Reduced pressure distillation equipment for preparing waterborne polyurethane

Abstract

The reduced pressure distillation equipment comprises a distillation retort main body with an upward opening, the top of the distillation retort main body is hermetically connected with a distillation retort end cover with a downward opening, an electric heating mechanism is fixed at the bottom of the distillation retort main body, and a condensation recovery mechanism is mounted in the distillation retort main body; an auxiliary distillation mechanism is arranged in the distillation retort main body; the auxiliary distillation mechanism comprises a plurality of auxiliary distillation drainage plates fixed on the inner side wall of the distillation retort main body; the edge of the auxiliary distillation drainage plate is fixedly connected with the inner side wall of the distillation retort main body through a plurality of fixed connecting plates; a circulation gap is formed between the edge of the auxiliary distillation drainage plate and the inner side wall of the distillation retort main body; by adopting a circulating drainage mode, raw materials are conveyed to a high position and circulate from top to bottom along each auxiliary distillation drainage plate, so that the evaporation area of the raw materials is increased, and the distillation treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer material preparation, in particular to a vacuum distillation device for preparing waterborne polyurethane. Background Technique

[0002] Waterborne polyurethane is one of the synthetic resins with excellent comprehensive performance. Due to its many varieties of synthetic monomers, mild, specific and controllable reaction conditions, large room for formula adjustment and the microstructure characteristics of polymer materials, it can be widely used in coatings, adhesives, foam plastics, synthetic fibers and elastomers, and has become one of the essential materials for people's clothing, food, housing and transportation;

[0003] There is a vacuum distillation process in the preparation process of waterborne polyurethane. Existing equipment still lacks in terms of pressure control efficiency and distillation efficiency, and needs to be further improved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a vacuum distillation device for preparing waterborne polyurethane, which is convenient for more quickly and accurately controlling the distillation pressure.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A vacuum distillation device for preparing waterborne polyurethane, including a distillation tank main body with an upward opening, a distillation tank end cover with a downward opening is hermetically connected to the top of the distillation tank main body, an electric heating mechanism is fixed to the bottom of the distillation tank main body, and a condensation recovery mechanism is installed inside the distillation tank main body;

[0007] An auxiliary distillation mechanism is provided inside the distillation tank main body.

[0008] Preferably, the auxiliary distillation mechanism includes multiple auxiliary distillation diversion plates fixed on the inner side wall of the distillation tank main body, and the auxiliary distillation diversion plates are arranged in a spiral extension around the vertical axis of the distillation tank main body;

[0009] The edge of the auxiliary distillation diversion plate is fixedly connected to the inner side wall of the distillation tank main body through multiple fixed connection plates, and there is a circulation gap between the edge of the auxiliary distillation diversion plate and the inner side wall of the distillation tank main body.

[0010] Explanation: The material flows down along each auxiliary distillation diversion plate, increasing the evaporation area of the raw material and improving the distillation treatment efficiency.

[0011] Preferably, a vertically extending circulation diversion support cylinder is fixed to the inner bottom of the distillation tank main body, multiple vertically extending circulation diversion tubes are fixed inside the circulation diversion support cylinder, the lower end of the circulation diversion tube is connected to the inside of the distillation tank main body through a diversion input elbow, and the upper end of the circulation diversion tube is connected to the inside of the distillation tank main body through a diversion output elbow;

[0012] A spiral conveying rod is rotatably connected in the circulation drainage tube, a driving accommodating shell is fixed on the top of the circulation drainage support cylinder, a plurality of circulation drainage driving motors are fixed in the driving accommodating shell, and the rotating shaft of the spiral conveying rod extends into the driving accommodating shell and is connected to the output shaft of the circulation drainage driving motor through a coupling.

[0013] Note: Using the circulation drainage method to transport and drain the raw materials is beneficial to improving the distillation efficiency.

[0014] Preferably, a multi-stage decompression control mechanism is provided on the outside of the distillation tank body, and the multi-stage decompression control mechanism comprises a decompression control accommodating shell fixed on the outside of the distillation tank body, and a plurality of decompression control tanks arranged in the decompression control accommodating shell;

[0015] A pressure reducing balance connecting pipe connected to the interior of the pressure reducing control tank is fixed on the pressure reducing balance connecting pipe, a pressure reducing balance control valve is provided on the pressure reducing balance connecting pipe, and the other end of the pressure reducing balance connecting pipe is connected to the interior of the end cover of the distillation tank;

[0016] A vacuum connecting pipe connected to the interior of the pressure reducing control tank is fixed on the pressure reducing control tank, and a vacuum connecting pipe is provided with a vacuum connecting control valve;

[0017] A vacuum pump is fixed in the decompression control housing, and the other end of the vacuum connecting pipe is connected to the input end of the vacuum pump.

[0018] Note: Under the coordinated control of the pressure reducing control tanks, the pressure control inside the distillation tank body is more precise.

