Hydrogenation catalyst composition and application thereof as well as hydrogenated butadiene-acrylonitrile rubber and preparation method thereof

Abstract

The invention discloses a hydrogenation catalyst composition and an application thereof, and hydrogenated nitrile rubber and a preparation method thereof, the hydrogenation catalyst composition contains a hydrogenation catalyst, a ligand and an auxiliary agent, and the auxiliary agent is selected from one or more than two of compounds represented by a formula II. The preparation method of the hydrogenated butadiene-acrylonitrile rubber comprises the step of contacting a rubber solution containing butadiene-acrylonitrile rubber with hydrogen under hydrogenation reaction conditions in the presence of the hydrogenation catalyst composition. The hydrogenation catalyst composition provided by the invention has obviously improved hydrogenation reaction activity, can be used for hydrogenation reaction of nitrile rubber, and not only can effectively improve the reaction speed and shorten the reaction time, but also can improve the hydrogenation degree of a product, so that the comprehensive application cost (LoM) pYq (formula II) is relatively low.

Description

Technical Field

[0001] The invention relates to a hydrogenation catalyst composition and application thereof, and also relates to a method for preparing hydrogenated nitrile rubber using the hydrogenation catalyst composition and the hydrogenated nitrile rubber prepared by the method. Background Art

[0002] Hydrogenated nitrile rubber (HNBR) has good oil resistance, heat resistance, high temperature resistance, high pressure resistance, oxidation resistance and mechanical properties, and is increasingly used in high-end automobile manufacturing, oil field drilling, aerospace and other fields. However, due to the harsh preparation conditions and complex processes, the price of hydrogenated nitrile rubber products remains high, which seriously hinders the further expansion of the product's application field and scope.

[0003] There are two main industrial production methods for hydrogenated nitrile rubber: heterogeneous solution hydrogenation and homogeneous solution hydrogenation. The heterogeneous solution hydrogenation method has the problem of high difficulty in catalyst preparation technology and high catalyst residue in the product, but the reaction conditions are mild and the product production process is relatively simple. The shortcomings of the homogeneous solution hydrogenation method are that the hydrogenation catalyst is expensive, the reaction conditions are harsh, the reaction time is long, the hydrogenation efficiency is low, and the process flow is complicated, but the catalyst used in the homogeneous solution hydrogenation method is simple to prepare and the catalyst residue in the product is low.

[0004] In recent years, research on homogeneous solution hydrogenation has mainly focused on the following aspects: finding cheaper metal catalytic systems for efficient selective hydrogenation; improving catalyst hydrogenation activity through various methods under existing catalyst systems; research on catalyst removal technology to achieve a more environmentally friendly, economical and recyclable hydrogenation process; and improving product performance through product structure control. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantage of low hydrogenation reaction efficiency in the existing homogeneous solution hydrogenation method and provide a hydrogenation catalyst composition. The composition has high hydrogenation reaction activity and can be used for hydrogenation reaction of nitrile rubber to significantly improve the hydrogenation degree of the product.

[0006] The inventors of the present invention have found in their research that the use of a hydrogenation catalyst and a ligand in combination with a phosphorus or arsenic-containing additive can effectively improve the hydrogenation reaction activity of the hydrogenation catalyst, increase the hydrogenation reaction rate and the hydrogenation degree of the product, thereby completing the present invention.

[0007] According to a first aspect of the present invention, the present invention provides a hydrogenation catalyst composition, the composition comprising a hydrogenation catalyst, a ligand and an auxiliary agent.

[0008] The hydrogenation catalyst is one or more compounds selected from the group consisting of:

[0009] (Rm A) z RxF n (Formula I)

[0010] In Formula I, m R are the same or different and are independently selected from C1-C8 alkyl, C4-C8 cycloalkyl, C6-C 15 Aryl or C7-C 15 The aralkyl group,

[0011] A is phosphorus, arsenic, sulfur or sulfoxide,

[0012] n X are the same or different, and each independently represents hydrogen or an anion,

[0013] z is 2, 3 or 4, m is 2 or 3, and n is 1, 2 or 3;

[0014] The auxiliary agent is one or more compounds selected from the group consisting of:

[0015] (L o M) p Y q (Formula II)

[0016] In formula II, o L are the same or different and are independently C1-C8 alkyl, C4-C8 cycloalkyl, C6-C 15 Aryl or C7-C 15 The aralkyl group,

[0017] M is phosphorus or arsenic,

[0018] q Y are the same or different and are each independently an anion,

[0019] o is 3, 4, 5 or 6, p is 1, 2 or 3, and q is 1, 2 or 3.

