Preparation and application of double modified nitrile latex

Abstract

The application discloses a preparation method of double-modified butyronitrile latex. The butyronitrile latex is subjected to hydrogenation and sulfonation double modification, the thermal stability and oil resistance of the butyronitrile latex are greatly improved, the comprehensive performance of the butyronitrile latex in a harsh environment is significantly improved, and the double-modified butyronitrile latex with high-temperature resistance and oil resistance is obtained. The double-modified butyronitrile latex prepared by the method can simultaneously consider the stability in high-temperature and high-oil environments, and can provide long-term stable sealing effect under complex working conditions such as oil and gas wellbore. The double-modified butyronitrile latex prepared by the method can significantly improve the reliability and application range of wellbore sealing materials, and is particularly suitable for wellbore plugging and sealing in oil and gas field development and pressure management operation of gas storage ring control.

Description

Technical Field

[0001] This invention relates to the preparation and application of a double-modified nitrile rubber latex. Background Technology

[0002] During oil and gas field development, the complex environment within the wellbore, including high temperature, high pressure, and oil-containing media, often places stringent requirements on the sealing materials used. Traditional nitrile rubber latex, due to its excellent oil resistance and good elasticity, is widely used in oil and gas well plugging and sealing operations. However, as the depth of oil and gas field extraction increases, the temperature and pressure within the wellbore rise sharply, and conventional nitrile rubber latex reveals many performance deficiencies under high temperature and high pressure environments.

[0003] First, insufficient temperature resistance is one of the main problems faced by existing nitrile rubber latexes. Under high-temperature environments, traditional nitrile rubber latexes are prone to thermal aging, leading to a rapid decline in the material's mechanical properties, weakened sealing performance, pressure leakage within the wellbore, and even safety hazards. Furthermore, the unsaturated double bonds in conventional nitrile rubber latexes are easily chemically degraded at high temperatures, failing to meet the long-term sealing requirements of deep well mining under high-temperature conditions.

[0004] Secondly, the limitations of nitrile rubber latex's oil resistance also restrict its application in oil and gas fields. Although nitrile rubber latex has good oil resistance, it will still swell and deform when exposed to oily media at high temperatures for extended periods, leading to sealant failure and compromising wellbore integrity. Traditional modified nitrile rubber latex often cannot simultaneously maintain stability in both high-temperature and highly oily environments, resulting in a high swelling rate that affects its sealing performance.

[0005] Furthermore, existing differential pressure activated sealants typically rely on changes in specific environmental pressure for seal activation. Traditional sealing materials are prone to failure under high differential pressure conditions due to insufficient material elasticity and strength. In particular, the combined effects of temperature and oily environments exacerbate the degradation of sealing materials, making it impossible to guarantee a durable and effective sealing effect.

[0006] To address these issues, researchers have attempted to improve the properties of nitrile butadiene latex through single modification methods, such as hydrogenation or sulfonation. However, while single modification methods excel in some properties, they exhibit limitations in others. For instance, although hydrogenated nitrile butadiene latex performs well in high-temperature resistance, its oil resistance is not significantly improved; while sulfonated nitrile butadiene latex, although exhibiting increased polarity and improved oil resistance, still suffers from insufficient temperature resistance and poor stability at high temperatures.

[0007] Therefore, there is an urgent need for a dual modification technology that can effectively improve the overall performance of nitrile rubber latex under high temperature, high pressure, and oily environments, especially enhancing its temperature resistance and oil resistance to meet the stringent requirements of sealing materials in oil and gas wellbores. By combining hydrogenation and sulfonation modification methods, it is possible to achieve a comprehensive improvement in the material's high temperature resistance and oil resistance, ensuring sealing performance under complex operating conditions. Summary of the Invention

[0008] The purpose of this invention is to provide a method for preparing a double-modified nitrile rubber latex and its application in differential pressure activated sealants, in order to solve the problem of existing sealing materials being prone to failure under high temperature, high pressure, and complex oily environments. Existing sealing materials, such as traditional nitrile rubber latex, while exhibiting good oil resistance and elasticity under normal temperature and low pressure conditions, show a significant decline in performance under high temperature and high pressure conditions, leading to seal failure and failing to meet the sealing requirements of deep well mining processes. Furthermore, the swelling problem of existing materials in oily media also greatly limits their service life.

