Polymerization machine for producing super absorbent resin

Abstract

The invention relates to the technical field of resin polymerization, in particular to a polymerization machine for producing super absorbent resin, which comprises a reaction zone for placing reaction raw materials for polymerization reaction and a temperature control spray head for spraying pure water to the surface of gel, and a plurality of temperature control sheets arranged along the width direction of the reaction zone are arranged between racks on two sides of the reaction zone. The reaction belts are divided into a plurality of conveying belts for conveying reaction raw materials, a temperature control sheet is tightly inserted between the two sides of the gel conveying surface of every two adjacent reaction belts, and the end, away from the reaction belts, of each temperature control sheet is communicated with a liquid inlet pipe for cooling fluid to enter; one end, far away from the liquid inlet pipe, of the temperature control sheet is communicated with a liquid outlet pipe for discharging the cooling fluid, so that the part, close to the transmission surface of the reaction belt, of the gel is unlikely to generate side reaction.

Description

Technical Field

[0001] The present application relates to the field of resin polymerization technology, and in particular to a polymerization machine for producing super absorbent resin. Background Art

[0002] During the manufacturing process, superabsorbent resins are mixed with acrylic acid or its derivatives, a crosslinking agent, and an initiator. The mixture is then fed into a polymerization device and heated to a suitable reaction temperature for polymerization. For example, a method for preparing a high-performance superabsorbent resin is described in Publication No. CN103408780B. The polymerization reaction also generates a significant amount of heat, necessitating temperature control of the mixture.

[0003] For example, in a method and apparatus for preparing a superabsorbent resin, published in CN108084365B, reactants react in a sealed space filled with inert gas to reduce oxygen's influence on the polymerization reaction. Furthermore, to control the polymerization temperature, the gel initially produced by the polymerization reaction is sprayed with pure water to cool it down and reduce the occurrence of other side reactions in the later stages of the polymerization.

[0004] Regarding the above-mentioned related technologies, spraying pure water can cool the gel surface relatively quickly, but the pure water cannot directly contact the part of the gel close to the reaction zone, and cooling is difficult to achieve in time, so the part of the gel close to the transmission surface of the reaction zone is still prone to side reactions at high temperatures. Summary of the Invention

[0005] In order to reduce the possibility of side reactions occurring due to high temperature in the part of the gel close to the transmission surface of the reaction belt, the present application provides a polymerization machine for producing super absorbent resin.

[0006] The present application provides a polymerization machine for producing super absorbent resin, which adopts the following technical solution.

[0007] A polymerization machine for producing superabsorbent resin comprises a reaction belt for placing reaction raw materials for polymerization reaction and a temperature-controlled nozzle for spraying pure water onto the surface of gel. Between the frames on both sides of the reaction belt are located a plurality of temperature-controlled plates arranged along the width of the reaction belt. The reaction belt is divided into several strips, and the temperature-controlled plates are tightly inserted between the two sides of the gel-transmitting surfaces of two adjacent reaction belts. The end of the temperature-controlled plate away from the reaction belt for lowering the gel for discharge is connected to a liquid inlet pipe for receiving a cooling fluid. The end of the temperature-controlled plate away from the liquid inlet pipe is connected to a liquid outlet pipe for discharging the cooling fluid.

[0008] By adopting the above technical solution, the temperature of the side of the gel attached to the transmission surface of the reaction belt is controlled, making it less likely for the gel to cause side reactions due to excessively high temperature in the later stage of the polymerization reaction.

[0009] Optionally, all the temperature control plates are connected to the same liquid inlet end block at their proximal ends, the liquid inlet pipe is connected to the liquid inlet end block, and all the temperature control plates are connected to the liquid outlet end block at their ends away from the liquid inlet end block, and the liquid outlet pipe is connected to the liquid outlet end block.

[0010] By adopting the above technical solution, cooling fluid can be fed into all thin temperature control plates, and all temperature control plates can be easily inserted between several transmission belts corresponding to the reaction belts.

