Carbon dioxide resistant rubber and application thereof

Abstract

The invention relates to carbon dioxide resistant rubber and application thereof, and belongs to the technical field of rubber sealing materials. The carbon dioxide-resistant rubber is prepared from the following components in parts by weight: 90 to 110 parts of hydrogenated butadiene-acrylonitrile rubber, 50 to 80 parts of carbon black, 5 to 15 parts of filler, 3 to 6 parts of zinc chloride, 1 to 5 parts of assistant crosslinker, 1.5 to 4 parts of anti-aging agent, 0.5 to 2 parts of stearic acid and 3 to 5 parts of dicumyl peroxide. The carbon black, the filler, the zinc oxide, the assistant crosslinker, the anti-aging agent, the stearic acid and the dicumyl peroxide are added into the hydrogenated butadiene-acrylonitrile rubber, so that the performance of the rubber is further improved, the rubber has excellent physical and mechanical properties, heat resistance and carbon dioxide corrosion resistance, and the underground tool rubber sleeve produced from the rubber is ensured to have excellent mechanical properties in a carbon dioxide environment. And the service life of the rubber sleeve is more than 10 times of that of a common rubber production downhole tool rubber sleeve.

Description

Technical Field

[0001] The present application relates to the technical field of rubber sealing materials, and in particular to a carbon dioxide-resistant rubber and applications thereof. Background Art

[0002] Downhole tools are composed of basic materials and rubber sealing materials. When exploiting rock gas layers containing carbon dioxide, the rubber of downhole tools is the key to the sealing and pressure-bearing performance of the entire tool. The sealing performance of downhole tools determines whether the exploitation is smooth.

[0003] When the temperature of carbon dioxide is higher than the critical temperature Tc=31.26℃ and the pressure is higher than the critical pressure Pc=72.9atm, its properties will change. Its density is close to that of liquid, its viscosity is close to that of gas, and its diffusion coefficient is 100 times that of liquid. Therefore, it has amazing solubility and permeability, and is called supercritical fluid. During the gas layer mining process, when carbon dioxide reaches a critical state, the corrosion effect on rubber materials is manifested as the volume of the material increases, the physical and mechanical properties decrease, bubbles of different sizes appear on the surface and inside of the material, the air tightness decreases, the pressure bearing capacity decreases, and the sealing fails, which further increases the construction cost. Summary of the invention

[0004] The present application provides a carbon dioxide resistant rubber and application thereof, so as to improve the carbon dioxide resistance performance of the rubber.

[0005] In a first aspect, the present application provides a carbon dioxide resistant rubber, wherein the components of the carbon dioxide resistant rubber include, by weight:

[0006] 90-110 parts of hydrogenated nitrile rubber, 50-80 parts of carbon black, 5-15 parts of filler, 3-6 parts of zinc chloride, 1-5 parts of cross-linking agent, 1.5-4 parts of antioxidant, 0.5-2 parts of stearic acid and 3-5 parts of diisopropylbenzene peroxide.

[0007] As an optional embodiment, the components of the carbon dioxide resistant rubber include, by weight:

[0008] 95-105 parts of hydrogenated nitrile rubber, 60-70 parts of carbon black, 8-12 parts of filler, 4-5 parts of zinc chloride, 2-5 parts of cross-linking agent, 2-3.5 parts of antioxidant, 1-1.5 parts of stearic acid and 3.5-4.5 parts of diisopropylbenzene peroxide.

[0009] As an optional embodiment, the components of the carbon dioxide resistant rubber include, by weight:

[0010] 98-102 parts of hydrogenated nitrile rubber, 63-67 parts of carbon black, 9-11 parts of filler, 4-5 parts of zinc chloride, 3-5 parts of cross-linking agent, 2.5-3.5 parts of antioxidant, 1-1.2 parts of stearic acid and 3.5-4.5 parts of diisopropylbenzene peroxide.

[0011] As an optional implementation, the filler includes zinc acrylate filler.

[0012] As an optional implementation, the zinc acrylate filler includes at least one of zinc monomethacrylate, zinc dimethacrylate, modified zinc diacrylate and modified zinc dimethacrylate.

[0013] As an optional embodiment, the acrylonitrile content of the hydrogenated nitrile rubber is 39% to 44%; and / or

[0014] The saturation degree of the hydrogenated nitrile rubber is 92% to 99%; and / or

[0015] The raw rubber Mooney viscosity ML1+4 (100° C.) of the hydrogenated nitrile rubber is 60-100.

