A device for efficiently removing residual acetone from aqueous polyurethane

Abstract

The utility model relates to waterborne polyurethane production technical field discloses a device of residual acetone in high -efficient out of waterborne polyurethane, including the reaction kettle, the reaction kettle side wall fixed mounting has spiral heating pipe, the utility model discloses the setting and the design of stirring blade present V -shaped flying wing shape of stirring mechanism, not only can promote material even heat, accelerate acetone volatilization, can also produce the big shearing force by its edge, effectively break the agglomerate in waterborne polyurethane, prevent local heating temperature too high, the colloid surface moisture volatilization causes the skin, and let residual acetone fully expose, one side through the setting of liquid pumping and spraying mechanism, further greatly increase gas -liquid contact area, more acetone can be fast volatilized, speed up the acetone from waterborne polyurethane in the separation speed, high -efficient realization acetone and other component separation, greatly shorten the processing time, significantly improve acetone removal rate, promote overall production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of waterborne polyurethane production, and in particular to a device for efficiently removing residual acetone from waterborne polyurethane. Background Technology

[0002] In the production process of waterborne polyurethane, acetone is often used as a solvent to adjust the viscosity of the system, improve the solubility and processing performance of the resin, and ensure the smooth progress of the production process. However, residual acetone not only affects the quality of waterborne polyurethane products, but also causes problems such as residual odor, film-forming performance, and unstable mechanical properties. Therefore, the efficient removal of residual acetone from waterborne polyurethane has become a crucial step in the production process.

[0003] Traditional equipment can only achieve simple mixing of materials during use, which cannot meet the requirements for efficient separation of acetone in complex waterborne polyurethane systems. Furthermore, existing acetone separation equipment lacks optimized design for gas-liquid mass transfer processes, resulting in limited gas-liquid contact area and slow acetone removal from waterborne polyurethane. This not only prolongs the production cycle but also reduces the acetone removal rate. Based on this, an improved device for efficiently removing residual acetone from waterborne polyurethane is proposed. Utility Model Content

[0004] In view of the above-mentioned problems that existing methods cannot meet the requirements of efficient acetone separation, lack of optimized design for gas-liquid mass transfer process, and limited gas-liquid contact area, this utility model is proposed.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a device for efficiently removing residual acetone from waterborne polyurethane, comprising a reaction vessel, wherein a spiral heating tube is fixedly installed on the side wall of the reaction vessel, and a plurality of support legs are fixedly connected to the bottom end of the reaction vessel, wherein the plurality of support legs are fixedly connected to the same connecting plate, and the reaction vessel includes a stirring mechanism, a liquid pumping and spraying mechanism and a lifting mechanism.

[0006] The reactor is equipped with a sealed box. The lower part of the sealed box has an equipment cavity, and the upper part of the sealed box has a diversion cavity. A liquid pump is fixedly installed inside the equipment cavity. The input end of the liquid pump passes through the bottom wall of the equipment cavity and is fixedly sleeved in the middle of the liquid collecting pipe. The top surface of the liquid collecting pipe is fixedly connected to the bottom end of the sealed box. Both ends of the liquid collecting pipe are fixedly sleeved with liquid pumping pipes. The output end of the liquid pump passes through the top wall of the equipment cavity and extends into the diversion cavity. Several nozzles are threadedly connected to the top of the sealed box, and the interior of the nozzles is connected to the diversion cavity.

[0007] As a preferred embodiment, a mounting frame is fixedly installed at the center of the top of the reactor, a lifting motor is fixedly installed at the top of the mounting frame, a lead screw is fixedly sleeved on the output shaft of the lifting motor, both ends of the lead screw are rotatably connected to the inner wall of the fixed cylinder, and the top of the fixed cylinder is fixedly connected to the inner top wall of the reactor.

[0008] As a preferred embodiment, the outer surface of the lead screw is threaded with a threaded sleeve, and the bottom end of the threaded sleeve is fixedly connected to a plurality of lifting plates, the bottom ends of the plurality of lifting plates passing through the inner bottom wall of the fixed cylinder and fixedly connected to the top of the sealing box.

