Polysulfone resin and preparation method thereof

Abstract

The invention relates to polysulfone resin and a preparation method thereof. The structure of the polysulfone resin is shown as a formula (1), wherein n is more than 0 and less than 1. The polysulfone resin has a specific structure, bisphenol fluorene and bisphenol Z structures are creatively introduced into a traditional polysulfone resin structure, the glass transition temperature and light transmittance of the polysulfone resin can be improved at the same time, the polysulfone resin with high temperature resistance and high light transmittance is obtained, and therefore the application range of a polysulfone resin material can be further widened.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a polysulfone resin and a preparation method thereof. Background Art

[0002] Traditional polysulfone resin is mainly prepared by copolymerization of bisphenol A and 4,4-dichlorodiphenyl sulfone. It is an amber, transparent, non-crystalline special engineering plastic. Due to its excellent mechanical, high temperature resistance, hydrolysis resistance, radiation resistance and other properties, it is widely used in electrical and electronic, medical food industry, mechanical processing, automobile and visual windows. With the gradual increase in the demand for high temperature resistance and high transparency of polysulfone resin, its optical modification research such as heat resistance and light transmittance has received more and more attention.

[0003] Some technologies have greatly improved the heat resistance temperature of traditional polysulfone resin by introducing structures that can increase the glass transition temperature, but the impact on the optical properties of polysulfone resin, such as light transmittance, is questionable; other technologies have improved the light transmittance of polysulfone resin while maintaining the original properties of polysulfone resin by destroying the regularity of polymer chains, but the improvement of the heat resistance temperature of polysulfone resin is very limited. As a result, it is difficult to simultaneously improve the heat resistance temperature and light transmittance of polysulfone resin, which greatly limits the application of polysulfone resin materials.

[0004] Therefore, the traditional technology still needs to be further developed. Summary of the invention

[0005] Based on this, the present invention provides a polysulfone resin having both excellent high temperature resistance and high light transmittance and a preparation method thereof.

[0006] In a first aspect of the present invention, a polysulfone resin is provided, wherein the structure of the polysulfone resin is shown in formula (1):

[0007]

[0008] Among them, 0<n<1.

[0009] The above-mentioned polysulfone resin has a specific structure. The creative introduction of bisphenol fluorene and bisphenol Z structures into the traditional polysulfone resin structure can simultaneously improve the glass transition temperature and transmittance of the polysulfone resin, thereby obtaining a polysulfone resin with both high temperature resistance and high transmittance, thereby further broadening the application scope of the polysulfone resin material.

[0010] In some embodiments, the structure of the polysulfone resin is shown in formula (1-1):

[0011]

[0012] In some embodiments, 10%≤n≤70%; and / or

[0013] The number average molecular weight of the polysulfone resin is 90.0 kDa to 180.0 kDa.

[0014] By adjusting the content of specific structures, the glass transition temperature and light transmittance of polysulfone resin can be further significantly improved.

[0015] In some embodiments, the polysulfone resin has a glass transition temperature of 217° C. to 266° C.; and / or

[0016] The light transmittance of the polysulfone resin is 88.6% to 92.1%.

[0017] The second aspect of the present invention provides a method for preparing the polysulfone resin of the first aspect, comprising the following steps:

[0018] The monomer A, the monomer B and 4,4-difluorodiphenyl sulfone are subjected to polycondensation reaction to prepare the polysulfone resin as shown in formula (1);

[0019] Wherein, the structures of the monomer A and the monomer B are respectively as follows:

[0020]

[0021] In some embodiments, the molar ratio of the 4,4-difluorodiphenyl sulfone, the monomer A and the monomer B is (0.99-1.02): (0.5-0.9): (0.1-0.5); and / or

[0022] The monomer A is bisphenol Z; and / or

[0023] The monomer B is bisphenol fluorene.

[0024] In some embodiments, the polycondensation reaction is carried out under the action of a salt-forming agent, a reaction solvent and a water-carrying agent.