[0016] As an optional implementation, the auxiliary cross-linking agent includes at least one of triallyl isocyanurate, triallyl cyanurate and trimethylolpropane trimethacrylate.

[0017] As an optional embodiment, the antioxidant includes at least one of 4,4'-dioctyldiphenylamine; 4,4'-diisooctyldiphenylamine, octylated diphenylamine, 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 2-mercaptomethylbenzimidazole zinc and 4.4'-bis(α.α-dimethylbenzyl)diphenylamine.

[0018] In a second aspect, the present application provides an application of a carbon dioxide resistant rubber, wherein the rubber is the carbon dioxide resistant rubber described in the first aspect, and the application includes using the rubber for sealing in a carbon dioxide critical environment, wherein the temperature of the carbon dioxide critical environment is not less than 31.26°C, and the pressure of the carbon dioxide critical environment is not less than 72.9atm.

[0019] In a third aspect, the present application provides an application of a carbon dioxide resistant rubber, wherein the rubber is the carbon dioxide resistant rubber described in the first aspect, and the application includes using the rubber in downhole tools for oil and gas extraction.

[0020] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0021] The rubber provided in the embodiment of the present application further improves the performance of the rubber by adding carbon black, filler, zinc oxide, cross-linking agent, anti-aging agent, stearic acid, and diisopropylbenzene peroxide to hydrogenated nitrile rubber, so that the rubber has excellent physical and mechanical properties, heat resistance and carbon dioxide corrosion resistance, ensuring that the service life of the downhole tool rubber cartridge produced by the rubber is more than 10 times that of the downhole tool rubber cartridge produced by ordinary rubber in a carbon dioxide environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 This is a schematic diagram of the structure of a rubber carbon dioxide corrosion resistance test specimen provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0027] Downhole tools are composed of basic materials and rubber sealing materials. When exploiting rock gas layers containing carbon dioxide, the rubber of downhole tools is the key to the sealing and pressure-bearing performance of the entire tool. The sealing performance of downhole tools determines whether the exploitation is smooth.

[0028] When the temperature of carbon dioxide is higher than the critical temperature Tc=31.26℃ and the pressure is higher than the critical pressure Pc=72.9atm, its properties will change. Its density is close to that of liquid, its viscosity is close to that of gas, and its diffusion coefficient is 100 times that of liquid. Therefore, it has amazing solubility and permeability, and is called supercritical fluid. During the gas layer mining process, when carbon dioxide reaches a critical state, the corrosion effect on rubber materials is manifested as the volume of the material increases, the physical and mechanical properties decrease, bubbles of different sizes appear on the surface and inside of the material, the air tightness decreases, the pressure bearing capacity decreases, and the sealing fails, which further increases the construction cost.

[0029] The inventor intends to provide a rubber having excellent physical and mechanical properties, heat resistance and carbon dioxide corrosion resistance to ensure the reliability of downhole tool rubber cartridges produced from the rubber in the exploitation of rock gas strata containing carbon dioxide media.

[0030] An embodiment of the present application provides a carbon dioxide resistant rubber, wherein the components of the carbon dioxide resistant rubber include, by weight: 90 to 110 parts of hydrogenated nitrile rubber, 50 to 80 parts of carbon black, 5 to 15 parts of filler, 3 to 6 parts of zinc chloride, 1 to 5 parts of a cross-linking agent, 1.5 to 4 parts of an antioxidant, 0.5 to 2 parts of stearic acid, and 3 to 5 parts of diisopropylbenzene peroxide.

[0031] Hydrogenated nitrile rubber has excellent oil resistance, heat resistance, corrosion resistance and high mechanical strength, but under high temperature, high pressure and acidic medium conditions, the above properties can only reach one-third of the normal state at most. The rubber provided in the embodiment of the present application further improves the performance of the rubber by adding carbon black, filler, zinc oxide, cross-linking agent, anti-aging agent, stearic acid and diisopropylbenzene peroxide to hydrogenated nitrile rubber, so that the rubber has excellent physical and mechanical properties, heat resistance and carbon dioxide corrosion resistance, ensuring that the downhole tool rubber cartridge produced by the rubber has a service life of more than 10 times that of the downhole tool rubber cartridge produced by ordinary rubber in a carbon dioxide environment.

