Aqueous polyurethane dispersion prepreg device

Abstract

The utility model relates to a kind of waterborne polyurethane dispersion pre-polymerization device, including support frame, speed reducer motor, support frame is installed from top to bottom sequentially installed four reaction cylinders, the top of each reaction cylinder is equipped with a feed pipe, the bottom of each reaction cylinder is equipped with a discharge pipe, a valve whether the discharge pipe is discharged is installed on each discharge pipe, the feed pipe of arbitrary one reaction cylinder is communicated with the valve on the discharge pipe of the reaction cylinder adjacent above it;A set of stirring paddle is rotatably installed in each reaction cylinder, the power output shaft of speed reducer motor is connected with one set of stirring paddle by coupling, and any two adjacent stirring paddles are driven connected by synchronous belt transmission pair;A temperature control switch and an electric heating jacket are installed on each reaction cylinder, and the wiring terminal of temperature control switch is connected with the power cord of electric heating jacket.The beneficial effect is: reduce the heat energy waste in the heating, cooling process of reaction cylinder itself in raw material repeatedly.

Description

Technical Field

[0001] This utility model relates to the field of waterborne polyurethane dispersion production equipment, and in particular to a waterborne polyurethane dispersion prepolymerization device. Background Technology

[0002] Waterborne polyurethane dispersions are environmentally friendly polymer materials synthesized through specific chemical processes. They are stably dispersed in aqueous solutions and do not contain traditional emulsifiers. Stable dispersion in waterborne polyurethane dispersions is achieved through the self-emulsifying properties of polyurethane prepolymers or ionic monomers.

[0003] The production process of prepolymers for waterborne polyurethane dispersions requires repeated heating and cooling. Existing prepolymer production takes place in a reactor, which wastes a lot of heat energy during the repeated heating and cooling process. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned problems in the existing technology and provide a waterborne polyurethane dispersion prepolymerization device.

[0005] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0006] A waterborne polyurethane dispersion prepolymerization device includes a support frame and a geared motor.

[0007] Four reaction cylinders are installed on the support frame from top to bottom. Each reaction cylinder has a feed pipe at the top and a discharge pipe at the bottom. Each discharge pipe is equipped with a valve to control whether the discharge pipe discharges material. The feed pipe of any reaction cylinder is connected to the valve on the discharge pipe of the reaction cylinder above it.

[0008] Each of the reaction cylinders is rotatably installed with a set of stirring paddles, and the power output shaft of the geared motor is connected to one of the sets of stirring paddles through a coupling. Any two adjacent sets of stirring paddles are connected by a synchronous belt drive pair.

[0009] Each of the reaction cylinders is equipped with a temperature control switch and an electric heating mantle, and the terminals of the temperature control switch are connected to the power cord of the electric heating mantle.

[0010] The four reaction cylinders are named reaction cylinder one, reaction cylinder two, reaction cylinder three, and reaction cylinder four from top to bottom, and the valves installed on the discharge pipes of the four reaction cylinders are named valve one, valve two, valve three, and valve four from top to bottom.

[0011] Among them, a feed branch pipe is provided on one side of the feed pipe of the reaction cylinder three, and a valve five is installed on the feed branch pipe.

[0012] The stirring impeller includes a stirring shaft and N stirring blades with a fan-shaped cross-section. The N stirring blades are arranged in a spiral pattern on the stirring shaft. The centrifugal side of one end of each stirring blade is welded to the stirring shaft. The grooved surface of each stirring blade faces the direction of rotation of the stirring blade. A reinforcing rib is welded between the centrifugal side of each stirring blade and the stirring shaft.

[0013] The reaction cylinder includes a cylindrical body and two annular end caps. The two end caps are bolted to both ends of the cylinder. Each end cap has a bearing mounting groove in the middle, and a waterproof sealing bearing is installed in each bearing mounting groove. The outer ring of the waterproof sealing bearing is interference-fitted with the bearing mounting groove. The two ends of the stirring shaft are respectively fitted into the inner rings of the two waterproof sealing bearings, and a sealing ring is sandwiched between the stirring shaft and the inner ring of the waterproof sealing bearing.

[0014] Each set of synchronous belt drive pairs includes a driving synchronous pulley, a driven synchronous pulley, and a synchronous belt. The driving synchronous pulley and the driven synchronous pulley are respectively keyed to the same end of two adjacent stirring shafts. The synchronous belt meshes with the driving synchronous pulley and the driven synchronous pulley that are adjacent to each other.

[0015] The support frame includes two T-shaped fixed frames and two T-shaped movable frames. Multiple connecting rods are evenly distributed from top to bottom between the two fixed frames. The fixed frames have four semi-circular rear mounting slots arranged sequentially from top to bottom on the side near the movable frames. The movable frames have four semi-circular front mounting slots arranged sequentially from top to bottom on the side near the fixed frames. The reaction cylinder is installed between adjacent and connected rear mounting slots and front mounting slots.