[0009] This invention employs a dual modification process of hydrogenation and sulfonation to nitrile rubber latex, significantly enhancing its high-temperature resistance and pressure differential resistance while maintaining good oil resistance. This is particularly effective in complex operating conditions such as oil and gas wellbore environments, providing long-term, stable sealing. Hydrogenation modification improves thermal stability by eliminating unsaturated double bonds in the molecular structure, while sulfonation modification enhances oil resistance by introducing polar groups, thus significantly improving the overall performance of nitrile rubber latex in harsh environments.

[0010] Therefore, the objective of this invention is to improve the high-temperature resistance and oil resistance of the material, so that it can avoid swelling or performance degradation when in contact with oily media for a long time under high temperature, thus ensuring the sealing effect in the wellbore. Through the implementation of this invention, the reliability and applicability of wellbore sealing materials can be significantly improved, and it is particularly suitable for wellbore plugging and sealing in oil and gas field development, as well as pressurized treatment operations in gas storage facilities.

[0011] As one aspect of the present invention, a method for preparing dual-modified nitrile butadiene latex is provided, comprising:

[0012] (1) Add 1 to 5 parts of hydrogenation catalyst and stabilizer to 100 parts of nitrile latex, and carry out hydrogenation reaction in a hydrogen atmosphere at a temperature of 90℃ to 110℃ and a pressure of 0.8 MPa to 1.2 MPa to obtain hydrogenated nitrile latex.

[0013] (2) Add 2 to 5 parts of sulfonating agent to the hydrogenated nitrile latex obtained in step (1) and carry out sulfonation reaction at 30℃ to 60℃;

[0014] (3) Adjust the pH value to 6.8-7.2.

[0015] In a feasible specific embodiment, the above method for preparing dual-modified nitrile butadiene latex further includes:

[0016] (4) Washing removes impurities.

[0017] In a feasible specific implementation, step (1) is preferably:

[0018] (1) Add 2 to 5 parts of ruthenium carbon catalyst to 100 parts of nitrile latex, then add a stabilizer, and carry out a hydrogenation reaction in a hydrogen atmosphere at a temperature of 100℃ to 110℃ and a pressure of 1 MPa to 1.2 MPa to obtain hydrogenated nitrile latex.

[0019] In a feasible specific embodiment, the hydrogenation catalyst is a ruthenium-carbon catalyst; the sulfonation reagent is chlorosulfonic acid.

[0020] In a feasible specific embodiment, the stabilizer is an aqueous solution of sodium hydroxide with a concentration of 1.25-2.5 mol / L.

[0021] In a feasible specific implementation, step (3) uses an aqueous sodium hydroxide solution with a concentration of 7.5-12.5 mol / L to adjust the pH value.

[0022] In a feasible specific implementation, in step (4), impurities are removed by washing with one of toluene and dichloromethane or any combination thereof.

[0023] As another aspect of the present invention, it relates to a double-modified nitrile butadiene latex prepared using the above-described method.

[0024] As another aspect of the invention, a differential pressure activated sealant is provided, the differential pressure activated sealant comprising the above-mentioned dual-modified nitrile latex.

[0025] As another aspect of the present invention, the application of the above-mentioned differential pressure activated sealant in oil and gas field development is involved.

[0026] The method provided by this invention produces a double-modified nitrile rubber latex with excellent temperature resistance and superior oil resistance. Through double modification, the nitrile rubber latex maintains its physical and chemical stability even at high temperatures, ensuring that the sealant will not age or degrade in performance at temperatures above 100°C. When applied to differential pressure activated sealants, this invention makes the sealant more stable in long-term use in oily environments, reducing the need for frequent replacements. Detailed Implementation

[0027] In this application, unless otherwise stated, all parts are parts by weight.

[0028] The nitrile latex used in this embodiment of the invention is from Tianyuan Aviation Materials Technology Co., Ltd.

[0029] The ruthenium-carbon catalyst was obtained from Zhejiang Yamei Nanotechnology Co., Ltd.

[0030] Example 1:

[0031] As Example 1, nitrile latex was subjected to performance testing:

[0032] The high-temperature resistance of the nitrile latex in this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the nitrile latex in this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0033] Example 2:

[0034] Preparation of hydrogenated nitrile butadiene latex:

[0035] 100 parts of nitrile rubber latex were placed in a hydrogenation reactor, 0.5 parts of ruthenium carbon catalyst and 1 part of stabilizer were added, and the mixture was kept in a hydrogen atmosphere at 80°C and 0.7 MPa for 4 hours (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0036] The stabilizer is a sodium hydroxide aqueous solution with a concentration of 1.25 mol / L.