[0009] As a preferred embodiment, a stirring motor is fixedly installed at the top of the connecting plate, a support shaft is fixedly sleeved on the output shaft of the stirring motor, the top of the support shaft passes through the bottom wall of the reactor and is fixedly sleeved on a stirring frame, and a number of stirring blades are fixedly connected to the inner side of the stirring rod of the stirring frame, and the number of stirring blades are arranged in a V-shaped wing shape.

[0010] As a preferred embodiment, a first vacuum tube is fixedly sleeved on one side of the top of the reactor, a condenser is fixedly sleeved on one end of the first vacuum tube, and a second vacuum tube is fixedly sleeved on one end of the condenser.

[0011] As a preferred embodiment, a feed inlet is fixedly provided on the other side of the top of the reactor, and a discharge outlet is provided on one side of the bottom of the reactor.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] 1. This utility model, through the setting of the stirring mechanism and the V-shaped wing-like design of the stirring blades, not only promotes uniform heating of materials and accelerates acetone volatilization, but also effectively breaks up agglomerates in waterborne polyurethane by the large shear force generated by its edges, preventing excessively high local heating temperature and skin formation caused by moisture evaporation from the colloid surface, and fully exposing residual acetone. On the other hand, the setting of the liquid spraying mechanism further increases the gas-liquid contact area significantly, allowing more acetone to volatilize quickly, accelerating the separation of acetone from waterborne polyurethane, efficiently achieving the separation of acetone from other components, greatly shortening the processing time, significantly improving the acetone removal rate, and enhancing overall production efficiency.

[0014] 2. This utility model enables the sealing box to move up and down inside the reactor by starting the lifting motor, thereby adjusting the liquid level according to the different liquid heights of waterborne polyurethane in actual production. This ensures that equipment such as the liquid pump can work in the appropriate position, improves the liquid extraction efficiency, and guarantees the stability and efficiency of the entire separation process. Attached Figure Description

[0015] Figure 1This is a side view of the structure of this utility model;

[0016] Figure 2 This is a side sectional view of the present invention.

[0017] Figure 3 This is a cross-sectional structural diagram of the lifting mechanism in this utility model;

[0018] Figure 4 This is a cross-sectional structural diagram of the liquid extraction and spraying mechanism in this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Reactor; 11. Inlet; 12. Outlet; 13. Spiral heating tube; 2. Support leg; 21. Connecting plate; 3. First vacuum tube; 31. Second vacuum tube; 4. Condensation tower; 5. Stirring mechanism; 51. Stirring motor; 52. Support shaft; 53. Stirring frame; 54. Stirring blade; 6. Liquid pumping and spraying mechanism; 61. Sealed box; 62. Equipment cavity; 63. Diversion cavity; 64. Liquid pump; 65. Liquid collecting pipe; 66. Liquid pumping pipe; 67. Nozzle; 7. Lifting mechanism; 71. Mounting frame; 72. Lifting motor; 73. Fixed cylinder; 74. Lead screw; 75. Screw sleeve; 76. Lifting plate. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] Reference Figures 1-4 This is the first embodiment of the present invention, which provides a device for efficiently removing residual acetone from waterborne polyurethane, including a reaction vessel 1, a spiral heating tube 13 fixedly installed on the side wall of the reaction vessel 1, a plurality of support legs 2 fixedly connected to the bottom end of the reaction vessel 1, and a common connecting plate 21 fixedly connected between the plurality of support legs 2. The reaction vessel 1 includes a stirring mechanism 5, a liquid pumping and spraying mechanism 6 and a lifting mechanism 7.

[0023] The reactor 1 is equipped with a sealed box 61. The lower part of the sealed box 61 has an equipment cavity 62, and the upper part of the sealed box 61 has a diversion cavity 63. A liquid pump 64 is fixedly installed inside the equipment cavity 62. The input end of the liquid pump 64 passes through the bottom wall of the equipment cavity 62 and is fixedly sleeved in the middle of the liquid collection pipe 65. The top surface of the liquid collection pipe 65 is fixedly connected to the bottom end of the sealed box 61. Both ends of the liquid collection pipe 65 are fixedly sleeved with liquid extraction pipes 66. The output end of the liquid pump 64 passes through the top wall of the equipment cavity 62 and extends into the diversion cavity 63. Several nozzles 67 are threadedly connected to the top of the sealed box 61. The interior of the nozzles 67 is connected to the diversion cavity 63.

