A stirring device for emulsification in the production of waterborne polyurethane

Abstract

The utility model relates to the technical field of reaction kettle relates to a kind of stirring device for waterborne polyurethane production emulsification, it include: reaction kettle and stirring mechanism, the stirring mechanism includes the drive module being set on the reaction kettle and the stirring module being set in the reaction kettle, the drive module includes rotation setting the drive shaft one in the center of the reaction kettle and the drive shaft two being set in the both sides of the drive shaft one, drive tooth one is set on the drive shaft one and upper end is provided with drive motor, drive tooth two is set on the drive shaft two, the drive shaft two is engaged with adjacent the drive tooth two, the stirring module includes frame stirrer being set on the drive shaft one and dispersion stirrer being set on the drive shaft two.The utility model mixes by frame stirrer to raw material to be stirred in wide range, dispersion stirrer is then to material and carry out fine dispersion, and the synergic effect of both, to give consideration to dispersion efficiency and mixed shear uniformity.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, and specifically to a stirring device for emulsification in the production of waterborne polyurethane. Background Technology

[0002] Polyurethane is widely used in industrial fields, with applications including adhesives and surface coatings for various items. However, the use of polyurethane requires large amounts of organic solvents, causing serious environmental pollution. Based on environmental protection considerations, water-based polyurethane processing has become a development trend.

[0003] Currently, waterborne polyurethane production often employs a single stirring structure, namely a single or two sets of dispersion discs, along with baffles added inside the reactor to increase shearing during the emulsification process and thus increase emulsification efficiency. However, for some products with high viscosity or slow phase transition, traditional stirring and shearing methods are often ineffective, resulting in large batch-to-batch variations, manifested in large differences in dispersion particle size and finished resin viscosity. Utility Model Content

[0004] This invention addresses the problems of existing technologies by providing a stirring device for emulsifying waterborne polyurethane production.

[0005] The objective of this utility model can be achieved through the following technical solution: A stirring device for emulsification in the production of waterborne polyurethane, comprising: a reaction vessel and a stirring mechanism, wherein the stirring mechanism includes a drive module disposed on the reaction vessel and a stirring module disposed inside the reaction vessel, the drive module includes a drive shaft 1 rotatably disposed at the center of the reaction vessel and drive shafts 2 disposed on both sides of the drive shaft 1, the drive shaft 1 is provided with drive teeth 1 and a drive motor is disposed at the upper end, the drive shaft 2 is provided with drive teeth 2, the drive shaft 2 meshes with the adjacent drive teeth 2, and the stirring module includes a frame stirrer disposed on the drive shaft 1 and a dispersing stirrer disposed on the drive shaft 2.

[0006] In a further improvement, the dispersing agitator includes a serrated disc body, a lower clamping plate, a jacket, and an upper clamping plate. The serrated disc body is sleeved on the second drive shaft. The upper and lower clamping plates are respectively disposed on the upper and lower sides of the serrated disc body and fixed by bolts. The jacket includes an outer jacket embedded in the upper clamping plate and an inner jacket slidably disposed inside the outer jacket. The contact surfaces of the outer and inner jackets are inclined and adjusted by bolts.

[0007] In a further improvement, a circulation mechanism is provided on the side of the reactor. The circulation mechanism includes a circulation pipe connected to the pipes at the upper and lower ends of the reactor and a circulation pump installed on the circulation pipe.

[0008] As a further improvement, the reactor is provided with a feed inlet and a discharge pipe at the lower end.

[0009] In a further improvement, a support base is provided inside the reactor, a filter screen is provided on the side of the support base and the lower end is connected to the discharge pipe, and the lower end of the drive shaft is rotatably mounted on the upper end of the support base.

[0010] In a further improvement, the frame mixer is provided in two sets, with the included angle between the two sets of frame mixers being a right angle and the cross-section being a square.