[0037] Performance testing:

[0038] The high-temperature resistance of the hydrogenated nitrile butadiene latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the hydrogenated nitrile butadiene latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0039] Example 3:

[0040] Preparation of hydrogenated nitrile butadiene latex:

[0041] 100 parts of nitrile rubber latex were placed in a hydrogenation reactor, 1 part of ruthenium carbon catalyst and 1 part of stabilizer were added, and the mixture was kept in a hydrogen atmosphere at 80℃ and 0.7 MPa for 4 hours (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0042] The stabilizer is a sodium hydroxide aqueous solution with a concentration of 1.25 mol / L.

[0043] Performance testing:

[0044] The high-temperature resistance of the hydrogenated nitrile butadiene latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the hydrogenated nitrile butadiene latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0045] Example 4:

[0046] Preparation of sulfonated nitrile butadiene latex:

[0047] Add 2 parts of chlorosulfonic acid to 100 parts of nitrile rubber latex and keep at 30°C for 2 hours (to carry out sulfonation reaction); add 30% sodium hydroxide aqueous solution to adjust the pH value to 7.0; wash with solvent to remove impurities and obtain sulfonated nitrile rubber latex.

[0048] The solvent is toluene.

[0049] Performance testing:

[0050] The high-temperature resistance of the sulfonated nitrile butadiene latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the sulfonated nitrile butadiene latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0051] Example 5:

[0052] Preparation of double-modified nitrile butadiene latex:

[0053] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 0.5 parts of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 80℃ and a pressure of 0.7 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0054] (2) Add 2 parts of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 30°C for 2 hours (to carry out sulfonation reaction); add a 10 mol / L sodium hydroxide aqueous solution to adjust the pH value to 7.0; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0055] The stabilizer is a 2 mol / L sodium hydroxide aqueous solution; the solvent is toluene.

[0056] Performance testing:

[0057] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0058] Example 6:

[0059] Preparation of double-modified nitrile butadiene latex:

[0060] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 1.5 parts of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 80℃ and a pressure of 0.7 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0061] (2) Add 1 part of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 30°C for 2 hours (to carry out sulfonation reaction); add 10 mol / L sodium hydroxide aqueous solution to adjust the pH value to 7.0; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0062] The stabilizer is a 2 mol / L sodium hydroxide aqueous solution; the solvent is toluene.

[0063] Performance testing:

[0064] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0065] Example 7:

[0066] Preparation of double-modified nitrile butadiene latex:

[0067] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 1 part of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 90℃ and a pressure of 0.8 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0068] (2) Add 3 parts of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 30°C for 2 hours (to carry out sulfonation reaction); add 10 mol / L sodium hydroxide aqueous solution to adjust the pH value to 7.2; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0069] The stabilizer is a 1.25 mol / L aqueous solution of sodium hydroxide; the solvent is dichloromethane.

[0070] Performance testing:

[0071] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0072] Example 8:

[0073] Preparation of double-modified nitrile butadiene latex:

[0074] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 2 parts of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 110℃ and a pressure of 0.8 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0075] (2) Add 4 parts of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 50°C for 2 hours (to carry out sulfonation reaction); add a 7.5 mol / L sodium hydroxide aqueous solution to adjust the pH value to 7.0; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0076] The stabilizer is a 1.25 mol / L aqueous solution of sodium hydroxide; the solvent is toluene.

[0077] Performance testing:

[0078] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0079] Example 9:

[0080] Preparation of double-modified nitrile butadiene latex:

[0081] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 2 parts of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 110℃ and a pressure of 1.2 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0082] (2) Add 2 parts of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 50°C for 2 hours (to carry out sulfonation reaction); add a sodium hydroxide aqueous solution with a concentration of 12.5 mol / L to adjust the pH value to 6.8; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0083] The stabilizer is a 1.25 mol / L aqueous solution of sodium hydroxide; the solvent is toluene.

