Perfluoropolyether-modified polybutadiene rubber, method for preparing the same, and use thereof

Abstract

The present application relates to perfluoropolyether modified polybutadiene rubber and its preparation method and application. The perfluoropolyether modified polybutadiene rubber comprises a first structural unit and a second structural unit, the first structural unit is composed of a structure derived from a poly conjugated diene conjugated diene monomer including but not limited to isoprene or 1,3-butadiene and a structure derived from perfluoropolyether, and the second structural unit is composed of a structure derived from a poly conjugated diene conjugated diene monomer including but not limited to isoprene or 1,3-butadiene and a structure derived from perfluoropolyether. The perfluoropolyether modified polybutadiene rubber of the present application has excellent chemical stability, heat resistance, low temperature resistance, lubricity and low dielectric constant.

Description

Technical Field

[0001] This invention belongs to the field of synthetic rubber, and in particular relates to a perfluoropolyether modified polybutadiene rubber, its preparation method and application. Background Technology

[0002] Polybutadiene rubber is a general-purpose synthetic rubber obtained by polymerization of 1,3-butadiene as a monomer. Cis-butadiene rubber is the abbreviation for cis-1,4-polybutadiene rubber. Its cis structure content is more than 95%, and it has the advantages of high elasticity, good low temperature performance, and good wear resistance.

[0003] However, butadiene rubber has problems such as easy wear under high load conditions, easy aging at high temperatures, and heat generation due to molecular chain friction.

[0004] Chinese patent CN113166534B discloses a perfluoropolyether-based rubber composition that provides a cured product with excellent heat resistance, low-temperature resistance, organic solvent resistance, and acid resistance. It contains: (a) a linear perfluoropolyether compound with a number average molecular weight of 1,000 to 100,000 having at least two azide groups in one molecule and a divalent perfluoroalkyl ether structure in the main chain; and (b) a linear perfluoropolyether compound having at least three acetylene groups in one molecule. However, this patent provides a novel perfluoropolyether-based rubber composition and is not a solution for modifying polybutadiene rubber.

[0005] Chinese patent CN115368573A discloses the preparation and application of a silane polymer containing polyether segments, used to improve the compatibility of inorganic fillers such as silica and carbon black with the rubber matrix, as well as the dispersion state of the fillers in the rubber matrix. Simultaneously, the silane polymer containing polyether segments prepared by this invention can effectively reduce VOC gases generated during industrial production using traditional silane coupling agents. Although this solution also states that the addition of the silane polymer coupling agent containing polyether segments significantly reduces the loss factor and compression fatigue temperature rise of the rubber composite material, and reduces the rolling resistance and hysteresis effect of the rubber, it does not address how to solve problems such as the easy aging of rubber at high temperatures and the heat generated by molecular chain friction.

[0006] Chinese patent CN117801143A discloses a modified polydiolefin liquid rubber. Specifically, the modified polydiolefin liquid rubber is grafted with acryloyloxy photosensitive groups. The purpose of grafting acryloyloxy photosensitive groups is to increase the polarity of the liquid rubber, thereby improving its adhesiveness. However, this solution does not address how to improve the polydiolefin liquid rubber's susceptibility to aging at high temperatures and the heat generated by molecular chain friction.

[0007] Chinese patent CN116693958B discloses a highly wear-resistant organofluorine-modified solution-polymerized styrene-butadiene rubber (SBR) and its preparation method. This method involves mixing a functionalized fluoropolymer with SBR, followed by open milling and vulcanization to obtain the highly wear-resistant organofluorine-modified SBR. However, this method uses fluoropolymer modification specifically for SBR. Furthermore, the modification involves blending two pre-reacted, end-capped raw rubbers or rubber compounds through extrusion and shearing. Essentially, it blends pre-formed rubber raw materials using a mixing mill, without addressing the regulation of the polymer molecular chain structure. Moreover, this modification aims to alter its frictional properties, without addressing issues such as the aging of polydiolefin liquid rubber at high temperatures and the generation of heat through molecular chain friction. Summary of the Invention

[0008] Based on the problems of cis-butadiene rubber being prone to wear under high load conditions, aging at high temperatures, and generating heat through molecular chain friction, this invention provides a perfluoropolyether modified polybutadiene rubber, its preparation method, and its application.