[0025] In some embodiments, the salt-forming agent comprises at least one of potassium carbonate and sodium carbonate; and / or

[0026] The molar ratio of the salt-forming agent to the 4,4-difluorodiphenyl sulfone is (1.3-1.6):1; and / or

[0027] The reaction solvent comprises at least one of N-methylpyrrolidone and sulfolane; and / or

[0028] The water-carrying agent comprises at least one of xylene and toluene; and / or

[0029] The weight of the water-carrying agent is 30% to 70% of the weight of the reaction solvent.

[0030] In some embodiments, the polycondensation reaction comprises a salt-forming reaction stage and a polymerization reaction stage, wherein the temperature of the salt-forming reaction stage is 160° C. to 200° C. and the time is 1.5 h to 3 h;

[0031] The temperature of the polymerization reaction stage is 180° C. to 220° C., and the time is 6 h to 12 h.

[0032] In some embodiments, after the polycondensation step, the following post-treatment step is also included:

[0033] Adding a diluent to the product of the polycondensation reaction to prepare a diluted product;

[0034] The diluted product is added dropwise to water for precipitation, and a crude polysulfone resin is obtained after filtering;

[0035] The crude polysulfone resin is dissolved in an organic solvent, then added dropwise to methanol for precipitation, and filtered to obtain a refined polysulfone resin;

[0036] The diluent includes at least one of N-methylpyrrolidone or sulfolane;

[0037] The organic solvent is at least one of N-N dimethylformamide, N-N dimethylacetamide, N-methylpyrrolidone or sulfolane. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below. Preferred embodiments of the present invention are provided in the specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0041] The terms "and / or", "or / and", and "and / or" used herein include any one of two or more related listed items, and also include any and all combinations of the related listed items, wherein the any and all combinations include any combination of two related listed items, any more related listed items, or all related listed items. It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that in the present application, the technical solution undoubtedly includes technical solutions connected by "logical and", and also undoubtedly includes technical solutions connected by "logical or".

[0042] In the present invention, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum value and the maximum value) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers in the numerical interval, including the two endpoint integers of the numerical range, and each integer between the two endpoints, is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical range disclosed herein should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows broadly including numerical interval types such as percentage intervals, ratio intervals, and ratio intervals.

[0043] The temperature parameters in the present invention, if not specifically limited, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, ±1°C are allowed. In the present invention, the term "room temperature" or "normal temperature" generally refers to 4°C to 35°C, for example, 20°C ±5°C.

[0044] In the present application, a single bond connected to a substituent runs through the corresponding ring, indicating that the substituent can be connected to any position of the ring, for example The hydroxyl group is connected to any substitutable position of the benzene ring.

[0045] An embodiment of the present invention provides a polysulfone resin, the structure of which is shown in formula (1):

[0046]

[0047] Among them, 0<n<1.

[0048] The above-mentioned polysulfone resin has a specific structure. The creative introduction of bisphenol fluorene and bisphenol Z structures into the traditional polysulfone resin structure can simultaneously improve the glass transition temperature and transmittance of the polysulfone resin, thereby obtaining a polysulfone resin with both high temperature resistance and high transmittance, thereby further broadening the application scope of the polysulfone resin material.

[0049] It can be understood that the structure shown in the above formula (1) mainly represents the basic structural units constituting the molecular chain of the polysulfone resin, but does not limit the arrangement of the basic structural units, which can be arranged randomly or orderly; specifically, the structure shown in formula (1) contains two basic structural units, namely, the basic structural units containing bisphenol fluorene structure and the basic structural units containing bisphenol Z structure, that is, based on the total molar number of the basic structural units contained, n represents the molar ratio of the basic structural units containing bisphenol fluorene structure, and (1-n) represents the molar ratio of the basic structural units containing bisphenol Z structure.

[0050] In some embodiments, the structure of the polysulfone resin is shown in formula (1-1):

[0051]

[0052] In some of these embodiments, 10%≤n≤70%.

[0053] By adjusting the content of specific structures, the glass transition temperature and light transmittance of polysulfone resin can be further significantly improved.

[0054] In some embodiments, the value of n includes: 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, and every value between the minimum and maximum values, or a range consisting of any two values.

[0055] In some embodiments, the number average molecular weight of the polysulfone resin is 90.0 kDa to 180.0 kDa.

[0056] In some of the embodiments, the polysulfone resin has a glass transition temperature of 217°C to 266°C.