[0020] According to a second aspect of the present invention, the present invention provides use of the catalyst composition described in the first aspect of the present invention as a catalyst for hydrogenation of nitrile rubber.

[0021] According to the third aspect of the present invention, the present invention provides a method for preparing hydrogenated nitrile rubber, the method comprising contacting a rubber solution containing nitrile rubber with hydrogen under hydrogenation reaction conditions in the presence of a hydrogenation catalyst composition to obtain a hydrogenation reaction mixture, wherein the hydrogenation catalyst composition is the composition described in the first aspect of the present invention.

[0022] According to a fourth aspect of the present invention, the present invention provides a hydrogenated nitrile rubber prepared by the method described in the third aspect of the present invention.

[0023] The hydrogenation catalyst composition of the invention has significantly improved hydrogenation reaction activity and is used for hydrogenation reaction of nitrile rubber, which can not only effectively increase the reaction speed and shorten the reaction time, but also increase the hydrogenation degree of the product, so the comprehensive application cost is low.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] According to a first aspect of the present invention, the present invention provides a hydrogenation catalyst composition, which comprises a hydrogenation catalyst, a ligand and an additive.

[0027] According to the hydrogenation catalyst composition of the present invention, the hydrogenation catalyst is one or more selected from the compounds represented by formula I.

[0028] (R m A) z RxF n (Formula I).

[0029] In Formula I, m R are the same or different and are each independently C1-C8 alkyl, C4-C8 cycloalkyl, C6-C 15 Aryl or C7-C 15 of aralkyl.

[0030] In the present invention, the C1-C8 alkyl group includes a C1-C8 straight-chain alkyl group and a C3-C8 branched-chain alkyl group, and specific examples thereof may include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, 2-methylbutyl, 3-methylbutyl, 2,2-dimethylpropyl, n-hexyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 2,3-dimethylbutyl, 2,2-dimethylbutyl, 3,3-dimethylbutyl, 2-ethylbutyl, n-heptyl, 2-methylhexyl, 3-methylhexyl, 4-methylhexyl, 5-methylhexyl, 2,2-dimethylpentyl, 2,3-dimethylpentyl, 2,4 -dimethylpentyl, 3,3-dimethylpentyl, 3,4-dimethylpentyl, 4,4-dimethylpentyl, 2-ethylpentyl, 3-ethylpentyl, n-octyl, 2-methylheptyl, 3-methylheptyl, 4-methylheptyl, 5-methylheptyl, 6-methylheptyl, 2,2-dimethylhexyl, 2,3-dimethylhexyl, 2,4-dimethylhexyl, 2,5-dimethylhexyl, 3,3-dimethylhexyl, 3,4-dimethylhexyl, 3,5-dimethylhexyl, 4,4-dimethylhexyl, 4,5-dimethylhexyl, 5,5-dimethylhexyl, 2-ethylhexyl, 3-ethylhexyl, 4-ethylhexyl, 2-n-propylpentyl and 2-isopropylpentyl.

[0031] In the present invention, specific examples of the C4-C8 cycloalkyl group may include, but are not limited to, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl and 4-n-butylcyclohexyl.

[0032] In the present invention, C6-C 15 Specific examples of the aryl group may include, but are not limited to, phenyl, naphthyl, 2-methylphenyl, 2-ethylphenyl, 4-methylphenyl, and 4-ethylphenyl.

[0033] In the present invention, the term "aralkyl" means that at least one hydrogen atom in an alkyl group is replaced by an aryl group, which can be represented by Ar x -N-, wherein x Ar are the same or different and are independently aryl, N is alkyl, and x is an integer of 1-3.

