homogenizing emulsifier

Abstract

The utility model provides a kind of homogenizer, including homogenizer, filter box, homogenizer is set on base, and homogenizer includes drive motor and working cavity, and the front end of drive motor is connected with rotating shaft transmission by connecting portion, and rotating shaft extends to working cavity and is fixedly connected with impeller, and working cavity is equipped with the stator around impeller;Metal filter frame is installed in filter box, and filtered material flows out from the filter outlet of filter box, and filter outlet is communicated with the inlet of working cavity, and the filter inlet of filter box is connected with the outlet pipeline of three-way electromagnetic valve;The first electromagnetic valve inlet pipeline of three-way electromagnetic valve is connected with the inlet pipe pipeline of water tank.The utility model, by setting homogenizer between reaction kettle and dispersion kettle, prepolymers can be high-speed pre-dispersed in water, to avoid uneven dispersion, stirring dead angle and other problems caused by too high viscosity when directly entering dispersion kettle.

Description

Technical Field

[0001] This utility model relates to the field of waterborne polyurethane pre-dispersion technology, specifically a homogenizing emulsifier. Background Technology

[0002] In the production and processing of waterborne polyurethane materials, the raw materials are typically first subjected to a prepolymerization reaction in a reactor to generate polyurethane prepolymers with specific molecular weights and viscosities. After the reaction is complete, these prepolymers are transported through pipelines to a dispersion tank, where they are mixed with a dispersion medium and dispersed.

[0003] However, for high-viscosity, difficult-to-disperse polyurethane prepolymers, existing technologies relying solely on dispersion tanks have significant shortcomings. On the one hand, high-viscosity prepolymers have poor flowability and are prone to agglomeration or dead zones due to uneven distribution of stirring force within the dispersion tank, resulting in poor material dispersion uniformity and difficulty in achieving ideal homogenization. On the other hand, to disperse high-viscosity materials, the dispersion tank needs to maintain high-intensity stirring for extended periods, which not only increases equipment energy consumption and wear on stirring components but may also cause abnormal temperature increases in the material due to localized frictional heat generation, affecting the physical and chemical stability of the final dispersion and thus reducing the quality of the final product. Utility Model Content

[0004] The purpose of this invention is to provide a homogenizing emulsifier to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A homogenizing emulsifier, comprising:

[0007] A homogenizing emulsifier is mounted on a base. The homogenizing emulsifier includes a drive motor and a working chamber. The front end of the drive motor is connected to a rotating shaft via a connecting part. The rotating shaft extends into the working chamber and is fixedly connected to an impeller. A stator surrounding the impeller is provided in the working chamber. Polyurethane prepolymer enters through the feed port of the working chamber and is sucked into the shear gap under the centrifugal force of the impeller for shearing the waterborne polyurethane prepolymer.

[0008] The filter box contains a metal filter frame. The polyurethane prepolymer enters through the filter inlet of the filter box and is filtered by the metal filter frame to remove impurities. The filtered material flows out through the filter outlet of the filter box. The filter outlet is connected to the feed inlet of the working chamber. The filter inlet of the filter box is connected to the outlet pipe of the three-way solenoid valve.

[0009] The inlet pipe of the first solenoid valve of the three-way solenoid valve is connected to the inlet pipe of the water tank.

[0010] Preferably, the lower end of the left filter frame is lower than the upper end of the right filter frame, and the lower end of the filter frame is lower than the height of the filter inlet. The filter inlet is located at the top of the left side of the filter box. This inclined structure can use the weight of the material to make the filtered material flow towards the upper end of the filter frame, reducing the retention and accumulation of material at the lower end of the filter frame and playing a role in preventing blockage. The upper end of the filter frame covers the filter outlet, ensuring that all the material filtered by the metal filter frame can flow out from the filter outlet, while impurities are intercepted and retained in the filter frame, ensuring the cleanliness of the material entering the working chamber.

[0011] Preferably, the top of the filter box is detachably equipped with a cover, which is fixedly connected to the top of the filter box by bolts. This structural design allows the cover to be easily opened or closed. When the filtration efficiency of the metal filter frame decreases due to the accumulation of impurities during long-term filtration, the operator can quickly remove the bolts to open the cover and clean, remove impurities, or replace the metal filter frame. The bottom of the filter box is fixedly connected to the base through a bottom bracket, providing stable support and preventing the filter box from shifting or shaking due to vibration during material conveying and filtration. The reasonable height design also ensures that the filter box is in a suitable installation position, ensuring that the material flows smoothly through the metal filter frame under the action of gravity.

