene rubber raw rubber.

[0013] The present invention also provides a hydrogenated nitrile butadiene rubber, which is made from raw materials comprising the following parts by weight: 100 parts of modified hydrogenated nitrile butadiene rubber raw rubber, 40-60 parts of reinforcing agent, 4-8 parts of vulcanizing agent, 3-7 parts of metal oxide, 1-2 parts of antioxidant and 1-2 parts of internal release agent.

[0014] Further, hydrogenated nitrile butadiene rubber is prepared from raw materials comprising the following parts by weight: 100 parts modified hydrogenated nitrile butadiene rubber raw rubber, 50 parts reinforcing agent, 6 or 7.5 parts vulcanizing agent, 5 parts metal oxide, 1.5 parts antioxidant and 1.5 parts internal release agent.

[0015] Further, the reinforcing agent is selected from at least one of carbon black, diatomaceous earth, silica, calcium carbonate, and talc; the vulcanizing agent is selected from at least one of 2,5-di-tert-butylperoxide-2,5-dimethylethane, hexamethylenediaminecarbamate, di-tert-butylperoxide, dicumyl peroxide, 1,1-di-tert-butylperoxide-cyclohexane, di-tert-butylperoxide-isocumyl, m-phenylenediamine, 4,4'-diaminodiphenylmethane, and hexamethylenediamine; the metal oxide is selected from at least one of zinc oxide, magnesium oxide, and calcium oxide; the antioxidant is selected from at least one of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, N-phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, 2-mercaptobenzimidazole, antioxidant RD, and antioxidant MB; and the internal release agent is selected from at least one of WB222, stearic acid, zinc stearate, fatty acid amide, and polyethylene wax.

[0016] Further, the hydrogenated nitrile butadiene rubber is prepared from raw materials comprising the following parts by weight: 100 parts of modified hydrogenated nitrile butadiene rubber raw rubber, 50 parts of carbon black, 6 parts of 2,5-di-tert-butylperoxide-2,5-dimethylethane, 5 parts of zinc oxide, 1.5 parts of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, and 1.5 parts of WB222.

[0017] Further, hydrogenated nitrile butadiene rubber is prepared from raw materials comprising the following parts by weight: 100 parts modified hydrogenated nitrile butadiene rubber raw rubber, 50 parts carbon black, 6 parts 2,5-di-tert-butylperoxide-2,5-dimethylethane, 1.5 parts hexamethylenediamine carbamate, 5 parts zinc oxide, 1.5 parts 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, and 1.5 parts WB222.

[0018] The present invention also provides a method for preparing hydrogenated nitrile butadiene rubber, wherein the raw materials are mixed and kneaded until uniformly dispersed, then subjected to open milling and triangular packaging; after resting, they are re-kneaded to obtain a compound; finally, the compound is subjected to a first-stage vulcanization and a second-stage vulcanization to obtain hydrogenated nitrile butadiene rubber.

[0019] Furthermore, the storage time is 24~48h; the first stage of vulcanization is vulcanization at 180~200℃ for 10~20min; and the second stage of vulcanization is vulcanization at 150~170℃ for 4~8h.

[0020] This invention also provides modified hydrogenated nitrile butadiene rubber raw rubber and the use of hydrogenated nitrile butadiene rubber in the preparation of rubber products in the fields of automobile manufacturing, oil exploration, and aerospace.

[0021] This invention utilizes an alkali / phase transfer catalytic system to perform post-carboxylation modification on highly saturated hydrogenated nitrile butadiene rubber (NBR) raw material, resulting in carboxylated hydrogenated NBR (XHNBR). Furthermore, hydrogenated NBR (HNBR) is prepared from XHNBR, achieving a simultaneous improvement in the tensile strength and tear strength of HNBR while maintaining good elongation at break. This enhances the overall mechanical properties of HNBR without affecting its heat aging resistance and oil resistance.