[0057] In some of the embodiments, the light transmittance of the polysulfone resin is 88.6% to 92.1%.

[0058] Another embodiment of the present invention provides a method for preparing the polysulfone resin, comprising the following step S10.

[0059] Step S10: subjecting monomer A, monomer B and 4,4-difluorodiphenyl sulfone to a condensation polymerization reaction to prepare the polysulfone resin as shown in formula (1).

[0060] The structures of monomer A and monomer B are shown below:

[0061]

[0062] In some of the embodiments, the molar ratio of 4,4-difluorodiphenyl sulfone, monomer A and monomer B is (0.99-1.02):(0.4-0.9):(0.1-0.7).

[0063] In some of the embodiments, the molar ratio of 4,4-difluorodiphenyl sulfone, monomer A and monomer B is (0.99-1.02):(0.5-0.9):(0.1-0.5).

[0064] In some embodiments, monomer A is bisphenol Z (also known as 4,4′-cyclohexylidene bisphenol).

[0065] In some embodiments, monomer B is bisphenol fluorene (also known as 9,9-bis(4-hydroxyphenyl)fluorene).

[0066] In some of the embodiments, the polycondensation reaction is carried out under the action of a salt-forming agent, a reaction solvent and a water-carrying agent.

[0067] In some embodiments, the salt-forming agent includes at least one of potassium carbonate and sodium carbonate; further optionally, the salt-forming agent is potassium carbonate.

[0068] In some embodiments, the molar ratio of the salt-forming agent to 4,4-difluorodiphenyl sulfone is (1.3-1.6):1.

[0069] In some of the embodiments, the reaction solvent includes at least one of N-methylpyrrolidone and sulfolane; further optionally, the reaction solvent is sulfolane.

[0070] In some embodiments, the water-carrying agent includes at least one of xylene and toluene; further optionally, the water-carrying agent is xylene.

[0071] In some embodiments, the weight of the water-carrying agent is 30% to 70% of the weight of the reaction solvent.

[0072] In some of the embodiments, in the reaction system, based on the entire reaction system, the total solid content of monomer A, monomer B and 4,4-difluorodiphenyl sulfone is 20% to 50%, and can be further 25% to 35%.

[0073] In some of the embodiments, the condensation reaction includes a salt-forming reaction stage and a polymerization reaction stage, which are carried out sequentially. The temperature of the salt-forming reaction stage is 160°C to 200°C, and the time is 1.5h to 3h; the temperature of the polymerization reaction stage is 180°C to 220°C, and the time is 6h to 12h.

[0074] In some of the embodiments, after the polycondensation step, the following post-treatment steps S11 to S13 are further included.

[0075] S11: adding a diluent to the product of the polycondensation reaction to prepare a diluted product.

[0076] In some of the embodiments, the polycondensation product is cooled to 60° C. to 80° C. before the step of adding the diluent to the polycondensation product.

[0077] S12: adding the diluted product dropwise into water for precipitation, and filtering to obtain a crude polysulfone resin.

[0078] In some of the embodiments, the step of adding the diluted product dropwise into water for precipitation is performed under stirring conditions.

[0079] In some embodiments, the crude polysulfone resin obtained after filtration can be crushed into fine powder by a grinder, and repeatedly boiled with deionized water to remove residual salt and other water-soluble impurities, and finally dried to obtain crude polysulfone resin powder.

[0080] In some embodiments, the weight of water is 5 to 25 times the weight of the diluted product.

[0081] In some embodiments, the water is deionized water.

[0082] S13: The crude polysulfone resin is dissolved in an organic solvent, and then added dropwise to methanol for precipitation, and then filtered to obtain a refined polysulfone resin.

[0083] In some of the embodiments, the step of adding dropwise to methanol for precipitation is performed under stirring conditions.

[0084] In some embodiments, the diluent includes at least one of N-methylpyrrolidone or sulfolane.

[0085] In some embodiments, the organic solvent is at least one of N-dimethylformamide, N-dimethylacetamide, N-methylpyrrolidone or sulfolane.

[0086] In some of the embodiments, after the step of dropping into methanol for precipitation, the steps of crushing the precipitate with a crusher and then washing it with deionized water for multiple times are also included.