[0012] Preferably, the water tank is mounted above the water inlet pipe via a U-shaped bracket. The elevation creates a natural pressure difference in the water level inside the tank. The water tank has an inlet on its side and an outlet at its bottom. The outlet is connected to the water inlet pipe, which is connected to a plunger pump. This pump can simultaneously pump water and polyurethane prepolymer into the working chamber of the homogenizing emulsifier via a three-way solenoid valve for pre-dispersion treatment of the waterborne polyurethane prepolymer. When it is necessary to clean the filter box or cool the homogenizing emulsifier, the plunger pump can pressurize the water in the tank and deliver it through the water inlet pipe. The high-pressure water flow can be sent into the filter box to rinse the metal filter frame and remove residual impurities. This water can also be introduced into the working chamber of the homogenizing emulsifier through pipelines to cool and dissipate heat, ensuring stable operation of the equipment at a suitable temperature.

[0013] Preferably, the impeller has multiple raised shearing teeth distributed circumferentially, which can cooperate with the stator to form a strong shearing effect when the impeller rotates at high speed. The front end face of the connecting part is provided with support rods spaced circumferentially. The end of the support rod away from the connecting part is fixedly connected to the fixing plate. The fixing plate is set in the working cavity and is coaxial with the rotating shaft. The stator is fixed to the front end face of the fixing plate, so that the stator and the impeller are kept concentric. A shearing gap is formed between the stator and the impeller to ensure that the polyurethane prepolymer can be subjected to uniform and efficient shearing treatment when flowing through the gap.

[0014] Preferably, the motor is fixedly connected to the upper surface of the base via a bottom motor mounting bracket, the connecting part is covered by a first protective shell, and a second protective shell is provided between the first protective shell and the working cavity to protect the support rod and the rotating shaft.

[0015] Preferably, the top of the working chamber is provided with a discharge port, which is sealed to the inlet pipe of the dispersion vessel through a discharge pipe. A second heat insulation sleeve is provided on the outer peripheral wall of the discharge pipe, which can keep the polyurethane prepolymer after shearing treatment in the working chamber warm during the transportation process, avoid the material viscosity from increasing due to a sudden drop in temperature, and affect the subsequent further processing in the dispersion vessel, while reducing heat loss.

[0016] Preferably, the inlet pipe of the second solenoid valve of the three-way solenoid valve is sealed to the outlet at the bottom of the reactor through a feed pipe. A melt pump is connected in series on the feed pipe to stably transport the polyurethane prepolymer in the reactor to the filter box. The outer peripheral wall of the feed pipe is fitted with a first heat insulation sleeve to reduce heat loss of the material during the transportation process, maintain the appropriate viscosity of the polyurethane prepolymer, and ensure its smooth flow through the feed pipe and subsequent filtration and shearing processes.

[0017] Compared with existing technologies, the beneficial effects of this utility model are:

[0018] This invention utilizes a homogenizing emulsifier installed between the reaction vessel and the dispersion vessel. The high-speed shearing action of the impeller and stator pre-disperses the high-viscosity polyurethane prepolymer, allowing for high-speed pre-dispersion in water. This reduces local viscosity differences and avoids problems such as uneven dispersion and dead zones caused by excessive viscosity when directly introduced into the dispersion vessel. Simultaneously, it reduces the stirring load on the dispersion vessel, shortens the dispersion time, and lowers the risk of localized overheating caused by prolonged high-intensity stirring, thus ensuring product stability.

[0019] This invention utilizes a three-way solenoid valve to switch between the material conveying path and the water tank path. During normal production, both the water path and the material conveying path are opened simultaneously to ensure stable delivery of polyurethane prepolymer and water. When cleaning is required, the water path can be opened and the material conveying path closed. The piston pump is then activated to send high-pressure water into the filter box to flush impurities from the filter frame and restore the flowability of the filter holes. At the same time, the water flow enters the working chamber to absorb heat from the equipment and achieve cooling, thereby improving the operational safety of the equipment.

