Polysulfone resin and production process thereof

Abstract

The invention relates to the technical field of polysulfone resin production, and discloses polysulfone resin and a production process thereof. The polysulfone resin production process comprises the following steps: preparing a polysulfone resin solution, and carrying out solid-liquid separation on the polysulfone resin solution to prepare a filtered polysulfone resin solution; steam is sprayed into the precipitation drying kettle at the pressure not lower than 0.5 MPa, so that a flowing high-pressure steam environment is formed in the kettle; spraying the filtered polysulfone resin solution into flowing high-pressure steam in a mist form, so that a solvent in the polysulfone resin solution is gasified to form solvent gas and discharged along with the steam, and polysulfone resin is solidified and separated out in a particle form; and drying the separated polysulfone resin particles to obtain the polysulfone resin. According to the technical scheme provided by the invention, the production efficiency of the polysulfone resin can be improved, and the purity of the prepared polysulfone resin can be improved.

Description

Technical Field

[0001] The invention relates to the field of polysulfone resin production, in particular to a polysulfone resin and a production process thereof. Background Art

[0002] Bisphenol A polysulfone resin has many excellent properties such as high molecular stability, transparency, hydrolysis stability, chemical resistance, and biocompatibility. It can be widely used in aerospace, electronics, medical equipment, and automotive parts.

[0003] Bisphenol A type polysulfone resin uses bisphenol A and 4,4'-dichlorodiphenyl sulfone as raw materials, forms a viscous solution through polycondensation reaction, mixes the viscous solution with a precipitant (such as water, methanol, or ethanol) to precipitate the polysulfone resin, and then grinds the precipitated polysulfone resin solid, washes and dries it to obtain the polysulfone resin. The existing production process of polysulfone resin is complicated, the production efficiency is low, and the purity of the obtained polysulfone resin is low. Summary of the invention

[0004] The main purpose of the present invention is to provide a polysulfone resin and a production process thereof, aiming to solve the problems of low production efficiency of polysulfone resin and low purity of the prepared polysulfone resin in the prior art.

[0005] To achieve the above object, the present invention provides a polysulfone resin production process, comprising the following steps:

[0006] S10, preparing a polysulfone resin solution, and performing solid-liquid separation on the polysulfone resin solution to obtain a filtered polysulfone resin solution;

[0007] S20, spraying steam into the precipitation drying kettle at a pressure of not less than 0.5 MPa, so that a flowing high-pressure steam environment is formed in the kettle;

[0008] S30, spraying the filtered polysulfone resin solution obtained in step S10 into flowing high-pressure steam in the form of mist, so that the solvent in the polysulfone resin solution is vaporized to form solvent gas and discharged with the steam, while the polysulfone resin is solidified and precipitated in the form of particles;

[0009] S40, drying the polysulfone resin particles precipitated in step S30 to obtain the polysulfone resin.

[0010] Optionally, in step S30, the filtered polysulfone resin solution is sprayed out at a pressure of 0.15-0.40 MPa.

[0011] Optionally, in step S30, the filtered polysulfone resin solution is sprayed out through a spray hole with a pore size of 0.5 to 2.0 mm.

[0012] Optionally, in the step S30, the filtered polysulfone resin solution is sprayed out through a rotating nozzle, and the rotation speed of the nozzle is 200-800 rpm.

[0013] Optionally, in step S20, steam is sprayed out at a pressure of 0.5-1.0 MPa.

[0014] Optionally, in step S40, the temperature during the drying process is 120-150° C., and the drying process is accompanied by stirring.

[0015] Optionally, in step S10, the polysulfone resin solution is filtered to separate solid from liquid.

[0016] The present invention also provides a polysulfone resin, which is prepared by a polysulfone resin production process, wherein the polysulfone resin production process comprises the following steps:

[0017] S10, preparing a polysulfone resin solution, and performing solid-liquid separation on the polysulfone resin solution to obtain a filtered polysulfone resin solution;

[0018] S20, spraying steam into the precipitation drying kettle at a pressure of not less than 0.5 MPa, so that a flowing high-pressure steam environment is formed in the kettle;

[0019] S30, spraying the filtered polysulfone resin solution obtained in step S10 into flowing high-pressure steam in the form of mist, so that the solvent in the polysulfone resin solution is vaporized to form solvent gas and discharged with the steam, while the polysulfone resin is solidified and precipitated in the form of particles;

[0020] S40, drying the polysulfone resin particles precipitated in step S30 to obtain the polysulfone resin.