[0016] Preferably, a connecting block is fixed to the rear side of the reaction cylinder, and the connecting block is bolted to the fixed frame.

[0017] The geared motor has a motor bracket installed at its bottom, and the motor bracket is located on one side of the support frame.

[0018] The beneficial effects of this utility model are: by setting four reaction cylinders and using an electric heating jacket to independently heat each reaction cylinder, the heating temperature of the four reaction cylinders can be set according to the reaction process requirements of the prepolymer, so that the raw materials can react sequentially in the four reaction cylinders, reducing the heat energy waste of the reaction cylinders themselves during the repeated heating and cooling of the raw materials. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a three-dimensional structural diagram of the prepolymer device in this utility model, viewed from the front side.

[0021] Figure 2 This is a front view schematic diagram of the prepolymerization device in this utility model;

[0022] Figure 3 This is a three-dimensional structural diagram of the support frame as viewed from the front side in this utility model;

[0023] Figure 4 This is a three-dimensional structural diagram of the reaction cylinder in this utility model, viewed from the lower side.

[0024] Figure 5 This is a three-dimensional structural diagram of the stirring paddle in this utility model, viewed from the lower side.

[0025] Figure 6 This is a three-dimensional structural diagram of the temperature control switch in this utility model;

[0026] Explanation of the numbers in the diagram: Support frame 1, Fixed frame 11, Movable frame 12, Connecting rod 13, Rear mounting slot 14, Front mounting slot 15.

[0027] Gear motor 2, motor bracket 21

[0028] Reactor 3, Reactor 1 31, Reactor 2 32, Reactor 3 33, Reactor 4 34, Cylinder body 35, End cap 36, Bearing mounting groove 361, Waterproof sealed bearing 362, Sealing ring 363, Connecting block 37, Feed pipe 38, Feed branch pipe 381, Discharge pipe 39

[0029] Valve 4, Valve 1 41, Valve 2 42, Valve 3 43, Valve 44, Valve 5 45

[0030] 5. Mixing paddle; 51. Mixing shaft; 52. Mixing blades; 53. Reinforcing ribs.

[0031] Coupling 6

[0032] 7. Synchronous belt drive pair; 71. Driving synchronous belt pulley; 72. Driven synchronous belt pulley; 73. Synchronous belt.

[0033] Temperature control switch 8

[0034] Electric heating jacket 9. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 6 As shown, a waterborne polyurethane dispersion prepolymerization device includes a support frame 1 and a geared motor 2. The support frame 1 includes two T-shaped fixed frame bodies 11 and two T-shaped movable frame bodies 12. Four connecting rods 13, evenly distributed from top to bottom, are welded between the two fixed frame bodies 11. Four semi-circular rear mounting slots 14, arranged sequentially from top to bottom, are provided on the side of the fixed frame body 11 near the movable frame body 12. Four semi-circular front mounting slots 15, arranged sequentially from top to bottom, are provided on the side of the movable frame body 12 near the fixed frame body 11. A motor bracket 21 is mounted on the bottom of the geared motor 2, and the motor bracket 21 is located on one side of the support frame 1.

[0037] Four reaction cylinders 3 are installed on the support frame 1 from top to bottom. The four reaction cylinders 3 are reaction cylinder one 31, reaction cylinder two 32, reaction cylinder three 33 and reaction cylinder four 34 from top to bottom. The reaction cylinders are installed between the adjacent and connected rear mounting slot 14 and front mounting slot 15.

[0038] The reaction cylinder 3 includes a cylindrical body 35 and two annular end caps 36. The two end caps 36 are respectively bolted to both ends of the cylinder 35, and a rubber sealing gasket is sandwiched between the end caps 36 and the cylinder 35.

[0039] A vertically upward vent pipe can also be installed at the top of the cylinder 35. The vent pipe is connected to a gas storage tank containing protective gas (such as nitrogen) through a gas supply pipe, and is used to introduce protective gas into the cylinder.

[0040] To facilitate the installation and disassembly of the four reaction cylinders 3, a connecting block 37 is fixedly connected to the rear side of the reaction cylinder 3. The connecting block 37 is bolted to the fixed frame 11. Specifically, the connecting block 37 is welded to the rear side of the cylinder 35.

[0041] Each reaction cylinder 3 has a feed pipe 38 at the top and a discharge pipe 39 at the bottom. Each discharge pipe 39 is equipped with a valve 4 to control whether the discharge pipe 39 discharges material. The valves 4 installed on the discharge pipes 39 of the four reaction cylinders 3 are valve one 41, valve two 42, valve three 43, and valve four 44 from top to bottom.