[0011] Compared with existing technologies, this invention has the following advantages: In actual use, various raw materials required for the production of waterborne polyurethane are first added to the reactor. Then, the drive motor is started, which drives drive shaft one to rotate. Drive gear one on drive shaft one meshes with drive gear two, driving drive shaft two to rotate synchronously, thereby enabling the frame agitator and the dispersion agitator to work simultaneously. The frame agitator performs large-scale stirring and mixing of the raw materials, while the dispersion agitator performs fine dispersion of the materials. The two work together to ensure that the waterborne polyurethane raw materials are fully mixed and emulsified in the reactor, ultimately obtaining a uniform and stable waterborne polyurethane emulsion. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a top view of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of the dispersion mixer of this utility model;

[0015] Figure 4 This is a cross-sectional view of the dispersion mixer of this utility model.

[0016] In the diagram, 1. Reactor; 11. Feed inlet; 12. Discharge pipe; 13. Support base; 2. Stirring mechanism; 21. Drive module; 211. Drive shaft one; 2111. Drive gear one; 2112. Drive motor; 212. Drive shaft two; 2121. Drive gear two; 22. Stirring module; 221. Frame agitator; 222. Dispersing agitator; 2221. Serrated disc; 2222. Lower clamping plate; 2223. Jacket; 22231. Outer clamping plate; 22232. Inner clamping plate; 2224. Upper clamping plate; 3. Circulation mechanism; 31. Circulation pipe; 32. Circulation pump. Detailed Implementation

[0017] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The following describes the embodiments and appendices. Figures 1-4 The technical solution of this utility model will be further described below.

[0020] Example 1

[0021] A stirring device for emulsification in the production of waterborne polyurethane includes: a reaction vessel 1 and a stirring mechanism 2. The stirring mechanism 2 includes a drive module 21 disposed on the reaction vessel 1 and a stirring module 22 disposed inside the reaction vessel 1. The drive module 21 includes a drive shaft 211 rotatably disposed at the center of the reaction vessel 1 and drive shafts 212 disposed on both sides of the drive shaft 211. The drive shaft 211 is provided with drive teeth 2111 and a drive motor 2112 is disposed at its upper end. The drive shaft 212 is provided with drive teeth 2121 and meshes with the adjacent drive teeth 2121. The stirring module 22 includes a frame stirrer 221 disposed on the drive shaft 211 and a dispersing stirrer 222 disposed on the drive shaft 212.

[0022] like Figures 1-4 As shown, in actual use, the various raw materials required for the production of waterborne polyurethane are first added to the reactor 1. Then, the drive motor 2112 is started, which drives the drive shaft 211 to rotate. The drive gear 2111 on the drive shaft 211 meshes with the drive gear 2121, causing the drive shaft 212 to rotate synchronously. This causes the frame agitator 221 and the dispersing agitator 222 to work simultaneously. The frame agitator 221 agitates and mixes the raw materials over a wide range, while the dispersing agitator 222 finely disperses the materials. The two work together to ensure that the waterborne polyurethane raw materials are fully mixed and emulsified in the reactor 1, ultimately resulting in a uniform and stable waterborne polyurethane emulsion.

[0023] As a further preferred embodiment, the dispersing agitator 222 includes a serrated disc body 2221, a lower clamping disc 2222, a clamping sleeve 2223, and an upper clamping disc 2224. The serrated disc body 2221 is sleeved on the drive shaft 212. The upper clamping disc 2224 and the lower clamping disc 2222 are respectively disposed on the upper and lower sides of the serrated disc body 2221 and fixed by bolts. The clamping sleeve 2223 includes an outer clamping sleeve 22231 embedded in the upper clamping disc 2224 and an inner clamping sleeve 22232 slidably disposed inside the outer clamping sleeve 22231. The contact surfaces of the outer clamping sleeve 22231 and the inner clamping sleeve 22232 are inclined and adjusted by bolts.

[0024] Specifically, the dispersing agitator 222 is fixedly mounted on the drive shaft 212 by means of a jacket, which facilitates subsequent disassembly and maintenance. At the same time, the installation position of the dispersing agitator 222 can be adjusted according to the actual process parameters, so as to achieve the best effect of the dispersing agitator 222.

