Post-treatment device for polysulfone resin

Abstract

The utility model provides a post-treatment device for polysulfone resin. The post-treatment device comprises a belt conveyor, a feeding device, a vacuum extraction mechanism, a material cooling mechanism and a crushing device, the feeding device is used for coating the conveying belt with polysulfone resin fluid; the vacuum extraction mechanism comprises a vacuum cover arranged above the conveying belt in a covering mode, a porous baffle is arranged at the bottom of the vacuum cover to form an air inlet, an air outlet is formed in the top of the vacuum cover, and the air outlet is connected with a solvent collecting device through a pipeline; the material cooling mechanism is used for cooling and solidifying the polysulfone resin fluid on the conveyor belt by providing a cooling medium; the smashing device is located at the tail end of the belt conveyor and used for smashing the solidified polysulfone resin sheets. When the device is used for post-treatment of the polysulfone resin, the production time and energy consumption can be saved, the solvent consumption of a single ton of product is smaller than that of a traditional process, and the obtained polysulfone is high in stacking density and does not need a traditional granulation link.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer materials, in particular to a polysulfone resin post-processing device. Background Art

[0002] Polysulfone is a slightly amber non-crystalline transparent or translucent high molecular polymer. It is an amorphous, thermoplastic resin with the following characteristics: excellent mechanical properties, high rigidity, wear resistance, high strength, high thermal stability, and excellent mechanical properties even at high temperatures. The long-term use temperature is 160°C, and the short-term use temperature is 190°C. It is resistant to hydrolysis, has good dimensional stability, has a small molding shrinkage rate, is non-toxic, radiation-resistant, flame-retardant, and self-extinguishing. Polysulfone has excellent electrical properties in a wide range of temperature and frequency.

[0003] The most advanced production process of polysulfone resins is mainly a one-step polymerization method and the corresponding post-processing and purification process. Polymerization process: The main raw materials 4,4'-dichlorodiphenyl sulfone, bisphenol A, bisphenol S, 4,4'-dihydroxybiphenyl, potassium carbonate or potassium bicarbonate, sodium carbonate, etc. are polymerized in a solvent. When the polymerization liquid reaches the target viscosity, the polysulfone material needs to be post-processed and purified.

[0004] The most commonly used purification process is the boiling method: after the polymerization reaction is completed, the polymerization liquid is slowly transferred into water to cause phase separation of the polymerization liquid, and the polysulfone material slowly precipitates into a solid. The core technology is mainly to use a high-speed cutter to crush the polysulfone into extremely fine powder, and then soak and wash it with deionized water at about 90°C for multiple times to purify the product. This purification process has obvious disadvantages:

[0005] 1. In order to ensure that polysulfone can be smoothly transferred into water or other poor solvents, it must have sufficient fluidity. Therefore, sufficient reaction solvent is needed to ensure the low viscosity and high fluidity of the entire polysulfone resin.

[0006] 2. A large amount of reaction solvent in polysulfone resin enters the post-treatment, generating a lot of wastewater, which is difficult to recycle and consumes a lot of energy.

[0007] 3. In the traditional post-processing process, polysulfone is precipitated and crushed with water or poor solvents. Since the solid content of polysulfone resin is low, the obtained polysulfone powder is fluffy and has a very low density. It must be granulated for easy storage and transportation. Utility Model Content

[0008] The utility model provides a polysulfone resin post-processing device for solving the technical problems raised in the background technology.

[0009] The technical solution adopted by the utility model to solve the above technical problems is:

[0010] A polysulfone resin post-processing device comprises a belt conveyor. A feeding device, a vacuum extraction mechanism, a material cooling mechanism and a crushing device are sequentially arranged along the material transportation direction of the belt conveyor.

[0011] The belt conveyor comprises a first transmission hub, a second transmission hub, and a conveyor belt installed between the first transmission hub and the second transmission hub, wherein the conveyor belt is divided into an upper conveyor belt and a lower conveyor belt;

[0012] The feeding device is located above the upper conveyor belt and is used to evenly coat the polysulfone resin fluid on the upper conveyor belt;

[0013] The vacuum extraction mechanism comprises a vacuum cover arranged above the upper conveyor belt, a porous baffle is arranged at the bottom of the vacuum cover and on both sides of the upper conveyor belt to form an air inlet, and an air outlet is arranged at the top of the vacuum cover, and the air outlet is connected to the solvent collection device through a pipeline;

[0014] The material cooling mechanism is located between the upper conveyor belt and the lower conveyor belt, and provides a cooling medium to act on the polysulfone resin fluid on the upper conveyor belt to cool and solidify it.