[0042] The valve 4 is connected to the feed pipe 38 and the valve is connected to the discharge pipe 39 by flanges, and rubber gaskets are sandwiched between the valve 4 and the feed pipe 38 and the discharge pipe 39.

[0043] The feed pipe 38 of any reaction cylinder 3 is connected to the valve 4 on the discharge pipe 39 of the adjacent reaction cylinder 3 above it.

[0044] A feed branch pipe 381 is provided on one side of the feed pipe 38 of the reaction cylinder 33. A valve 45 is installed on the feed branch pipe 381. The valve 45 is connected to a raw material tank through a conveying pipe. The raw materials required for the prepolymer production process are added to the reaction cylinder 33 by opening the valve 45.

[0045] Each reaction cylinder 3 is rotatably installed with a set of stirring blades 5. The stirring blades 5 include a stirring shaft 51 and 30 stirring blades 52 with a fan-shaped cross-section. The 30 stirring blades 52 are arranged in a spiral on the stirring shaft 51. The centrifugal side of one end of the stirring blade 52 is welded to the stirring shaft 51. The grooved surface of the stirring blade 52 faces the direction of rotation of the stirring blade 52, that is, the grooved surface of the stirring blade 52 faces the direction of rotation of the power output shaft of the geared motor. A reinforcing rib plate 53 is welded between the centrifugal side of the stirring blade 52 and the stirring shaft 51.

[0046] The impeller 5 is installed in the reaction cylinder 3 in the following manner: a bearing mounting groove 361 is provided in the middle of each end cover 36, and a waterproof sealing bearing 362 is installed in each bearing mounting groove 361, with the outer ring of the waterproof sealing bearing 362 having an interference fit with the bearing mounting groove 361; the two ends of the stirring shaft 51 are respectively fitted into the inner rings of the two waterproof sealing bearings 362, and a sealing ring 363 is sandwiched between the stirring shaft 51 and the inner ring of the waterproof sealing bearing 362; the diameter of the middle part of the stirring shaft 51 is larger than the diameter of the two ends of the stirring shaft 51, and a circular step is formed at the junction of the middle part of the stirring shaft 51 and the two ends of the stirring shaft 51; the sealing ring 363 is sandwiched between the step and the inner ring of the waterproof sealing bearing 362; the diameter of the two ends of the stirring shaft 51 is equal to the inner diameter of the inner ring of the waterproof sealing bearing 362.

[0047] The power output shaft of the geared motor 2 is connected to one of the sets of agitators 5 via a coupling 6. In this embodiment, the power output shaft of the geared motor 2 is connected to one end of the agitator shaft 51 of the agitator 5 installed in the reaction cylinder 34 via a coupling 6.

[0048] Any two adjacent sets of agitators 5 are connected by a synchronous belt drive pair 7. Each set of synchronous belt drive pairs 7 includes a driving synchronous pulley 71, a driven synchronous pulley 72, and a synchronous belt 73. The driving synchronous pulley 71 and the driven synchronous pulley 72 are respectively keyed to the same end of two adjacent agitator shafts 51. The synchronous belt 73 meshes with the driving synchronous pulley 71 and the driven synchronous pulley 72 that are adjacent to each other.

[0049] Each reaction chamber 3 is equipped with a temperature control switch 8 and an electric heating jacket 9. The terminals of the temperature control switch 8 are connected to the power supply line of the electric heating jacket 9. Specifically, the two terminals of the temperature control switch 8 are connected in series with the neutral wire of the electric heating jacket 9. When the temperature control switch 8 is closed, the neutral wire and the live wire of the electric heating jacket 9 are connected, allowing current to flow for heating. When the temperature control switch 8 is open, the neutral wire and the live wire of the electric heating jacket 9 are disconnected, preventing current from flowing and stopping the heating jacket 9.

[0050] In this embodiment, an H301 normally closed temperature control switch is used, with its stud-shaped temperature sensor screwed onto the cylinder body. The appropriate temperature control switch is selected based on the prepolymer production process of the waterborne polyurethane dispersion. Specifically, the temperature control switch installed on reaction cylinder one has a controlled temperature of 50°C, the temperature control switch installed on reaction cylinder two has a controlled temperature of 80°C, the temperature control switch installed on reaction cylinder three has a controlled temperature of 60°C, and the temperature control switch installed on reaction cylinder four has a controlled temperature of 80°C.

[0051] In this embodiment, the electric heating jacket uses a silicone rubber heating sheet, which wraps around the middle of the reaction cylinder. The silicone rubber heating sheet is fixed to the reaction cylinder with cable ties or straps.

[0052] In this embodiment, valves 1, 2, 3, 4, and 5 are all ball valves.

