Sealing magnetic film and preparation method and application thereof

Abstract

The invention discloses a sealing magnetic film which comprises a polymer base material and magnetic particles. Wherein the polymer base material is formed by polymerizing 60-80 parts of butadiene and 20-40 parts of acrylonitrile, and the magnetic particles are one or two of iron powder and nickel powder. The invention also discloses preparation and application of the compound. The sealing magnetic suction film is particularly suitable for a floating disc sliding plate of oil gas storage equipment, automatic adsorption can be achieved, sealing can be formed, oil gas volatilization is effectively prevented, and environmental pollution is reduced. The sealing magnetic film provided by the invention can adapt to different oil and gas storage equipment and environmental conditions, has a wide application range, not only improves the safety of oil and gas storage, but also reduces the maintenance cost, has remarkable economic benefits and environmental protection values, and provides a brand new solution for the sealing technology.

Description

Technical Field

[0001] This invention relates to a sealing magnetic absorbing film, its preparation method, and its application. Background Technology

[0002] Piston seals are a new type of sealing device primarily used to prevent oil and gas leakage, ensuring the airtightness and safety of the storage environment. Due to the elastic properties of the materials and errors during installation, piston seals often leave gaps between the sealing surface and the sealing membrane after installation. For example, according to current technology, there may be a gap of approximately 1 mm between the installed sealing membrane and the sealing surface. These gaps significantly reduce sealing efficiency because oil and gas molecules can escape through them, leading to oil and gas evaporation and environmental pollution. Furthermore, over time, the sealing material may lose its original elasticity due to aging, wear, or environmental factors, further increasing the sealing gap and reducing sealing performance. This not only increases maintenance costs but may also lead to safety accidents, negatively impacting both the environment and the economy. Summary of the Invention

[0003] In view of the above problems, this invention is proposed to provide a high-efficiency sealing magnetic duct membrane that overcomes or at least partially solves the aforementioned problems. This high-efficiency sealing magnetic duct membrane, prepared using a special method, not only possesses excellent flexibility and mechanical strength, but also tightly adheres to the sealing surface after installation, effectively filling the gaps left by existing sealing technologies. This significantly improves the sealing efficiency of piston-type sealing technology and reduces environmental pollution. This invention provides a novel high-efficiency sealing magnetic duct membrane for improving the sealing performance of oil and gas storage equipment, reducing oil and gas volatilization, and lowering environmental pollution. This invention also provides a sealing method for oil and gas storage equipment that can significantly improve the sealing performance of oil and gas storage equipment.

[0004] As one aspect of the present invention, a sealing magnetic film is disclosed, comprising a polymer substrate and magnetic particles; wherein the polymer substrate is polymerized from 60-80 parts butadiene and 20-40 parts acrylonitrile, and the magnetic particles are one or both of iron powder and nickel powder.

[0005] In a feasible embodiment, the polymer substrate is polymerized from 65-70 parts butadiene and 20-30 parts acrylonitrile.

[0006] In a feasible embodiment, the polymer substrate is polymerized from 75-70 parts butadiene and 30-40 parts acrylonitrile.

[0007] In a feasible specific implementation, the iron powder has a particle size of 20-50 micrometers, and the nickel powder has a particle size of 10-30 micrometers.

[0008] In a feasible specific implementation, the magnetic particles are magnetic particles that have undergone surface silanization treatment.

[0009] As another aspect of the present invention, a method for preparing the above-described sealing magnetic film is provided, the method comprising:

[0010] (1) Mix 60-80 parts butadiene and 20-40 parts acrylonitrile, and keep them at a temperature of 80-100℃ and a pressure of 1-2MPa for 3-6 hours to obtain a polymer, which is used as a polymer base material.

[0011] (2) Screen iron powder with a particle size of 10-50 micrometers or nickel powder with a particle size of 10-30 micrometers as magnetic particles.

[0012] (3) After heating the polymer substrate to 110-130℃, magnetic particles are added and dispersed evenly to obtain a polymer substrate incorporating magnetic particles.

[0013] (4) Place the polymer substrate with magnetic particles in it into a mold and apply a pressure of 1.5-2 MPa to form a sealed magnetic film.

[0014] In a feasible specific implementation, in step (3), the mass of the magnetic particles is 5% of the mass of the polymer substrate.

[0015] In a feasible specific implementation, step (1) is as follows:

[0016] (1) Mix 60-75 parts butadiene and 20-30 parts acrylonitrile, and keep them at a temperature of 80-90℃ and a pressure of 1-2MPa for 3-6 hours to obtain a polymer, which is used as a polymer base material.