[0009] This invention significantly improves the performance of cis-butadiene rubber by using perfluoropolyether groups.

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] In a first aspect, the present invention provides a perfluoropolyether-modified polybutadiene rubber, wherein the perfluoropolyether-modified polybutadiene rubber comprises a first structural unit and a second structural unit.

[0012] The first structural unit is shown below:

[0013]

[0014] The second structural unit is shown below:

[0015]

[0016] In the first structural unit, the selection range of n is 100 to 1800, the selection range of p is 300 to 2000, and the selection range of q is 100 to 4000.

[0017] In the second structural unit, the selection range of n is 100 to 2000, the selection range of p is 300 to 2000, and the selection range of q is 100 to 4000.

[0018] The molar ratio of the first structure to the second structure in the perfluoropolyether modified polybutadiene rubber is 0.25 to 4:1.

[0019] The perfluoropolyether modified polybutadiene rubber has a molecular weight of 64,000-200,000 and a molecular weight distribution index of 1.2-1.5.

[0020] The first structural unit consists of structure I and structure III, and the second structural unit consists of structure II and structure III.

[0021] Structure I, Structure II, and Structure III are shown below:

[0022]

[0023] Structures I and II are derived from polyconjugated dienes; structure III is derived from perfluoropolyethers.

[0024] In a second aspect, the present invention provides a method for preparing perfluoropolyether-modified polybutadiene rubber, comprising the following steps:

[0025] 1) Mix the polyconjugated diene rubber and the rubber solvent to completely dissolve the polyconjugated diene rubber, thus obtaining a polyconjugated diene rubber solution;

[0026] 2) Mix the polyconjugated diene rubber solution with perfluoropolyether and perfluoropolyether solvent evenly and wait for the reaction to proceed. The reaction is carried out in an inert atmosphere. After replacing the air in the container with an inert gas, a catalyst is added to carry out the olefin metathesis reaction to obtain perfluoropolyether modified polyconjugated diene rubber, namely perfluoropolyether modified polybutadiene rubber.

[0027] In one embodiment of the present invention, in step 1), the polyconjugated diene rubber includes the following structures I and II:

[0028]

[0029] The reaction equation for structure I in the polyconjugated diene rubber is as follows:

[0030]

[0031] The reaction equation for structure II in the polyconjugated diene rubber is as follows:

[0032]

[0033] In one embodiment of the present invention, in step 1), the polyconjugated diene rubber and the solvent are mixed by stirring or shaking.

[0034] In one embodiment of the present invention, the rubber solvent used to dissolve the polyconjugated diene rubber is selected from one or more of cyclopentane, hexane, cyclohexane, heptane, dichloromethane, trichloromethane, carbon tetrachloride, methyl propyl ketone, diacetone, acetone, benzene, toluene, xylene, chlorobenzene, tetrahydrofuran, or ethylene glycol butyl ether. Preferably, the rubber solvent is toluene and / or chlorobenzene, and more preferably, the rubber solvent is chlorobenzene.

[0035] In one embodiment of the present invention, in step 1), the amount of rubber solvent added is not particularly limited, and can be reasonably set according to the conventional addition amount in the current polybutadiene rubber preparation process. The selection basis is to ensure that the polyconjugated diene rubber is completely dissolved.

[0036] In one embodiment of the present invention, the perfluoropolyether is selected from one of K-type perfluoropolyether, D-type perfluoropolyether, Y-type perfluoropolyether or Z-type perfluoropolyether, preferably, the perfluoropolyether is K-type perfluoropolyether.

[0037] In this invention, perfluoropolyether is an important substance used in the preparation process of perfluoropolyether-modified polybutadiene rubber. Perfluoropolyether is a liquid polymer compound composed only of three elements: C, F, and O. It possesses properties such as heat resistance, oxidation resistance, corrosion resistance, radiation resistance, and non-flammability. In this invention, under the action of a catalyst, the polybutadiene rubber undergoes chain scission and then recombines with the perfluoropolyether to obtain perfluoropolyether-modified polybutadiene rubber. This invention utilizes the olefin metathesis reaction to first break the carbon-carbon double bonds of the polybutadiene rubber, and then recombine the molecular chains with the perfluoropolyether.