[0021] In the technical scheme of the present invention, the polysulfone resin solution formed by the polymerization reaction is subjected to solid-liquid separation to remove byproducts such as solid salts in the polysulfone resin solution, which helps to improve the purity of the obtained polysulfone resin product. The high-pressure steam input device inputs high-pressure water vapor into the precipitation drying kettle, so that the temperature in the precipitation drying kettle is higher than the boiling point of the solvent in the raw material for preparing the polysulfone resin. The spray device sprays the filtered polysulfone resin solution into the precipitation drying kettle in a mist form, and the mist liquid entering the precipitation drying kettle contacts with the high-pressure steam. Since the temperature in the precipitation drying kettle is higher than the boiling point of the solvent in the raw material for preparing the polysulfone resin, the solvent in the mist liquid can be quickly vaporized to form solvent gas. After the solvent in the mist liquid is removed, the polysulfone resin can be solidified and precipitated and sink to the bottom of the precipitation drying kettle. And the mist liquid contacts with the high-pressure steam, which can ensure that the particle size of the precipitated polysulfone resin particles is small, avoids the steps of crushing and washing, improves production efficiency, and removes byproducts such as solid salts, and removes the solvent, improves the purity of the product.

[0022] After the precipitation of the polysulfone resin is completed, the drying device can directly dry the precipitated polysulfone resin particles. Since the precipitation and drying of the polysulfone resin particles are completed in the precipitation drying kettle, there is no need to set up a separate drying device, which avoids the transfer of materials, and there is no need for crushing and washing steps before drying, which simplifies the production process, further improves the production efficiency of the polysulfone resin, and saves water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the process structure of a polysulfone resin production process provided by the present invention;

[0025] Figure 2 The present invention provides a schematic structural diagram of the polysulfone resin production equipment.

[0026] Description of Figure Numbers:

[0027] 1. Coagulation and drying kettle; 11. First installation port; 12. Second installation port; 13. Exhaust port; 131. Filter screen; 132. First exhaust pipe; 132a. First valve; 133. Second exhaust pipe; 133a. Second valve; 14. Discharge port; 21. Feed pipe; 22. First pressure pump; 23. Third valve; 24. Nozzle; 31. Inlet pipe; 32. Steam controller; 33. Fourth valve; 34. Steam distributor; 51. First jacket; 511. Steam inlet; 512. Steam outlet; 52. Stirring device.

[0028] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Bisphenol A type polysulfone resin uses bisphenol A and 4,4'-dichlorodiphenyl sulfone as raw materials, forms a viscous solution through polycondensation reaction, mixes the viscous solution with a precipitant (such as water, methanol, or ethanol) to precipitate the polysulfone resin, and then grinds the precipitated polysulfone resin solid, washes and dries it to obtain the polysulfone resin. The existing production process of polysulfone resin is complicated, the production efficiency is low, and the purity of the obtained polysulfone resin is low.

[0033] In view of this, the present invention proposes a polysulfone resin production process, aiming to solve the problems of low production efficiency of existing polysulfone resins and low purity of the prepared polysulfone resins.

[0034] See also Figure 1 to Figure 2 The polysulfone resin production process comprises the following steps:

[0035] S10, preparing a polysulfone resin solution, and performing solid-liquid separation on the polysulfone resin solution to obtain a filtered polysulfone resin solution;

[0036] S20, spraying steam into the precipitation drying kettle 1 at a pressure not less than 0.5 MPa, so that a flowing high-pressure steam environment is formed in the kettle;

[0037] S30, spraying the filtered polysulfone resin solution obtained in step S10 into flowing high-pressure steam in the form of mist, so that the solvent in the polysulfone resin solution is vaporized to form solvent gas and discharged with the steam, while the polysulfone resin is solidified and precipitated in the form of particles;

[0038] S40, drying the polysulfone resin particles precipitated in step S30 to obtain the polysulfone resin.

[0039] In the technical solution of the present invention, in step S10, the raw materials for preparing bisphenol A type polysulfone resin (bisphenol A, 4,4'-dichlorodiphenyl sulfone, catalyst, and organic solvent, etc.) are put into a reactor, and a viscous solution is formed through a polycondensation reaction, and an organic solvent is injected into the reactor to dilute the viscous solution after the reaction to form a polysulfone resin solution. The organic solvent used to dilute the viscous solution is the same as the organic solvent in the raw materials for preparing bisphenol A type polysulfone resin, and during dilution, the amount of the organic solvent used is 0.5 to 3.0 wt% of the viscous solution.