[0017] In a feasible specific implementation, the magnetic particles in step (2) are treated with a surface silane coupling agent.

[0018] In a feasible specific implementation, step (4) is carried out at 35°C.

[0019] In a feasible specific implementation, the method includes:

[0020] (1) Mix 75-80 parts butadiene and 30-40 parts acrylonitrile, and keep them at a temperature of 90-100℃ and a pressure of 1.0-2.0MPa for 4-6 hours to obtain a polymer, which is used as a polymer base material;

[0021] (2) Iron powder with a particle size of 20-30 micrometers and nickel powder with a particle size of 15-30 micrometers were screened as magnetic particles, and both were treated with surface silane coupling agent to obtain two types of magnetic particles.

[0022] (3) The polymer substrate is divided into two layers. Both layers are heated to 120-130℃ and held for 30 minutes. The first layer contains 1.5%-3.5% of the mass of the polymer substrate treated iron powder magnetic particles, and the second layer contains treated nickel powder magnetic particles, so that the total mass of the iron powder and nickel powder magnetic particles is 5% of the total mass of the polymer substrate. After being dispersed evenly, two layers of polymer substrates with different magnetic particles are obtained.

[0023] (4) Two layers of polymer substrates doped with different magnetic particles are stacked in sequence in a mold, and a pressure of 3.5-4.5 MPa is applied to form the film. The film is kept at 45°C for 10 hours to obtain a sealed magnetic film.

[0024] As another aspect of the present invention, the application of the above-mentioned sealing magnetic membrane in oil and gas storage equipment is related.

[0025] The sealing magnetic diaphragm provided by this invention possesses weak magnetism. While adhering tightly to the sealing surface, its inherent material strength ensures that it remains firmly attached to the sealing surface without deformation during the movement of the floating roof. This tight-fitting characteristic makes it difficult for oil and gas molecules to escape through the sealing gap, thereby significantly improving sealing efficiency.

[0026] The sealing magnetic membrane provided by this invention is particularly suitable for the floating roof slide plate of oil and gas storage equipment. During oil and gas storage, the floating roof slide plate is the main part where oil and gas come into contact with air, and traditional sealing technologies struggle to achieve a complete seal. By using the sealing magnetic membrane provided by this invention, it can automatically attract and form a seal, effectively preventing oil and gas evaporation and reducing environmental pollution.

[0027] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0028] 1. Improved sealing efficiency: The magnetic sealing film provided by this invention can automatically adsorb and closely fit the sealing surface of oil and gas storage equipment, effectively filling the gaps left by traditional sealing technology, thereby significantly improving sealing efficiency.

[0029] 2. Enhanced safety of oil and gas storage: Due to the tight adsorption characteristics of the sealing magnetic membrane provided by the present invention, the risk of oil and gas leakage is reduced, thereby improving the safety of oil and gas storage.

[0030] 3. Reduce environmental pollution: By reducing oil and gas volatilization, the sealing magnetic membrane provided by this invention helps to reduce the pollution of the environment by oil and gas.

[0031] 4. Reduced maintenance costs: Compared with traditional sealing materials, the magnetic sealing film provided by this invention has a longer service life and lower maintenance requirements, thereby reducing long-term operating costs.

[0032] 5. Excellent flexibility and mechanical strength: The sealing magnetic membrane provided by the present invention has excellent flexibility and mechanical strength, which ensures the stability and durability of the sealing magnetic membrane provided by the present invention in various environments.

[0033] 6. Easy to install and maintain: The sealing magnetic film provided by this invention has a simple installation process, is easy to operate, and is easy to maintain, reducing maintenance time and cost.

[0034] 7. High adaptability: The sealing magnetic membrane provided by this invention can adapt to different oil and gas storage equipment and environmental conditions, and has a wide range of applications.

[0035] 8. Environmentally friendly materials: The magnetic particles such as iron powder or nickel powder used in the sealing magnetic film provided by this invention, as well as the polymer substrate, can all be made of environmentally friendly materials to reduce the impact on the environment.

[0036] 9. Innovation: The design concept and implementation method of the sealing magnetic membrane provided by this invention are innovative, providing a brand-new solution for the sealing technology of oil and gas storage equipment.

[0037] 10. Economic benefits: Due to the improved sealing efficiency and reduced maintenance costs, the sealing magnetic diaphragm provided by this invention has significant economic benefits. Detailed Implementation

[0038] Unless otherwise stated, parts referred to in this application are parts by mass, and percentages are percentages by mass.