[0011] Optionally, the temperature control plate is provided with a heat insulation plate that can block heat transfer at one end of the liquid outlet block, and a heat conductive plate is attached to the end of the heat insulation plate away from the temperature control plate, and both the heat insulation plate and the heat conductive plate can be flush with the transmission surface of the reaction belt.

[0012] By adopting the above technical solution, the heat conducting plate can transfer heat to the reaction raw materials located at the front section of the reaction zone, so that the reaction raw materials can start the polymerization reaction as soon as possible. The heat insulating plate can prevent direct heat exchange between the heat conducting plate and the temperature control plate, so that the heat conducting plate can better exert the heating effect on the reaction raw materials, and the temperature control plate can better exert the cooling effect on the gel.

[0013] Optionally, both ends of all the thermal insulation sheets are fixedly connected to thermal insulation end blocks, both ends of all the thermal conductive sheets are fixedly connected to thermal conductive end blocks, and the two thermal insulation end blocks are detachably connected to the thermal conductive end blocks and the liquid inlet end blocks in a one-to-one correspondence.

[0014] By adopting the above technical solution, the heat insulating sheet can be aligned and fitted with the temperature control sheet and the heat conducting sheet respectively, so that the heat insulating sheet, the heat conducting sheet and the temperature control sheet can be installed.

[0015] Optionally, the heat-conducting end block is detachably connected to an electric heater for raising the temperature of the heat-conducting plate. There is an insulation cover between the racks on both sides of the reaction belt, facing the heat-conducting plate and the heat-insulating plate. The bottom of the insulation cover is connected to a steam inlet pipe for supplying steam into the insulation cover.

[0016] By adopting the above technical solution, the heat conducting plate can obtain the heat generated by the electric heater, so that the heat conducting plate can cooperate with the steam inlet pipe and the heat insulation cover to heat the reaction raw materials more quickly.

[0017] Optionally, the frame of the reaction belt is detachably connected to a thickness control cylinder, and the power rod of the thickness control cylinder is detachably connected to the heat preservation cover so that the distance between the heat preservation cover and the transmission surface of the reaction belt can be changed.

[0018] By adopting the above technical solution, when the accumulation thickness of the reaction materials on the transmission surface of the reaction belt changes, the insulation cover can also be adjusted in height accordingly, so that the bottom surface of the insulation cover is always close to the upper surface of the reaction materials.

[0019] Optionally, the liquid inlet end block is detachably connected to a lifting frame, and the lifting frame is connected to a lifting cylinder at one end away from the reaction zone.

[0020] By adopting the above technical solution, when the gel is thicker, the temperature control plate can be appropriately raised to a certain height so that the top of the temperature control plate extends into the bottom of the gel, so that the gel can be cooled more fully.

[0021] Optionally, the lifting frame is fixedly connected with a liquid blocking sheet that can prevent pure water from flowing from the upper surface of the lifting frame to the lifting cylinder.

[0022] By adopting the above technical solution, the amount of pure water flowing out through the lifting rack can be reduced.

[0023] Optionally, the reaction belt is detachably connected to several temperature sensors along its own transmission direction, the temperature sensor detection end is facing the transmission surface of the reaction belt, several temperature control nozzles are arranged along the transmission direction of the reaction belt, and there is a temperature sensor between each adjacent temperature control nozzle.

[0024] By adopting the above technical solution, the gel whose temperature reaches a high value during the polymerization reaction can be cooled in time, so as to reduce the situation where the temperature-controlled nozzle sprays water too early or too late.

[0025] Optionally, the reaction belt is a conveyor belt for transporting reaction raw materials and is made of a material including boron nitride or graphene.

[0026] By adopting the above technical solution, the transmission surface of the reaction belt also has excellent thermal conductivity, so that the heating of the reaction raw materials and the cooling of the gel can be relatively timely and rapid.

[0027] In summary, this application has at least the following beneficial effects.