[0040] The polysulfone resin solution is filtered through a filter to achieve the purpose of solid-liquid separation, so as to remove byproducts such as solid salts in the polysulfone resin solution, which helps to improve the purity of the obtained polysulfone resin product. After the polysulfone resin solution is filtered, a filtered polysulfone resin solution is obtained. It is understood that the filtered polysulfone resin solution contains almost no byproducts such as salts.

[0041] In step S20, the steam input device sprays water vapor into the coagulation drying kettle 1 at a pressure of 0.5-1.0 MPa, and the water vapor fills the coagulation drying kettle 1, so that the temperature in the coagulation drying kettle 1 is maintained at 160-180°C, which is higher than the boiling point of the solvent in the raw material for preparing the polysulfone resin.

[0042] In step S30, the spray device sprays the filtered polysulfone resin solution into the precipitation drying kettle 1 in the form of mist, and the mist liquid entering the precipitation drying kettle 1 contacts with high-pressure steam. Since the temperature in the precipitation drying kettle 1 is higher than the boiling point of the solvent in the raw material for preparing the polysulfone resin, the solvent in the mist liquid can be quickly vaporized to form solvent gas. After the solvent in the mist liquid is removed, the polysulfone resin can be solidified and precipitated and sink to the bottom of the precipitation drying kettle 1 to achieve the purpose of separating the polysulfone resin from the solvent. The contact of the mist liquid with the high-pressure steam can ensure that the particle size of the precipitated polysulfone resin particles is small, avoiding the steps of crushing and washing, and improving production efficiency.

[0043] In step S40, after the polysulfone resin is precipitated, the heating device is started to directly dry the precipitated polysulfone resin particles. Since the precipitation and drying of the polysulfone resin particles are completed in the precipitation drying kettle 1, there is no need to set up a separate drying device, which avoids the transfer of materials, simplifies the production process, and further improves the production efficiency of the polysulfone resin.

[0044] It should be noted that a first mounting port 11 is provided on the top of the coagulation-drying kettle 1, a second mounting port 12 is provided on one side of the upper part of the coagulation-drying kettle 1, an exhaust port 13 is provided on the other side of the upper part of the coagulation-drying kettle 1, and a discharge port 14 is provided at the bottom of the coagulation-drying kettle 1; the spray device is installed at the first mounting port 11; the steam input device is installed at the second mounting port 12; and the heating device is arranged on the coagulation-drying kettle 1.

[0045] Specifically, a filter screen 131 is provided on the inner side of the exhaust port 13, and a first exhaust pipe 132 and a second exhaust pipe 133 are provided on the outer side of the exhaust port 13. The first exhaust pipe 132 is used to discharge the steam mixed with the solvent gas, and the second exhaust pipe 133 is used to discharge the steam generated when the polysulfone resin particles are dried. After the polysulfone resin is solidified and precipitated, when the polysulfone resin particles are dried, the water vapor generated during the drying process is discharged through the second exhaust pipe 133. It can be understood that a first valve 132a is provided on the first exhaust pipe 132, and a second valve 133a is provided on the second exhaust pipe 133. During the process of solidification and precipitation of the polysulfone resin, the first valve 132a is in an open state, and the second valve 133a is in a closed state. When the polysulfone resin particles are dried, the first valve 132a is in a closed state, and the second valve 133a is in an open state.

[0046] The polysulfone resin particles after drying can be discharged from the discharge port 14, which is opened at the bottom of the precipitation drying kettle 1 and is provided with a valve. Under normal circumstances, the valve is in a closed state. When the polysulfone resin particles need to be discharged, the valve is opened, so that the polysulfone resin product can be collected easily.

[0047] Furthermore, in the step S30, the filtered polysulfone resin solution is sprayed out at a pressure of 0.15 to 0.40 MPa.

[0048] By adopting the above technical scheme, the polysulfone resin solution is sprayed out at a pressure of 0.15 to 0.40 MPa, so that the polysulfone resin solution can be more fully contacted with the flowing high-pressure steam, so that the solvent in the polysulfone resin liquid is quickly vaporized to form solvent gas, and is discharged together with the high-pressure steam, and the polysulfone resin is solidified and precipitated, and sinks to the bottom of the precipitation drying kettle 1 in the form of particles.

[0049] Furthermore, in the step S30, the filtered polysulfone resin solution is sprayed out through a spray hole with a pore size of 0.5 to 2.0 mm.