[0024] A stirring motor 51 is fixedly installed at the top of the connecting plate 21. A support shaft 52 is fixedly sleeved on the output shaft of the stirring motor 51. The top of the support shaft 52 passes through the bottom wall of the reactor 1 and is fixedly sleeved on a stirring frame 53. Several stirring blades 54 are fixedly connected to the inner side of the stirring rod of the stirring frame 53. The several stirring blades 54 are arranged in a V-shaped flying wing shape.

[0025] During use, the spiral heating tube 13 surrounds the side wall of the reactor 1, which can evenly transfer heat to the material in the reactor 1, making it easier for the acetone in the water-based polyurethane to volatilize.

[0026] The stirring motor 51 starts, driving the support shaft 52 to rotate. The stirring frame 53 at the top of the support shaft 52 rotates accordingly. The stirring frame 53 drives the stirring blades 54 to stir the waterborne polyurethane, making the material heat more evenly, accelerating the volatilization of acetone, and also allowing acetone to be fully separated from the waterborne polyurethane. The V-shaped wing design of the stirring blades 54 generates a large shear force between its edges and the waterborne polyurethane during rotation, which helps to break the agglomerates or micelle structures in the waterborne polyurethane, allowing residual acetone to be more fully exposed in the system, accelerating the separation process of acetone and waterborne polyurethane.

[0027] Next, the liquid pump 64 is started. The liquid pump 64 draws out the liquid at the bottom of the reactor 1 through the liquid collection pipe 65 and the liquid extraction pipe 66, and then delivers it to the distribution chamber 63 through the output end of the liquid pump 64. The liquid entering the distribution chamber 63 is sprayed out through the nozzle 67 connected to the distribution chamber 63, which increases the gas-liquid contact area, thereby accelerating the evaporation rate from the water-based polyurethane, achieving more efficient separation of acetone from other components, shortening the entire dehydration and acetone removal process time, and improving the acetone removal rate.

[0028] This design, through the setting of the stirring mechanism 5 and the V-shaped flying wing design of the stirring blades 54, not only promotes uniform heating of materials and accelerates acetone volatilization, but also effectively breaks down the agglomerates or micelle structures in the waterborne polyurethane by the large shear force generated by its edges, allowing residual acetone to be fully exposed. On the other hand, the liquid pump 64 draws liquid from the bottom of the reactor 1 through the liquid collection pipe 65 and the liquid extraction pipe 66, and then sprays it through the nozzle 67. This process greatly increases the gas-liquid contact area, allowing more acetone to volatilize quickly, accelerating the separation of acetone from the waterborne polyurethane, efficiently separating acetone from other components, significantly shortening the processing time, significantly improving the acetone removal rate, and enhancing the overall production efficiency.

[0029] Reference Figures 1-4This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: a mounting frame 71 is fixedly installed at the center of the top of the reactor 1, a lifting motor 72 is fixedly installed at the top of the mounting frame 71, a lead screw 74 is fixedly sleeved on the output shaft of the lifting motor 72, both ends of the lead screw 74 are rotatably connected to the inner wall of the fixed cylinder 73, and the top of the fixed cylinder 73 is fixedly connected to the inner top wall of the reactor 1.

[0030] The outer surface of the lead screw 74 is threaded with a screw sleeve 75. Several lifting plates 76 are fixedly connected to the bottom end of the screw sleeve 75. The bottom ends of the lifting plates 76 penetrate the bottom wall inside the fixed cylinder 73 and are fixedly connected to the top of the sealing box 61.

[0031] During use, when the sealing box 61 needs to adapt to different liquid levels, the lifting motor 72 is started. The mounting bracket 71 provides a mounting base for the lifting motor 72. The output shaft of the lifting motor 72 drives the lead screw 74 to rotate. The fixed cylinder 73 plays the role of supporting and positioning the lead screw 74 to ensure the stability of the rotation of the lead screw 74.

[0032] When the lead screw 74 rotates, the screw sleeve 75 moves up and down along the axial direction of the lead screw 74. Several lifting plates 76 move synchronously with the screw sleeve 75. The lifting plates 76 drive the sealing box 61 to move up and down inside the reactor 1, so that the position of the sealing box 61 in the reactor 1 can be adjusted according to the actual production needs, so that the sealing box 61 can adapt to different liquid levels.