[0015] The pulverizing device is arranged at the end of the belt conveyor and is used for pulverizing the solidified polysulfone resin flakes.

[0016] As a further preferred embodiment of the present invention, the conveyor belt is made of stainless steel.

[0017] As a further preference of the present invention, the feeding device adopts a reciprocating feeder or a spraying device, a scraping device. For reference, the model of the reciprocating feeder can be selected as GLW225 / 4 / S or GLW330 / 7.5 / S or GLW590 / 18.5 / S.

[0018] As a further preferred embodiment of the utility model, the porous baffle is in the shape of a flat plate, and a strip-shaped protrusion extending downward and perpendicular to the material transmission direction is provided on one side close to the feeding device. The protrusion can control the thickness of the polysulfone resin coating entering the vacuum extraction area. When the coating coming out of the reciprocating feeder is too thick or large particles of foreign matter appear, the protrusion can play a blocking role to prevent the polysulfone resin or impurities from entering the vacuum cover from the porous baffle.

[0019] As a further preferred embodiment of the present invention, the protrusion is as wide as or greater than the width of the conveyor belt.

[0020] As a further preference of the present invention, the distance between the bottom of the protrusion and the conveyor belt is 0.1~80mm, for example 1mm, 10mm, 20mm, 30mm, etc. By controlling the coating thickness and the length of the vacuum extraction area, etc., an ideal solvent extraction effect can be obtained.

[0021] As a further preferred embodiment of the utility model, the material cooling mechanism includes a spray water tank arranged below the conveyor belt, the spray water tank has a built-in circulating cooling pipe, the circulating cooling pipe is used to control the water temperature of the spray water tank, the bottom water outlet of the spray water tank is connected to a plurality of spray pumps through a pipe, the water spraying direction of the spray pump is toward the conveyor belt, the sprayed water is fan-shaped upward until it touches the bottom of the conveyor belt, thereby cooling the polysulfone sheet on the conveyor belt and finally falling back into the spray water tank.

[0022] As a further preferred embodiment of the present invention, the pulverizing device is a roller type pulverizer, model number is MSA-F600. After cooling, the polysulfone resin in solid flake form enters the pulverizer and is pulverized into particles.

[0023] As a further preferred embodiment of the present invention, the solvent collecting device includes a condenser, a solvent storage tank and a vacuum pump. The inlet end of the condenser is connected to the air outlet on the top of the vacuum hood through a pipe, the outlet end of the condenser is connected to the inlet end of the solvent storage tank, and the outlet end of the solvent storage tank is provided with the vacuum pump.

[0024] As a further preferred embodiment of the present invention, a first heating module is further included. A material distribution area is formed between the feeding device and the upper conveyor belt, and a vacuum extraction area is formed between the vacuum cover and the upper conveyor belt. The first heating module is arranged at the bottom of the upper conveyor belt and below the material distribution area and the vacuum extraction area, and its length covers the material distribution area and the vacuum extraction area. The function of the first heating module is to heat the polysulfone resin material from falling into the conveyor belt to leaving the vacuum extraction area.

[0025] As a further preferred embodiment of the present invention, the heating temperature of the first heating module is 150-160°C.

[0026] As a further preferred embodiment of the present invention, a second heating module is further included, and the second heating module is arranged in the first transmission hub or on the lower conveyor belt near the first transmission hub. The function of the second heating module is to preheat the conveyor belt before the polysulfone resin material contacts the conveyor belt, so as to prevent the polysulfone resin from being partially solidified in the early stage of contacting the conveyor belt due to the low temperature of the conveyor belt, which is not conducive to decompression and desolvation.

[0027] As a further preferred embodiment of the present invention, the heating temperature of the second heating module is 150-160°C.