[0038] In one embodiment of the present invention, the perfluoropolyether solvent is selected from at least one of fluorinated solvents and non-fluorinated solvents. The fluorinated solvents include, for example, p-trifluorotoluene and nonafluorobutyl methyl ether, and the non-fluorinated solvents include, for example, ethanol, ethyl acetate (such as methoxyethanol), butyl acetate, tetrahydrofuran, ethylene glycol dimethyl ether, and diethylene glycol dimethyl ether. The perfluoropolyether solvent is preferably a fluorinated solvent, and more preferably, trifluorotoluene.

[0039] In one embodiment of the present invention, the catalyst is an olefin metathesis catalyst selected from multiple or one of GrubbsⅠ (G1st), GrubbsⅡ (G2nd), GrubbsⅢ (G3rd), Hoveyda-GrubbsⅠ (H-G1st), and Hoveyda-GrubbsⅡ (H-G2nd), preferably using GrubbsⅡ (G2nd) or Hoveyda-GrubbsⅡ (H-G2nd) as the catalyst, and more preferably using GrubbsⅡ (G2nd) as the catalyst.

[0040] In one embodiment of the present invention, in step 2), the mass ratio of polyconjugated diene rubber, catalyst, and perfluoropolyether is (100-10000):0.05:(100-200), preferably (2000-3000):0.05:(100-150).

[0041] In one embodiment of the present invention, in step 2), the inert gas is selected as nitrogen.

[0042] Since the reaction process of perfluoropolyether-modified polybutadiene rubber should be completed in an inert environment to avoid the generated active polymer reacting with oxygen in the air, which would affect the reaction process and the performance of the reaction products, this invention introduces an inert gas into the reactor, such as high-purity nitrogen into the reaction vessel, to isolate it from air.

[0043] This invention does not impose any particular restrictions on the order of adding the components before the reaction. Typically, the polybutadiene rubber is first dissolved in a solvent to prepare a solution, which usually takes more than 10 hours. Then, the polybutadiene rubber solution and the perfluoropolyether solution are mixed evenly, and the system is heated to the temperature required for the reaction. Then, the catalyst is added to start the reaction.

[0044] In one embodiment of the present invention, in step 2), the temperature of the reaction system is controlled at 60-100°C during the reaction, and the reaction time from the addition of the catalyst to the termination of the reaction is more than 6 hours.

[0045] In one embodiment of the present invention, after the reaction is completed, the process further includes post-processing the reaction system to obtain a high-purity perfluoropolyether modified polybutadiene rubber product.

[0046] In one specific embodiment, the post-processing includes: coagulating the crude product with anhydrous ethanol, placing the coagulated product in an oven, and removing the solvent by vacuum evaporation to obtain perfluoropolyether modified polybutadiene rubber.

[0047] The molecular weight of the perfluoropolyether-modified polybutadiene rubber prepared by the above method of the present invention is [missing information].

[0048] 64,000-200,000, molecular weight distribution index 1.2-1.5.

[0049] The perfluoropolyether modified polybutadiene rubber provided by this invention has excellent chemical stability, heat resistance, low temperature performance, lubricity, and low dielectric constant.

[0050] A third aspect of the present invention provides the application of the perfluoropolyether modified polybutadiene rubber, wherein the perfluoropolyether modified polybutadiene rubber is used as a general-purpose rubber, that is, as a solid compound.

[0051] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0052] This invention employs an olefin metathesis reaction to graft polyether onto butadiene rubber, resulting in perfluoropolyether-modified butadiene rubber. The perfluoropolyether-modified butadiene rubber retains the excellent low-temperature properties of butadiene rubber; its glass transition temperature is tested to be -107℃. Simultaneously, due to the presence of the perfluoropolyether groups, its high-temperature performance and chemical inertness are significantly improved, allowing it to be used in more demanding environments.

