Polysulfone as well as preparation method and application thereof

Abstract

The invention relates to the technical field of macromolecules, and discloses polysulfone and a preparation method and application thereof.By introducing an electron-rich triphenylphosphine structure to a polysulfone side chain, the regularity of a molecular chain is destroyed, the flowability of a material is improved, the impact strength and flame retardance of the polysulfone are improved, and the application range of the material is greatly widened.

Description

Technical Field

[0001] This invention relates to the field of polymer technology, specifically to a polysulfone, its preparation method, and its applications. Background Technology

[0002] Polysulfone is an important thermoplastic engineering plastic, mainly including polyethersulfone (PES), bisphenol A polysulfone (PSU), and polyphenylene sulfone (PPSU). Polysulfone resins possess excellent mechanical properties, high-temperature resistance, chemical corrosion resistance, and aging resistance, making them widely used in numerous fields such as aerospace, defense, electronics, medical, nuclear power, oil wells, shipbuilding, magnetic wire, military industry, automotive manufacturing, and food processing.

[0003] However, the flame retardant properties of polysulfone are not ideal; according to the UL94 standard, general-purpose polysulfone only reaches the HB level. To improve the flame retardant properties of polysulfone, flame retardants are usually added during the material processing stage. Flame retardants are mainly divided into brominated flame retardants and phosphorus flame retardants. With increasingly stringent environmental protection requirements, traditional brominated flame retardants are gradually being phased out, and halogen-free flame retardants have become the main flame retardant method. Even though the use of halogen-free flame retardants improves the environmental protection level of materials, additives have disadvantages such as easy migration and poor compatibility. Furthermore, the processing temperature of polysulfone is above 300℃, and ordinary flame retardants are easily decomposed by heat, reducing material performance.

[0004] Existing technologies disclose phosphorus-containing flame-retardant engineering plastic polysulfone and its synthesis method. Specifically, it is a method for preparing flame-retardant polysulfone by introducing phosphorus-containing units into the molecular structure. Although this method overcomes the disadvantage of easy migration of traditional additive flame-retardant polysulfone, the phosphate ester groups introduced into the molecular backbone are easy to hydrolyze and break, which reduces the impact strength of the material and has low practical application value.

[0005] Therefore, how to improve the structure and preparation method of polysulfone in order to prepare polysulfone with good impact strength and flame retardancy is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] This invention provides a polysulfone to solve the problems of poor impact strength and poor flame retardancy of polysulfone in the prior art.

[0007] In a first aspect, the present invention provides a polysulfone having the structure shown in formula (I):

[0008] Formula (I) Where m is an integer from 2 to 5, n is an integer from 2 to 100; X is at least one of a single bond, a sulfoxide group, and an isopropylidene group.

[0009] In some alternative implementations, the ratio of m to n is 5-10:90-95.

[0010] In some alternative embodiments, the polysulfone has the following structure: .

[0011] In a second aspect, the present invention provides a method for preparing the polysulfone described in the first aspect, comprising the following steps: (1) Bisphenol salts are prepared by reacting organic bisphenol compounds, phosphorus-containing bisphenol compounds, and salt-forming agents; (2) Polysulfone was prepared by reacting dichlorodiphenyl sulfone compounds with bisphenol salts.

[0012] In some alternative embodiments, the phosphorus-containing bisphenol compound has the structure shown in formula (II):

[0013] Formula (II).

[0014] In some alternative embodiments, the organic bisphenol compound includes at least one of bisphenol A, bisphenol S, and 4,4′-biphenyl.

[0015] In some optional embodiments, the molar ratio of the phosphorus-containing bisphenol compound to the organic bisphenol compound is 5-10:90-95.

[0016] In some alternative embodiments, the dichlorodiphenyl sulfone compound includes 4,4′-dichlorodiphenyl sulfone.

[0017] In some alternative embodiments, the salt-forming agent includes at least one selected from lithium hydroxide, sodium hydroxide, potassium hydroxide, potassium amide, sodium amide, potassium hydride, and sodium hydride.

[0018] In some alternative implementations, in step (1), the reaction temperature is 80°C-110°C and the time is 1h-4h.

[0019] In some alternative implementations, in step (2), the reaction temperature is 100℃-190℃ and the time is 1h-6h.