[0022] Meanwhile, the main chain saturation of hydrogenated nitrile butadiene rubber raw rubber is extremely high (>99%), which essentially eliminates carbon-carbon double bonds. The saturated main chain structure is more rigid, reducing the flexibility of the polymer chain and hindering the OH group. - The diffusion of cyano groups within the system, nearing the cyano reaction center, leads to low overall chemical reactivity and low interfacial mass transfer efficiency in the hydrogenated nitrile butadiene rubber (HNBR) raw rubber. In this invention, when the first and second solvents are used as a co-solvent, the second solvent, acting as a strongly polar aprotic solvent, effectively stabilizes the reaction intermediates through dipole-dipole interactions and hydrogen bonding, lowering the activation energy and accelerating the reaction rate, thus achieving good solubility and reactivity in the hydrogenated HNBR raw rubber. Experiments have shown that, compared to a single first solvent, a mixed solution of the first and second solvents at a mass ratio of 1:1 to 2:1 is more conducive to the reaction, resulting in XHNBR with a higher carboxyl content, low gel content, and suitable Mooney viscosity, exhibiting excellent processing properties.

[0023] In addition, the alkaline solution and its dosage, the phase transfer catalyst and its dosage, and the reaction temperature all affect the carboxyl content, gel content, and Mooney viscosity of XHNBR. Experiments showed that the optimal conditions were a 1:1 mass ratio of THF and DMSO, a reaction temperature of 80℃, a 20wt% sodium hydroxide solution as the alkali, and a 15wt% tetrabutylammonium bromide (TBAB) phase transfer catalyst. XHNBR prepared under these optimal conditions had the highest carboxyl content (0.96wt%). HNBR prepared using this optimal XHNBR as raw material exhibited the best tensile strength (32.5MPa) and tear strength (78.1kN / m), while maintaining a high elongation at break of 406.4% and suitable hardness, demonstrating the best overall mechanical properties.

[0024] This invention provides a modification technology that simultaneously improves the tensile and tear strength of HNBR. The technology involves carboxylating HNBR raw rubber and then compounding and vulcanizing it with other raw materials to obtain HNBR. This solves the problems of poor filler dispersibility and limited performance improvement associated with traditional physical modification. It significantly improves the tensile and tear strength of HNBR while maintaining good elongation at break and hardness, without affecting the heat resistance and oil resistance of HNBR. This meets the diverse needs of various industries for high-performance rubber materials and broadens the application scope of HNBR in high-end fields such as automobile manufacturing, oil exploration, and aerospace, as well as emerging markets.

[0025] Obviously, based on the above description of the present invention, and according to common technical knowledge and conventional methods in the field, various other modifications, substitutions or alterations can be made without departing from the basic technical concept of the present invention.

[0026] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following embodiments. All technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Detailed Implementation

[0027] The raw materials and equipment used in this invention are all known products, obtained by purchasing commercially available products.

[0028] In the specific embodiments, the HNBR raw rubber used is HNBR3406, purchased from Arontech High Performance Elastomers Co., Ltd., with the brand name Therban®3406, an acrylonitrile content of 34%, and a saturation of >99%.

[0029] Examples 1-12: Preparation of modified HNBR raw rubber (XHNBR) Prepared according to the reaction conditions in Table 1 as follows: (1) Dissolve 100g of HNBR raw rubber in a solvent system in a three-necked flask, add the alkaline solution dropwise to the three-necked flask under mechanical stirring, add the phase transfer catalyst, mix evenly, and then turn on the constant temperature oil bath to react at the reaction temperature for 24h. (2) After the reaction is completed, the system is naturally cooled to room temperature. The pH of the system is adjusted to 7 using 1 mol / L HCl solution. Then, the system is flocculated in ethanol solution three times or more until the washing solution is clear. The obtained gel sample is dried in a 60℃ drying oven to obtain modified HNBR raw rubber, hereinafter referred to as XHNBR.

[0030] Table 1 Reaction conditions for step (1) in Examples 1-12 Examples 13-18: Preparation of HNBR According to the formula in Table 2, XHNBR was prepared as follows: XHNBR was added to a mixing mill along with reinforcing agent, vulcanizing agent, metal oxide, antioxidant, and internal release agent. After complete absorption, the mixture was transferred to a two-roll mill and formed into six triangular bundles to ensure thorough mixing of all raw materials. The mixture was then left to stand at room temperature for 24 hours and then re-milled on the two-roll mill to obtain the compound. Subsequently, the compound was fed into a flat vulcanizing mill and vulcanized at 180°C for 10 minutes. After vulcanization, the compound was placed in an oven and vulcanized in two stages at 150°C for 4 hours to obtain HNBR.

[0031] Table 2. Formulations (parts by weight) for Examples 13-18 Antioxidant 445: 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0032] Comparative Example 1: Preparation of HNBR Referring to Example 17, the only difference is that XHNBR is replaced with unmodified HNBR raw rubber.