[0020] This invention, by setting up a filter box and an internal metal filter frame, uses filter holes to intercept impurities such as metal debris and solid particles, ensuring the cleanliness of materials entering the working chamber and preventing impurities from aggravating component wear, entanglement of the impeller, or blockage of pipelines. At the same time, the top of the filter box is equipped with a removable cover, which facilitates quick cleaning or replacement of the filter frame. It can also be used with a plunger pump to deliver high-pressure water flow to flush the high end of the filter frame, effectively restoring the flowability of the filter holes and ensuring long-term stable filtration efficiency. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This utility model Figure 1 Another perspective 3D illustration;

[0023] Figure 3 This is a three-dimensional schematic diagram of the connection between the filter box, filter frame, three-way solenoid valve and water tank of this utility model;

[0024] Figure 4 This is a three-dimensional schematic diagram of the filter box and filter frame of this utility model;

[0025] Figure 5 This is a three-dimensional schematic diagram of the internal structure of the homogenizing emulsifier of this utility model;

[0026] Figure 6 This is a three-dimensional schematic diagram of the impeller of this utility model;

[0027] Figure 7 This is a three-dimensional schematic diagram showing the connection between the homogenizing emulsifier, the dispersion vessel, and the reaction vessel in Embodiment 2 of this utility model.

[0028] In the diagram: 1. Base; 2. Drive motor; 201. Motor mounting bracket; 202. Rotating shaft; 3. First protective shell; 301. Connecting part; 4. Second protective shell; 5. Working chamber; 501. Discharge port; 502. Inlet port; 6. Filter box; 601. Metal filter frame; 602. Filter inlet; 603. Filter outlet; 604. Lower end of filter frame; 605. Upper end of filter frame; 606. Bottom support; 607. Box cover; 7. 8. First solenoid valve; 9. Second solenoid valve; 10. Plunger pump; 11. Water tank; 12. Inlet; 13. Outlet; 14. Inlet pipe; 15. Three-way solenoid valve; 16. Support rod; 17. Impeller; 18. Shearing tooth; 19. Stator; 20. Fixing plate; 21. Reactor; 22. Dispersion vessel; 23. Feed pipe; 24. First insulation jacket; 25. Melt pump; 26. Discharge pipe; 27. Second insulation jacket. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1:

[0031] Please see Figures 1 to 6 This utility model provides a technical solution:

[0032] A homogenizing emulsifier for processing polyurethane prepolymers.

[0033] The homogenizing emulsifier includes a drive motor and a working chamber. The drive motor is rigidly connected to the upper surface of the base via a motor mounting bracket at the bottom. The motor mounting bracket and the base are secured with bolts, and flat washers and spring washers are installed at the bolt connections to prevent loosening due to vibration during operation. The drive motor provides power output to the homogenizing emulsifier. The front end of the motor is connected to the connecting part, and a transmission connection is achieved with a rotating shaft through an internal coupling. The rotating shaft extends into the subsequent working chamber.

[0034] The connecting part is covered by a first protective shell, and a second protective shell is added between the first protective shell and the working chamber to effectively isolate external impurities and protect the connecting part, the rotating shaft and subsequent support rods from material splashing or external impact.

[0035] The second protective shell and the motor mounting bracket together elevate the core components of the homogenizing emulsifier, such as the drive motor, connecting parts, and working chamber, so that the main body of the equipment is separated from the base surface by a certain distance. This ensures that the second protective shell and the motor mounting bracket remain parallel in the horizontal direction, avoiding problems such as increased vibration during equipment operation and uneven stress on components caused by inconsistent heights or tilting, and ensuring the stability of power transmission and the overall smooth operation of the equipment.

[0036] The working chamber, as the core area for material handling, contains an impeller fixedly connected to the rotating shaft and a stator (such as...) surrounding the impeller. Figure 5 (As shown). The impeller has multiple raised shearing teeth distributed circumferentially.

[0037] In this embodiment, when the drive motor drives the shaft to rotate at high speed, the impeller rotates synchronously with the shaft, forming a strong shearing effect in conjunction with the stator. Support rods are spaced circumferentially along the front end face of the connecting part. The end of the support rod furthest from the connecting part is fixedly connected to a fixed plate by bolts. The fixed plate is coaxial with the shaft and fixed within the working chamber. The stator is fixed to the front end face of the fixed plate, ensuring that the stator and impeller remain concentric and forming a uniform shearing gap between them. Waterborne polyurethane prepolymer and water enter through the inlet of the working chamber and are drawn into the shearing gap under the centrifugal force of the impeller. High-efficiency homogeneous shearing is achieved through the high-speed relative motion between the shearing teeth and the stator.