[0050] By adopting the above technical solution, the aperture of the spray hole is limited to the range of 0.5 to 2.0 mm, so that the sprayed polysulfone resin solution can be kept in a better mist state. The misted polysulfone resin solution is in more sufficient contact with the high-pressure steam, so that the solvent is better vaporized, and the polysulfone resin particles are better solidified and precipitated. The size of the formed polysulfone resin particles better meets the use requirements, and there is no need for crushing, washing and other steps.

[0051] It should be noted that the spray device includes a nozzle 24, a feed pipe 21, and a first pressure pump 22. The nozzle 24 is installed on the first installation port 11, and the nozzle 24 has a plurality of spray holes, and the aperture of the spray holes is 0.5 to 2.0 mm; the feed pipe 21 is connected to the nozzle 24; and the first pressure pump 22 is arranged on the feed pipe 21.

[0052] By adopting the above technical solution, the first pressure pump 22 pressurizes the filtered polysulfone resin solution so that the polysulfone resin solution is sprayed out through the spray hole at a pressure of 0.15 to 0.40 MPa, and the mist-like polysulfone resin liquid contacts the high-pressure steam. The solvent in the polysulfone resin liquid is rapidly vaporized to form solvent gas, which is discharged together with the high-pressure steam. The polysulfone resin is solidified and precipitated, and sinks to the bottom of the precipitation drying kettle 1 in the form of particles.

[0053] Furthermore, in the step S30, the nozzle 24 rotates at a speed of 200 to 800 rpm.

[0054] In the technical scheme of the present invention, the nozzle 24 is rotatably mounted on the first mounting port 11, and a rotary joint is provided between the nozzle 24 and the feed pipe 21. The nozzle 24 is rotatable, and the misty polysulfone resin solution can be contacted with the steam more fully, further improving the vaporization effect of the solvent in the polysulfone resin solution, so that the polysulfone resin is solidified and precipitated more fully, which not only ensures that the particle size of the polysulfone resin is smaller, but also improves the yield of the polysulfone resin. And the nozzle 24 is arranged on the top of the precipitation drying kettle 1, which helps to extend the contact time of the misty polysulfone resin solution with the steam to improve the vaporization effect of the solvent. It is understandable that the feed pipe 21 is provided with the third valve 23, and when the polysulfone resin solution needs to be transported to the precipitation drying kettle 1, the third valve 23 is opened, and when the input of the polysulfone resin solution needs to be stopped, the third valve 23 is closed. The volume of the coagulation drying kettle 1 is 3 to 5 times the volume of the polysulfone resin solution to be sprayed. For example, when the volume of the coagulation drying kettle 1 is 100L, the volume of the polysulfone resin solution to be sprayed is 20L.

[0055] In order to ensure that high-pressure steam can be smoothly transported to the coagulation and drying kettle 11, the steam input device includes a steam distributor 34, an air inlet pipe 31 and a steam controller 32. The steam distributor 34 is installed on the second installation port 12; the air inlet pipe 31 is connected to the air inlet end of the steam distributor; and the steam controller 32 is arranged on the air inlet pipe 31.

[0056] By adopting the above technical solution, the steam controller 32 can adjust the pressure of water vapor so that the water vapor is ejected through the steam distributor 34 at a pressure of 0.5 to 1.0 MPa, so that the temperature in the precipitation drying kettle 1 is maintained at 160 to 180°C, which is higher than the boiling point of the solvent in the raw materials for preparing the polysulfone resin, so that the solvent can be better vaporized and the polysulfone resin can be better solidified and precipitated.

[0057] It is understandable that a fourth valve 33 is provided on the air inlet pipe 31. When high-pressure steam needs to be delivered to the coagulation and drying kettle 1, the fourth valve 33 is opened, and when the input of high-pressure steam needs to be stopped, the fourth valve 33 is closed.

[0058] Furthermore, the heating device comprises a first jacket 51 arranged on the outer wall of the coagulation and drying kettle 1 , and a steam inlet 511 is arranged on one side of the first jacket 51 , and a steam outlet 512 is arranged on the other side.

[0059] By adopting the above technical solution, when it is necessary to dry the polysulfone resin particles at the bottom of the coagulation drying kettle 1, high-temperature steam (temperature is 120-150°C) is input from the steam inlet 511, and the high-temperature steam enters the first jacket 51 to dry the polysulfone resin particles in the coagulation drying kettle 1. After heat exchange, the temperature of the high-temperature steam is reduced, and the cooled steam is discharged from the steam outlet 512, and the cycle is repeated to dry the polysulfone resin particles in the coagulation drying kettle 1.