[0033] Comparative Example 2: Preparation of HNBR Referring to Example 18, the only difference is that XHNBR is replaced with unmodified HNBR raw rubber.

[0034] Experimental Example 1: Carboxyl content, gel content, and Mooney viscosity of XHNBR 1.1 Experimental Methods Carboxyl content test: The carboxyl content was calculated using acid-base titration with methyl red as an indicator and 0.1 mol / L sodium hydroxide in ethanol solution. The carboxyl content (wt%) = (V-V0)×c×45 / m, where V is the volume of standard solution consumed in the titration of the sample, V0 is the volume consumed in the blank titration, c is the concentration of the standard solution, and m is the sample mass.

[0035] Gel content test: The crosslinking density determination method was used. The sample was placed in a 300-mesh stainless steel mesh bag and weighed. It was then soaked in tetrahydrofuran for 24 hours, rinsed, and dried in a vacuum oven at 60℃ to constant weight. Gel content (wt%) = (W2-(W1-W0)) / W0×100%, where W0 is the initial mass of the sample, W1 is the total mass of the bag and the initial sample, and W2 is the total mass of the bag and the dried gel.

[0036] Mooney viscosity test: The test shall be conducted in accordance with GB / T1232.1-2016.

[0037] 1.2 Experimental Results As shown in Table 3, the comparison of Examples 1-3 shows that, compared to Example 3 which used pure THF as the solvent system, the XHNBR prepared in Examples 1-2 using a mixed solution of THF and DMSO at a mass ratio of 1:1 to 2:1 as the solvent system has a higher carboxyl content, lower gel content, and suitable Mooney viscosity. Furthermore, this invention also uses pure DMSO or a mixed solution of THF and DMSO at a mass ratio of 1:2 as the solvent system, but the HNBR raw rubber has poor solubility in this solvent system, making further experiments impossible.

[0038] This indicates that pure THF and a mixed solution of THF and DMSO in a mass ratio of 1:1 to 2:1 are the preferred solvent systems for preparing XHNBR. Compared with pure THF, the mixed solution of THF and DMSO in a mass ratio of 1:1 to 2:1 can significantly increase the carboxyl content of XHNBR without increasing the gel content and Mooney viscosity. Among them, the XHNBR prepared by the mixed solution of THF and DMSO in a mass ratio of 1:1 has the highest carboxyl content, which is 0.96 wt%.

[0039] Comparison of Examples 3-6 shows that while a reaction temperature of 85°C can increase the carboxyl content of XHNBR, it also significantly increases its gel content and Mooney viscosity, which is detrimental to the processing performance of XHNBR. Conversely, a decrease in reaction temperature drastically reduces the carboxyl content of XHNBR. This indicates that 80°C is the preferred reaction temperature.

[0040] A comparison of Examples 3 and 7-9 shows that when the sodium hydroxide solution concentration is 30 wt%, the carboxyl content of XHNBR increases, as does its gel content and Mooney viscosity, while the processing performance of XHNBR decreases. When the sodium hydroxide solution concentration is 10 wt%, the carboxyl content of XHNBR decreases. When the sodium hydroxide solution is replaced with potassium hydroxide solution, the carboxyl content of XHNBR decreases significantly. This indicates that a 20 wt% sodium hydroxide solution is the preferred alkaline solution for the reaction.

[0041] A comparison of Examples 3 and 10-12 shows that when the amount of TBAB is 20 wt%, the changes in carboxyl content, gel content, and Mooney viscosity of XHNBR are not significant; when the amount of TBAB is 10 wt%, the carboxyl content of XHNBR decreases; and when TBAB is replaced with PEG-600, the carboxyl content of XHNBR decreases significantly. This indicates that 15 wt% TBAB is the preferred phase transfer catalyst.

[0042] The above experimental results demonstrate that this invention achieves XHNBR by post-carboxylation modification of highly saturated HNBR raw rubber using an alkali / phase transfer catalytic system. The optimal process conditions were determined through comparative analysis of the reaction solvent system, alkali, phase transfer catalyst, and temperature: a solvent system of pure THF and a mixed solution of THF and DMSO in a mass ratio of 1:1 to 2:1; a reaction temperature of 80°C; a alkali of 10 wt% to 20 wt% sodium hydroxide solution; and a phase transfer catalyst of 10 wt% to 20 wt% TBAB. The optimal process conditions were: a solvent system of a mixed solution of THF and DMSO in a mass ratio of 1:1; a reaction temperature of 80°C; a alkali of 20 wt% sodium hydroxide solution; and a phase transfer catalyst of 15 wt% TBAB.