[0033] Reference Figures 1-4 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that: a first vacuum tube 3 is fixedly sleeved on one side of the top of the reactor 1, a condenser tower 4 is fixedly sleeved on one end of the first vacuum tube 3, and a second vacuum tube 31 is fixedly sleeved on one end of the condenser tower 4.

[0034] A feed inlet 11 is fixedly opened on the other side of the top of the reactor 1, and a discharge outlet 12 is opened on one side of the bottom of the reactor 1.

[0035] During use, an external vacuum pump is connected to the second vacuum tube 31. After the vacuum pump is started, the air in the reactor 1 is extracted in sequence through the second vacuum tube 31, the condenser tower 4, and the first vacuum tube 3, so that a negative pressure environment is formed inside the reactor 1. The vacuum environment helps to lower the boiling point of acetone, so that it can evaporate at a lower temperature, improve the separation efficiency and reduce the impact on the performance of waterborne polyurethane.

[0036] Waterborne polyurethane raw material enters reactor 1 through inlet 11. After the acetone removal process is completed, the treated waterborne polyurethane is discharged from reactor 1 through outlet 12.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for efficiently removing residual acetone from waterborne polyurethane, comprising a reaction vessel (1), characterized in that: The side wall of the reactor (1) is fixedly equipped with a spiral heating tube (13), and the bottom end of the reactor (1) is fixedly connected with a number of support legs (2). The support legs (2) are fixedly connected with the same connecting plate (21). The reactor (1) includes a stirring mechanism (5), a liquid pumping and spraying mechanism (6) and a lifting mechanism (7). The reactor (1) is equipped with a sealed box (61). The sealed box (61) has a device cavity (62) at the bottom and a diversion cavity (63) at the top. A pump (64) is fixedly installed inside the device cavity (62). The input end of the pump (64) passes through the bottom wall of the device cavity (62) and is fixedly sleeved in the middle of the collection pipe (65). The top surface of the collection pipe (65) is fixedly connected to the bottom end of the sealed box (61). Both ends of the collection pipe (65) are fixedly sleeved with pumping pipes (66). The output end of the pump (64) passes through the top wall of the device cavity (62) and extends into the diversion cavity (63). The top of the sealed box (61) is threaded with several nozzles (67), and the interior of the nozzles (67) is connected to the diversion cavity (63).

2. The device for efficiently removing residual acetone from waterborne polyurethane according to claim 1, characterized in that: A mounting bracket (71) is fixedly installed at the center of the top of the reactor (1). A lifting motor (72) is fixedly installed at the top of the mounting bracket (71). A lead screw (74) is fixedly sleeved on the output shaft of the lifting motor (72). Both ends of the lead screw (74) are rotatably connected to the inner wall of the fixed cylinder (73). The top of the fixed cylinder (73) is fixedly connected to the top wall inside the reactor (1).

3. The device for efficiently removing residual acetone from waterborne polyurethane according to claim 2, characterized in that: The lead screw (74) has a threaded sleeve (75) on its outer surface. The bottom end of the sleeve (75) is fixedly connected to several lifting plates (76). The bottom ends of the lifting plates (76) penetrate the bottom wall inside the fixed cylinder (73) and are fixedly connected to the top of the sealing box (61).

4. The device for efficiently removing residual acetone from waterborne polyurethane according to claim 1, characterized in that: A stirring motor (51) is fixedly installed at the top of the connecting plate (21). A support shaft (52) is fixedly sleeved on the output shaft of the stirring motor (51). The top of the support shaft (52) passes through the bottom wall of the reactor (1) and is fixedly sleeved on a stirring frame (53). Several stirring blades (54) are fixedly connected to the inner side of the stirring rod of the stirring frame (53). The several stirring blades (54) are arranged in a V-shaped flying wing shape.

5. The device for efficiently removing residual acetone from waterborne polyurethane according to claim 1, characterized in that: A first vacuum tube (3) is fixedly sleeved on one side of the top of the reactor (1), a condenser tower (4) is fixedly sleeved on one end of the first vacuum tube (3), and a second vacuum tube (31) is fixedly sleeved on one end of the condenser tower (4).

6. The device for efficiently removing residual acetone from waterborne polyurethane according to claim 1, characterized in that: The reactor (1) has a feed inlet (11) fixedly opened on the other side of the top end, and a discharge outlet (12) is opened on one side of the bottom end of the reactor (1).

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