[0087] The present invention will be described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments. It should be understood that the attached claims summarize the scope of the present invention. Under the guidance of the concept of the present invention, those skilled in the art should realize that certain changes made to the various embodiments of the present invention will be covered by the spirit and scope of the claims of the present invention.

[0088] The following are specific embodiments.

[0089] Example 1

[0090] (1) Preparation of polysulfone resin, the specific steps are as follows:

[0091] 0.1 mol 4,4-difluorodiphenyl sulfone, 0.09 mol bisphenol Z, 0.01 mol bisphenol fluorene monomer, 140 g cyclobutane sulfone, 1.3 mol potassium carbonate, and 84 g xylene were added to a four-necked round-bottom flask, and then a mechanical stirring paddle, a condensing reflux tube, and a water separator were installed. Nitrogen was introduced, and the mixture was heated to 100°C while stirring for a period of time to completely dissolve the powder. The mixture was then heated to 180°C for a salt-forming reaction for 2 hours, and the xylene and water were evaporated. The mixture was heated to 200°C for a polymerization reaction for 8 hours to obtain a polymer slime.

[0092] After the polymer mucus is cooled to 80°C, cyclopentane is added to dilute and stir evenly to obtain a diluted product, and then the diluted product is gradually added dropwise into 10 times the weight of deionized water using a constant pressure dropping funnel, precipitated while stirring, then filtered and crushed into fine powder, and repeatedly boiled with deionized water to remove salt, filtered, and dried to obtain a crude polysulfone resin powder; then the crude polysulfone resin powder is dissolved in an organic solvent to form a solution, and the solution is dropped into methanol under stirring conditions using a constant pressure dropping funnel to obtain a precipitate, and after filtering, the precipitate is crushed with a grinder, and then boiled and washed with deionized water for multiple times to obtain a refined polysulfone resin product.

[0093] (2) Performance test, the specific steps are as follows:

[0094] The number average molecular weight of the refined polysulfone resin product was tested with reference to standard GB / T 21863-2008, the glass transition temperature of the refined polysulfone resin product was tested with reference to standard GB / T 19466.2-2004, and the light transmittance of the refined polysulfone resin product was tested with reference to standard GB / T 2410-2008.

[0095] The test results are shown in Table 1.

[0096] Example 2

[0097] (1) Preparation of polysulfone resin, the specific steps are as follows:

[0098] 0.1 mol 4,4-difluorodiphenyl sulfone, 0.05 mol bisphenol Z, 0.05 mol bisphenol fluorene monomer, 140 g cyclobutane sulfone, 1.3 mol potassium carbonate, and 84 g xylene were added to a four-necked round-bottom flask, and then a mechanical stirring paddle, a condensing reflux tube, and a water separator were installed. Nitrogen was introduced, and the mixture was heated to 100° C. while stirring for a period of time to completely dissolve the powder. The mixture was then heated to 180° C. for a salt-forming reaction for 2 h, and the xylene and water were evaporated. The mixture was heated to 200° C. for a polymerization reaction for 8 h to obtain a polymer slime.

[0099] After the polymer mucus is cooled to 80°C, cyclopentane is added to dilute and stir evenly to obtain a diluted product, and then the diluted product is gradually added dropwise into 10 times the weight of deionized water using a constant pressure dropping funnel, precipitated while stirring, then filtered and crushed into fine powder, and repeatedly boiled with deionized water to remove salt, filtered, and dried to obtain a crude polysulfone resin powder; then the crude polysulfone resin powder is dissolved in an organic solvent to form a solution, and the solution is dropped into methanol under stirring conditions using a constant pressure dropping funnel to obtain a precipitate, and after filtering, the precipitate is crushed with a grinder, and then boiled and washed with deionized water for multiple times to obtain a refined polysulfone resin product.

[0100] (2): Same as step (2) of Example 1. The test results are shown in Table 1.