[0043] Table 3 shows the carboxyl content, gel content, and Mooney viscosity of XHNBR from Examples 1-12. Experimental Example 2: Mechanical Property Testing of HNBR 2.1 Experimental Methods The hardness of the vulcanizate shall be tested using a Shore hardness tester in accordance with GB / T 531.2-2009, and the tensile properties and tear strength shall be tested on a universal testing machine in accordance with GB / T 528-2009 and GB / T 529-2008.

[0044] 2.2 Experimental Results As shown in Table 4, compared with Comparative Example 1, the HNBRs of Examples 13-17 all have improved tensile strength and tear strength, indicating that the HNBRs further prepared using the XHNBR prepared in this invention can achieve simultaneous improvement in tensile strength and tear strength.

[0045] As can be seen from Examples 13-17, with the increase of carboxyl content in XHNBR, the tensile strength and tear strength of the prepared HNBR gradually increase. Although the elongation at break gradually decreases, it can still be greater than 400%. Among them, the HNBR prepared from XHNBR with a carboxyl content of 0.96wt% has the best tensile strength (32.5MPa) and tear strength (78.1kN / m), as well as an elongation at break of 406.4%, exhibiting the best comprehensive mechanical properties.

[0046] The comparison between Example 18 and Comparative Example 2 also shows that the HNBR prepared using the XHNBR of the present invention as raw material can achieve simultaneous improvement in tensile strength and tear strength, while maintaining good elongation at break.

[0047] Furthermore, while improving the tensile and tear strength of HNBR, this invention does not significantly increase the hardness of HNBR, thus exhibiting good elasticity.

[0048] As shown in Table 5, compared with HNBR made from conventional unmodified HNBR raw rubber, the heat aging resistance and oil resistance of HNBR further prepared from XHNBR prepared in this invention are not significantly different, indicating that XHNBR does not have interfacial compatibility issues and significantly improves the tensile strength and tear strength of HNBR.

[0049] Table 4 Mechanical properties of HNBR in Examples 13-18 and Comparative Examples 1-2 Table 5. Heat aging resistance and oil resistance of HNBR in Examples 17-18 and Comparative Examples 1-2 In summary, this invention modifies highly saturated HNBR raw rubber by post-carboxylation using an alkali / phase transfer catalytic system to obtain XHNBR; and further prepares HNBR using XHNBR as raw material, achieving simultaneous improvement in the tensile strength and tear strength of HNBR while maintaining good elongation at break and hardness, thus improving the comprehensive mechanical properties of HNBR without affecting its heat aging resistance and oil resistance. The optimal process conditions for preparing XHNBR are as follows: a mixed solution of THF and DMSO in a mass ratio of 1:1 as the solvent system, a reaction temperature of 80℃, a 20wt% sodium hydroxide solution as the alkali, and a 15wt% TBAB as the phase transfer catalyst. The XHNBR prepared under the optimal process conditions has the highest carboxyl content (0.96wt%). The HNBR prepared using this optimal XHNBR as raw material has the best tensile strength (32.5MPa) and tear strength (78.1kN / m), while maintaining a high elongation at break of 406.4% and suitable hardness, exhibiting the best comprehensive mechanical properties.

Claims

1. A modified hydrogenated nitrile rubber gum characterized in that, Its preparation method includes the following steps: (1) dissolving hydrogenated nitrile rubber raw rubber in a solvent system, then adding an alkaline solution, then adding a phase transfer catalyst, and reacting; (2) cooling, washing, and drying after the reaction is completed to obtain modified hydrogenated nitrile rubber raw rubber.