[0032] Among them, carbon black is a black powder with a very light texture and small particle size. It has a large surface area, generally ranging from 10 to 3000m2 / g. It is a product generated by thermal decomposition of carbon-containing substances such as coal and natural gas under incomplete combustion. Carbon black has good reinforcing properties. The simultaneous use of carbon black and zinc acrylate fillers can reduce the permanent deformation of rubber and greatly improve the sealing performance of rubber products.

[0033] The filler includes a zinc acrylate filler. When the zinc acrylate filler is triggered by free radicals generated by peroxide, the zinc acrylate filler undergoes a free radical reaction to form ultrafine reinforcing particles dispersed in the rubber, thereby achieving a reinforcing effect. At the same time, the zinc acrylate filler can also undergo a cross-linking reaction with the rubber to form a network structure, while introducing high-bond-energy ions into the vulcanized rubber, thereby increasing the effective cross-linking density of the vulcanized rubber, reducing the content of weak bonds in the rubber, increasing the intermolecular forces, and increasing the comprehensive performance of the rubber. Furthermore, the zinc acrylate filler includes at least one of zinc monomethacrylate, zinc dimethacrylate, modified zinc diacrylate, and modified zinc dimethacrylate.

[0034] In some embodiments, the auxiliary cross-linking agent includes at least one of triallyl isocyanurate, triallyl cyanurate, and trimethylolpropane trimethacrylate.

[0035] Hydrogenated nitrile rubber has a very high degree of saturation and needs to be vulcanized using a peroxide vulcanization system. Side reactions such as molecular chain breakage are prone to occur during peroxide vulcanization. The addition of a crosslinking aid can increase the number of active bases in peroxide vulcanization and reduce the probability of side reactions to inhibit the breakage of the molecular chain, thereby increasing the degree of effective crosslinking reaction and further increasing the crosslinking density of the vulcanized rubber. The heat resistance, tensile tear strength and wear resistance of the vulcanized rubber can all be improved, and the compression deformation can also be significantly improved; at the same time, the crosslinking aid can also act as a plasticizer to improve the processability of the rubber. The above crosslinking aids can all increase the crosslinking density of hydrogenated nitrile rubber composites. The hydrogenated nitrile rubber composites with the addition of crosslinking aids have higher tensile strength, tear strength and elongation at break.

[0036] In some embodiments, the antioxidant includes at least one of 4,4'-dioctyldiphenylamine; 4,4'-diisooctyldiphenylamine, octylated diphenylamine, 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 2-mercaptomethylbenzimidazole zinc and 4.4'-bis(α.α-dimethylbenzyl)diphenylamine.

[0037] There are double bonds on the molecular bonds of hydrogenated nitrile rubber. Due to the activity of the double bonds, addition reactions or other chemical reactions are prone to occur. At the same time, due to the presence of double bonds, the hydrogen atoms on the α-methylene groups adjacent to the double bonds are particularly active and easily taken away by other substances, causing substitution reactions or forming large and small molecular free radicals. Therefore, hydrogenated nitrile rubber is easily attacked by oxygen and aged. Antiaging agents can effectively prevent hydrogenated nitrile rubber from thermal oxidation aging under high temperature conditions, but sometimes they will affect the cross-linking reaction of peroxides, reduce the cross-linking density of the material, and make the mechanical properties worse. Therefore, it is very important to select a suitable antioxidant and the amount of antioxidant to improve the comprehensive performance of hydrogenated nitrile rubber. The above-mentioned antioxidant contains a reactive NH functional group, which can react with the alkyl peroxide free radical ROO· in the auto-oxidation process, interrupt the chain reaction of the free radical, and change the auto-oxidation process of the vulcanized rubber.

[0038] In some embodiments, the acrylonitrile content of the hydrogenated nitrile rubber is 39% to 44%; the saturation of the hydrogenated nitrile rubber is 92% to 99%; and the raw rubber Mooney viscosity ML1+4 (100° C.) of the hydrogenated nitrile rubber is 60 to 100.

[0039] The performance of hydrogenated nitrile rubber will affect the comprehensive performance of the rubber used for downhole tools. When the acrylonitrile content, saturation and raw rubber Mooney viscosity ML1+4 (100°C) of the hydrogenated nitrile rubber are not within the scope of the present invention, the tensile strength, elongation at break and carbon dioxide corrosion resistance of the prepared rubber for downhole tools are significantly reduced.