[0028] Compared with the prior art, the utility model has the following advantages or technical effects:

[0029] The utility model provides a polysulfone resin post-processing device, which applies concentrated polysulfone resin to the conveyor belt of a conveyor, removes residual solvent in the coating by vacuum extraction, cools and solidifies, crushes into particles, and then dries and packages. During the treatment process, a large amount of clean water is not required to wash the organic solvent, which saves water and reduces the amount of engineering wastewater. Continuous coating combined with vacuum extraction can greatly shorten the solvent removal time and improve production efficiency. The solidified resin flakes have a high solid content and a large bulk density, which is close to the density of polysulfone. They can be directly crushed and packaged without the need for traditional plasticizing and granulation, saving production time and energy consumption. The amount of solvent consumed per ton of product is less than that of traditional processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model and its features, shapes and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings.

[0031] Figure 1 It is a structural schematic diagram of a polysulfone resin post-processing device;

[0032] Figure 2 is an enlarged schematic diagram of the protrusion;

[0033] In the figure, 1. first transmission hub, 2. second transmission hub, 3-1. upper conveyor belt, 3-2. lower conveyor belt, 4. feeding device, 5-1. first heating module, 5-2. second heating module, 6. porous baffle, 6-1. protrusion, 7. vacuum cover, 8. condenser, 9. solvent storage tank, 10. vacuum pump, 11. spray water tank, 12. crushing device, 13. solid outlet, 14. spray pump, 15. circulating cooling pipe. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

[0035] like Figure 1As shown, the utility model provides a polysulfone resin post-processing device, including a belt conveyor, and a feeding device 4, a vacuum extraction mechanism, a material cooling mechanism and a crushing device 12 arranged in sequence along the material transportation direction of the belt conveyor. The belt conveyor includes a first transmission hub 1, a second transmission hub 2, and a conveyor belt installed between the first transmission hub 1 and the second transmission hub 2, and the conveyor belt is divided into an upper conveyor belt 3-1 and a lower conveyor belt 3-2. According to the area where the equipment is located, the upper conveyor belt 3-1 is divided into a feeding area, a vacuum extraction area, a cooling area and a crushing area in sequence.

[0036] To further illustrate, the feeding device 4 adopts a reciprocating feeder, which evenly coats the fluid containing the polysulfone resin on the upper conveyor belt 3-1 to form a continuous polysulfone resin fluid layer, and the reciprocating feeder can adjust the thickness of the polysulfone resin fluid.

[0037] Further explanation, the vacuum extraction mechanism includes a vacuum hood 7, which is arranged just above the upper conveyor belt 3-1 and covers the vacuum extraction area. The bottom of the vacuum hood 7 and both sides of the upper conveyor belt 3-1 are provided with porous baffles 6 to form an air inlet. The porous baffles 6 are used to uniformly balance the negative pressure on the one hand, and on the other hand, they can protect the vacuum equipment and prevent particulate matter from entering the vacuum equipment. The height of the bottom of the vacuum hood 7 from the upper conveyor belt 3-1 is adjustable. In this embodiment, the distance between the bottom of the vacuum hood 7 and the upper conveyor belt 3-1 is 50mm. The top of the vacuum hood 7 is provided with an air outlet, which is connected to the solvent collection device through a pipeline. The solvent collection device includes a condenser 8, a solvent storage tank 9 and a vacuum pump 10 connected in sequence by pipelines. The top surface of the vacuum hood 7 is an arc-shaped design, and the air outlet is located in the middle of the outer arc. The arc-shaped design forms a guide structure on the inner top surface of the vacuum hood 7. The solvent will enter the air outlet along the arc-shaped top surface. This structure can improve the efficiency of vacuum extraction and make the solvent removal more thorough.

[0038] Further explanation, the material cooling mechanism includes a spray water tank 11 arranged below the upper conveyor belt 3-1 in the cooling area, and a circulating cooling pipe 15 is built in the spray water tank 11. The circulating cooling pipe 15 is used to control the water temperature of the spray water tank 11, and the water in the spray water tank 11 can be recycled. The bottom water outlet of the spray water tank 11 is connected to a plurality of spray pumps 14 through a pipeline. The spray direction of the spray pump 14 is toward the upper conveyor belt 3-1. The sprayed water is fan-shaped upward until it contacts the upper conveyor belt 3-1, fully contacts and exchanges heat with the polysulfone sheet on the upper conveyor belt 3-1, and finally falls back to the spray water tank.

[0039] Further explanation, the crushing device 12 is a roller crusher, which is arranged at the end of the belt conveyor and is used to crush the cooled polysulfone resin flakes. A material guide channel is formed between the crushing device 12 and the belt conveyor, and the end of the material guide channel is a solid outlet 12.