[0038] It should be noted that the stator has a circular ring structure with multiple through slots evenly distributed along its inner wall. The shear gap between the stator and the impeller is normally controlled between 0.5-2mm. This gap size can be adjusted according to the material viscosity and homogenization requirements. The drive motor is preferably a three-phase asynchronous frequency conversion motor. The impeller speed of the homogenizing emulsifier can be flexibly adjusted within the range of 1000-3000rpm. By controlling the speed, it can adapt to the processing requirements of waterborne polyurethane prepolymer (PU) of different viscosities. Under high-speed rotation, it provides stable power to the impeller, ensuring that the shearing teeth and stator cooperate to generate sufficient shearing and crushing action, thereby efficiently completing the pre-dispersion treatment of PU and improving the homogenization degree of the material.

[0039] In this embodiment, when the impeller rotates at high speed with the shaft, the tiny gap between the shearing teeth on the edge of the impeller and the inner wall of the stator will exert a strong crushing and shearing effect on the entering polyurethane prepolymer and water. The pre-treated material is thrown towards the inner wall of the stator under the centrifugal force generated by the rotation of the impeller, and flows to the edge of the working chamber through the through groove on the stator. The material at the edge of the working chamber will be drawn back into the central area of ​​the impeller under the negative pressure and hydrodynamic force generated by the rotation of the impeller, and re-enter the shearing gap to be sheared. This cycle repeats, so that the material can be fully homogenized and emulsified under multiple shearing and crushing actions.

[0040] The top of the working chamber is provided with a discharge port (such as...). Figure 1 As shown, the sheared material is conveyed to the subsequent process via a sealed connection with the discharge pipe flange. To prevent the viscosity of the material from increasing due to a sudden drop in temperature during transportation, a second insulation sleeve is installed on the outer wall of the discharge pipe. This effectively reduces heat loss and ensures that the material maintains a suitable physical state when it enters the dispersion tank, facilitating subsequent processing.

[0041] During the preparation and transportation of polyurethane prepolymer in the reactor, impurities that may be introduced include small amounts of metal debris detached from the inner wall of the reactor, unreacted solid raw material particles, rubber or plastic residues from wear of sealing components in the transportation pipeline, and foreign objects such as dust and fibers from the environment. If these impurities enter the working chamber directly without filtration, the hard metal debris or solid particles will exacerbate the wear of the shearing teeth and the inner wall of the stator during the high-speed shearing process between the impeller and the stator, shortening the service life of core components. Fiber impurities may become entangled on the shearing teeth of the impeller, affecting the normal rotation of the impeller, leading to uneven shearing gaps and reducing the homogenization emulsification effect; they may also cause pipeline blockage, resulting in equipment shutdown.

[0042] To remove impurities from the material, the equipment has a filter box installed at the front end of the working chamber feed. Its bottom is fixedly connected to the base via a bottom bracket, which is bolted to the upper surface of the base. Flat washers and spring washers are installed at the bolt connections to ensure stable filtration without shaking. A metal filter frame is installed inside the filter box. The metal filter frame has an inclined design, with the lower end of the left filter frame lower than the upper end of the right filter frame, and the lower end of the filter frame lower than the filter inlet height. The filter inlet is located at the top left side of the filter box (e.g., ...). Figure 4 (As shown).

[0043] In this embodiment, the material is pumped into the filter box by a pump (e.g., a melt pump) through the filter inlet. Since the filter inlet is located at the top left side of the filter box, and the lower end of the filter frame is lower than the height of the filter inlet (e.g., ...), the material is pumped into the filter box by a pump (e.g., a melt pump). Figure 3 As shown, the material is directly poured into the metal filter frame. Under the pressure of the continuous pumping, the material flows towards the upper part of the filter frame on the right. During this flow, the material is subjected to continuous pressure, forcing clean material to pass through the filter holes, while impurities are intercepted by the filter holes and remain inside the filter frame. Because the upper part of the filter frame covers the filter outlet, which is connected to the flange of the feed pipe in the working chamber, the clean material collected under pressure must pass through the filter outlet to enter the working chamber, ensuring that all materials are filtered. When impurities accumulate to a certain level in the filter frame, the operator can open the cover on top of the filter box and lift the filter frame directly upwards for quick cleaning or replacement, maintaining stable filtration efficiency.