[0040] Furthermore, the components of the carbon dioxide resistant rubber include, by weight: 95-105 parts of hydrogenated nitrile rubber, 60-70 parts of carbon black, 8-12 parts of filler, 4-5 parts of zinc chloride, 2-5 parts of cross-linking agent, 2-3.5 parts of antioxidant, 1-1.5 parts of stearic acid and 3.5-4.5 parts of dicumyl peroxide.

[0041] Furthermore, the components of the carbon dioxide resistant rubber include, by weight: 98 to 102 parts of hydrogenated nitrile rubber, 63 to 67 parts of carbon black, 9 to 11 parts of filler, 4 to 5 parts of zinc chloride, 3 to 5 parts of cross-linking agent, 2.5 to 3.5 parts of antioxidant, 1 to 1.2 parts of stearic acid and 3.5 to 4.5 parts of diisopropylbenzene peroxide.

[0042] Preferably, the weight proportion of hydrogenated nitrile rubber is 100 parts, the weight proportion of the auxiliary cross-linking agent is 5 parts, the weight proportion of the anti-aging agent is 3.5 parts, the weight proportion of zinc chloride is 5 parts, and the weight proportion of stearic acid is 1 part.

[0043] Based on a general inventive concept, an embodiment of the present application also provides an application of a carbon dioxide resistant rubber, wherein the rubber is the carbon dioxide resistant rubber described in the first aspect, and the application includes using the rubber for sealing in a carbon dioxide critical environment, wherein the temperature of the carbon dioxide critical environment is not less than 31.26°C, and the pressure of the carbon dioxide critical environment is not less than 72.9atm.

[0044] This application is realized based on the above-mentioned rubber. The specific content of the rubber can refer to the above-mentioned embodiment. Since this application adopts part or all of the technical solutions of the above-mentioned embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described one by one here.

[0045] Based on a general inventive concept, an embodiment of the present application further provides an application of a carbon dioxide resistant rubber, wherein the rubber is the carbon dioxide resistant rubber described in the first aspect, and the application includes using the rubber in downhole tools for oil and gas extraction.

[0046] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0047] In the following embodiments, the trade name of hydrogenated nitrile rubber is Therban 4307, the trade name of zinc monomethacrylate is SR709, the trade name of zinc dimethacrylate is SR708, the trade name of modified zinc diacrylate is Saret 633, the trade name of modified zinc dimethacrylate is Saret 634, and the trade name of carbon black is Carbon Black N220.

[0048] In the following embodiments, the auxiliary cross-linking agent is triallyl isocyanurate, and the antioxidant is 2-mercaptobenzimidazole and 2,2,4-trimethyl-1,2-dihydroquinoline polymer, wherein the 2-mercaptobenzimidazole is 2 parts by weight and the 2,2,4-trimethyl-1,2-dihydroquinoline polymer is 1.5 parts by weight.

[0049] Examples 1-5 and Comparative Examples 1-4

[0050] A method for preparing carbon dioxide resistant rubber, the method comprising:

[0051] The ingredients of the raw materials are obtained. The ingredients of each embodiment and comparative example are shown in Table 1:

[0052] Table 1

[0053]

[0054] Use an open mill to mix and prepare the rubber compound, turn on the cooling water, keep the roller temperature not higher than 50℃, plasticize the raw rubber on the open mill for several times, then add the methacrylic filler three times, mix evenly, add sodium stearate, zinc oxide, antioxidant, and carbon black in turn, mix evenly, pass it through three times, and finally add the vulcanizer, mix evenly, pass it through five times, and then cool it down and park it for 24 hours. The sample preparation is carried out in accordance with the relevant requirements of the national standard GB / T 529.

[0055] The samples provided in Examples 1 to 5 and Comparative Examples 1 to 4 were subjected to performance tests, including:

[0056] (1) Tear strength: GB / T 529 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped specimens);

[0057] (2) Tensile strength and elongation at break: GB / T 528 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber;

[0058] (3) Shore hardness: GB / T 531 Test method for indentation hardness of vulcanized rubber or thermoplastic rubber Part 1: Calculation method of Shore hardness (Shore hardness)

[0059] (4) Carbon dioxide corrosion resistance: "NACE TM 0187-2003 Evaluation of Elastomer Materials in Acidic Media", test conditions: pressure 35MPa, temperature 120℃, test period 168h, gas phase is pure CO2, liquid phase is distilled water.

[0060] The performance test results of the rubber are shown in Tables 2 and 3.