[0053] Compared with the existing technology, which discloses a similar patent CN116693958B that uses rubber compounding to modify polystyrene-butadiene rubber, the modification principle of this application is to perform graft modification by controlling the opening and closing of the bonds of the two polymers. Essentially, it is a combination of open and broken chemical bonds of the polymers, which involves the regulation of microstructure and mainly changes the polymer molecular chain structure, resulting in a better modification effect on polybutadiene rubber.

[0054] Compared with the existing patent CN117801143A, which discloses a similar scheme to increase the polarity of liquid rubber by grafting acryloyloxy photosensitive groups, the scheme of this application uses perfluoropolyether modification to solve the problems of easy aging of polydiolefin liquid rubber at high temperature and heat generation by molecular chain friction. The perfluoropolyether modification of polybutadiene rubber in this application also improves its molecular weight distribution, glass transition temperature and pyrolysis temperature, which is not covered in the prior art. Attached Figure Description

[0055] Figure 1 The infrared spectrum of the perfluoropolyether-modified polybutadiene rubber prepared in Example 1;

[0056] Figure 2 The 1H NMR spectrum of the perfluoropolyether-modified polybutadiene rubber prepared in Example 1;

[0057] Figure 3 The NMR fluorine spectrum of the perfluorinated polyether modified polybutadiene rubber prepared in Example 1 is shown. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Unless otherwise specified, the raw materials used in the following examples can be obtained by commercial purchase or conventional methods. Experimental methods without specific conditions are conventional methods and conditions well known in the art.

[0060] Example 1

[0061] This embodiment provides a perfluoropolyether-modified polybutadiene rubber, the preparation method of which includes the following steps:

[0062] (1) Add 5g of cis-polybutadiene rubber and 100mL of chlorobenzene to a conical flask, fix the conical flask on an automatic shaker, and shake at room temperature for 12 hours until the cis-polybutadiene rubber is completely dissolved in the chlorobenzene to form a solution.

[0063] (2) Add 2 mL of K-type perfluoropolyether and 10 mL of perfluoropolyether solvent p-trifluorotoluene to the chlorobenzene solution of cis-polybutadiene. After mixing evenly, heat to 80 °C under a nitrogen atmosphere, then add 0.01 g of olefin metathesis catalyst and react for 6 h. After the reaction is completed, cool to room temperature, add 100 mL of ethanol for extraction, collect the condensed perfluoropolyether modified polybutadiene rubber, dry to remove solvent, and obtain the product perfluoropolyether modified polybutadiene rubber.

[0064] Example 2

[0065] This embodiment provides a perfluoropolyether-modified polybutadiene rubber, the preparation method of which includes the following steps:

[0066] (1) Add 5g of cis-polybutadiene rubber and 100mL of cyclopentane to a conical flask, fix the conical flask on an automatic shaker, and shake at room temperature for 15h until the cis-polybutadiene rubber is completely dissolved in the cyclopentane to form a solution.

[0067] (2) Add 2 mL of K-type perfluoropolyether and 10 mL of perfluoropolyether solvent nonafluorobutyl methyl ether to the cyclopentane solution of cis-polybutadiene. After mixing evenly, heat to 50 °C under a nitrogen atmosphere, then add 0.01 g of olefin metathesis catalyst and react for 6 h. After the reaction is completed, cool to room temperature, add 100 mL of ethanol for extraction, collect the condensed perfluoropolyether modified polybutadiene rubber, dry to remove solvent, and obtain the product perfluoropolyether modified polybutadiene rubber.

[0068] Example 3

[0069] This embodiment provides a perfluoropolyether-modified polybutadiene rubber, the preparation method of which includes the following steps:

[0070] (1) Add 5g of cis-polybutadiene rubber and 100mL of cyclopentane to a conical flask, fix the conical flask on an automatic shaker, and shake at room temperature for 15h until the cis-polybutadiene rubber is completely dissolved in the cyclopentane to form a solution.