[0028] The temperature of the side of the gel that is in contact with the transmission surface of the reaction belt is controlled so that the gel is less likely to have side reactions caused by excessively high temperature in the later stage of the polymerization reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main structure of this application.

[0030] Explanation of the accompanying symbols: 1. Reaction zone; 2. Temperature control nozzle; 3. Temperature control plate; 4. Liquid inlet pipe; 41. Electric heater; 42. Insulation cover; 43. Steam inlet pipe; 44. Thickness control cylinder; 45. Temperature sensor; 5. Liquid outlet pipe; 51. Liquid inlet end block; 52. Liquid outlet end block; 53. Heat insulation plate; 54. Heat conducting plate; 55. Heat insulation end block; 56. Heat conducting end block; 57. Lifting frame; 58. Lifting cylinder; 59. Liquid blocking plate. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the accompanying drawings.

[0032] The present application discloses a polymerizer for producing super absorbent resin, referring to Figure 1 , including a reaction belt 1 for conveying reaction raw materials that have been mixed and are in a viscous fluid state. The reaction raw materials are heated to the reaction temperature in the front and middle sections of the reaction belt 1 and polymerized to form a gel in the middle and rear sections.

[0033] Reference Figure 1 The conveyor belt of the reaction belt 1 is divided into several sections along its width. Between each adjacent conveyor belt of the reaction belt 1, there is a heat conducting plate 54, a heat insulating plate 53, and a temperature control plate 3. The heat conducting plate 54 is located at the end of the reaction belt 1 that receives the reaction raw materials, and the temperature control plate 3 is located at the end of the reaction belt 1 that sends out the gel. The heat insulating plate 53 is located between the adjacent heat conducting plate 54 and the temperature control plate 3, and the heat insulating plate 53 is attached to the adjacent heat conducting plate 54 and the temperature control plate 3. Both ends of all the heat conducting plates 54 are fixedly connected to heat conducting end blocks 56. Both the heat conducting plates 54 and the heat conducting end blocks 56 can be made of metals with high thermal conductivity, such as copper and aluminum. Both ends of the heat insulating plates 53 are fixedly connected to heat insulating end blocks 55. Both the heat insulating plates 53 and the heat insulating end blocks 55 can be made of materials with low thermal conductivity, such as extruded polystyrene boards or vacuum insulation panels.

[0034] Reference Figure 1 The two ends of the temperature control plate 3 are fixedly connected in a one-to-one correspondence and are connected to the liquid inlet end block 51 and the liquid outlet end block 52. The temperature control plate 3, the liquid inlet end block 51, and the liquid outlet end block 52 can all be made of the same material as the heat conductive plate 54. The liquid inlet end block 51 is further away from the end of the reaction zone 1 where the gel is discharged than the liquid outlet end block 52. The liquid inlet end block 51 is connected to the liquid inlet pipe 4, which is connected to an external chiller to circulate low-temperature cooling fluid through the temperature control plate 3 to cool the gel, which has a high heat content in the later stages of the polymerization reaction. The liquid outlet end block 52 is connected to the liquid outlet pipe 5, which is connected to the return water port of the external chiller. Two insulating end blocks 55 are detachably connected to the adjacent heat conductive end block 56 and the liquid inlet end block 51. Furthermore, the conveyor belt of the reaction belt 1 may be a polytetrafluoroethylene belt mixed with boron nitride or graphene to improve the thermal conductivity of the conveyor belt of the reaction belt 1 so as to better control the temperature of the bottom of the reaction raw materials or gel.

[0035] Reference Figure 1The bottom surfaces of the liquid inlet end block 51 and the heat-conducting end block 56 close to the heat-insulating sheet 53 are detachably connected to the same lifting frame 57. Both ends of the lifting frame 57 are detachably connected to lifting cylinders 58 so that the lifting frame 57 can be moved vertically. When the thickness of the reaction raw materials is thick, the temperature control sheet 3 and the heat-conducting sheet 54 can be moved upward so that the top of the heat-conducting sheet 54 enters the bottom of the reaction raw materials and the top of the temperature control sheet 3 enters the bottom of the gel, so as to further enhance the heating effect of the thicker reaction raw materials and the cooling effect of the thicker gel.