[0034] In the present invention, C7-C 15 Specific examples of the aralkyl group may include, but are not limited to, phenylmethyl, phenylethyl, phenyl-n-propyl, phenyl-n-butyl, phenyl-t-butyl, phenyl-isopropyl, phenyl-n-pentyl, and phenyl-n-butyl.

[0035] Preferably, in Formula I, m R are the same or different and are each independently C6-C 15 More preferably, in Formula I, m R's are all phenyl.

[0036] In formula I, A is phosphorus, arsenic, sulfur or sulfoxide. Preferably, in formula I, A is phosphorus.

[0037] In Formula I, n Xs are the same or different and are independently hydrogen or an anion. Preferably, in Formula I, X is an anion. More preferably, in Formula I, X is a halogen ion. Further preferably, in Formula I, X is a chloride ion or a bromide ion. Particularly preferably, in Formula I, X is a chloride ion.

[0038] In Formula I, z is 2, 3 or 4. In Formula I, m is 2 or 3. In Formula I, n is 1, 2 or 3.

[0039] In a preferred embodiment, the hydrogenation catalyst is (PPh3)3RhCl.

[0040] According to the hydrogenation catalyst composition of the present invention, the auxiliary agent is one or more compounds selected from the group consisting of:

[0041] (L o M) p Y q (Formula II).

[0042] In formula II, o L are the same or different and are independently C1-C8 alkyl, C4-C8 cycloalkyl, C6-C 15 Aryl or C7-C 15 Preferably, in Formula II, o L are the same or different and are each independently C6-C 15 More preferably, in Formula II, o L are phenyl.

[0043] In formula II, M is phosphorus or arsenic. Preferably, in formula II, M is phosphorus.

[0044] In formula II, q Y are the same or different and are each independently an anion. Preferably, in formula II, Y is a halide ion. More preferably, in formula II, Y is a chloride ion or a bromide ion. Further preferably, in formula II, Y is a chloride ion.

[0045] In Formula II, o is 3, 4, 5 or 6. In Formula II, p is 1, 2 or 3. In Formula II, q is 1, 2 or 3.

[0046] In a preferred embodiment, the auxiliary agent is (PPh4)Cl and / or (PPh4)Br.

[0047] According to the hydrogenation catalyst composition of the present invention, the content of the auxiliary agent can be selected according to the content of the hydrogenation catalyst. The mass of the auxiliary agent is preferably 0.001-200% of the mass of the hydrogenation catalyst (that is, relative to 100 parts by mass of the hydrogenation catalyst, the amount of the auxiliary agent is 0.001-200 parts by mass), which can more effectively improve the catalytic activity of the hydrogenation catalyst so that the hydrogenation product has a higher degree of hydrogenation. More preferably, the mass of the auxiliary agent is 0.002-160% of the mass of the hydrogenation catalyst. Further preferably, the mass of the auxiliary agent is 0.005-120% of the mass of the hydrogenation catalyst. Further preferably, the mass of the auxiliary agent is 0.01-100% of the mass of the hydrogenation catalyst. In a special embodiment, the mass of the auxiliary agent is 0.05-50% of the mass of the hydrogenation catalyst. In this particularly preferred embodiment, the mass of the auxiliary agent is preferably 0.08-30% of the mass of the hydrogenation catalyst, more preferably 0.1-10% of the mass of the hydrogenation catalyst.

[0048] According to the hydrogenation catalyst composition of the present invention, the ligand may be one or more of an organic phosphine, an organic cerium, a nitrogen-containing organic compound, a sulfur-containing organic compound and an oxygen-containing organic compound. The organic phosphine may be an organic monophosphine or an organic diphosphine. The ligand may be a ligand that is compatible with R in the hydrogenation catalyst. m A is the same as R in the hydrogenation catalyst. m Preferably, the ligand is different from R in the hydrogenation catalyst. m A is the same. In a preferred embodiment, the ligand is an organic monophosphine and / or an organic diphosphine, which can further improve the degree of hydrogenation of the hydrogenated product. In this preferred embodiment, specific examples of the ligand may include, but are not limited to, one or more of triphenylphosphine, 1,3-bis(diphenylphosphino)propane and 1,4-bis(diphenylphosphino)butane. In a more preferred embodiment, the ligand is an organic monophosphine. In a particularly preferred embodiment, the ligand is triphenylphosphine.