[0039] Example 1

[0040] Preparation of the sealing magnetic film:

[0041] (1) After mixing 70 parts butadiene and 35 parts acrylonitrile, the mixture was kept at 80°C and 1.2 MPa for 6 hours to obtain a polymer, which was used as a polymer base material.

[0042] (2) Screening iron powder with a particle size of 20-30 micrometers without surface treatment as magnetic particles.

[0043] (3) After heating the polymer substrate to 115°C and holding it for 30 minutes, add magnetic particles at a ratio of 5% of the polymer substrate mass. After dispersing evenly, a polymer substrate incorporating magnetic particles is obtained.

[0044] (4) Place the polymer substrate incorporating magnetic particles into a mold, apply a pressure of 2MPa to form it, and keep it at room temperature for 10 hours to obtain a sealed magnetic film.

[0045] Performance testing:

[0046] Flexibility test: The elongation of the sealed magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 200%.

[0047] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 13 MPa.

[0048] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 13 N / cm. 2 .

[0049] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.64%, which was 78% lower than the 12% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0050] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured in a high-temperature environment (60℃). The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 3.5%, which was 75% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0051] Example 2

[0052] Preparation of the sealing magnetic film:

[0053] (1) Mix 60 parts butadiene and 40 parts acrylonitrile and keep them at 85°C and 1.0 MPa for 5 hours to obtain a polymer, which is used as a polymer base material.

[0054] (2) Screening untreated nickel powder with a particle size of 10-30 micrometers as magnetic particles.

[0055] (3) After heating the polymer substrate to 110°C and holding it for 30 minutes, add magnetic particles at a ratio of 5% of the polymer substrate mass. After dispersing evenly, a polymer substrate incorporating magnetic particles is obtained.

[0056] (4) The polymer substrate with magnetic particles is placed in a mold and subjected to a pressure of 1.5 MPa for molding. It is kept at room temperature for 10 hours to obtain a sealed magnetic film.

[0057] Performance testing:

[0058] Flexibility test: The elongation of the sealed magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 220%.

[0059] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 16 MPa.

[0060] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 12 N / cm. 2 .

[0061] Sealing performance test at room temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at room temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested. The results showed that the oil and gas volatilization rate was 3%, which was 75% lower than the 12% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0062] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 3.92%, which was 72% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0063] Example 3

[0064] Preparation of the sealing magnetic film:

[0065] (1) Mix 65 parts butadiene and 30 parts acrylonitrile and keep them at 80°C and 1.5 MPa for 6 hours to obtain a polymer, which is used as a polymer base material.

[0066] (2) Screening iron powder with a particle size of 30-50 micrometers without surface treatment as magnetic particles.

[0067] (3) After heating the polymer substrate to 120°C and holding it for 30 minutes, add magnetic particles at a ratio of 5% of the polymer substrate mass. After dispersing evenly, a polymer substrate incorporating magnetic particles is obtained.

[0068] (4) Place the polymer substrate incorporating magnetic particles into a mold, apply a pressure of 2MPa to form it, and keep it at room temperature for 10 hours to obtain a sealed magnetic film.

[0069] Performance testing:

[0070] Flexibility test: The elongation of the sealed magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 200%.

[0071] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 15 MPa;

[0072] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 11 N / cm. 2 .

[0073] Sealing performance test at room temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at room temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested. The results showed that the oil and gas volatilization rate was 3%, which was 75% lower than the 12% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0074] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 3.92%, which was 72% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0075] Example 4

[0076] Preparation of the sealing magnetic film:

[0077] (1) After mixing 75 parts butadiene and 25 parts acrylonitrile, the mixture was kept at 85°C and 1.5 MPa for 4 hours to obtain a polymer, which was used as a polymer base material.

[0078] (2) Screen iron powder with a particle size of 15-20 micrometers and treat it with surface silane coupling agent. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (2% by mass) to an ethanol solution (ethanol:water = 95:5, volume ratio), add the screened iron powder, stir for 2 hours, and dry at 80°C for 4 hours to obtain the treated magnetic particles.

[0079] (3) After heating the polymer substrate to 115°C and holding it for 30 minutes, add 5% of the treated magnetic particles by mass of the polymer substrate. After dispersing evenly, the polymer substrate with magnetic particles is obtained.

[0080] (4) The polymer substrate with magnetic particles is placed in a mold, and a pressure of 3.5 MPa is applied to form the film. The film is then kept at 35°C for 10 hours to obtain a sealed magnetic film.

[0081] Performance testing:

[0082] Flexibility test: The elongation of the sealing magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 230%.

[0083] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 20 MPa.

[0084] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 18 N / cm. 2 .