[0036] Reference Figure 1 A row of temperature-controlled nozzles 2 are detachably connected to the frame of the reaction zone 1 along the transport direction of the reaction zone 1. Each temperature-controlled nozzle 2 is connected to an external water pump and a water tank storing pure water, so that each temperature-controlled nozzle 2 can spray pure water onto the surface of the gel to cool it down. A row of temperature sensors 45 are detachably connected to the frame of the reaction zone 1. The detection ends of the temperature sensors 45 are aligned with the transport surface of the reaction zone 1 to detect the gel temperature. A temperature sensor 45 is located between each two adjacent temperature-controlled nozzles 2 to ensure that the gel temperature at each location on the reaction zone 1 undergoing polymerization does not exceed the highest normal reaction temperature. If the difference between the corresponding gel temperature detected by the temperature sensor 45 and the highest normal reaction temperature is too small, a temperature-controlled nozzle 2 located near the side of the reaction zone 1 receiving the reaction raw materials at the corresponding temperature sensor 45 will spray pure water to promptly cool the gel and prevent the gel temperature from overheating. In addition, the temperature of the cooling fluid flowing through the temperature-controlled plate 3 can also be adjusted accordingly based on the detection results of the temperature sensor 45 to maintain the gel temperature within an appropriate range. In addition, two liquid blocking sheets 59 are fixedly connected to the upper surface of the lifting frame 57 , and the reaction zone 1 is located between the two liquid blocking sheets 59 , so that the pure water sprayed by the temperature control nozzle 2 is not easy to flow to the lifting cylinder 58 .

[0037] Reference Figure 1 , away from the heat-conducting end block 56, an electric heater 41 is detachably connected, and one heating end of the electric heater 41 extends into the heat-conducting end block 56, so that the heat-conducting plate 54 can reach a higher temperature. A heat-insulating cover 42 is slidably connected in the vertical direction between the frames on both sides of the reaction belt 1. Directly below the heat-insulating cover 42 are the heat-conducting plate 54 and the heat-insulating plate 53. The bottom of the heat-insulating cover 42 is connected to a steam inlet pipe 43, which is connected to an external steam generator to feed steam into the heat-insulating cover 42 to cooperate with the heat-conducting plate 54 to heat the reaction raw materials to the polymerization reaction temperature. At the same time, the frame of the reaction belt 1 is detachably connected to a thickness control cylinder 44, and the bottom end of the power rod of the thickness control cylinder 44 is detachably connected to the external top surface of the heat-insulating cover 42, so that the distance between the heat-insulating cover 42 and the transmission surface of the reaction belt 1 can be changed.

[0038] The implementation principle of a polymerization machine for producing superabsorbent resin in an embodiment of the present application is as follows: the reaction raw materials fall onto the reaction belt 1, first pass through the heat conducting plate 54 and the heat-insulating cover 42, so that the temperature of the reaction raw materials is raised to the temperature required for the polymerization reaction to form a gel. After the gel is driven by the reaction belt 1 and sent out of the heat-insulating cover 42, a polymerization reaction continues in the gel, releasing a large amount of heat, so that the temperature of the gel continues to rise while maintaining the temperature required for the polymerization reaction. The gel then moves to the temperature control plate 3 and the temperature control nozzle 2 to prevent the temperature of the gel from being too high. The gel then moves to the end of the reaction belt 1 and is sent to the next processing equipment.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A polymerizer for producing super absorbent resin, comprising a reaction zone (1) for placing reaction raw materials for polymerization reaction and a temperature-controlled nozzle (2) for spraying pure water onto the surface of the gel, characterized in that: Between the racks on both sides of the reaction belt (1), there are several temperature control plates (3) arranged along the width direction of the reaction belt (1). The conveyor belt for conveying the reaction raw materials of the reaction belt (1) is divided into several strips. The temperature control plates (3) are tightly inserted between the two sides of the surface of the gel conveyed by two adjacent reaction belts (1). The end of the temperature control plate (3) away from the reaction belt (1) for lowering the gel for delivery is connected to a liquid inlet pipe (4) for the cooling fluid to enter. The end of the temperature control plate (3) away from the liquid inlet pipe (4) is connected to a liquid outlet pipe (5) for the cooling fluid to be delivered.