[0061] Table 2

[0062]

[0063] Table 3

[0064]

[0065]

[0066] It can be seen from the experimental data of Table 2 and Table 3 that the rubber of the present invention has excellent physical and mechanical properties, heat resistance and carbon dioxide corrosion resistance. Comparative Example 1 does not contain zinc acrylate filler, and the strength of the rubber is low, resulting in the rubber being penetrated and corroded by carbon dioxide, causing surface bubbles. In Comparative Example 2, carbon fiber is used as filler. Although the physical and mechanical properties of the rubber can be improved, the carbon fiber cannot react and crosslink with hydrogenated nitrile rubber during the vulcanization process like zinc acrylate filler to form a network structure and enhance the carbon dioxide corrosion resistance. Comparative Examples 3 and 4 show that when the amount of zinc acrylate filler is low, the network structure formed is not enough to resist the penetration of carbon dioxide; when the amount of zinc acrylate filler is high, the strength of the rubber is acceptable, but the hardness is high, and partial brittle cracks occur during the experiment. Moreover, after the amount of zinc acrylate filler is high, the processing technology of the rubber is also difficult, and the mixing process sticks to the roller and the molding process sticks to the mold.

[0067] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0068] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or plural, respectively.

[0069] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A carbon dioxide resistant rubber, characterized in that: The components of the carbon dioxide resistant rubber include, by weight: 90-110 parts of hydrogenated nitrile rubber, 50-80 parts of carbon black, 5-15 parts of filler, 3-6 parts of zinc chloride, 1-5 parts of cross-linking agent, 1.5-4 parts of antioxidant, 0.5-2 parts of stearic acid and 3-5 parts of diisopropylbenzene peroxide.

2. The carbon dioxide resistant rubber according to claim 1, characterized in that The components of the carbon dioxide resistant rubber include, by weight: 95-105 parts of hydrogenated nitrile rubber, 60-70 parts of carbon black, 8-12 parts of filler, 4-5 parts of zinc chloride, 2-5 parts of cross-linking agent, 2-3.5 parts of antioxidant, 1-1.5 parts of stearic acid and 3.5-4.5 parts of diisopropylbenzene peroxide.

3. The carbon dioxide resistant rubber according to claim 1, characterized in that The components of the carbon dioxide resistant rubber include, by weight: 98-102 parts of hydrogenated nitrile rubber, 63-67 parts of carbon black, 9-11 parts of filler, 4-5 parts of zinc chloride, 3-5 parts of cross-linking agent, 2.5-3.5 parts of antioxidant, 1-1.2 parts of stearic acid and 3.5-4.5 parts of diisopropylbenzene peroxide.

4. The carbon dioxide resistant rubber according to any one of claims 1 to 3, characterized in that The filler includes zinc acrylate filler.

5. The carbon dioxide resistant rubber according to claim 4, characterized in that The zinc acrylate filler includes at least one of zinc monomethacrylate, zinc dimethacrylate, modified zinc diacrylate and modified zinc dimethacrylate.

6. The carbon dioxide resistant rubber according to any one of claims 1 to 3, characterized in that The acrylonitrile content of the hydrogenated nitrile rubber is 39% to 44%; and / or The saturation degree of the hydrogenated nitrile rubber is 92% to 99%; and / or The raw Mooney viscosity of the hydrogenated nitrile rubber is 60-100.

7. The carbon dioxide resistant rubber according to any one of claims 1 to 3, characterized in that The auxiliary cross-linking agent includes at least one of triallyl isocyanurate, triallyl cyanurate and trimethylolpropane trimethacrylate.

8. The carbon dioxide resistant rubber according to any one of claims 1 to 3, characterized in that The antioxidant includes at least one of 4,4'-dioctyldiphenylamine, 4,4'-diisooctyldiphenylamine, octylated diphenylamine, 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 2-mercaptomethylbenzimidazole zinc and 4.4'-bis(α.α-dimethylbenzyl)diphenylamine.

9. An application of carbon dioxide resistant rubber, characterized in that: The rubber is the carbon dioxide resistant rubber according to any one of claims 1 to 8, and the application includes using the rubber for sealing in a carbon dioxide critical environment, the temperature of the carbon dioxide critical environment is not less than 31.26°C, and the pressure of the carbon dioxide critical environment is not less than 72.9atm.

10. An application of carbon dioxide resistant rubber, characterized in that: The rubber is the carbon dioxide resistant rubber according to any one of claims 1 to 8, and the application includes using the rubber in downhole tools for oil and gas production.

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