[0085] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.04%, which was 83% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0086] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 3.08%, which was 78% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0087] Example 5

[0088] Preparation of the sealing magnetic film:

[0089] (1) After mixing 70 parts butadiene and 25 parts acrylonitrile, the mixture was kept at 80°C and 1.2 MPa for 6 hours to obtain a polymer, which was used as a polymer base material.

[0090] (2) Screen iron powder with a particle size of 20-30 micrometers and treat it with surface silane coupling agent. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (2% by mass) to an ethanol solution (ethanol:water = 95:5, volume ratio), add the screened iron powder, stir for 2 hours, and dry at 80°C for 4 hours to obtain the treated magnetic particles.

[0091] (3) After heating the polymer substrate to 120°C and holding it for 30 minutes, add 5% of the treated magnetic particles by mass of the polymer substrate. After dispersing evenly, the polymer substrate with magnetic particles is obtained.

[0092] (4) Place the polymer substrate incorporating magnetic particles into a mold, apply a pressure of 3MPa to form it, and keep it at 35°C for 10 hours to obtain a sealed magnetic film.

[0093] Performance testing:

[0094] Flexibility test: The elongation of the sealing magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 240%.

[0095] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 22 MPa.

[0096] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 15 N / cm. 2 .

[0097] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.16%, which was 82% lower than the 12% oil and gas volatilization rate of the traditional rubber sealing membrane.

[0098] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.94%, which was 79% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0099] Example 6

[0100] Preparation of the sealing magnetic film:

[0101] (1) Mix 65 parts butadiene and 20 parts acrylonitrile and keep at 90°C and 2MPa for 3 hours to obtain a polymer, which is used as a polymer base material.

[0102] (2) Screen nickel powder with a particle size of 25-30 micrometers and treat it with surface silane coupling agent. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (2% by mass) to an ethanol solution (ethanol:water = 95:5, volume ratio), add the screened nickel powder, stir for 2 hours, and dry at 80°C for 4 hours to obtain the treated magnetic particles.

[0103] (3) After heating the polymer substrate to 130°C and holding it for 30 minutes, add 5% of the treated magnetic particles by mass of the polymer substrate. After dispersing evenly, the polymer substrate with magnetic particles is obtained.

[0104] (4) Place the polymer substrate incorporating magnetic particles into a mold, apply a pressure of 4MPa to form it, and keep it at 35°C for 10 hours to obtain a sealed magnetic film.

[0105] Performance testing:

[0106] Flexibility test: The elongation of the sealing magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 240%.

[0107] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 20 MPa.

[0108] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 16 N / cm. 2 .

[0109] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.04%, which was 83% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0110] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.8%, which was 80% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0111] Example 7

[0112] Preparation of the sealing magnetic film:

[0113] (1) Mix 60 parts butadiene and 30 parts acrylonitrile and keep at 85°C and 1 MPa for 5 hours to obtain a polymer, which is used as a polymer base material.

[0114] (2) Screen nickel powder with a particle size of 15-25 micrometers and treat it with surface silane coupling agent. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (2% by mass) to an ethanol solution (ethanol:water = 95:5, volume ratio), add the screened nickel powder, stir for 2 hours, and dry at 80°C for 4 hours to obtain the treated magnetic particles.

[0115] (3) After heating the polymer substrate to 125°C and holding it for 30 minutes, add 5% of the mass of the polymer substrate treated magnetic particles. After dispersing evenly, the polymer substrate incorporating magnetic particles is obtained.

[0116] (4) The polymer substrate with magnetic particles is placed in a mold, and a pressure of 3.5 MPa is applied to form the film. The film is then kept at 35°C for 10 hours to obtain a sealed magnetic film.

[0117] Performance testing:

[0118] Flexibility test: The elongation of the sealing magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 250%.

[0119] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 23 MPa.

[0120] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 15 N / cm. 2 .

[0121] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.4%, which was 80% lower than the 12% oil and gas volatilization rate of the traditional rubber sealing membrane.

[0122] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 3.36%, which was 76% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0123] Example 8

[0124] Preparation of the sealing magnetic film:

[0125] (1) Mix 75 parts butadiene and 30 parts acrylonitrile and keep them at 90°C and 1.0 MPa for 5 hours to obtain a polymer, which is used as a polymer base material.

[0126] (2) Screen iron powder with a particle size of 20-25 micrometers and nickel powder with a particle size of 15-20 micrometers, and treat them with surface silane coupling agent respectively. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (mass ratio 2%) to ethanol solution (ethanol:water = 95:5, volume ratio), add the screened iron powder and nickel powder respectively, stir for 2 hours each, and dry at 80°C for 4 hours to obtain the two kinds of magnetic particles after treatment.