[0049] According to the hydrogenation catalyst composition of the present invention, the content of the ligand can be selected according to the content of the hydrogenation catalyst. In a preferred embodiment, the mass ratio of the ligand to the hydrogenation catalyst is 1-20:1, preferably 2-15:1, and more preferably 5-10:1.

[0050] The hydrogenation catalyst composition according to the present invention is particularly suitable as a catalyst for the hydrogenation reaction of nitrile rubber.

[0051] Therefore, according to the second aspect of the present invention, the present invention provides the use of the catalyst composition described in the first aspect of the present invention as a catalyst for the hydrogenation reaction of nitrile rubber.

[0052] According to the third aspect of the present invention, the present invention provides a method for preparing hydrogenated nitrile rubber, the method comprising contacting a rubber solution containing nitrile rubber with hydrogen under hydrogenation reaction conditions in the presence of a hydrogenation catalyst composition to obtain a hydrogenation reaction mixture, wherein the hydrogenation catalyst composition is the hydrogenation catalyst composition described in the first aspect of the present invention.

[0053] The hydrogenation catalyst composition and its composition have been described in detail above and will not be described in detail here.

[0054] According to the method of the present invention, the consumption of the hydrogenation catalyst can be selected according to the consumption of the acrylonitrile-butadiene rubber. In a preferred embodiment, the consumption of the hydrogenation catalyst is 0.01-5% of the acrylonitrile-butadiene rubber quality. In this preferred embodiment, the consumption of the hydrogenation catalyst is more preferably 0.05-1% of the acrylonitrile-butadiene rubber quality. In a more preferred embodiment, the consumption of the hydrogenation catalyst is 0.08-0.5% of the acrylonitrile-butadiene rubber quality. In this more preferred embodiment, the consumption of the hydrogenation catalyst is 0.1-0.3% of the acrylonitrile-butadiene rubber quality.

[0055] According to the method of the present invention, the hydrogenation reaction can be carried out under normal conditions. The temperature of the hydrogenation reaction can be 50-180°C, preferably 80-150°C, and more preferably 90-120°C. The hydrogen pressure can be 0.1-15MPa, preferably 4-12MPa, and more preferably 5-10MPa, and the pressure is a gauge pressure. The duration of the hydrogenation reaction can be selected according to the temperature of hydrogenation and the amount of hydrogen. Generally, the duration of the hydrogenation reaction can be 1-20 hours, preferably 4-16 hours, more preferably 5-12 hours, and further preferably 6-10 hours.

[0056] According to the method of the present invention, the content of nitrile rubber in the glue solution can be a conventional content. Generally, the mass percentage concentration of nitrile rubber in the glue solution can be 2-15%, preferably 4-12%.

[0057] The solvent of the glue containing nitrile rubber can be an organic solvent sufficient to dissolve the nitrile rubber, and its specific examples can include but are not limited to: one or more of aromatic hydrocarbons, halogen-substituted aromatic hydrocarbons, halogenated alkanes, ketones and amides. In a preferred embodiment, the solvent of the glue is one or more of benzene, toluene, xylene, chlorobenzene, dichlorobenzene, trichlorobenzene, acetone, butanone and N,N-dimethylformamide. In a more preferred embodiment, the solvent of the glue is one or more of toluene, xylene, chlorobenzene, dichlorobenzene and trichlorobenzene. In a particularly preferred embodiment, the solvent of the glue is one or more of xylene, toluene and chlorobenzene.

[0058] According to the method of the present invention, the preparation method of the glue containing acrylonitrile-butadiene rubber preferably comprises: the acrylonitrile-butadiene rubber is dissolved in a solvent, and then the acrylonitrile-butadiene rubber is degassed. The acrylonitrile-butadiene rubber glue can be degassed by filling an inert gas into a container that holds the acrylonitrile-butadiene rubber glue, and then exhausting the gas, repeating the inflation and exhausting at least three times.

[0059] According to the method of the present invention, the nitrile rubber can be various nitrile rubbers containing carbon-carbon double bonds (C=C) and cyano groups (-CN), and can be binary nitrile rubber and / or ternary nitrile rubber.