[0071] (2) Add 1.8 mL of type D perfluoropolyether and 10 mL of perfluoropolyether solvent p-trifluorotoluene to the cyclopentane solution of cis-polybutadiene. After mixing evenly, heat to 40 °C under a nitrogen atmosphere, then add 0.01 g of olefin metathesis catalyst and react for 6 h. After the reaction is completed, cool to room temperature, add 100 mL of ethanol for extraction, collect the condensed perfluoropolyether modified polybutadiene rubber, dry to remove solvent, and obtain the product perfluoropolyether modified polybutadiene rubber.

[0072] Example 4

[0073] This embodiment provides a perfluoropolyether-modified polybutadiene rubber, the preparation method of which includes the following steps:

[0074] (1) Add 8g of polybutadiene rubber and 120mL of chlorobenzene to a conical flask, fix the conical flask on an automatic shaker, and shake at room temperature for 15h until the polybutadiene rubber is completely dissolved in the chlorobenzene to form a solution.

[0075] (2) Add 1.5 mL of K-type perfluoropolyether and the perfluoropolyether solvent nonafluorobutyl methyl ether to the chlorobenzene solution of polybutadiene, mix evenly, heat to 60 °C under nitrogen atmosphere, then add 0.02 g of olefin metathesis catalyst and react for 7 h; after the reaction is completed, cool to room temperature, add 120 mL of ethanol for extraction, collect the condensed perfluoropolyether modified polybutadiene rubber, dry to remove solvent, and obtain the product perfluoropolyether modified polybutadiene rubber.

[0076] Example 5

[0077] This embodiment provides a perfluoropolyether-modified polybutadiene rubber, the preparation method of which includes the following steps:

[0078] (1) Add 10g of polybutadiene rubber and 150mL of cyclopentane to a conical flask, fix the conical flask on an automatic shaker, and shake at room temperature for 18h until the butadiene rubber is completely dissolved in the cyclopentane to form a solution.

[0079] (2) Add 3 mL of Y-type perfluoropolyether and 10 mL of perfluoropolyether solvent p-trifluorotoluene to the cyclopentane solution of polybutadiene. After mixing evenly, heat to 80 °C under a nitrogen atmosphere, then add 0.02 g of olefin metathesis catalyst and react for 10 h. After the reaction is completed, cool to room temperature, add 150 mL of ethanol for extraction, collect the condensed perfluoropolyether modified polybutadiene rubber, dry to remove solvent, and obtain the product perfluoropolyether modified polybutadiene rubber.

[0080] Example 6

[0081] This embodiment provides a perfluoropolyether-modified polybutadiene rubber, the preparation method of which includes the following steps:

[0082] (1) Add 5g of polybutadiene rubber and 100mL of chlorobenzene to a conical flask, fix the conical flask on an automatic shaker, and shake at room temperature for 14 hours until the polybutadiene rubber is completely dissolved in the chlorobenzene to form a solution.

[0083] (2) Add 1.5 mL of Z-type perfluoropolyether and 10 mL of perfluoropolyether solvent p-trifluorotoluene to the chlorobenzene solution of polybutadiene rubber, mix well, heat to 80 °C under nitrogen atmosphere, then add 0.01 g of olefin metathesis catalyst and react for 8 h; after the reaction is completed, cool to room temperature, add 100 mL of ethanol for extraction, collect the condensed perfluoropolyether modified polybutadiene rubber, dry to remove solvent, and obtain the product perfluoropolyether modified polybutadiene rubber.

[0084] The raw material ratios and reaction conditions used in the different embodiments described above are shown in Table 1.

[0085] Table 1. Raw material ratios and reaction conditions used in different embodiments.

[0086]

[0087] The microstructures of the samples obtained from the different embodiments described above are shown in Table 2.