[0020] Thirdly, the present invention provides the application of the polysulfone described in the first aspect or the polysulfone prepared by the preparation method described in the second aspect in mechanical equipment.

[0021] The technical solution of this invention has the following advantages: 1. The polysulfone provided by this invention, by introducing an electron-rich triphenylphosphine structure onto the side chain of polysulfone, disrupts the regularity of the molecular chain, improves the fluidity of the material, enhances the impact strength and flame retardancy of polysulfone, and greatly broadens the application range of the material.

[0022] 2. The polysulfone preparation method provided by the present invention, by adding phosphorus-containing bisphenol compounds, can improve the activity of the intermediate product bisphenol salt, thereby improving the reaction activity and shortening the reaction time. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is the 1H NMR spectrum of 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol prepared in this invention; Figure 2 This is the carbon NMR spectrum of 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol prepared in this invention; Figure 3 This is the 1H NMR spectrum of the polysulfone prepared in Example 1 of this invention; Figure 4 This is the carbon NMR spectrum of the polysulfone prepared in Example 1 of this invention. Detailed Implementation

[0025] The following embodiments are provided to better understand the present invention, but the following embodiments do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

[0026] Unless otherwise specified, all experimental steps or conditions in the examples were performed according to conventional experimental procedures and conditions in the art. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0027] To address the problems existing in the aforementioned related technologies, according to a first aspect of the present invention, the present invention provides a polysulfone having the structure shown in formula (I):

[0028] Formula (I) Where m is an integer from 2 to 5, n is an integer from 2 to 100; X is at least one of a single bond, a sulfoxide group, and an isopropylidene group.

[0029] In some alternative implementations, the ratio of m to n is 5-10:90-95.

[0030] For example, the ratio of m to n is 5:95, 6:94, 7:93, 8:92, 9:91 or 10:90.

[0031] In some alternative embodiments, the polysulfone has the following structure: .

[0032] Secondly, the present invention provides a method for preparing polysulfone, comprising the following steps: (1) Bisphenol salts are prepared by reacting bisphenol compounds, phosphorus-containing bisphenol compounds, and salt-forming agents; (2) Polysulfone was prepared by reacting dichlorodiphenyl sulfone compounds with bisphenol salts.

[0033] In some alternative embodiments, the bisphenol compound includes at least one of bisphenol A, bisphenol S, and 4,4′-biphenyl.

[0034] In some alternative embodiments, the phosphorus-containing bisphenol compound has the structure shown in formula (II):

[0035] Formula (II).

[0036] In some optional embodiments, the salt-forming agent includes at least one of lithium hydroxide, sodium hydroxide, potassium hydroxide, potassium amide, sodium amide, potassium hydride, and sodium hydride, preferably at least one of sodium hydroxide and potassium hydroxide.

[0037] Furthermore, the molar ratio of the phosphorus-containing bisphenol compound to the bisphenol compound is 5-10:90-95.

[0038] For example, the molar ratio of the phosphorus-containing bisphenol compound to the bisphenol compound is 5:95, 6:94, 7:93, 8:92, 9:91 or 10:90.

[0039] Furthermore, the molar ratio of the sum of the moles of the bisphenol compounds and the phosphorus-containing bisphenol compounds to the salt-forming agent is 1:2-2.1, preferably 1:2.02-2.06.

[0040] For example, the molar ratio of the sum of the moles of the bisphenol compound and the phosphorus-containing bisphenol compound to the salt-forming agent is 1:2, 1:2.01, 1:2.02, 1:2.03, 1:2.04, 1:2.05, 1:2.06, 1:2.07, 1:2.08, 1:2.09 or 1:2.1.

[0041] In some alternative embodiments, step (1) is carried out in a non-water-soluble hydrocarbon solvent.

[0042] Furthermore, the non-water-soluble hydrocarbon solvent includes at least one of C6-C20 aromatics, C6-C20 alkanes, C6-C20 cycloalkanes, butyl acetate, n-butyl ether, methyl cyclohexanone, and petroleum ether, preferably at least one of toluene, xylene, and ethylbenzene.

[0043] For example, the C6-C20 aromatics include toluene, o-xylene, p-xylene, m-xylene, ethylbenzene, or mesitylene.

[0044] For example, the C6-C20 alkanes include n-hexane, n-heptane, 2-methylpentane, or isooctane.