[0060] Preferably, the nitrile rubber is butadiene-acrylonitrile rubber, butadiene-(meth)acrylonitrile rubber, 2-methyl-1,3-butadiene-acrylonitrile rubber, 2-methyl-1,3-butadiene-(meth)acrylonitrile rubber, butadiene-acrylonitrile-acrylic rubber, butadiene-acrylonitrile-methyl acrylate rubber, butadiene-acrylonitrile-ethyl acrylate rubber, butadiene-acrylonitrile-tert-butyl acrylate rubber, butadiene-acrylonitrile-butyl acrylate rubber, butadiene-acrylonitrile-(meth)acrylic rubber, butadiene-acrylonitrile-methyl (meth)acrylate rubber, butadiene-acrylonitrile-ethyl (meth)acrylate rubber, butadiene-acrylonitrile-tert-butyl (meth)acrylate rubber, butadiene-acrylonitrile One or more of nitrile-(meth)acrylate butyl rubber, butadiene-(meth)acrylonitrile-acrylic rubber, butadiene-(meth)acrylonitrile-methyl acrylate rubber, butadiene-(meth)acrylonitrile-ethyl acrylate rubber, butadiene-(meth)acrylonitrile-tert-butyl acrylate rubber, butadiene-(meth)acrylonitrile-butyl acrylate rubber, butadiene-(meth)acrylonitrile-(meth)acrylic rubber, butadiene-(meth)acrylonitrile-methyl (meth)acrylate rubber, butadiene-(meth)acrylonitrile-ethyl (meth)acrylate rubber, butadiene-(meth)acrylonitrile-tert-butyl (meth)acrylate rubber and butadiene-(meth)acrylonitrile-butyl (meth)acrylate rubber.

[0061] More preferably, the nitrile rubber is butadiene-acrylonitrile rubber and / or butadiene-(meth)acrylonitrile rubber.

[0062] According to the method of the present invention, the cyanide content in the nitrile rubber can be conventionally selected. Preferably, the cyanide content in the nitrile rubber is 20-50% by weight. The cyanide content is determined by nuclear magnetic resonance spectroscopy.

[0063] According to the method of the present invention, the organic solvent in the hydrogenation reaction mixture can be removed by conventional methods to obtain the hydrogenated nitrile rubber. For example, the organic solvent in the hydrogenation reaction mixture can be removed by one or more combinations of methods such as ethanol condensation and steam distillation to obtain a hydrogenated product, and then the solvent on the hydrogenated product is removed to obtain a hydrogenated nitrile rubber. There is no particular limitation on the method for removing the solvent on the hydrogenated product, and various methods commonly used by those skilled in the art can be used. In one embodiment, the method for removing the solvent on the hydrogenated product is vacuum drying, and the temperature of the vacuum drying can be 50-100°C, preferably 55-80°C, and more preferably 60-70°C. The duration of the vacuum drying can be selected according to the temperature of the vacuum drying. Generally, the duration of the vacuum drying can be 1-10 hours, preferably 5-8 hours.

[0064] According to a fourth aspect of the present invention, the present invention provides a hydrogenated nitrile rubber prepared by the method described in the third aspect of the present invention.

[0065] The present invention is described in detail below with reference to the embodiments, but the scope of the present invention is not limited thereby.

[0066] In the following examples and comparative examples, (PPh3)3RhCl, (PPh4)Cl and (PPh4)Br were purchased from J&K Company.

[0067] In the following examples and comparative examples, butadiene-acrylonitrile rubber was purchased from Lanhua Company with a brand name of N21L and a cyanide content of 41% by mass.

[0068] In the following examples and comparative examples, the degree of hydrogenation of hydrogenated nitrile rubber was determined by nuclear magnetic resonance spectroscopy, and the degree of hydrogenation was calculated by “Nuclear magnetic resonance analysis method for microstructure and hydrogenation degree calculation of hydrogenated nitrile rubber [J]. Petrochemical Industry, 2014, 43: 403-405”.

[0069] In the following examples and comparative examples, unless otherwise specified, pressures are gauge pressures.

[0070] Examples 1-13 are used to illustrate the preparation method of the hydrogenation catalyst composition and hydrogenated nitrile rubber of the present invention.