[0060] Furthermore, the heating device further comprises a stirring device 52, and the stirring device 52 is arranged at the lower part of the coagulation drying kettle 1. When the polysulfone resin particles are dried, the stirring device 52 is started to dry the polysulfone resin particles more fully.

[0061] Furthermore, in the step S10, when the polysulfone resin solution is subjected to solid-liquid separation, it passes through a filter membrane with a pore size of 30 to 50 μm, a filter membrane with a pore size of 10 to 20 μm, and a filter membrane with a pore size of 3 to 8 μm in sequence.

[0062] By adopting the above technical scheme, after the polysulfone resin solution is filtered by the three-layer filter membrane, by-products such as solid salts in the polysulfone resin solution can be separated more fully, the pore sizes of the filter holes of the three-layer filter membrane decrease successively, and the filter holes of each layer of the filter membrane adopt a pore size within a specific range, so that the filtered polysulfone resin solution almost does not contain by-products such as solid salts, and the purity of the obtained polysulfone resin product is better guaranteed, and the grayscale of the obtained polysulfone resin product is ≤0.1%.

[0063] The present invention also provides a polysulfone resin, which is prepared by any of the above-mentioned polysulfone resin production processes.

[0064] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0065] Example 1

[0066] A polysulfone resin production process comprises the following steps:

[0067] S10, preparing a polysulfone resin solution, and performing solid-liquid separation on the polysulfone resin solution to obtain a filtered polysulfone resin solution.

[0068] 4,4'-Dichlorodiphenyl sulfone, bisphenol A, anhydrous potassium carbonate, dimethyl sulfoxide, and toluene are put into a reactor at a molar ratio of 1:1:1.3:7:1.4, and the temperature is raised to 130°C under stirring, and dehydration reaction is carried out for 3 hours. The temperature is raised to 180°C to obtain a viscous solution, and dimethyl sulfoxide is injected into the reactor. When the reaction is stopped, the viscous solution is diluted to obtain a polysulfone resin solution, wherein the amount of dimethyl sulfoxide used in diluting the viscous solution is 1.5wt% of the viscous solution.

[0069] 20 L of polysulfone resin solution was added to the filter, and the polysulfone resin solution was sequentially passed through a first filter membrane with a pore size of 50 μm, a second filter membrane with a pore size of 15 μm, and a third filter membrane with a pore size of 8 μm, and the filtered polysulfone resin solution was collected.

[0070] S20, the steam input device sprays water vapor at a pressure of 0.75MPa into a coagulation drying kettle with a volume of 100L. The steam in the coagulation drying kettle passes through a filter and is discharged from the first exhaust pipe, so that a flowing high-pressure steam environment is formed in the coagulation drying kettle, and the temperature in the coagulation drying kettle is higher than the boiling point of the solvent in the raw material for preparing the polysulfone resin.

[0071] S30, spraying the filtered polysulfone resin solution obtained in step S10 into flowing high-pressure steam in the form of mist, so that the solvent in the polysulfone resin solution is vaporized to form solvent gas and discharged with the steam, while the polysulfone resin is solidified and precipitated in the form of particles.

[0072] The spray device sprays the filtered polysulfone resin solution into the precipitation drying kettle in the form of mist at a pressure of 0.25MPa, wherein the nozzle in the spray device has a nozzle hole with an aperture of 1mm, and the nozzle cannot rotate. The mist liquid entering the precipitation drying kettle contacts with high-pressure steam. Since the temperature in the precipitation drying kettle is higher than the boiling point of the solvent in the raw material for preparing the polysulfone resin, the solvent in the mist liquid can be quickly vaporized to form solvent gas. After the solvent in the mist liquid is removed, the polysulfone resin can be solidified and precipitated and sink to the bottom of the precipitation drying kettle.

[0073] S40, drying the polysulfone resin particles precipitated in step S30 to obtain the polysulfone resin.

[0074] When the polysulfone resin particles at the bottom of the precipitation drying kettle are dried, high-temperature steam with a temperature of 135°C is input from the steam inlet, and the high-temperature steam enters the first jacket to dry the polysulfone resin particles in the precipitation drying kettle. After heat exchange, the temperature of the high-temperature steam is reduced, and the steam after the temperature reduction is discharged from the steam outlet. This cycle is repeated to dry the polysulfone resin particles in the precipitation drying kettle, and the drying process is accompanied by stirring. The steam generated in the precipitation drying kettle is discharged through the second exhaust pipe. After drying, the polysulfone resin is obtained. The second exhaust pipe is connected to a vacuum device so that the second exhaust pipe is in a vacuum state, which is convenient for the discharge of water vapor.