[0045] For example, the C6-C20 cycloalkanes include cyclohexane, methylcyclohexane, ethylcyclohexane, or decahydronaphthalene.

[0046] In some alternative implementations, in step (1), the reaction temperature is 80°C-110°C and the time is 1h-4h.

[0047] For example, the reaction temperature in step (1) is 80°C, 85°C, 90°C, 95°C, 100°C, 105°C or 110°C; and the time is 1h, 1.5h, 2h, 2.5h, 3h, 3.5h or 4h.

[0048] In some optional embodiments, after the reaction in step (1), the reaction temperature is increased to the azeotropic point of the solvent and deionized water, and the generated water is collected with a water separator while stirring. When the collected water reaches the theoretical value, the temperature is further increased until the hydrocarbon solvent is stably refluxed, and all hydrocarbon solvent is evaporated to obtain bisphenol salt powder.

[0049] In some alternative embodiments, the dichlorodiphenyl sulfone compound includes 4,4′-dichlorodiphenyl sulfone.

[0050] Further, the molar ratio of the bisphenol salt to the dichlorodiphenyl sulfone compound is 0.95-1.05:1, preferably 0.97-1.03:1.

[0051] For example, the molar ratio of the bisphenol salt to the dichlorodiphenyl sulfone compound is 0.95:1, 0.96:1, 0.97:1, 0.98:1, 0.99:1, 1:1, 1.01:1, 1.02:1, 1.03:1, 1.04:1, or 1.05:1.

[0052] In some alternative implementations, step (2) is performed in a nonprotic polar solvent.

[0053] Furthermore, the aprotic polar solvent includes at least one of N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, sulfolane, diphenyl sulfone, chloroform, dichloroethane, tetrahydrofuran, and 1,4-dioxane.

[0054] In some optional embodiments, step (2) further includes cooling the bisphenol salt prepared in step (1) to 50°C-100°C and then adding a dichlorodiphenyl sulfone compound to carry out the reaction.

[0055] In some alternative implementations, in step (2), the reaction temperature is 100℃-190℃ and the time is 1h-6h.

[0056] For example, in step (2), the temperature of the reaction is 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, or 190°C; and the time is 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h, 5h, 5.5h, or 6h.

[0057] In some optional embodiments, after the reaction of dichlorodiphenyl sulfone compounds and bisphenol salts is completed in step (2), the reaction product is rapidly cooled and then diluted to a solid content of 10%-30%, preferably 15%-25%.

[0058] For example, in step (2), after the reaction of dichlorodiphenyl sulfone compounds and bisphenol salts is completed, the reaction product is rapidly cooled and then diluted to a solid content of 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30%.

[0059] In this invention, the polysulfone mixture can be separated and purified using post-processing methods known to those skilled in the art. Specifically, the solution containing polysulfone should first be filtered to remove byproducts NaCl and / or KCl, as well as excess salt-forming agents. The polymer solid is precipitated in a precipitating agent, and after repeated boiling and washing, it is dried to obtain a polysulfone powder with high purity.

[0060] It should be noted that the preparation method of 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol (formula (II)) includes the following steps: (1) In a three-necked flask equipped with a mechanical stirrer, add 100 mL of hydrochloric acid (11.8 mol / L) and 100 mL of ice water, and add 0.5 mol of 2-diphenylphosphine dropwise while stirring. Then add 0.5 mol of sodium nitrite and control the temperature at 0-5℃ for 2 h. Filter to obtain 2-diphenylphosphine chlorodiazobenzene. (2) Add 1.5L of deionized water, 0.5mol of sodium bicarbonate and 0.23mol of p-benzoquinone to a three-necked flask, stir and add 0.25mol of 2-diphenylphosphine chlorodiazobenzene dropwise, react at room temperature for 3h, filter and obtain 2-triphenylphosphine p-benzodiquinone; (3) Add 0.1 mol of 2-triphenylphosphine-p-benzoquinone, 0.3 mol of zinc powder and 200 mL of water to the reaction system in sequence. Heat to 95 °C and then slowly add 70 mL of hydrochloric acid (11.8 mol / L). Keep the reaction at the temperature for 4 h. Filter the solution by hot suction. Cool the filtrate at 1-5 °C and let it stand for 2 h. Filter the solution by suction to obtain 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol.