[0044] It should be noted that the pore size of the metal filter frame is usually selected as 80-120 mesh (corresponding to a pore size of approximately 125-180μm). This ensures that the polyurethane prepolymer (PU) can smoothly pass through the filter pores under pressure, avoiding excessive material flow resistance or reduced filtration efficiency due to excessively small pore size. It can also effectively intercept common impurities such as metal shavings, solid particles, and rubber residue mixed in during the reaction vessel and transportation process (the particle size of these impurities is mostly greater than 200μm). In addition, there are no filter holes at the joint between the outer walls of the filter frame and the inner wall of the filter box, but instead, smooth contact surfaces are retained. When it is necessary to remove the filter frame, the operator can hold the non-filter hole areas on the inner walls of the filter frame on both sides, using the friction between the outer wall of the filter frame and the inner wall of the filter box to hold it stably, avoiding impurities falling off or the filter frame deforming due to force at the filter holes. This allows the filter frame to be safely and conveniently removed from the filter box for cleaning or replacement.

[0045] The filter box has a removable cover on top (e.g., Figure 3 As shown, the cover is fixed to the top of the filter box with bolts. When the filtration efficiency of the metal filter frame decreases due to the accumulation of impurities after long-term use, the operator can quickly remove the bolts to open the cover and clean, remove impurities, or replace the metal filter frame, greatly improving the convenience of equipment maintenance.

[0046] The inlet pipe of the first solenoid valve of the three-way solenoid valve is connected to the water inlet pipe of the water tank. The water tank is mounted above the water inlet pipe via a "U"-shaped bracket (e.g., Figure 1 As shown), the water tank is elevated to create a natural pressure difference within the tank. An inlet is located on the side of the tank, and an outlet is located at the bottom. The outlet connects to the inlet pipe flange, and a plunger pump (such as...) is installed on the inlet pipe. Figure 2 (As shown).

[0047] In this embodiment, under normal operating conditions (i.e., during the homogenization and shearing treatment of the polyurethane prepolymer), both the first and second solenoid valves are open. The plunger pump starts and pressurizes the water in the tank through reciprocating motion, then pumps it into the filter inlet via the inlet pipe and the three-way solenoid valve. Simultaneously, the polyurethane prepolymer in the reactor enters the filter inlet through another solenoid valve, and then both enter the working chamber. Under the high-speed shearing action of the impeller and stator, the water and prepolymer are fully mixed and homogenized, and finally transported to the subsequent process through the outlet, achieving continuous pre-dispersion processing.

[0048] When cleaning or cooling operations are required, the first solenoid valve opens and the second solenoid valve closes, stopping material transport. The plunger pump starts and pressurizes through reciprocating motion. As the plunger pump draws water backward, the water in the tank flows into the pump chamber along the inlet pipe under the influence of gravity and the natural pressure difference of the water level. Subsequently, the plunger pump pushes forward, pressurizing the water in the pump chamber to form a high-pressure water flow. This flow passes through the inlet pipe, the three-way solenoid valve, and the filter inlet into the filter box. The high-pressure water flow directly impacts the high-end area of ​​the metal filter frame, effectively flushing away the clogging impurities attached to the filter frame and restoring the flowability of the filter pores. After cleaning the filter box, the water continues to enter the working chamber through the filter outlet. As it flows through the impeller, stator, and other core components, it absorbs the heat generated by the equipment's operation, achieving a cooling effect. Finally, the water carrying the heat is discharged separately from the outlet at the top of the working chamber, ensuring stable operation of the equipment at a suitable temperature.

[0049] It should be noted that a three-way solenoid valve can also be installed at the discharge port at the top of the working chamber. This three-way solenoid valve adopts a "one-in, two-out" passage design. Its inlet end is connected to the sealing flange of the discharge port of the working chamber, and the two outlet ends are connected through pipe flanges: one end is connected to the inlet of equipment such as the dispersion kettle, used for conveying the water-based polyurethane prepolymer after homogenization and shearing under normal operating conditions; the other end is connected to the drain pipe, specifically for discharging wastewater carrying impurities and heat during the cleaning or cooling process. When the equipment is in normal production, the three-way solenoid valve at the discharge port switches to the passage connected to the subsequent process to ensure smooth material conveying; while performing cleaning or cooling operations, the three-way solenoid valve simultaneously switches to the passage connected to the drain pipe, so that the wastewater after rinsing the filter frame and the cooling water flowing through the working chamber can be directly discharged through the drain pipe, avoiding wastewater from mixing into subsequent processes and affecting product quality. At the same time, it achieves strict isolation between cleaning wastewater and production materials, improving the flexibility and safety of equipment operation.