[0127] (3) The polymer substrate is divided into two layers. Both layers are heated to 125°C and held for 30 minutes. Then, 2.5% of the mass of the polymer substrate is added to the first layer with treated iron powder magnetic particles, and 2.5% of the mass of the polymer substrate is added to the second layer with treated nickel powder magnetic particles. After being dispersed evenly, two layers of polymer substrates with different magnetic particles are obtained.

[0128] (4) Two layers of polymer substrates doped with different magnetic particles are stacked in sequence in a mold, and a pressure of 3.5 MPa is applied to form the film. The film is kept at 45°C for 10 hours to obtain a sealed magnetic film.

[0129] Performance testing:

[0130] Flexibility test: The elongation of the sealing magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 260%.

[0131] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 22 MPa.

[0132] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 18 N / cm. 2 .

[0133] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 1.8%, which was 85% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0134] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.52%, which was 82% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0135] Example 9

[0136] Preparation of the sealing magnetic film:

[0137] (1) After mixing 78 parts butadiene and 35 parts acrylonitrile, the mixture was kept at 95°C and 1.5 MPa for 4 hours to obtain a polymer, which was used as a polymer base material.

[0138] (2) Screen iron powder with a particle size of 25-30 micrometers and nickel powder with a particle size of 15-25 micrometers, and treat them with surface silane coupling agent respectively. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (mass ratio 2%) to ethanol solution (ethanol:water = 95:5, volume ratio), add the screened iron powder and nickel powder respectively, stir for 2 hours each, and dry at 80°C for 4 hours to obtain the two kinds of magnetic particles after treatment.

[0139] (3) The polymer substrate is divided into two layers. Both layers are heated to 120°C and held for 30 minutes. Then, 1.5% of the mass of the polymer substrate is added to the first layer with treated iron magnetic particles and 3.5% of the mass of the polymer substrate is added to the second layer with treated nickel magnetic particles. After being dispersed evenly, two layers of polymer substrates with different magnetic particles are obtained.

[0140] (4) Two layers of polymer substrates doped with different magnetic particles are stacked in sequence in a mold, and a pressure of 4.0 MPa is applied to form the film. The film is kept at 45°C for 10 hours to obtain a sealed magnetic film.

[0141] Performance testing:

[0142] Flexibility test: The elongation of the sealed magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 280%.

[0143] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 25 MPa;

[0144] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 18 N / cm. 2 .

[0145] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 1.56%, which was 87% lower than the 12% oil and gas volatilization rate of the traditional rubber sealing membrane.

[0146] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 2.24%, which was 84% ​​lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0147] Example 10

[0148] Preparation of the sealing magnetic film:

[0149] (1) Mix 80 parts butadiene and 40 parts acrylonitrile and keep them at 100°C and 2.0 MPa for 6 hours to obtain a polymer, which is used as a polymer base material.

[0150] (2) Screen iron powder with a particle size of 20-30 micrometers and nickel powder with a particle size of 15-30 micrometers, and treat them with surface silane coupling agent respectively. The specific treatment process is as follows: add γ-aminopropyltriethoxysilane (mass ratio 2%) to ethanol solution (ethanol:water = 95:5, volume ratio), add the screened iron powder and nickel powder respectively, stir for 2 hours each, and dry at 80°C for 4 hours to obtain the two kinds of magnetic particles after treatment.

[0151] (3) The polymer substrate is divided into two layers. Both layers are heated to 130°C and held for 30 minutes. Then, 3.5% of the mass of the polymer substrate is added to the first layer with treated iron magnetic particles and 1.5% of the mass of the polymer substrate is added to the second layer with treated nickel magnetic particles. After being dispersed evenly, two layers of polymer substrates with different magnetic particles are obtained.

[0152] (4) Two layers of polymer substrates doped with different magnetic particles are stacked in sequence in a mold, and a pressure of 4.5 MPa is applied to form the film. The film is kept at 45°C for 10 hours to obtain a sealed magnetic film.

[0153] Performance testing:

[0154] Flexibility test: The elongation of the sealing magnetic film was tested using ISO 527-1 standard, and the results showed that the elongation was 270%.

[0155] Mechanical strength test: The tensile strength of the sealed magnetic film was tested using ASTM D638 standard, and the results showed that the tensile strength was 24 MPa.

[0156] Magnetic Adsorption Force Test: The adsorption force of the sealed magnetic film was tested at a distance of 5 mm. The results showed that the adsorption force was 20 N / cm. 2 .