[0101] Example 3

[0102] (1) Preparation of polysulfone resin, the specific steps are as follows:

[0103] 0.1 mol 4,4-difluorodiphenyl sulfone, 0.04 mol bisphenol Z, 0.06 mol bisphenol fluorene monomer, 140 g cyclobutane sulfone, 1.3 mol potassium carbonate, and 84 g xylene were added to a four-necked round-bottom flask, and then a mechanical stirring paddle, a condensing reflux tube, and a water separator were installed. Nitrogen was introduced, and the mixture was heated to 100° C. while stirring for a period of time to completely dissolve the powder. The mixture was then heated to 180° C. for a salt-forming reaction for 2 h, and the xylene and water were evaporated. The mixture was heated to 200° C. for a polymerization reaction for 8 h to obtain a polymer slime.

[0104] After the polymer mucus is cooled to 80°C, cyclopentane is added to dilute and stir evenly to obtain a diluted product, and then the diluted product is gradually added dropwise into 10 times the weight of deionized water using a constant pressure dropping funnel, precipitated while stirring, then filtered and crushed into fine powder, and repeatedly boiled with deionized water to remove salt, filtered, and dried to obtain a crude polysulfone resin powder; then the crude polysulfone resin powder is dissolved in an organic solvent to form a solution, and the solution is dropped into methanol under stirring conditions using a constant pressure dropping funnel to obtain a precipitate, and after filtering, the precipitate is crushed with a grinder, and then boiled and washed with deionized water for multiple times to obtain a refined polysulfone resin product.

[0105] (2): Same as step (2) of Example 1. The test results are shown in Table 1.

[0106] Example 4

[0107] (1) Preparation of polysulfone resin, the specific steps are as follows:

[0108] 0.1 mol 4,4-difluorodiphenyl sulfone, 0.03 mol bisphenol Z, 0.07 mol bisphenol fluorene monomer, 140 g cyclobutane sulfone, 1.3 mol potassium carbonate, and 84 g xylene were added to a four-necked round-bottom flask, and then a mechanical stirring paddle, a condensing reflux tube, and a water separator were installed. Nitrogen was introduced, and the mixture was heated to 100° C. while stirring for a period of time to completely dissolve the powder. The mixture was then heated to 180° C. for a salt-forming reaction for 2 h, and the xylene and water were evaporated. The mixture was heated to 200° C. for a polymerization reaction for 8 h to obtain a polymer slime.

[0109] After the polymer mucus is cooled to 80°C, cyclopentane is added to dilute and stir evenly to obtain a diluted product, and then the diluted product is gradually added dropwise into 10 times the weight of deionized water using a constant pressure dropping funnel, precipitated while stirring, then filtered and crushed into fine powder, and repeatedly boiled with deionized water to remove salt, filtered, and dried to obtain a crude polysulfone resin powder; then the crude polysulfone resin powder is dissolved in an organic solvent to form a solution, and the solution is dropped into methanol under stirring conditions using a constant pressure dropping funnel to obtain a precipitate, and after filtering, the precipitate is crushed with a grinder, and then boiled and washed with deionized water for multiple times to obtain a refined polysulfone resin product.

[0110] (2): Same as step (2) of Example 1. The test results are shown in Table 1.

[0111] Comparative Example 1

[0112] (1) Preparation of polysulfone resin, the specific steps are as follows:

[0113] 0.1 mol 4,4-difluorodiphenyl sulfone, 0.1 mol bisphenol A monomer, 140 g sulfolane, 1.3 mol potassium carbonate, and 84 g xylene were added to a four-necked round-bottom flask, and then a mechanical stirring paddle, a condensing reflux tube, and a water separator were installed. Nitrogen was introduced, and the mixture was heated to 100°C while stirring for a period of time to completely dissolve the powder. The mixture was then heated to 180°C for a salt-forming reaction for 2 hours, and the xylene and water were evaporated. The mixture was then heated to 200°C for a polymerization reaction for 8 hours to obtain a polymer slime.

[0114] After the polymer mucus is cooled to 80°C, cyclopentane is added to dilute and stir evenly to obtain a diluted product, and then the diluted product is gradually added dropwise into 10 times the weight of deionized water using a constant pressure dropping funnel, precipitated while stirring, then filtered and crushed into fine powder, and repeatedly boiled with deionized water to remove salt, filtered, and dried to obtain a crude polysulfone resin powder; then the crude polysulfone resin powder is dissolved in an organic solvent to form a solution, and the solution is dropped into methanol under stirring conditions using a constant pressure dropping funnel to obtain a precipitate, which is then filtered and crushed with a grinder, and then boiled and washed with deionized water for multiple times to obtain a refined polysulfone resin product.