[0071] Embodiment 1-13 adopts the following method to prepare hydrogenated nitrile rubber:

[0072] (1) dissolving the nitrile rubber in an organic solvent to obtain a nitrile rubber solution, and degassing the nitrile rubber solution;

[0073] (2) adding a hydrogenation catalyst, a ligand and an auxiliary agent to the nitrile rubber liquid, then charging hydrogen gas, and reacting with stirring, wherein the reaction conditions include: a reaction temperature of B°C, a hydrogen pressure of AMPa, and a reaction time of C hours;

[0074] (3) The hydrogenation reaction mixture was condensed with ethanol to precipitate a hydrogenation product, and the hydrogenation product was vacuum dried at 60° C. for 8 hours to obtain a hydrogenated nitrile rubber.

[0075] In Examples 1-13, the concentration of the rubber solution (i.e., the mass percentage concentration of the nitrile rubber in the rubber solution), the catalyst / nitrile rubber (i.e., the mass ratio of the hydrogenation catalyst to the nitrile rubber), the ligand / catalyst (i.e., the mass ratio of the ligand to the hydrogenation catalyst), the auxiliary agent / catalyst (i.e., the mass ratio of the auxiliary agent to the hydrogenation catalyst), the reaction conditions A, B and C, the hydrogenation degree of the obtained hydrogenated product, and the measurement results of the cyanide reduction are shown in Table 1.

[0076] Comparative Examples 1-4

[0077] Comparative Example 1-4 uses the same method as Example 1-13 to prepare hydrogenated nitrile rubber, except that the reaction conditions are as shown in Table 1, and the hydrogenation degree and cyanide reduction of the prepared hydrogenated nitrile rubber are listed in Table 1.

[0078] Table 1

[0079]

[0080]

[0081] Comparing Example 1 with Comparative Example 1, Example 2 with Comparative Example 2, and Example 8 with Comparative Example 3, it can be seen that the hydrogenation catalyst composition according to the present invention has higher hydrogenation reaction activity, and can obtain a hydrogenated product with a higher degree of hydrogenation within the same reaction time.

[0082] Comparing Example 1 with Comparative Example 4, it can be seen that, when the amount of hydrogenation catalyst is the same, the hydrogenation catalyst composition according to the present invention can achieve a better hydrogenation effect in a shorter time, thereby reducing the possibility of gel formation in the hydrogenation product.

[0083] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A hydrogenation catalyst composition comprising a hydrogenation catalyst, a ligand and an auxiliary agent, The hydrogenation catalyst is one or more compounds selected from the group consisting of: (R m A) z RxF n (Formula I) In Formula I, m R are the same or different and are independently selected from C1-C8 alkyl, C4-C8 cycloalkyl, C6-C 15 Aryl or C7-C 15 The aralkyl group, A is phosphorus, arsenic, sulfur or sulfoxide, n X are the same or different, and each independently represents hydrogen or an anion, z is 2, 3 or 4, m is 2 or 3, and n is 1, 2 or 3; The auxiliary agent is one or more compounds selected from the group consisting of: (L o M) p Y q (Formula II) In formula II, o L are the same or different and are independently C1-C8 alkyl, C4-C8 cycloalkyl, C6-C 15 Aryl or C7-C 15 The aralkyl group, M is phosphorus or arsenic, q Y are the same or different and are each independently an anion, o is 3, 4, 5 or 6, p is 1, 2 or 3, and q is 1, 2 or 3.

2. The catalyst composition according to claim 1, wherein The hydrogenation catalyst is (PPh3)3RhCl.

3. The catalyst composition according to claim 1 or 2, wherein The ligand is one or more of an organic phosphine, an organic cerium, a nitrogen-containing organic compound, a sulfur-containing organic compound and an oxygen-containing organic compound; Preferably, the ligand is an organic monophosphine; More preferably, the ligand is triphenylphosphine.

4. The catalyst composition according to any one of claims 1 to 3, wherein The auxiliary agent is (PPh4)Cl and / or (PPh4)Br.

5. The catalyst composition according to any one of claims 1 to 4, wherein The mass ratio of the ligand to the hydrogenation catalyst is 1-20:1, preferably 2-15:1, and more preferably 5-10:

1.