[0157] Sealing performance test at ambient temperature: The sealing magnetic membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was less than 0.01mm, forming an effective seal. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 1.2%, which was 90% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0158] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was less than 0.01mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 1.96%, which was 86% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0159] Comparative Example 1

[0160] Preparation of the sealing membrane:

[0161] (1) Mix 65 parts butadiene and 35 parts acrylonitrile and keep them at 80°C and 1.2 MPa for 6 hours to obtain a polymer, which is used as a polymer base material.

[0162] (2) Place the polymer substrate in a mold, apply a pressure of 2.5 MPa to form the film, and keep it at room temperature for 10 hours to obtain a sealing film.

[0163] Performance testing:

[0164] Flexibility test: The elongation of the sealing film was tested using ISO 527-1 standard, and the results showed that the elongation was 190%.

[0165] Mechanical strength test: The tensile strength of the sealing membrane was tested using ASTM D638 standard, and the results showed that the tensile strength was 16 MPa.

[0166] Magnetic Adsorption Force Test: The adsorption force of the sealing film was tested at a distance of 5 mm, and the result showed that the adsorption force was 4 N / cm. 2 .

[0167] Sealing performance test at ambient temperature: The sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was 0.6mm. The oil and gas volatilization rate was tested. The results showed that the oil and gas volatilization rate was 5.76%, which was 52% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0168] High-temperature environment sealing performance test: The sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was 0.45mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 7.28%, which was 48% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0169] Comparative Example 2

[0170] Preparation of the sealing membrane:

[0171] (1) After mixing 70 parts butadiene and 30 parts acrylonitrile, the mixture was kept at 80°C and 1.2 MPa for 6 hours to obtain a polymer, which was used as a polymer base material.

[0172] (2) Place the polymer substrate in a mold, apply a pressure of 2.0 MPa to form the film, and keep it at room temperature for 10 hours to obtain a sealing film.

[0173] Performance testing:

[0174] Flexibility test: The elongation of the sealing film was tested using ISO 527-1 standard, and the results showed that the elongation was 180%.

[0175] Mechanical strength test: The tensile strength of the sealing membrane was tested using ASTM D638 standard, and the result showed that the tensile strength was 15 MPa.

[0176] Magnetic adsorption force test: The adsorption force of the sealing film was tested at a distance of 5 mm, and the result showed that the adsorption force was 6 N / cm. 2 .

[0177] Sealing performance test at ambient temperature: The sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was 0.4mm. The oil and gas volatilization rate was tested. The results showed that the oil and gas volatilization rate was 6.0%, which was 50% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0178] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the magnetic sealing membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was 0.35mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 7.7%, which was 45% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0179] Comparative Example 3

[0180] Preparation of the sealing membrane:

[0181] (1) Mix 75 parts butadiene and 25 parts acrylonitrile and keep them at 85°C and 1.5 MPa for 5 hours to obtain a polymer, which is used as a polymer base material.

[0182] (2) Place the polymer substrate in a mold, apply a pressure of 2.5 MPa to form the film, and keep it at room temperature for 10 hours to obtain a sealing film.

[0183] Performance testing:

[0184] Flexibility test: The elongation of the sealing film was tested using ISO 527-1 standard, and the results showed that the elongation was 190%.

[0185] Mechanical strength test: The tensile strength of the sealing membrane was tested using ASTM D638 standard, and the result showed that the tensile strength was 15 MPa.

[0186] Magnetic Adsorption Force Test: The adsorption force of the sealing film was tested at a distance of 5 mm, and the result showed that the adsorption force was 3 N / cm. 2 .

[0187] Sealing performance test at ambient temperature: The sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device. The sealing gap between the sealing surface of the floating roof slide plate and the sealing membrane was measured at ambient temperature (25℃). The results showed that the sealing gap was 0.8mm. The oil and gas volatilization rate was tested. The results showed that the oil and gas volatilization rate was 6.0%, which was 50% lower than the 12% oil and gas volatilization rate of traditional rubber sealing membranes.

[0188] High-temperature environment sealing performance test: The magnetic sealing membrane was installed on the floating roof slide plate of the external floating roof tank test device, and the sealing gap between the sealing surface of the floating roof slide plate and the sealing magnetic membrane was measured under high temperature (60℃) environment. The results showed that the sealing gap was 0.6mm. The oil and gas volatilization rate was tested, and the results showed that the oil and gas volatilization rate was 8.12%, which was 42% lower than the 14% oil and gas volatilization rate of the traditional rubber sealing membrane under the same test conditions.