[0019] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0020] 1. The utility model has a reasonable structural design and adopts a circulating drainage method to transport the raw materials to a high place and make the raw materials flow from top to bottom along each auxiliary distillation drainage plate, thereby increasing the evaporation area of ​​the raw materials and improving the distillation processing efficiency;

[0021] 2. The utility model is easy to operate. Each pressure reducing control tank is vacuumized in advance. When the pressure in the main body of the distillation tank needs to be controlled, the pressure reduction inside the main body of the distillation tank can be quickly controlled by opening the corresponding valve.

[0022] 3. The utility model makes the pressure control in the distillation tank body more accurate under the coordinated control of the pressure reducing control tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the front view of the utility model;

[0024] Figure 2 yes Figure 1 Top view of the .

[0025] In the figure, 10 is the main body of the distillation tank, 11 is the end cover of the distillation tank, 12 is the electric heating mechanism, 13 is the condensation recovery mechanism, 20 is the auxiliary distillation mechanism, 201 is the fixed connecting plate, 202 is the circulation gap, 21 is the auxiliary distillation diversion plate, 22 is the circulation diversion support cylinder, 23 is the circulation diversion pipe, 231 is the diversion input elbow, 232 is the diversion output elbow, 24 is the screw conveyor, 241 is the drive housing, 242 is the circulation diversion drive motor, 30 is the multi-stage pressure reduction control mechanism, 31 is the pressure reduction control housing, 32 is the pressure reduction control tank, 321 is the pressure reduction balance connecting pipe, 322 is the pressure reduction balance control valve, 323 is the vacuum connecting pipe, 324 is the vacuum connecting control valve, and 33 is the vacuum pump. Specific implementation mode

[0026] The following combines Figure 1 - Figure 2 to describe the present utility model in detail. For the convenience of narration, the orientation described below is stipulated as follows: the up, down, left, right, front, and back directions described below are consistent with the up, down, left, right, front, and back directions of the projection relationship of each main view or structural schematic diagram itself.

[0027] Embodiment:

[0028] A vacuum distillation device for preparing waterborne polyurethane, as Figure 1 shown, includes a distillation tank main body 10 with an upward opening, a distillation tank end cover 11 with a downward opening is hermetically connected to the top of the distillation tank main body 10, an electric heating mechanism 12 is fixed to the bottom of the distillation tank main body 10, and a condensation recovery mechanism 13 is installed inside the distillation tank main body 10;

[0029] The electric heating mechanism 12 and the condensation recovery mechanism 13 are prior arts;

[0030] An auxiliary distillation mechanism 20 is provided inside the distillation tank main body 10.

[0031] As Figure 1 shown, the auxiliary distillation mechanism 20 includes multiple auxiliary distillation diversion plates 21 fixed to the inner side wall of the distillation tank main body 10, and the auxiliary distillation diversion plates 21 are arranged to spiral extend around the vertical axis of the distillation tank main body 10;

[0032] As Figure 2 shown, the edges of the auxiliary distillation diversion plates 21 are fixedly connected to the inner side wall of the distillation tank main body 10 through multiple fixed connecting plates 201, and there is a circulation gap 202 between the edges of the auxiliary distillation diversion plates 21 and the inner side wall of the distillation tank main body 10.

[0033] As Figure 1As shown, a vertically extending circulating drainage support cylinder 22 is fixed to the inner bottom of the distillation tank main body 10. A plurality of vertically extending circulating drainage pipes 23 are fixed inside the circulating drainage support cylinder 22. The lower end of the circulating drainage pipe 23 is connected to the inside of the distillation tank main body 10 through a drainage input elbow 231, and the upper end of the circulating drainage pipe 23 is connected to the inside of the distillation tank main body 10 through a drainage output elbow 232;

[0034] The drainage input elbow 231 is placed at the inner bottom position of the distillation tank main body 10, and the drainage output elbows 232 are dispersedly placed above each auxiliary distillation drainage plate 21;

[0035] A spiral conveyor rod 24 is rotatably connected inside the circulating drainage pipe 23. A driving accommodation shell 241 is fixed to the top of the circulating drainage support cylinder 22. A plurality of circulating drainage driving motors 242 are fixed inside the driving accommodation shell 241. The rotating shaft of the spiral conveyor rod 24 extends into the driving accommodation shell 241 and is in transmission connection with the output shaft of the circulating drainage driving motor 242 through a coupling.

[0036] As Figure 1 shown, a multi-stage pressure reduction control mechanism 30 is provided outside the distillation tank main body 10. The multi-stage pressure reduction control mechanism 30 includes a pressure reduction control accommodation shell 31 fixed to the outside of the distillation tank main body 10 and a plurality of pressure reduction control tanks 32 arranged inside the pressure reduction control accommodation shell 31;

[0037] A pressure reduction balance communication pipe 321 connected to its inside is fixed to the pressure reduction control tank 32. A pressure reduction balance control valve 322 is provided on the pressure reduction balance communication pipe 321. The other end of the pressure reduction balance communication pipe 321 is connected to the inside of the distillation tank end cover 11;

[0038] A vacuum communication pipe 323 connected to its inside is fixed to the pressure reduction control tank 32. A vacuum communication control valve 324 is provided on the vacuum communication pipe 323;

[0039] As Figure 2 shown, a vacuum pump 33 is fixed inside the pressure reduction control accommodation shell 31. The other end of the vacuum communication pipe 323 is connected to the input end of the vacuum pump 33.