[0050] The preferred three-way solenoid valve is a two-position three-way solenoid valve (models such as the 4V230C-08 series can be selected). Its control method employs electromagnetic drive control, with valve path switching achieved via an external PLC control system or independent control buttons. During normal production, the control system sends a signal to open the inlet passage of the second solenoid valve and close the inlet passage of the first solenoid valve, ensuring stable delivery of polyurethane prepolymer from the reactor to the filter box via the feed pipe. When cleaning or cooling is required, the PLC control system switches signals, closing the inlet passage of the second solenoid valve and opening the inlet passage of the first solenoid valve, simultaneously controlling the plunger pump to start, achieving rapid switching of the water path and high-pressure water delivery. It can also be operated manually via buttons, offering high flexibility.

[0051] Example 2:

[0052] Please see Figure 7 This utility model provides a technical solution:

[0053] The homogenizing emulsifier shown in Example 1 is installed between the reaction vessel and the dispersion vessel, forming a continuous production process of "reaction vessel → homogenizing emulsifier → dispersion vessel".

[0054] The inlet pipe of the second solenoid valve of the three-way solenoid valve is sealed to the bottom outlet of the reactor via the feed pipe. A melt pump is connected in series on the feed pipe to stably and quantitatively deliver the polyurethane prepolymer in the reactor to the filter box. To maintain the appropriate viscosity of the material during the conveying process, a first heat insulation sleeve is installed on the outer wall of the feed pipe to reduce heat loss and ensure that the material flows smoothly through the feed pipe and subsequent filtration and shearing processes.

[0055] The top of the working chamber is equipped with a discharge port (such as...) Figure 1As shown, the sheared material is conveyed to the dispersion tank via a sealed connection with the discharge pipe flange. To prevent the viscosity from increasing due to a sudden drop in temperature during conveying, a second insulation sleeve is installed on the outer wall of the discharge pipe. This reduces heat loss and ensures that the material maintains a suitable physical state when entering the dispersion tank, facilitating subsequent processing.

[0056] In this embodiment, the polyurethane prepolymer generated by the reaction of raw materials in the reactor has a viscosity controlled at 10,000-30,000 mPa·s and a temperature maintained at 30-100℃ after the reaction. The PU prepolymer in this state has high viscosity and a certain degree of fluidity, making it suitable for subsequent processing. Subsequently, a melt pump steadily delivers the PU prepolymer from the reactor to the filter box of the homogenizing emulsifier at a precise flow rate of 20-200 kg / min. After impurity filtration, it enters the working chamber for shearing processing.

[0057] The PU prepolymer, after pre-dispersion in a homogenizing emulsifier, is conveyed to the dispersion vessel through a discharge pipe. The dispersion vessel operates at a speed of 100-1000 rpm (in actual production, 500-1000 rpm is usually used to ensure dispersion effect). By setting up a homogenizing emulsifier between the reaction vessel and the dispersion vessel for pre-dispersion, on the one hand, for high-viscosity PU prepolymers, the homogenizing emulsifier can pre-disperse the prepolymer in water at high speed through the high-speed shearing action of the impeller and stator, reducing local viscosity differences and avoiding problems such as uneven dispersion and dead zones caused by excessively high material viscosity when directly entering the dispersion vessel; on the other hand, the pre-dispersioned material has more uniform flowability, which can reduce the stirring load of the dispersion vessel, shorten the dispersion time, and reduce the risk of local overheating of the material caused by prolonged high-intensity stirring, thus ensuring product stability.

[0058] In addition, the number of homogenizing emulsifiers can be flexibly increased according to the actual production requirements for the dispersion precision of PU prepolymer (such as higher homogeneity or finer particle distribution). The pre-dispersion effect can be enhanced by connecting multiple devices in series or in parallel, thereby further optimizing the processing efficiency of the subsequent dispersion tank and the final product quality.

[0059] It should be noted that the reactor is designed with a volume of 3T, which can accommodate 1.5-2T of polyurethane prepolymer raw materials for reaction at a time. This ensures sufficient reaction space and avoids insufficient stirring or abnormal pressure during the reaction process due to overfilling of materials.