[0075] Example 2

[0076] The difference between this embodiment and embodiment 1 is that in step S30, the spray device sprays the filtered polysulfone resin solution into the coagulation drying kettle in the form of mist at a pressure of 0.15 MPa, and the rest is the same as embodiment 1.

[0077] Example 3

[0078] The difference between this embodiment and embodiment 1 is that in step S30, the spray device sprays the filtered polysulfone resin solution into the coagulation drying kettle in the form of mist at a pressure of 0.40 MPa, and the rest is the same as embodiment 1.

[0079] Example 4

[0080] The difference between this embodiment and the first embodiment is that in step S30, the nozzle rotates while spraying the polysulfone resin solution in the form of mist, and the rotation speed of the nozzle is 500 rpm. The other aspects are the same as the first embodiment.

[0081] Performance Testing

[0082] The polysulfone resins prepared in Examples 1 to 4 were tested for tensile strength, flexural strength, and ash content, wherein the tensile strength test method was in accordance with GB / T 1040.2-2022, the flexural strength test method was in accordance with GB / T 9341-2008, and the ash content test method was in accordance with GB / T9345.1-2008. The test results are shown in Table 1 below.

[0083] Table 1 Tensile strength, flexural strength, and ash content of polysulfone resin

[0084] Tensile strength(MPa) Bending strength(MPa) Ash content (%) Example 1 79 110 ≤0.1 Example 2 70 101 ≤0.1 Example 3 84 115 ≤0.1 Example 4 82 116 ≤0.1

[0085] As can be seen from Table 1, the mechanical properties of the polysulfone resins obtained in Examples 1 to 4 are excellent, and the ash content does not exceed 0.1%, indicating that the purity of the polysulfone resins obtained is high and can better meet the use requirements. Examples 1 to 3 investigate the influence of the pressure of the polysulfone resin solution when it is sprayed in a mist form on the mechanical properties of the obtained product. Among them, the mechanical properties of Example 3 are better than those of Example 1 and Example 2. Considering factors such as energy consumption, Example 1 is a better example. Example 4 is based on Example 1. On the basis of Example 1, the spraying is accompanied by rotation. Compared with only spraying in Example 1, the addition of the rotation factor can further improve the mechanical properties of the obtained polysulfone resin.

[0086] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A polysulfone resin production process, characterized in that: The following steps are involved: S10, preparing a polysulfone resin solution, and performing solid-liquid separation on the polysulfone resin solution to obtain a filtered polysulfone resin solution; S20, spraying steam into the precipitation drying kettle at a pressure of not less than 0.5 MPa, so that a flowing high-pressure steam environment is formed in the kettle; S30, spraying the filtered polysulfone resin solution obtained in step S10 into flowing high-pressure steam in the form of mist, so that the solvent in the polysulfone resin solution is vaporized to form solvent gas and discharged with the steam, while the polysulfone resin is solidified and precipitated in the form of particles; S40, drying the polysulfone resin particles precipitated in step S30 to obtain the polysulfone resin.

2. The polysulfone resin production process according to claim 1, characterized in that: In the step S30, the filtered polysulfone resin solution is sprayed out at a pressure of 0.15 to 0.40 MPa.

3. The polysulfone resin production process according to claim 2, characterized in that: In the step S30, the filtered polysulfone resin solution is sprayed out through a spray hole with a pore size of 0.5 to 2.0 mm.

4. The polysulfone resin production process according to claim 2, characterized in that: In the step S30, the filtered polysulfone resin solution is sprayed out through a rotating nozzle, and the rotation speed of the nozzle is 200-800 rpm.

5. The polysulfone resin production process according to claim 1, characterized in that: In the step S20, steam is ejected at a pressure of 0.5 to 1.0 MPa.

6. The polysulfone resin production process according to claim 1, characterized in that: In the step S40, the temperature during the drying process is 120-150°C, and the drying process is accompanied by stirring.

7. The polysulfone resin production process according to claim 1, characterized in that: In the step S10, the polysulfone resin solution is filtered to separate the solid from the liquid.

8. A polysulfone resin, characterized in that The polysulfone resin is prepared by the polysulfone resin production process as described in any one of claims 1 to 7.

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