6. The catalyst composition according to any one of claims 1 to 5, wherein The mass of the auxiliary agent is 0.001-200% of the mass of the hydrogenation catalyst, preferably 0.002-160%, more preferably 0.005-120%.

7. Use of the catalyst composition described in any one of claims 1 to 6 as a catalyst for hydrogenation of nitrile rubber.

8. A method for preparing hydrogenated nitrile rubber, the method comprising contacting a rubber solution containing nitrile rubber with hydrogen under hydrogenation reaction conditions in the presence of a hydrogenation catalyst composition to obtain a hydrogenation reaction mixture, characterized in that: The hydrogenation catalyst composition is the composition according to any one of claims 1 to 6.

9. The method according to claim 8, wherein: The amount of the hydrogenation catalyst in the hydrogenation catalyst composition is 0.01-5% of the mass of the nitrile rubber, preferably 0.05-1%, and more preferably 0.08-0.5%.

10. The method according to claim 8, wherein: The hydrogenation reaction conditions include: reaction temperature of 50-180°C, hydrogen pressure of 0.1-15MPa, reaction time of 1-20 hours, and the pressure is gauge pressure; Preferably, the hydrogenation reaction conditions include: reaction temperature of 80-150° C., hydrogen pressure of 4-12 MPa, reaction time of 4-16 hours, and the pressure is gauge pressure.

11. The method according to claim 8, wherein: The mass percentage concentration of the nitrile rubber in the rubber solution is 2-15%, preferably 4-12%.

12. The method according to claim 8 or 11, wherein: The solvent of the glue solution is one or more selected from aromatic hydrocarbons, halogen-substituted aromatic hydrocarbons, halogenated alkanes, ketones and amides; Preferably, the solvent of the glue solution is one or more of benzene, toluene, xylene, chlorobenzene, dichlorobenzene, trichlorobenzene, acetone, butanone and N,N-dimethylformamide.

13. The method according to any one of claims 8, 11 and 12, wherein: The preparation method of the rubber solution comprises: dissolving the nitrile rubber in a solvent and then rearranging and degassing.

14. The method according to any one of claims 8 to 13, wherein: The nitrile rubber is a binary nitrile rubber and / or a ternary nitrile rubber; Preferably, the nitrile rubber is butadiene-acrylonitrile rubber, butadiene-(meth)acrylonitrile rubber, 2-methyl-1,3-butadiene-acrylonitrile rubber, 2-methyl-1,3-butadiene-(meth)acrylonitrile rubber, butadiene-acrylonitrile-acrylic rubber, butadiene-acrylonitrile-methyl acrylate rubber, butadiene-acrylonitrile-ethyl acrylate rubber, butadiene-acrylonitrile-tert-butyl acrylate rubber, butadiene-acrylonitrile-butyl acrylate rubber, butadiene-acrylonitrile-(meth)acrylic rubber, butadiene-acrylonitrile-methyl (meth)acrylate rubber, butadiene-acrylonitrile-ethyl (meth)acrylate rubber, butadiene-acrylonitrile-tert-butyl (meth)acrylate rubber, butadiene-acrylonitrile One or more of nitrile-(meth)acrylate butyl rubber, butadiene-(meth)acrylonitrile-acrylic rubber, butadiene-(meth)acrylonitrile-methyl acrylate rubber, butadiene-(meth)acrylonitrile-ethyl acrylate rubber, butadiene-(meth)acrylonitrile-tert-butyl acrylate rubber, butadiene-(meth)acrylonitrile-butyl acrylate rubber, butadiene-(meth)acrylonitrile-(meth)acrylic rubber, butadiene-(meth)acrylonitrile-methyl (meth)acrylate rubber, butadiene-(meth)acrylonitrile-ethyl (meth)acrylate rubber, butadiene-(meth)acrylonitrile-tert-butyl (meth)acrylate rubber and butadiene-(meth)acrylonitrile-butyl (meth)acrylate rubber; More preferably, the nitrile rubber is butadiene-acrylonitrile rubber and / or butadiene-(meth)acrylonitrile rubber.

15. A hydrogenated nitrile rubber prepared by the method described in any one of claims 8 to 14.

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