[0060] The dispersion vessel has a volume of 6 tons. Before receiving the pre-dispersed material from the homogenizing emulsifier, 1-3 tons of water are typically added as a dispersion medium. The water temperature is controlled between 5-50℃, which can be flexibly adjusted according to the characteristics of the PU prepolymer and subsequent process requirements. This provides a suitable dilution and dispersion environment for the pre-dispersed material, further improving the dispersion effect. This matching design of the vessel volume and material quantity, combined with the pre-dispersion function of the homogenizing emulsifier, ensures that the high-viscosity PU prepolymer can be stably processed at each stage, meeting the efficiency and quality requirements of large-scale production.

[0061] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A homogenizing emulsifier, characterized in that, comprising: a homogenizing emulsifier, which is arranged on a base (1), the homogenizing emulsifier comprises a drive motor (2) and a working chamber (5), the front end of the drive motor (2) is in transmission connection with a rotating shaft (202) through a connecting part (301), the rotating shaft (202) extends into the working chamber (5) and is fixedly connected with an impeller (14), a stator (15) surrounding the impeller (14) is arranged in the working chamber (5), a polyurethane prepolymer enters through the feed port (502) of the working chamber (5), is sucked into the shear gap under the centrifugal force of the impeller (14), and is used for shearing the aqueous polyurethane prepolymer; a filter box (6), in which a metal filter frame (601) is installed, after the polyurethane prepolymer enters from the filter inlet (602) of the filter box (6), it is filtered by the metal filter frame (601) to remove impurities, the filtered material flows out from the filter outlet (603) of the filter box (6), the filter outlet (603) is flange-connected with the feed port (502) of the working chamber (5), and the filter inlet (602) of the filter box (6) is connected with the outlet pipeline of a three-way solenoid valve (12); The inlet pipeline of the first solenoid valve (7) of the three-way solenoid valve (12) is connected with the water inlet pipe (11) of a water tank (10).

2. The homogenizing emulsifier according to claim 1, characterized in that: The height of the low end (604) of the left filter frame of the metal filter frame (601) is lower than the height of the high end (605) of the right filter frame, the height of the low end (604) of the filter frame is lower than the height of the filter inlet (602), and the high end (605) of the filter frame covers the filter outlet (603).

3. A homogenizing emulsifier according to claim 2, characterized in that: The top of the filter box (6) is detachably provided with a box cover (607), the box cover (607) is fixedly connected with the top of the filter box (6) through bolts, and the bottom of the filter box (6) is fixedly connected with the base (1) through a bottom support (606).

4. The homogenizing emulsifier according to claim 1, characterized in that: The water tank (10) is erected above the water inlet pipe (11) through a "C"-shaped support, a water inlet (1001) is arranged on the side surface of the water tank (10), a water outlet (1002) is arranged at the bottom, the water outlet (1002) is connected to the water inlet pipe (11), and a plunger pump (9) is connected to the water inlet pipe (11).

5. A homogenizing emulsifier according to claim 1, characterized in that: A plurality of raised shear teeth (1401) are circumferentially distributed on the impeller (14), support rods (13) are arranged at intervals along the circumferential direction on the front end face of the connecting part (301), the end of each support rod (13) far from the connecting part (301) is fixedly connected to a fixing plate (16), the fixing plate (16) is arranged in the working chamber (5) and coaxial with the rotating shaft (202), the stator (15) is fixed on the front end face of the fixing plate (16) to keep the stator (15) concentric with the impeller (14), and a shear gap is formed between the stator (15) and the impeller (14).

6. A homogenizing emulsifier according to claim 1, characterized in that: The motor is fixedly connected to the upper end face of the base (1) through a bottom motor fixing frame (201), the outside of the connecting part (301) is covered with a first protective shell (3), and a second protective shell (4) is arranged between the first protective shell (3) and the working chamber (5).

7. A homogenizing emulsifier according to claim 1, characterized in that: The top of the working chamber (5) is provided with a discharge port (501), which is sealed to the inlet pipe of the dispersion vessel (18) through a discharge pipe (22). A second heat insulation sleeve (23) is provided on the outer peripheral wall of the discharge pipe (22).

8. A homogenizing emulsifier according to claim 1, characterized in that: The inlet pipe of the second solenoid valve (8) of the three-way solenoid valve (12) is sealed to the outlet at the bottom of the reactor (17) through the feed pipe (19). A melt pump (21) is connected in series on the feed pipe (19) to stably transport the polyurethane prepolymer in the reactor (17) to the filter box (6). The outer peripheral wall of the feed pipe (19) is fitted with a first heat insulation sleeve (20).

Images