[0189] As can be seen from the above examples and comparative examples, the sealing magnetic films prepared in Examples 1-10 have an elongation of over 200% and better flexibility compared to the sealing films prepared in Comparative Examples 1-3; a tensile strength of over 13 MPa and higher mechanical strength; and an adsorption force of 11 N / cm. 2 The above results in higher magnetic adsorption force; when installed on the floating roof sliding plate of oil and gas storage equipment, the sealing gap between the sealing surface of the floating roof sliding plate and the sealing magnetic film is less than 0.01mm, reducing the oil and gas volatilization rate by more than 75% at room temperature (25℃) and by more than 72% at high temperature (60℃), resulting in better sealing performance. The preparation method is summarized as follows:

[0190] (1) Mix 60-80 parts butadiene and 20-40 parts acrylonitrile, and keep them at a temperature of 80-100℃ and a pressure of 1-2MPa for 3-6 hours to obtain a polymer, which is used as a polymer base material.

[0191] (2) Screen iron powder with a particle size of 15-50 micrometers or nickel powder with a particle size of 10-30 micrometers as magnetic particles.

[0192] (3) After heating the polymer substrate to 110-130℃ and holding for 30 minutes, add magnetic particles at a ratio of 5% of the polymer substrate mass. After dispersing evenly, a polymer substrate incorporating magnetic particles is obtained.

[0193] (4) Place the polymer substrate with magnetic particles in it into a mold and apply a pressure of 1.5-4.5 MPa to form a sealed magnetic film.

[0194] Furthermore, the sealing magnetic films prepared in Examples 4-7 exhibit an elongation of over 230%, demonstrating better flexibility; a tensile strength exceeding 20 MPa, indicating higher mechanical strength; and an adsorption force reaching 15 N / cm. 2 The above results in higher magnetic adsorption force; when installed on the floating roof slide plate of oil and gas storage equipment, the oil and gas volatilization rate is reduced by more than 80% at room temperature (25℃) and by more than 76% at high temperature (60℃), resulting in better sealing performance. The preparation method is summarized as follows:

[0195] (1) Mix 60-75 parts butadiene and 20-30 parts acrylonitrile, and keep them at a temperature of 80-90℃ and a pressure of 1-2MPa for 3-6 hours to obtain a polymer, which is used as a polymer base material.

[0196] (2) Screen iron powder or nickel powder with a particle size of 15-30 micrometers and treat them with a surface silane coupling agent. The specific treatment process is as follows: Add γ-aminopropyltriethoxysilane (2% by mass) to an ethanol solution (ethanol:water = 95:5, volume ratio). Stir the screened iron or nickel magnetic particles for 2 hours and dry them at 80°C for 4 hours to obtain the treated magnetic particles.

[0197] (3) After heating the polymer substrate to 115-130℃ and holding for 30 minutes, add 5% of the treated magnetic particles by mass of the polymer substrate and disperse them evenly to obtain the polymer substrate doped with magnetic particles.

[0198] (4) Place the polymer substrate incorporating magnetic particles in a mold, apply pressure of 3-4 MPa to form it, and keep it at 35°C for 10 hours to obtain a sealed magnetic film.

[0199] Furthermore, the sealing magnetic films prepared in Examples 8-10, compared to the sealing magnetic films prepared in Examples 1-7 and Comparative Examples 1-3, exhibit superior mechanical strength and flexibility. The elongation of the sealing magnetic films reached over 260%, demonstrating better flexibility; the tensile strength reached over 22 MPa, indicating higher mechanical strength; and the adsorption force reached 18 N / cm. 2 The magnetic adsorption force is higher than described above. When installed on the floating roof slide plate of oil and gas storage equipment, it not only exhibits good sealing performance at room temperature, reducing oil and gas volatilization by more than 85%, but also achieves good sealing at a high temperature of 60℃, reducing oil and gas volatilization by more than 84%. Therefore, the sealing magnetic films prepared in Examples 8-10 have better sealing performance at high temperatures. The preparation method is summarized as follows:

[0200] (1) Mix 75-80 parts butadiene and 30-40 parts acrylonitrile, and keep them at a temperature of 90-100℃ and a pressure of 1.0-2.0MPa for 4-6 hours to obtain a polymer, which is used as a polymer base material;

[0201] (2) Iron powder with a particle size of 20-30 micrometers and nickel powder with a particle size of 15-30 micrometers were screened as magnetic particles. Both were treated with a surface silane coupling agent. The specific treatment process was as follows: γ-aminopropyltriethoxysilane (2% by mass) was added to an ethanol solution (ethanol:water = 95:5, volume ratio), and the screened iron powder and nickel powder magnetic particles were added respectively. They were stirred for 2 hours each and dried at 80°C for 4 hours to obtain the two types of magnetic particles after treatment.