[0088] Table 2. Microstructure of samples obtained from different embodiments

[0089]

[0090] Figure 1 The infrared spectrum of the perfluoropolyether-modified polybutadiene rubber prepared in Example 1; Figure 2 The 1H NMR spectrum of the perfluoropolyether-modified polybutadiene rubber prepared in Example 1; Figure 3 The image shows the NMR fluorine spectrum of the perfluorinated polyether-modified polybutadiene rubber prepared in Example 1. The infrared spectroscopy was performed using a Bruker ALPHA II instrument; the CS2 film was dissolved and coated on a potassium bromide plate, and the fluorine spectrum was measured by transmission electron microscopy. In addition to the typical characteristic absorption peaks of cis-butadiene rubber, the infrared spectrum shows a strong and broad absorption peak at 1200 cm⁻¹, which is the typical absorption peak of the CF₂ bond in the CH₂=CF₂ sequence of fluorinated rubber. Further observation revealed… Figure 2 The hydrogen spectrum shows two symmetrical peaks at shifts of 3.5–4.2, which are characteristic peaks of CH2=CF2, proving that perfluorinated modified polybutadiene rubber can be prepared by the described method.

[0091] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A perfluoropolyether-modified polybutadiene rubber, characterized in that, The perfluoropolyether-modified polybutadiene rubber comprises a first structural unit and a second structural unit. The first structural unit is shown below: The second structural unit is shown below: In the first structural unit, the selection range of n is 100 to 1800, the selection range of p is 300 to 2000, and the selection range of q is 100 to 4000; In the second structural unit, the selection range of n is 100 to 2000, the selection range of p is 300 to 2000, and the selection range of q is 100 to 4000; The molar ratio of the first structure to the second structure in the perfluoropolyether modified polybutadiene rubber is 0.25 to 4:1; The perfluoropolyether-modified polybutadiene rubber has a molecular weight of 64,000-200,000 and a molecular weight distribution index of 1.2-1.

5. The perfluoropolyether modified polybutadiene rubber is a solid rubber.

2. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 1, characterized in that, Includes the following steps: 1) Mix the polyconjugated diene rubber and the rubber solvent to completely dissolve the polyconjugated diene rubber, thus obtaining a polyconjugated diene rubber solution; 2) Mix the polyconjugated diene rubber solution with perfluoropolyether and perfluoropolyether solvent evenly and wait for the reaction to proceed. The reaction is carried out in an inert atmosphere. After replacing the air in the container with an inert gas, a catalyst is added to carry out the olefin metathesis reaction to obtain perfluoropolyether modified polyconjugated diene rubber, namely perfluoropolyether modified polybutadiene rubber.

3. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, In step 1), the polyconjugated diene rubber includes the following structures I and II:

4. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, The rubber solvent used to dissolve the polyconjugated diene rubber is selected from one or more of cyclopentane, hexane, cyclohexane, heptane, dichloromethane, trichloromethane, carbon tetrachloride, methyl propyl ketone, diacetone, acetone, benzene, toluene, xylene, chlorobenzene, tetrahydrofuran, or ethylene glycol butyl ether.

5. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, The perfluoropolyether is selected from one of the following: K-type perfluoropolyether, D-type perfluoropolyether, Y-type perfluoropolyether, or Z-type perfluoropolyether.

6. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, The perfluoropolyether solvent is selected from at least one of fluorinated solvents and non-fluorinated solvents. The fluorinated solvents include trifluorotoluene and nonafluorobutyl methyl ether, and the non-fluorinated solvents include ethanol, methoxyethanol, ethyl acetate, butyl acetate, tetrahydrofuran, ethylene glycol dimethyl ether, and diethylene glycol dimethyl ether.

7. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, The catalyst is an olefin metathesis catalyst, selected from one or more of GrubbsⅠ (G1st), GrubbsⅡ (G2nd), GrubbsⅢ (G3rd), Hoveyda-GrubbsⅠ (H-G1st), and Hoveyda-GrubbsⅡ (H-G2nd).

8. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, In step 2), the mass ratio of polyconjugated diene rubber, catalyst, and perfluoropolyether is (100-10000): 0.05: (100-200).

9. The method for preparing perfluoropolyether-modified polybutadiene rubber according to claim 2, characterized in that, In step 2), the temperature of the reaction system is controlled at 60-100°C during the reaction, and the reaction time from the addition of the catalyst to the termination of the reaction is more than 6 hours.

10. The application of the perfluoropolyether-modified polybutadiene rubber according to claim 1, characterized in that, The perfluoropolyether modified polybutadiene rubber is used as a general-purpose rubber.

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