[0061] Figure 1 The 1H NMR spectrum of the prepared 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol is shown below. Figure 2 The carbon NMR spectrum of 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol prepared in this embodiment is shown below. Figure 1 and Figure 2 As can be seen from the results, 2'-(diphenylphosphino)-[1,1'-biphenyl]-2,5-diol was successfully synthesized.

[0062] Thirdly, the present invention provides the application of the polysulfone described in the first aspect or the polysulfone prepared by the preparation method described in the second aspect in mechanical equipment.

[0063] In this invention, the notched impact strength of the cantilever beam is tested according to ISO 180.

[0064] Example 1 This embodiment provides a method for preparing polysulfone, including the following steps: (1) Place a four-necked flask equipped with a water separator, condenser and mechanical stirrer in an oil bath reactor, and add 300 mL of toluene, 0.01 mol of 2-triphenylphosphine hydroquinone, 0.19 mol of bisphenol A and 0.4 mol of solid sodium hydroxide in sequence. Heat to 80 °C and stir for 3 h to allow the system to form a salt. Then heat to 110 °C to reflux the toluene. While stirring, collect the generated water with a water separator. When the collected water reaches the theoretical value, evaporate the toluene. Stop heating and purge with nitrogen. Cool the system to 50 °C to obtain bisphenol salt. (2) 0.2 mol of 4,4′-dichlorodiphenyl sulfone and 546.18 g of N-methylpyrrolidone were added to the bisphenol salt system, purged with nitrogen, and rapidly heated to 190 °C. The reaction was carried out for 1 h to obtain a viscous solution. The viscous solution was rapidly cooled, diluted to 10% solids content, filtered to remove salt, and precipitated in water to obtain a white flocculent solid. After repeated boiling in water, filtration, and drying, pure polysulfone was obtained. The molecular weight (MW) was determined to be 6.2 × 10⁻⁶ by gel permeation chromatography (GPC). 4 The molecular weight distribution index (PDI) is 2.15; the melting temperature, measured by a capillary rheometer, is 255℃; the flame retardancy, measured by a horizontal and vertical combustion tester, reaches UL94 (3.2mm) V-0 level; and the notched impact strength of the cantilever beam is 65KJ / m. 2 .

[0065] Figure 3 This is the 1H NMR spectrum of the polysulfone prepared in this embodiment. Figure 4 The carbon NMR spectrum of the polysulfone prepared in this embodiment is shown below. Figure 3 and Figure 4 As can be seen, polysulfone was successfully synthesized.

[0066] Example 2 This embodiment provides a method for preparing polysulfone, including the following steps: (1) Place a four-necked flask equipped with a water separator, condenser and mechanical stirrer in an oil bath reactor, add 200 mL of o-xylene, 0.008 mol of 2-triphenylphosphine hydroquinone, 0.092 mol of bisphenol S and 0.21 mol of solid sodium hydroxide in sequence, heat to 110 °C and stir for 1 h to make the system fully salted, then heat to 150 °C to evaporate part of the o-xylene, collect the generated water with a water separator, when the collected water reaches the theoretical value, heat to 180 °C to completely evaporate the o-xylene, stop heating and purge with nitrogen, cool the system to 100 °C to obtain bisphenol salt; (2) 0.1 mol of 4,4′-dichlorodiphenyl sulfone and 634.24 g of N,N-dimethylformamide were added to the bisphenol salt system. The mixture was purged with nitrogen and kept at 140 °C for 5 h to obtain a viscous solution. The viscous solution was rapidly cooled, diluted to 10% solids content, filtered to remove salt, and precipitated in methanol to obtain a white powder. After repeated washing with methanol and water, filtration, and drying, pure polysulfone was obtained. The molecular weight (MW) was determined to be 5.9 × 10⁻⁶ by gel permeation chromatography (GPC). 4 The molecular weight distribution index (PDI) is 2.36; the melting temperature, measured by a capillary rheometer, is 248℃; the flame retardancy, measured by a horizontal and vertical combustion tester, reaches UL94 (3.2mm) V-0 level; and the notched impact strength of the cantilever beam is 70KJ / m. 2 .