[0202] (3) The polymer substrate is divided into two layers. Both layers are heated to 120-130℃ and held for 30 minutes. The first layer contains 1.5%-3.5% of the mass of the polymer substrate treated iron powder magnetic particles, and the second layer contains treated nickel powder magnetic particles, so that the total mass of the iron powder and nickel powder magnetic particles is 5% of the total mass of the polymer substrate. After being dispersed evenly, two layers of polymer substrates doped with different magnetic particles are obtained.

[0203] (4) Two layers of polymer substrates doped with different magnetic particles are stacked in sequence in a mold, and a pressure of 3.5-4.5 MPa is applied to form the film. The film is kept at 45°C for 10 hours to obtain a sealed magnetic film.

Claims

1. A sealed magnetic absorbing film, characterized in that, It includes a polymer substrate and magnetic particles; wherein the polymer substrate is polymerized from 60-80 parts butadiene and 20-40 parts acrylonitrile, and the magnetic particles are one or both of iron powder and nickel powder.

2. The sealing magnetic film according to claim 1, characterized in that, The polymer substrate is polymerized from 60-75 parts butadiene and 20-30 parts acrylonitrile.

3. The sealing magnetic film according to claim 1, characterized in that, The polymer substrate is polymerized from 75-80 parts butadiene and 30-40 parts acrylonitrile.

4. The sealing magnetic film according to claim 1, characterized in that, The iron powder has a particle size of 15-50 micrometers, and the nickel powder has a particle size of 10-30 micrometers.

5. The sealing magnetic absorbing film according to claim 1, characterized in that, The magnetic particles are magnetic particles that have undergone surface silanization treatment.

6. A method for preparing a sealing magnetic film, characterized in that, The method includes: (1) Mix 60-80 parts butadiene and 20-40 parts acrylonitrile, and keep them at a temperature of 80-100℃ and a pressure of 1-2MPa for 3-6 hours to obtain a polymer, which is used as a polymer base material. (2) Screen iron powder with a particle size of 15-50 micrometers or nickel powder with a particle size of 10-30 micrometers as magnetic particles. (3) After heating the polymer substrate to 110-130℃, magnetic particles are added and dispersed evenly to obtain a polymer substrate incorporating magnetic particles. (4) Place the polymer substrate with magnetic particles in it into a mold and apply a pressure of 1.5-4 MPa to form a sealed magnetic film.

7. The method according to claim 6, characterized in that, In step (3), the mass of the magnetic particles is 5% of the mass of the polymer substrate.

8. The method according to claim 6, characterized in that, Step (1) in the method is as follows: (1) Mix 60-75 parts butadiene and 20-30 parts acrylonitrile, and keep them at a temperature of 80-90℃ and a pressure of 1-2MPa for 3-6 hours to obtain a polymer, which is used as a polymer base material.

9. The method according to claim 6, characterized in that, The magnetic particles described in step (2) were treated with a surface silane coupling agent.

10. The method according to claim 6, characterized in that, Step (4) is performed at 35°C.

11. The method according to claim 6, characterized in that, The method includes: (1) Mix 75-80 parts butadiene and 30-40 parts acrylonitrile, and keep them at a temperature of 90-100℃ and a pressure of 1.0-2.0MPa for 4-6 hours to obtain a polymer, which is used as a polymer base material; (2) Iron powder with a particle size of 20-30 micrometers and nickel powder with a particle size of 15-30 micrometers were screened as magnetic particles, and both were treated with surface silane coupling agent to obtain two types of magnetic particles. (3) The polymer substrate is divided into two layers. Both layers are heated to 120-130℃ and held for 30 minutes. The first layer contains 1.5%-3.5% of the mass of the polymer substrate treated iron powder magnetic particles, and the second layer contains treated nickel powder magnetic particles, so that the total mass of the iron powder and nickel powder magnetic particles is 5% of the total mass of the polymer substrate. After being dispersed evenly, two layers of polymer substrates with different magnetic particles are obtained. (4) Two layers of polymer substrates doped with different magnetic particles are stacked in sequence in a mold, and a pressure of 3.5-4.5 MPa is applied to form the film. The film is kept at 45°C for 10 hours to obtain a sealed magnetic film.

12. The application of the sealing magnetic membrane according to any one of claims 1-5 or the sealing magnetic membrane prepared by any one of claims 6-11 in oil and gas storage equipment.