[0084] Performance testing:

[0085] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0086] Example 10:

[0087] Preparation of double-modified nitrile butadiene latex:

[0088] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 2 parts of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 100℃ and a pressure of 1 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0089] (2) Add 4 parts of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 30°C for 2 hours (to carry out sulfonation reaction); add a 7.5 mol / L sodium hydroxide aqueous solution to adjust the pH value to 7.0; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0090] The stabilizer is a 2 mol / L aqueous solution of sodium hydroxide; the solvent is dichloromethane.

[0091] Performance testing:

[0092] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0093] Example 11:

[0094] Preparation of double-modified nitrile butadiene latex:

[0095] (1) Place 100 parts of nitrile rubber latex in a hydrogenation reactor, add 5 parts of ruthenium carbon catalyst and 1 part of stabilizer, and maintain for 4 hours under a hydrogen atmosphere at a temperature of 110℃ and a pressure of 1.2 MPa (to carry out the hydrogenation reaction) to obtain hydrogenated nitrile rubber latex.

[0096] (2) Add 5 parts of chlorosulfonic acid to the hydrogenated nitrile butadiene latex obtained in step (1) and keep it at 60°C for 2 hours (to carry out sulfonation reaction); add 10 mol / L sodium hydroxide aqueous solution to adjust the pH value to 7.2; wash with solvent to remove impurities and obtain sulfonated nitrile butadiene latex.

[0097] The stabilizer is a 2.5 mol / L aqueous solution of sodium hydroxide; the solvent is toluene.

[0098] Performance testing:

[0099] The high-temperature resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 3512-2014 "Accelerated Aging and Heat Resistance Tests of Vulcanized Rubber or Thermoplastic Rubber in Hot Air", and the results are shown in Table 1. The oil resistance of the double-modified nitrile rubber latex of this embodiment was tested according to the method in GB / T 1690-2010 "Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber", and the results are shown in Table 2.

[0100] Table 1. High Temperature Resistance Test Results

[0101]

[0102] Table 2 Results of oil resistance test

[0103]

[0104] As shown in Tables 1 and 2, compared with Example 1, after aging at 80℃ for 96 hours, the absolute value of the change rate of tensile strength in Examples 2-3 decreased from 55% to 48-50%, the absolute value of the change rate of elongation decreased from 60% to 52-55%, and the absolute value of the change in hardness decreased from 18 to 14-15, indicating that the temperature resistance was still poor. After soaking in white oil for 72 hours, the volume change rate decreased from 46% to 28-35%, the absolute value of the change rate of elongation decreased from 48% to 36-40%, and the absolute value of the change in hardness increased from 12 to 14, indicating that the oil resistance was improved.

[0105] After aging at 80°C for 96 hours, Example 4 showed an absolute change in tensile strength of 40%, an absolute change in elongation of 42%, and an absolute change in hardness of 9. After soaking in white oil for 72 hours, the volume change rate was 40%, the absolute change in elongation was 52%, and the absolute change in hardness was 10. Compared with Example 1, Example 4 showed a significant improvement in temperature resistance, but its oil resistance was still poor.

[0106] After aging at 80°C for 96 hours, Example 5 showed an absolute change in tensile strength of 38%, an absolute change in elongation of 40%, and an absolute change in hardness of 9. After immersion in white oil for 72 hours, the volume change rate was 40%, the absolute change in elongation was 43%, and the absolute change in hardness was 10. Compared with Example 4, the temperature resistance was similar, but the oil resistance was better. Compared with Example 1, both the temperature resistance and oil resistance were better. Compared with Examples 2-3, the temperature resistance was better, but the oil resistance was worse.

[0107] After aging at 80°C for 96 hours, Example 6 showed an absolute change in tensile strength of 21%, an absolute change in elongation of 17%, and an absolute change in hardness of 4. After soaking in white oil for 72 hours, the volume change rate was 30%, the absolute change in elongation of 40%, and the absolute change in hardness of 9. Compared with Examples 1-5, it showed better temperature resistance, but its oil resistance was worse than that of Example 3.

[0108] Examples 7-11, after aging at 80°C for 96 hours, showed an absolute change in tensile strength of 13-17%, an absolute change in elongation of 10-15%, and an absolute change in hardness of 2-3; after immersion in white oil for 72 hours, showed a volume change of 13-28%, an absolute change in elongation of 11-32%, and an absolute change in hardness of 2-5; compared with Examples 1-6, both temperature resistance and oil resistance were significantly enhanced.