[0025] Alternatively, each set of drive shaft 212 is equipped with two sets of dispersing agitators 222. The diameter of the serrated disc 2221 is 0.3 times the inner diameter of the reactor. The outer side of the upper disc is provided with long teeth at an inclination angle of 45°, and the outer side of the lower disc is provided with short teeth at an inclination angle of 90°. The combination of long and short teeth with different inclination angles further improves the stirring effect.

[0026] As a further preferred embodiment, a circulation mechanism 3 is provided on the side of the reactor 1. The circulation mechanism 3 includes a circulation pipe 31 connected to the pipes at the upper and lower ends of the reactor 1 and a circulation pump 32 provided on the circulation pipe 31.

[0027] Specifically, through the setting of the circulation mechanism 3, the material forms a circulating flow in the reactor 1, which further improves the uniformity and efficiency of stirring. The circulation pump 32 drives the material to flow in the circulation pipe 31, so that the material is constantly renewed during the stirring process, avoiding the problem of local concentration being too high or too low, and ensuring the stability of the emulsification process and the consistency of product quality.

[0028] As a further preferred embodiment, the reactor 1 is provided with a feed inlet 11 and a discharge pipe 12 at its lower end. A support base 13 is provided inside the reactor 1. A filter screen is provided on the side of the support base 13 and its lower end is connected to the discharge pipe 12. The lower end of the drive shaft 211 is rotatably mounted on the upper end of the support base 13.

[0029] Specifically, a filter screen is provided on the side of the support base 13 to filter the material, remove impurities, and ensure product quality. The lower end of the support base 13 is connected to the discharge pipe 12 so that the filtered material can be discharged smoothly. The lower end of the drive shaft 211 is rotatably set on the upper end of the support base 13 to ensure the stability of the stirring mechanism 2 during operation.

[0030] As a further preferred embodiment, the frame stirrer 221 is provided in two sets, with the included angle between the two sets of frame stirrers 221 being a right angle and the cross-section being a square, thereby further improving the stirring and mixing efficiency.

[0031] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A stirring device for emulsifying waterborne polyurethane production, characterized in that, include: A reaction vessel and a stirring mechanism, the stirring mechanism including a drive module disposed on the reaction vessel and a stirring module disposed inside the reaction vessel, the drive module including a drive shaft 1 rotatably disposed at the center of the reaction vessel and drive shaft 2 disposed on both sides of the drive shaft 1, the drive shaft 1 being provided with drive teeth 1 and a drive motor disposed at the upper end, the drive shaft 2 being provided with drive teeth 2, the drive shaft 2 meshing with the adjacent drive teeth 2, the stirring module including a frame stirrer disposed on the drive shaft 1 and a dispersing stirrer disposed on the drive shaft 2.

2. The stirring device for emulsification in the production of waterborne polyurethane according to claim 1, characterized in that, The dispersing agitator includes a serrated disc body, a lower clamping plate, a jacket, and an upper clamping plate. The serrated disc body is sleeved on the second drive shaft. The upper and lower clamping plates are respectively disposed on the upper and lower sides of the serrated disc body and fixed by bolts. The jacket includes an outer jacket embedded in the upper clamping plate and an inner jacket slidably disposed inside the outer jacket. The contact surfaces of the outer and inner jackets are inclined and adjusted by bolts.

3. The stirring device for emulsification in the production of waterborne polyurethane according to claim 1, characterized in that, The reactor is provided with a circulation mechanism on its side. The circulation mechanism includes a circulation pipe connected to the pipes at the upper and lower ends of the reactor and a circulation pump installed on the circulation pipe.

4. The stirring device for emulsification in the production of waterborne polyurethane according to claim 1, characterized in that, The reactor is equipped with a feed inlet and a discharge pipe at the bottom.

5. A stirring device for emulsifying waterborne polyurethane production according to claim 4, characterized in that, The reactor is equipped with a support base inside. A filter screen is provided on the side of the support base and its lower end is connected to the discharge pipe. The lower end of the drive shaft is rotatably mounted on the upper end of the support base.

6. The stirring device for emulsification in the production of waterborne polyurethane according to claim 1, characterized in that, The frame stirrer is provided in two sets, and the angle between the two sets of frame stirrers is a right angle and the cross-section is square.

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