[0067] Example 3 This embodiment provides a method for preparing polysulfone, including the following steps: (1) 1.5 L of ethylbenzene, 0.1 mol of 2-triphenylphosphine hydroquinone, 0.9 mol of 4,4′-biphenylhydroquinone and 2.05 mol of solid potassium hydroxide were added at once to a reactor equipped with a temperature control, stirring and reflux water separation device. The temperature was raised to 100 °C and reacted for 4 h to allow the system to form a salt. The temperature was then raised to 140 °C and the ethylbenzene was refluxed. The water generated was collected with the water separation device while stirring. When the collected water reached the theoretical value, the azeotropic agent ethylbenzene was evaporated. Heating was stopped and the system was purged with nitrogen. The system was cooled to 100 °C to obtain bisphenol salt. (2) 1 mol of 4,4′-dichlorodiphenyl sulfone and 1.49 kg of dimethyl sulfoxide were added to the bisphenol salt system, purged with nitrogen, and the temperature was maintained at 175 °C for 3 h to obtain a viscous solution. The viscous solution was rapidly cooled, diluted to 10% solid content, filtered to remove salt, and precipitated in ethanol to obtain a white powdery solid. After repeated washing with ethanol and water, filtration, and drying, pure polysulfone was obtained. The molecular weight (MW) was determined to be 6.8 × 10⁻⁶ by gel permeation chromatography (GPC). 4 The molecular weight distribution index (PDI) is 2.21; the melting temperature, measured by a capillary rheometer, is 245℃; the flame retardancy, measured by a horizontal and vertical combustion tester, reaches UL94 (3.2mm) V-0 level; and the notched impact strength of the cantilever beam is 73KJ / m. 2 .

[0068] Example 4 This embodiment provides a method for preparing polysulfone, including the following steps: (1) 6 L of o-xylene, 0.4 mol of 2-triphenylphosphine hydroquinone, 3.6 mol of bisphenol A and 8.4 mol of solid sodium hydroxide were added at once to a reactor equipped with a temperature control, stirring and reflux water separation device. The temperature was raised to 100℃ and reacted for 4 h to allow the system to form a salt. The temperature was then raised to 150℃ and the o-xylene was refluxed. The water generated was collected with the water separation device while stirring. When the collected water reached the theoretical value, the azeotropic agent o-xylene was evaporated. Heating was stopped and the system was purged with nitrogen. The system was cooled to 100℃ to obtain bisphenol salt. (2) 4 mol of 4,4′-dichlorodiphenyl sulfone and 10.92 kg of N,N-dimethylacetamide were added to a bisphenol salt system. The mixture was purged with nitrogen and kept at 160 °C for 6 h to obtain a viscous solution. The viscous solution was rapidly cooled, diluted to 10% solid content, filtered to remove salt, and precipitated in ethanol to obtain a white powdery solid. After repeated washing with ethanol and water, filtration, and drying, pure polysulfone was obtained. The molecular weight (MW) was determined to be 7.55 × 10⁻⁶ by gel permeation chromatography (GPC). 4 The molecular weight distribution index (PDI) is 2.52; the melting temperature, measured by a capillary rheometer, is 246℃; the flame retardancy, measured by a horizontal and vertical combustion tester, reaches UL94 (3.2mm) V-0 level; and the notched impact strength of the cantilever beam is 69KJ / m. 2 .

[0069] Comparative Example 1 This comparative example provides a method for preparing polysulfone, comprising the following steps: In a four-necked reaction flask equipped with an oil bath heater, stirrer, water separator, and condenser, 150 mL of o-xylene, 0.1 mol of bisphenol A, and 0.21 mol of sodium hydroxide were added sequentially. The mixture was heated to 100 °C and reacted for 4 h to ensure complete salt formation. The temperature was then raised to 150 °C and the o-xylene was refluxed. The generated water was collected using a water separator while stirring. When the collected water reached the theoretical value, the azeotropic agent o-xylene was evaporated to dryness. Heating was stopped and the system was purged with nitrogen. The system was cooled to 100 °C. 0.1 mol of 4,4'-dichlorodiphenyl sulfone and 177 g of N,N-dimethylacetamide were added to the system. The system was purged with nitrogen and the temperature was maintained at 160 °C for 6 h to obtain a yellow solution. The yellow solution was rapidly cooled, diluted to 10% solids content, filtered to remove salt, and precipitated in ethanol to obtain a white powdery solid. After repeated washing with ethanol and water, filtration, and drying, pure polysulfone was obtained. The molecular weight (MW) was determined to be 4.49 × 10⁻⁶ by gel permeation chromatography (GPC). 4 The molecular weight distribution index (PDI) is 2.58; the melting temperature, measured by a capillary rheometer, is 272℃; the flame retardancy, measured by a horizontal and vertical combustion tester, reaches UL94 (3.2mm) HB level; and the notched impact strength of the cantilever beam is 50KJ / m. 2This is because the absence of triphenylphosphine structure results in lower activity of the phenolate, leading to a slower reaction, more regular molecular chains, and poor flowability, resulting in poor impact strength of the prepared polysulfone; furthermore, the lack of phosphorus element in this comparative example leads to poor flame retardancy of the prepared polysulfone.