2. The modified hydrogenated nitrile rubber gum of claim 1, wherein, The solvent system is a first solvent or a mixture of the first solvent and the second solvent; the first solvent is selected from at least one of cyclic ether aprotic solvents and aliphatic ketone aprotic solvents; the second solvent is selected from at least one of sulfoxide aprotic solvents and amide aprotic solvents; in the mixed solution, the mass ratio of the first solvent and the second solvent is 1:1 to 2:1; The alkali is at least one of sodium hydroxide and potassium hydroxide; the amount of alkali used is 10% to 30% of the mass of hydrogenated nitrile rubber raw rubber; The phase transfer catalyst is at least one of tetrabutylammonium bromide and polyethylene glycol; the amount of the phase transfer catalyst used is 10% to 20% of the mass of hydrogenated nitrile rubber raw rubber; The reaction is carried out at a temperature of 60-85°C for 24-30 hours.

3. The modified hydrogenated nitrile rubber gum of claim 2, wherein, The cyclic ether aprotic solvent is selected from at least one of tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, tetrahydropyran, and 3-methyltetrahydrofuran; the aliphatic ketone aprotic solvent is selected from at least one of butanone, acetone, 3-pentanone, and methyl isobutyl ketone; the sulfoxide aprotic solvent is selected from at least one of dimethyl sulfoxide, methyl ethyl sulfoxide, and diethyl sulfoxide; the amide aprotic solvent is selected from at least one of N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, N,N-diethylformamide, and N,N-diethylacetamide. The amount of alkali used is 10% to 20% of the mass of hydrogenated nitrile rubber raw rubber; The amount of the phase transfer catalyst is 10% to 15% of the mass of the hydrogenated nitrile rubber raw rubber; The reaction temperature is 75~80℃.

4. The modified hydrogenated nitrile butadiene rubber raw rubber according to claim 3, characterized in that, The solvent system is a mixed solution of tetrahydrofuran and dimethyl sulfoxide.

5. The modified hydrogenated nitrile butadiene rubber raw rubber according to any one of claims 1 to 4, characterized in that, Before washing, the pH of the system is adjusted to 6-8.

6. The process for producing a modified hydrogenated nitrile rubber raw rubber according to any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Dissolve hydrogenated nitrile rubber raw rubber in a solvent system, then add an alkaline solution, then add a phase transfer catalyst, and react; (2) After the reaction is completed, cool, wash and dry to obtain modified hydrogenated nitrile rubber raw rubber; or (2) After the reaction is completed, cool, adjust the pH of the system to 6~8, wash and dry to obtain modified hydrogenated nitrile rubber raw rubber.

7. A hydrogenated nitrile rubber, characterized by, It is made from raw materials comprising the following parts by weight: 100 parts of modified hydrogenated nitrile rubber raw rubber as described in any one of claims 1 to 5, 40 to 60 parts of reinforcing agent, 4 to 8 parts of vulcanizing agent, 3 to 7 parts of metal oxide, 1 to 2 parts of antioxidant and 1 to 2 parts of internal release agent.

8. The hydrogenated nitrile rubber according to claim 7, characterized in that, The reinforcing agent is selected from at least one of carbon black, diatomaceous earth, silica, calcium carbonate, and talc; the vulcanizing agent is selected from at least one of 2,5-di-tert-butylperoxide-2,5-dimethylethane, hexamethylenediaminecarbamate, di-tert-butylperoxide, dicumyl peroxide, 1,1-di-tert-butylperoxide-cyclohexane, di-tert-butylperoxide-isocumyl, m-phenylenediamine, 4,4'-diaminodiphenylmethane, and hexamethylenediamine; the metal oxide is selected from at least one of zinc oxide, magnesium oxide, and calcium oxide; the antioxidant is selected from at least one of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, N-phenyl-α-naphthylamine, N-phenyl-β-naphthylamine, 2-mercaptobenzimidazole, antioxidant RD, and antioxidant MB; the internal release agent is selected from at least one of WB222, stearic acid, zinc stearate, fatty acid amide, and polyethylene wax.

9. The process for the preparation of hydrogenated nitrile rubber according to any one of claims 7 to 8, characterized in that, After mixing and kneading the raw materials until they are evenly dispersed, the mixture is then rolled into triangular bundles. After resting, it is re-kneaded to obtain the compound rubber. Finally, the compound rubber is subjected to a first-stage vulcanization and a second-stage vulcanization to obtain hydrogenated nitrile rubber.

10. The use of the modified hydrogenated nitrile butadiene rubber raw rubber according to any one of claims 1 to 5 and the hydrogenated nitrile butadiene rubber according to any one of claims 7 to 8 in the preparation of rubber products in the fields of automobile manufacturing, oil exploration, aerospace and other fields.

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