Polysulfone resin and its production process

Abstract

The present invention relates to the technical field of polysulfone resin production, and discloses a polysulfone resin and a production process thereof. The polysulfone resin production process comprises the following steps: preparing a polysulfone resin solution, and subjecting the polysulfone resin solution to solid-liquid separation to obtain a filtered polysulfone resin solution; spraying steam at a pressure of not less than 0.5 MPa into a precipitation drying kettle to form a flowing high-pressure steam environment in the kettle; spraying the filtered polysulfone resin solution into the flowing high-pressure steam in a mist-like form, so that the solvent in the polysulfone resin solution is vaporized to form solvent gas and discharged with the steam, while the polysulfone resin solidifies and precipitates in the form of particles; and drying the precipitated polysulfone resin particles to obtain the polysulfone resin. The technical solution provided by the present invention can improve the production efficiency of the polysulfone resin and improve the purity of the obtained polysulfone resin.

Description

Technical Field

[0001] The present 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, hydrolytic 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. A viscous solution is formed through a polycondensation reaction. The viscous solution is mixed with a precipitant (such as water, methanol, or ethanol) to precipitate the polysulfone resin. The precipitated polysulfone resin solid is then pulverized, washed, and dried to produce the polysulfone resin. Existing polysulfone resin production processes are complex, with low production efficiency and resulting low-purity polysulfone resin. 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 to form a flowing high-pressure steam environment 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 to 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 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 ejected 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 the solid and liquid.

[0016] The present invention also provides a polysulfone resin, which is prepared using 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 to form a flowing high-pressure steam environment 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 solution 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, thereby helping to improve the purity of the obtained polysulfone resin product. A 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 preparation raw materials of the polysulfone resin. A spray device sprays the filtered polysulfone resin solution into the precipitation drying kettle in a mist-like form. 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 preparation raw materials of 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. 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, avoids the steps of crushing and washing, improves production efficiency, and removes byproducts such as solid salts and the removal of the solvent, thereby improving the purity of the product.

[0022] After the polysulfone resin is precipitated, the drying device can directly dry the precipitated polysulfone resin particles. Because the precipitation and drying of the polysulfone resin particles are completed within the precipitation and drying kettle, there is no need for separate drying equipment, which avoids material transfer. There is also no need for crushing and washing steps before drying, which simplifies the production process, further improves the production efficiency of 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any 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 This is a schematic structural diagram of the polysulfone resin production equipment provided by the present invention.

[0026] Description of Figure Numbers:

[0027] 1. Coagulation and drying kettle; 11. First installation port; 12. Second installation port; 13. Exhaust port; 131. Filter; 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. Air 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 purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications 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 for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 this field to implement. When the combination of technical solutions is mutually 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. A viscous solution is formed through a polycondensation reaction. The viscous solution is mixed with a precipitant (such as water, methanol, or ethanol) to precipitate the polysulfone resin. The precipitated polysulfone resin solid is then pulverized, washed, and dried to produce the polysulfone resin. Existing polysulfone resin production processes are complex, with low production efficiency and resulting low-purity polysulfone resin.

[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 Figures 1 to 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 of not less than 0.5 MPa to form a flowing high-pressure steam environment 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, a catalyst, and an organic solvent, etc.) are placed in a reactor, and a viscous solution is formed through a condensation reaction. The organic solvent is then 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 the bisphenol A type polysulfone resin, and the amount of the organic solvent used during the dilution is 0.5 to 3.0 wt% of the viscous solution.

[0040] The polysulfone resin solution is filtered through a filter to achieve solid-liquid separation, thereby removing byproducts such as solid salts from the polysulfone resin solution, thereby improving the purity of the resulting polysulfone resin product. The polysulfone resin solution is filtered to obtain a filtered polysulfone resin solution. It is understood that the filtered polysulfone resin solution contains virtually 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 to 1.0 MPa. The water vapor fills the coagulation drying kettle 1, so that the temperature in the coagulation 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.

[0042] In step S30, the spray device sprays the filtered polysulfone resin solution into the precipitation drying kettle 1 in the form of a mist. 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. In addition, 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, avoid the steps of crushing and washing, and improve 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 equipment, 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 and drying kettle 1, a second mounting port 12 is provided on one side of the upper part of the coagulation and drying kettle 1, an exhaust port 13 is provided on the other side of the upper part of the coagulation and drying kettle 1, and a discharge port 14 is provided at the bottom of the coagulation and 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 and drying kettle 1.

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

[0046] The dried polysulfone resin particles can be discharged from the discharge port 14, which is located at the bottom of the precipitation drying kettle 1 and is provided with a valve. Normally, the valve is closed. When the polysulfone resin particles need to be discharged, the valve is opened, thereby facilitating the collection of the polysulfone resin product.

[0047] Furthermore, in 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 solution, the polysulfone resin solution is sprayed 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. 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 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 complete 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 no steps such as crushing and washing are required.

[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 mounting port 11, and the nozzle 24 has multiple 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; 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 nozzle at a pressure of 0.15 to 0.40 MPa. The mist-like polysulfone resin liquid contacts the high-pressure steam, and the solvent in the polysulfone resin liquid quickly vaporizes to form solvent gas, which is discharged together with the high-pressure steam. The polysulfone resin solidifies and precipitates, and sinks to the bottom of the precipitation drying kettle 1 in the form of particles.