2. The polymerizer for producing super absorbent resin according to claim 1, characterized in that: The adjacent ends of all the temperature control plates (3) are connected to the same liquid inlet end block (51), the liquid inlet pipe (4) is connected to the liquid inlet end block (51), and the ends of all the temperature control plates (3) away from the liquid inlet end block (51) are connected to the liquid outlet end block (52), and the liquid outlet pipe (5) is connected to the liquid outlet end block (52).

3. The polymerizer for producing super absorbent resin according to claim 2, characterized in that: The temperature control plate (3) is provided with a heat insulating plate (53) capable of blocking heat transfer at one end of the liquid outlet end block (52), and a heat conducting plate (54) is attached to the end of the heat insulating plate (53) away from the temperature control plate (3). Both the heat insulating plate (53) and the heat conducting plate (54) can be flush with the transmission surface of the reaction belt (1).

4. The polymerizer for producing super absorbent resin according to claim 3, characterized in that: Both ends of all the heat insulating sheets (53) are fixedly connected to heat insulating end blocks (55), and both ends of all the heat conducting sheets (54) are fixedly connected to heat conducting end blocks (56). The two heat insulating end blocks (55) are detachably connected to the heat conducting end blocks (56) and the liquid inlet end blocks (51) in a one-to-one correspondence.

5. The polymerizer for producing super absorbent resin according to claim 4, characterized in that: The heat-conducting end block (56) is detachably connected to an electric heater (41) for increasing the temperature of the heat-conducting sheet (54). Between the racks on both sides of the reaction zone (1), there is a heat-insulating cover (42) facing the heat-conducting sheet (54) and the heat-insulating sheet (53). The bottom of the heat-insulating cover (42) is connected to a steam inlet pipe (43) for supplying steam into the heat-insulating cover (42).

6. The polymerizer for producing super absorbent resin according to claim 5, characterized in that: The frame of the reaction belt (1) is detachably connected to a thickness control cylinder (44), and a power rod of the thickness control cylinder (44) is detachably connected to the heat preservation cover (42) so that the distance between the heat preservation cover (42) and the transmission surface of the reaction belt (1) can be changed.

7. The polymerizer for producing super absorbent resin according to claim 2, characterized in that: The liquid inlet end block (51) is detachably connected to a lifting frame (57), and the lifting frame (57) is connected to a lifting cylinder (58) at one end away from the reaction zone (1).

8. The polymerizer for producing super absorbent resin according to claim 7, characterized in that: The lifting frame (57) is fixedly connected to a liquid blocking sheet (59) capable of blocking pure water from flowing from the upper surface of the lifting frame (57) to the lifting cylinder (58).

9. The polymerizer for producing super absorbent resin according to claim 1, characterized in that: The reaction belt (1) is detachably connected to a plurality of temperature sensors (45) along its own transmission direction. The detection end of the temperature sensor (45) is aligned with the transmission surface of the reaction belt (1). A plurality of temperature control nozzles (2) are arranged along the transmission direction of the reaction belt (1), and a temperature sensor (45) is located between each of two adjacent temperature control nozzles (2).

10. The polymerizer for producing super absorbent resin according to claim 1, characterized in that: The reaction belt (1) is a conveyor belt for conveying reaction raw materials, and is made of a material including boron nitride or graphene.

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