[0070] Comparative Example 2 This comparative example provides a method for preparing polysulfone, which is basically the same as the steps in Example 1, except that the addition of 2-triphenylphosphine hydroquinone is omitted, and the molar amount of bisphenol A is 0.2 mol. The molecular weight (MW) was determined to be 4 × 10⁻⁶ by gel permeation chromatography (GPC). 4 The molecular weight distribution index (PDI) is 3.41; the melting temperature, measured by a capillary rheometer, is 260℃; the flame retardancy, measured by a horizontal and vertical combustion tester, reaches UL94 (3.2mm) HB level; and the notched impact strength of the cantilever beam is 50KJ / m. 2 This is because Comparative Example 2 did not introduce a triphenylphosphine structure, resulting in lower activity of the phenolate, leading to a slower reaction, more regular molecular chains, and poor flowability, which in turn resulted in poorer impact strength of the prepared polysulfone; furthermore, the lack of phosphorus element in this comparative example resulted in poorer flame retardancy of the prepared polysulfone.

[0071] Comparative Example 3 This comparative example provides a method for preparing polysulfone, which is basically the same as the steps in Example 1, except that 2-triphenylphosphine hydroquinone is replaced with the same molar amount of bis(4-hydroxyphenyl)phenylphosphine oxide. A large number of polysulfone isomers were obtained, making purification impossible.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A polysulfone characterized in that, A polysulfone having a structure shown in formula (I): Formula (I) Wherein, m is an integer of 2-5, n is an integer of 2-100; X is at least one of a single bond, a sulfoxide group, and an isopropylidene group.

2. The polysulfone of claim 1, wherein, The ratio of the m and the n is 5-10:90-95.

3. The polysulfone of claim 1, wherein, The polysulfone has a structure as follows: 。 4. A process for the preparation of the polysulfone according to any one of claims 1 to 3, characterized in that, Comprising the following steps: (1) reacting an organic bisphenol compound, a phosphorus-containing bisphenol compound, and a salt-forming agent to prepare a bisphenol salt; (2) reacting a dichlorodiphenyl sulfone compound and the bisphenol salt to prepare the polysulfone.

5. The process for the preparation of a polysulfone according to claim 4, characterized in that, The phosphorus-containing bisphenol compound has a structure shown in formula (II): Formula (II).

6. The process for the preparation of a polysulfone according to claim 4, characterized in that, The organic bisphenol compound comprises at least one of bisphenol A, bisphenol S, and 4,4'-diphenol. And / or, the molar ratio of the phosphorus-containing bisphenol compound to the organic bisphenol compound is 5-10:90-95.

7. The process for the preparation of a polysulfone according to claim 4, characterized in that, The dichlorodiphenyl sulfone compound comprises 4,4'-dichlorodiphenyl sulfone.

8. The process for the preparation of a polysulfone according to claim 4, characterized in that, The salt-forming agent comprises at least one of lithium hydroxide, sodium hydroxide, potassium hydroxide, potassium amide, sodium amide, potassium hydride, and sodium hydride.

9. The method of preparing a polysulfone according to claim 4, wherein In step (1), the reaction temperature is 80-110°C, and the reaction time is 1-4h; And / or, in step (2), the reaction temperature is 100-190°C, and the reaction time is 1-6h.

10. Use of the polysulfone of any one of claims 1-3 or the polysulfone prepared by the preparation method of any one of claims 4-9 in a mechanical device.

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