[0109] In Examples 7-11, after aging at 80°C for 96 hours, the absolute value of the change rate of tensile strength was 13%, and the absolute value of the change rate of elongation was 10-11%; after aging at 100°C for 96 hours, the absolute value of the change rate of tensile strength was 13-14%, and the absolute value of the change rate of elongation was 11-12%; the temperature resistance was better.

[0110] The methods for preparing dual-modified nitrile butadiene latex in Examples 7-11 can be summarized as follows:

[0111] (1) Add 1 to 5 parts of hydrogenation catalyst and stabilizer to 100 parts of nitrile latex, and carry out hydrogenation reaction in a hydrogen atmosphere at a temperature of 90℃ to 110℃ and a pressure of 0.8 MPa to 1.2 MPa to obtain hydrogenated nitrile latex.

[0112] (2) Add 2 to 5 parts of sulfonating agent to the hydrogenated nitrile latex obtained in step (1) and carry out sulfonation reaction at 30℃ to 60℃;

[0113] (3) Adjust the pH value to 6.8-7.2.

[0114] The above method for preparing dual-modified nitrile butadiene latex further includes:

[0115] (4) Washing removes impurities.

[0116] Step (1) is preferably:

[0117] (1) Add 2 to 5 parts of ruthenium carbon catalyst to 100 parts of nitrile latex, then add a stabilizer, and carry out a hydrogenation reaction in a hydrogen atmosphere at a temperature of 100℃ to 110℃ and a pressure of 1 MPa to 1.2 MPa to obtain hydrogenated nitrile latex.

[0118] In the above method for preparing double-modified nitrile butadiene latex,

[0119] The hydrogenation catalyst is a ruthenium-carbon catalyst; the sulfonation reagent is chlorosulfonic acid;

[0120] The stabilizer is an aqueous solution of sodium hydroxide with a concentration of 1.25-2.5 mol / L;

[0121] In step (2), the pH is adjusted using an aqueous sodium hydroxide solution with a concentration of 7.5-12.5 mol / L;

[0122] In step (4), impurities are removed by washing with one of toluene and dichloromethane or any combination thereof.

Claims

1. Process for the preparation of a double modified nitrile latex, characterized in that, include: (1) Add 1 to 5 parts of hydrogenation catalyst and stabilizer to 100 parts of nitrile latex, and carry out hydrogenation reaction in a hydrogen atmosphere at a temperature of 90℃ to 110℃ and a pressure of 0.8 MPa to 1.2 MPa to obtain hydrogenated nitrile latex. (2) Add 2 to 5 parts of sulfonating agent to the hydrogenated nitrile latex obtained in step (1) and carry out sulfonation reaction at 30℃ to 60℃; (3) Adjust the pH value to 6.8-7.

2.

2. The method of claim 1, wherein, The method for preparing dual-modified nitrile butadiene latex further includes: (4) Washing removes impurities.

3. The method of any of claims 1-2, wherein, Step (1) is as follows: (1) Add 2 to 5 parts of ruthenium carbon catalyst to 100 parts of nitrile latex, then add a stabilizer, and carry out a hydrogenation reaction in a hydrogen atmosphere at a temperature of 100℃ to 110℃ and a pressure of 1 MPa to 1.2 MPa to obtain hydrogenated nitrile latex.

4. The method of any of claims 1-2, wherein, The hydrogenation catalyst is a ruthenium-carbon catalyst; the sulfonation reagent is chlorosulfonic acid.

5. The method according to any one of claims 1-2, characterized in that, The stabilizer is an aqueous solution of sodium hydroxide with a concentration of 1.25-2.5 mol / L.

6. The method according to any one of claims 1-2, characterized in that, Step (3) Use a sodium hydroxide aqueous solution with a concentration of 7.5-12.5 mol / L to adjust the pH value.

7. The method according to claim 2, characterized in that, In step (4), impurities are removed by washing with one of toluene and dichloromethane or any combination thereof.

8. A double-modified nitrile butadiene latex, characterized in that, The modified nitrile latex is prepared using any one of the methods described in claims 1-7.

9. A differential pressure activated sealant, characterized in that, The differential pressure activated sealant comprises the dual-modified nitrile latex of claim 8.

10. The application of differential pressure activating sealant in oil and gas field development, characterized in that, The differential pressure activated sealant is the differential pressure activated sealant as described in claim 9.

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