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

[0054] In technical scheme of the present invention, described shower head 24 is rotatably mounted on described first mounting port 11, and is provided with rotary joint between described shower head 24 and described feed pipe 21.Shower head 24 is rotatable, can make mist polysulfone resin solution and steam more fully contact, further improve the vaporization effect of solvent in polysulfone resin solution, make polysulfone resin more fully solidify and separate out, both ensure that the particle diameter of polysulfone resin is less, also improve the productivity of polysulfone resin.And shower head 24 is arranged on the top of precipitation drying kettle 1, helps to extend the contact time of mist polysulfone resin solution and steam, to improve the vaporization effect of solvent.It is understandable that, feed pipe 21 is provided with the 3rd valve 23, when needing polysulfone resin solution to be transported in precipitation drying kettle 1, the 3rd valve 23 is opened, when needing to stop the input of polysulfone resin solution, the 3rd 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 is transported more smoothly into 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 mounting 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 the 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 is better vaporized and the polysulfone resin is 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 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 includes a first jacket 51 provided on the outer wall of the coagulation drying kettle 1 , and a steam inlet 511 is provided on one side of the first jacket 51 , and a steam outlet 512 is provided 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 and drying kettle 1, high-temperature steam (temperature of 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 and 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. This cycle is repeated to dry the polysulfone resin particles in the coagulation and drying kettle 1.

[0060] Furthermore, the heating device further comprises a stirring device 52, which is disposed at the lower portion of the coagulation drying kettle 1. When the polysulfone resin particles are dried, the stirring device 52 is activated to allow the polysulfone resin particles to be dried more fully.

[0061] Furthermore, in 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 solution, after the polysulfone resin solution is filtered through the three-layer filter membrane, by-products such as solid salts in the polysulfone resin solution can be more fully separated. The pore sizes of the filter pores of the three-layer filter membrane decrease in sequence, and the filter pores of each layer of the filter membrane adopt a pore size within a specific range. As a result, the filtered polysulfone resin solution contains almost no by-products such as solid salts, and the purity of the obtained polysulfone resin product is better guaranteed. The grayscale of the obtained polysulfone resin product is ≤0.1%.

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

[0064] The technical solutions of the present invention are 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 added into a reactor in 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 then 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 0.75 MPa into a coagulation and drying kettle with a volume of 100 L. The steam in the coagulation and drying kettle is discharged from the first exhaust pipe after passing through the filter, so that a flowing high-pressure steam environment is formed in the coagulation and drying kettle, and the temperature in the coagulation and drying kettle is higher than the boiling point of the solvent in the raw materials for preparing the polysulfone resin.

[0071] S30, spraying the filtered polysulfone resin solution obtained in step S10 into flowing high-pressure steam in a mist form, 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] A spray device sprays the filtered polysulfone resin solution into the coagulation and drying kettle in the form of a mist at a pressure of 0.25 MPa. The spray nozzle in the spray device has a nozzle hole with an aperture of 1 mm and the nozzle head is non-rotatable. The mist liquid entering the coagulation and drying kettle comes into contact with high-pressure steam. Because the temperature inside the coagulation and drying kettle is higher than the boiling point of the solvent in the raw materials used to prepare the polysulfone resin, the solvent in the mist liquid can be rapidly vaporized to form solvent gas. After the solvent in the mist liquid is removed, the polysulfone resin can solidify and precipitate, sinking to the bottom of the coagulation and drying kettle.

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

[0074] When drying the polysulfone resin particles at the bottom of the coagulation drying kettle, 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 coagulation drying kettle. After heat exchange, the temperature of the high-temperature steam decreases, and the cooled steam is discharged from the steam outlet. This cycle is repeated to dry the polysulfone resin particles in the coagulation drying kettle. During the drying process, stirring is accompanied, and the steam generated in the coagulation drying kettle is discharged through the second exhaust pipe. After the drying process, the polysulfone resin is obtained. The second exhaust pipe is connected to a vacuum device to keep the second exhaust pipe in a vacuum state, which facilitates 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. Other steps are the same as those in 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. Other steps are the same as those in embodiment 1.

[0079] Example 4

[0080] The difference between this embodiment and embodiment 1 is that in step S30, the nozzle rotates while spraying the polysulfone resin solution in the form of mist, and the rotation rate of the nozzle is 500 rpm. Other aspects are the same as those in embodiment 1.

[0081] Performance Testing

[0082] The polysulfone resins prepared in Examples 1 to 4 were tested for tensile strength, flexural strength, and ash content. 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 / T 9345.1-2008. 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) Flexural 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 shown in Table 1, the polysulfone resins prepared in Examples 1 to 4 have excellent mechanical properties and the ash content does not exceed 0.1%, indicating that the polysulfone resins prepared are of high purity and can well meet the requirements of use. Examples 1 to 3 investigated the influence of the pressure when the polysulfone resin solution is sprayed in a mist form on the mechanical properties of the prepared 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 the preferred example. Example 4 is based on Example 1. On the basis of Example 1, the spraying is accompanied by rotation. Compared with the spraying alone in Example 1, the addition of the rotation factor can further improve the mechanical properties of the polysulfone resin prepared.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the 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 to form a flowing high-pressure steam environment 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, wherein 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, wherein 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, wherein 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, wherein In 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, wherein 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, wherein In step S10, the polysulfone resin solution is filtered to separate the solid from the liquid.

Images