[0053] The geared motor selected is a horizontal geared motor with an output speed of 15 revolutions per minute.

[0054] Work process:

[0055] Before production, close valves 1, 2, 3, 4, and 5;

[0056] Bisphenol A type polyether polyol and catalyst are added to reaction cylinder one through the feed pipe. When the raw material temperature in reaction cylinder one reaches 50°C, diisocyanate is added to reaction cylinder one through the feed pipe.

[0057] Open valve one to discharge the raw material in reaction cylinder one into reaction cylinder two. The raw material is heated to 80°C and reacted in reaction cylinder two for 1.5 hours.

[0058] Open valve two to discharge the raw material in reaction cylinder two into reaction cylinder three. The raw material is cooled to 60°C in reaction cylinder three. Then open valve five to add the crystalline dimer acid type polyester polyol into reaction cylinder three.

[0059] Open valve three to discharge the raw material in reaction cylinder three into reaction cylinder four. The raw material is heated to 80°C and reacted in reaction cylinder four for 1.5 hours.

[0060] Open valve four, with the outlet end of valve four facing the dispersion reactor of the waterborne polyurethane dispersion, and discharge the prepolymer in reaction cylinder four into the dispersion reactor.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An aqueous polyurethane dispersion prepoly device characterized by: Includes support frame and geared motor. Four reaction cylinders are installed on the support frame from top to bottom. Each reaction cylinder has a feed pipe at the top and a discharge pipe at the bottom. Each discharge pipe is equipped with a valve to control whether the discharge pipe discharges material. The feed pipe of any reaction cylinder is connected to the valve on the discharge pipe of the reaction cylinder above it. Each of the reaction cylinders is rotatably installed with a set of stirring paddles, and the power output shaft of the geared motor is connected to one of the sets of stirring paddles through a coupling. Any two adjacent sets of stirring paddles are connected by a synchronous belt drive pair. Each of the reaction cylinders is equipped with a temperature control switch and an electric heating mantle, and the terminals of the temperature control switch are connected to the power cord of the electric heating mantle.

2. The pre-polymerization apparatus of claim 1, wherein: The four reaction cylinders are named reaction cylinder one, reaction cylinder two, reaction cylinder three, and reaction cylinder four from top to bottom. The valves installed on the discharge pipes of the four reaction cylinders are named valve one, valve two, valve three, and valve four from top to bottom.

3. The pre-polymerization apparatus of claim 2, wherein: A feed branch pipe is provided on one side of the feed pipe of the reaction cylinder three, and a valve five is installed on the feed branch pipe.

4. The pre-aggregation device of claim 1, wherein: The stirring impeller includes a stirring shaft and N stirring blades with a fan-shaped cross-section. The N stirring blades are arranged in a spiral pattern on the stirring shaft. The centrifugal side of one end of each stirring blade is welded to the stirring shaft. The grooved surface of each stirring blade faces the direction of rotation of the stirring blade. A reinforcing rib is welded between the centrifugal side of each stirring blade and the stirring shaft.

5. The pre-polymerization apparatus of claim 4, wherein: The reaction vessel includes a cylindrical body and two annular end caps. The two end caps are bolted to both ends of the body. Each end cap has a bearing mounting groove in the middle, and a waterproof sealing bearing is installed in each bearing mounting groove. The outer ring of the waterproof sealing bearing is interference-fitted with the bearing mounting groove. The two ends of the stirring shaft are respectively fitted into the inner rings of the two waterproof sealing bearings, and a sealing ring is sandwiched between the stirring shaft and the inner ring of the waterproof sealing bearing.

6. The pre-polymerization apparatus of claim 4, wherein: Each set of synchronous belt drive pairs includes a driving synchronous pulley, a driven synchronous pulley, and a synchronous belt. The driving and driven synchronous pulleys are keyed to the same end of two adjacent stirring shafts, and the synchronous belt meshes with the driving and driven synchronous pulleys that are adjacent to each other.

7. The pre-aggregation device of claim 1, wherein: The support frame includes two T-shaped fixed frames and two T-shaped movable frames. Multiple connecting rods evenly distributed from top to bottom are installed between the two fixed frames. The fixed frames have four semi-circular rear mounting slots arranged sequentially from top to bottom on the side near the movable frames. The movable frames have four semi-circular front mounting slots arranged sequentially from top to bottom on the side near the fixed frames. The reaction cylinder is installed between adjacent and connected rear mounting slots and front mounting slots.

8. The pre-polymerization apparatus of claim 7, wherein: A connecting block is fixed to the rear side of the reaction cylinder, and the connecting block is bolted to the fixed frame.

9. The pre-aggregation device of claim 1, wherein: A motor bracket is installed at the bottom of the geared motor, and the motor bracket is located on one side of the support frame.

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