[0040] In the actual application process of the present utility model, the raw materials to be distilled are input into the distillation tank main body 10, and the distillation tank end cover 11 is tightly covered and fixed;

[0041] The raw materials in the distillation tank main body 10 are heated and distilled by the electric heating mechanism 12. During the distillation process, the auxiliary distillation mechanism 20 is used to circulate and convey the raw materials, which not only plays a stirring role but also improves the distillation efficiency. The raw materials enter the circulating drainage pipe 23 through the drainage input elbow 231. The circulating drainage drive motor 242 drives the spiral conveyor rod 24 to rotate. By the conveying action of the spiral conveyor rod 24, the raw materials are driven to flow upward in the circulating drainage pipe 23, and finally the raw materials are discharged through the drainage output elbow 232.

[0042] The raw materials discharged from the drainage output elbow 232 fall on the auxiliary distillation drainage plate 21 and flow downward along the auxiliary distillation drainage plate 21. A plurality of electric heating plates are fixedly arranged on the lower side of the auxiliary distillation drainage plate 21. The electric heating plates are used to heat and keep the auxiliary distillation drainage plate 21 warm, which is beneficial to maintaining the temperature of the raw materials. Finally, the raw materials return to the bottom inside the distillation tank main body 10. During this process, the evaporation area of the raw materials is increased, which is beneficial to further improving the distillation efficiency.

[0043] The vacuum pump 33 is used to pre-evacuate each pressure reduction control tank 32. There are multiple pressure sensors in the distillation tank main body 10 for real-time monitoring of the air pressure change in the distillation tank main body 10. By controlling the connection between the distillation tank main body 10 and the pressure reduction control tank 32 through each pressure reduction balance control valve 322, the pressure in the distillation tank main body 10 can be quickly adjusted to meet the actual production requirements.

Claims

1. A vacuum distillation device for preparing waterborne polyurethane, characterized in that: It comprises a distillation tank body (10) with an opening facing upward, the top of the distillation tank body (10) is sealedly connected to a distillation tank end cover (11) with an opening facing downward, an electric heating mechanism (12) is fixed to the bottom of the distillation tank body (10), and a condensation recovery mechanism (13) is installed in the distillation tank body (10); An auxiliary distillation mechanism (20) is provided in the distillation tank body (10).

2. A vacuum distillation device for preparing waterborne polyurethane according to claim 1, characterized in that: The auxiliary distillation mechanism (20) comprises a plurality of auxiliary distillation guide plates (21) fixed on the inner side wall of the distillation tank body (10), and the auxiliary distillation guide plates (21) are arranged to extend spirally around the vertical axis of the distillation tank body (10); The edge of the auxiliary distillation guide plate (21) is fixedly connected to the inner wall of the distillation tank body (10) through a plurality of fixed connecting plates (201), and a flow gap (202) is provided between the edge of the auxiliary distillation guide plate (21) and the inner wall of the distillation tank body (10).

3. A vacuum distillation device for preparing waterborne polyurethane according to claim 1, characterized in that: A vertically extending circulation drainage support cylinder (22) is fixed to the bottom of the distillation tank body (10), and a plurality of vertically extending circulation drainage pipes (23) are fixed inside the circulation drainage support cylinder (22); the lower ends of the circulation drainage pipes (23) are connected to the interior of the distillation tank body (10) through drainage input elbow pipes (231), and the upper ends of the circulation drainage pipes (23) are connected to the interior of the distillation tank body (10) through drainage output elbow pipes (232); A spiral conveying rod (24) is rotatably connected inside the circulation drainage tube (23); a driving accommodating shell (241) is fixed on the top of the circulation drainage support cylinder (22); a plurality of circulation drainage driving motors (242) are fixed inside the driving accommodating shell (241); a rotating shaft of the spiral conveying rod (24) extends into the driving accommodating shell (241) and is drivingly connected to an output shaft of the circulation drainage driving motor (242) via a coupling.

4. A vacuum distillation device for preparing waterborne polyurethane according to claim 1, characterized in that: A multi-stage decompression control mechanism (30) is provided outside the distillation tank body (10), and the multi-stage decompression control mechanism (30) comprises a decompression control accommodating shell (31) fixed outside the distillation tank body (10), and a plurality of decompression control tanks (32) arranged in the decompression control accommodating shell (31); A decompression balancing connecting pipe (321) connected to the interior of the decompression control tank (32) is fixed on the decompression balancing connecting pipe (321), a decompression balancing control valve (322) is provided on the decompression balancing connecting pipe (321), and the other end of the decompression balancing connecting pipe (321) is connected to the interior of the distillation tank end cover (11); A vacuum communication pipe (323) connected to the interior of the pressure reducing control tank (32) is fixed on the pressure reducing control tank (32), and a vacuum communication control valve (324) is provided on the vacuum communication pipe (323); A vacuum pump (33) is fixed inside the decompression control housing (31), and the other end of the vacuum connecting pipe (323) is connected to the input end of the vacuum pump (33).

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