[0040] Further explanation, a strip-shaped protrusion 6-1 extending downward and having the same width as the conveyor belt is provided on one side of the porous baffle plate 6 at the bottom of the vacuum cover 7 close to the feeding device 4. Figure 2 As shown, the distance between the bottom of the protrusion 6-1 and the conveyor belt is 5 mm. When the coating coming out of the feeding device 4 is too thick or large particles of foreign matter appear, the protrusion 6-1 can play a blocking role to prevent polysulfone resin or impurities from entering the vacuum cover 7 from the porous baffle 6.

[0041] Further explanation, a first heating module 5-1 is arranged below the belt conveyor material feeding area and the vacuum extraction area. The first heating module 5-1 is close to the lower surface of the upper conveyor belt 3-1 and is used to heat the conveyor belts in the material feeding area and the vacuum extraction area, so that the temperature of the conveyor belts in this area is maintained in the range of 150-160°C, maintaining good fluidity of the polysulfone resin and facilitating the removal of the solvent. A second heating module 5-2 is arranged in the first transmission hub 1 or on the lower conveyor belt 3-2 near the first transmission hub 1. The function of the second heating module 5-2 is to preheat the conveyor belt in advance before the polysulfone resin material contacts the conveyor belt. The preheating temperature is 150-160°C to prevent the polysulfone resin from being partially solidified due to the low temperature of the conveyor belt in the early stage of contacting the conveyor belt, which is not conducive to decompression and solvent removal.

[0042] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A polysulfone resin post-processing device, comprising a belt conveyor, characterized in that: A feeding device, a vacuum extraction mechanism, a material cooling mechanism and a crushing device are sequentially arranged along the material transport direction of the belt conveyor; The belt conveyor includes a first transmission hub, a second transmission hub, and a conveyor belt installed between the first transmission hub and the second transmission hub, and the conveyor belt is divided into an upper conveyor belt and a lower conveyor belt; the feeding device is located above the upper conveyor belt, and the vacuum extraction mechanism includes a vacuum cover arranged above the upper conveyor belt, and the bottom of the vacuum cover and on both sides of the upper conveyor belt are provided with porous baffles to form an air inlet, and the top of the vacuum cover is provided with an air outlet, which is connected to a solvent collection device through a pipeline; the material cooling mechanism is located between the upper conveyor belt and the lower conveyor belt, and the crushing device is arranged at the end of the belt conveyor.

2. A polysulfone resin post-processing device according to claim 1, characterized in that: The conveyor belt is made of stainless steel.

3. A polysulfone resin post-processing device according to claim 1, characterized in that: The feeding device adopts a reciprocating feeder.

4. A polysulfone resin post-processing device according to claim 1, characterized in that: The porous baffle is in the shape of a flat plate, and a strip-shaped protrusion extending downward and perpendicular to the material transmission direction is provided on one side close to the feeding device. The protrusion is equal to or greater than the width of the conveyor belt.

5. A polysulfone resin post-processing device according to claim 4, characterized in that: The distance between the bottom of the protrusion and the conveyor belt is 0.1 mm to 80 mm.

6. The polysulfone resin post-processing device according to claim 1, characterized in that: The material cooling mechanism includes a spray water tank arranged below the conveyor belt, the spray water tank has a built-in circulating cooling pipe, and the bottom water outlet is connected to multiple spray pumps through pipes, and the water spraying direction of the spray pump is toward the conveyor belt.

7. A polysulfone resin post-processing device according to claim 1, characterized in that: The pulverizing device adopts a roller type pulverizer.

8. The polysulfone resin post-processing device according to claim 1, characterized in that: The solvent collecting device includes a condenser, a solvent storage tank and a vacuum pump. The inlet end of the condenser is connected to the air outlet on the top of the vacuum cover through a pipe, the outlet end of the condenser is connected to the inlet end of the solvent storage tank, and the outlet end of the solvent storage tank is provided with the vacuum pump.

9. The polysulfone resin post-processing device according to claim 1, characterized in that: It also includes a first heating module, which is arranged at the bottom of the upper conveyor belt and below the feeding device and the vacuum extraction mechanism.

10. The polysulfone resin post-processing device according to claim 1, characterized in that: It also includes a second heating module, which is arranged in the first transmission hub or on the lower conveyor belt close to the first transmission hub.

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