[0115] (2): Same as step (2) of Example 1. The test results are shown in Table 1.

[0116] The performance test results of various embodiments and comparative examples are shown in Table 1.

[0117] Table 1

[0118] Number average molecular weight (kDa) Glass transition temperature(℃) Light transmittance (%) Example 1 95 217 92.1 Example 2 100 249 90.5 Example 3 150 258 88.6 Example 4 180 266 89.1 Comparative Example 1 92 190 87.5

[0119] By analyzing the data in Table 1 and comparing the performance test results of the polysulfone resins prepared in Examples 1 to 4 and Comparative Example 1, it can be seen that, compared with traditional polysulfone resins, the polysulfone resins with a specific structure provided in the present application have significantly improved glass transition temperature and light transmittance, and have both high temperature resistance and high light transmittance.

[0120] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0121] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A polysulfone resin, characterized in that The structure of the polysulfone resin is shown in formula (1): Among them, 0<n<1.

2. The polysulfone resin according to claim 1, characterized in that The structure of the polysulfone resin is shown in formula (1-1):

3. The polysulfone resin according to any one of claims 1 to 2, characterized in that 10% ≤ n ≤ 70%; and / or The number average molecular weight of the polysulfone resin is 90.0 kDa to 180.0 kDa.

4. The polysulfone resin according to any one of claims 1 to 2, characterized in that The glass transition temperature of the polysulfone resin is 217° C. to 266° C.; and / or The light transmittance of the polysulfone resin is 88.6% to 92.1%.

5. The method for preparing a polysulfone resin according to any one of claims 1 to 4, characterized in that: The steps include: The monomer A, the monomer B and 4,4-difluorodiphenyl sulfone are subjected to polycondensation reaction to prepare the polysulfone resin as shown in formula (1); Wherein, the structures of the monomer A and the monomer B are respectively as follows:

6. The method for preparing a polysulfone resin according to claim 5, characterized in that: The molar ratio of the 4,4-difluorodiphenyl sulfone, the monomer A and the monomer B is (0.99-1.02): (0.5-0.9): (0.1-0.5); and / or The monomer A is bisphenol Z; and / or The monomer B is bisphenol fluorene.

7. The method for preparing a polysulfone resin according to any one of claims 5 to 6, characterized in that: The polycondensation reaction is carried out under the action of a salt-forming agent, a reaction solvent and a water-carrying agent.

8. The method for preparing a polysulfone resin according to claim 7, wherein The salt-forming agent comprises at least one of potassium carbonate and sodium carbonate; and / or The molar ratio of the salt-forming agent to the 4,4-difluorodiphenyl sulfone is (1.3-1.6):1; and / or The reaction solvent comprises at least one of N-methylpyrrolidone and sulfolane; and / or The water-carrying agent comprises at least one of xylene and toluene; and / or The weight of the water-carrying agent is 30% to 70% of the weight of the reaction solvent.

9. The method for preparing a polysulfone resin according to any one of claims 5 to 6, characterized in that: The polycondensation reaction comprises a salt-forming reaction stage and a polymerization reaction stage, wherein the temperature of the salt-forming reaction stage is 160° C. to 200° C. and the time is 1.5 h to 3 h; The temperature of the polymerization reaction stage is 180° C. to 220° C., and the time is 6 h to 12 h.

10. The method for preparing a polysulfone resin according to any one of claims 5 to 6, characterized in that: After the polycondensation reaction step, the following post-treatment step is also included: Adding a diluent to the product of the polycondensation reaction to prepare a diluted product; The diluted product is added dropwise to water for precipitation, and a crude polysulfone resin is obtained after filtering; The crude polysulfone resin is dissolved in an organic solvent, then added dropwise to methanol for precipitation, and filtered to obtain a refined polysulfone resin; The diluent includes at least one of N-methylpyrrolidone or sulfolane; The organic solvent is at least one of N-N dimethylformamide, N-N dimethylacetamide, N-methylpyrrolidone or sulfolane.

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