A flame-retardant polyurethane structural adhesive synthesis system
By designing automated feeding, mixing, and cleaning components, the problems of uneven raw material ratios and incomplete cleaning in the flame-retardant polyurethane structural adhesive synthesis system have been solved, thereby achieving product performance stability and improved production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU XIAOMO NEW MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2025-08-13
- Publication Date
- 2026-07-24
AI Technical Summary
Existing flame-retardant polyurethane structural adhesive synthesis systems have shortcomings in automation, precise control, and cleaning and maintenance, resulting in unstable product quality, low production efficiency, and batch-to-batch quality inconsistencies.
An automated system comprising a feeding assembly, a reaction vessel assembly, a stirring assembly, and a cleaning assembly is employed. Precise metering is achieved using a loss-in-weight feeder and a mass flow meter, while uniform mixing is performed by a three-dimensional spiral stirring blade. Multi-angle nozzles are combined for cleaning, enabling automated mixing and spraying of the cleaning solution.
It enables precise control of raw material ratios, improves product performance stability and batch repeatability, shortens production cycles, increases cleaning coverage and equipment lifespan, and reduces scrap rate and manual intervention time.
Smart Images
Figure CN224541534U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polyurethane structural adhesive technology, and in particular to a flame-retardant polyurethane structural adhesive synthesis system. Background Technology
[0002] Flame-retardant polyurethane structural adhesive is a material specifically designed to provide high-strength bonding performance while possessing excellent flame-retardant properties. It is widely used in construction, transportation (such as automobiles, aircraft, electronics, and industrial manufacturing), especially in applications with strict fire safety requirements.
[0003] In current production practices of flame-retardant polyurethane structural adhesives, many companies use traditional synthesis systems that, while capable of performing basic chemical reactions and production functions, have significant shortcomings in automation, precise control, and cleaning and maintenance. Specifically, these systems typically rely on manual or semi-automatic methods for raw material feeding, lacking high-precision mass flow meters or loss-in-weight feeders, which makes it difficult to maintain consistent ratios of key components, leading to fluctuations in product quality, such as uneven bond strength and unstable curing time. Cleaning is also mostly done manually. These problems combined ultimately result in a series of negative consequences, including low production efficiency and inconsistent quality between batches. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a flame-retardant polyurethane structural adhesive synthesis system.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A flame-retardant polyurethane structural adhesive synthesis system includes: a feeding assembly for metering raw materials; a reaction vessel assembly including a reaction vessel body, wherein a feeding pipe is connected to the top of the reaction vessel body and is connected to the feeding assembly, and a discharge pipe is connected to the bottom of the side wall of the reaction vessel body; a stirring assembly disposed inside the reaction vessel body for mixing different raw materials; and a cleaning assembly for cleaning residual structural adhesive inside the reaction vessel body.
[0007] As a preferred technical solution of this utility model, the feeding assembly includes several storage bins and several loss-in-weight feeders. The storage bins are used to hold liquid raw materials, and the loss-in-weight feeders are used to hold solid raw materials. The bottom ends of the storage bins and the loss-in-weight feeders are connected to a connecting pipe. A mass flow meter is installed on the connecting pipe connected to the storage bins, and a valve is installed on the connecting pipe. All the connecting pipes are connected to the feeding pipe.
[0008] As a preferred technical solution of this utility model, the stirring assembly includes a motor installed at the bottom of the reactor body. The output end of the motor is connected to a rotating shaft, which extends into the interior of the reactor body and is rotatably connected to the reactor body. Several stirring blades are fixed on the side wall of the rotating shaft, and all the stirring blades are arranged in a three-dimensional spiral along the rotating shaft.
[0009] As a preferred embodiment of this utility model, the cleaning assembly includes a disc disposed on the top surface of the reactor body. The disc is hollow inside. Several nozzles are connected to the bottom of the disc, and a liquid inlet pipe is connected to the top of the disc. The top end of the liquid inlet pipe extends to the top of the reactor body. The cleaning assembly also includes a collection box, a high-pressure liquid pump, and several storage boxes. A flow pipe is connected to the bottom of each storage box. A mass flow meter and a valve are installed on the flow pipe. All the flow pipes are connected to the collection box. The inlet end of the high-pressure liquid pump is connected to the collection box, and the outlet end of the high-pressure liquid pump is connected to the inlet pipe through a rotary joint.
[0010] As a preferred technical solution of this utility model, the cleaning assembly further includes a control component, which includes a sleeve fixedly connected to the top of the disc, the liquid inlet pipe being located inside the sleeve, the sleeve extending above the reactor body and being rotatably connected to the reactor body, a second motor being installed on the reactor body, and gears being fixedly sleeved on both the output shaft of the second motor and the sleeve, with the two gears meshing with each other.
[0011] As a preferred embodiment of this invention, all of the nozzles have different tilt angles.
[0012] This utility model has the following beneficial effects:
[0013] 1. Achieved precise metering and automated control of raw materials: This solution uses a storage bin and a mass flow meter to accurately meter liquid raw materials, while a loss-in-weight feeder is used to dynamically weigh and control solid raw materials. All metering equipment is linked to the central control system. This dual metering mechanism effectively avoids the errors caused by traditional manual weighing or volume measurement, ensuring a high degree of consistency in the proportions of key components such as polyols, isocyanates, and flame retardants. This fundamentally guarantees the stability of product performance and batch-to-batch repeatability, and reduces the scrap rate caused by formula deviations.
[0014] 2. The internal stirring design of the reactor has been optimized: The stirring assembly adopts a motor-driven rotating shaft that drives a three-dimensional spiral arrangement of stirring blades, with each stirring blade staggered in the vertical direction. This structure not only enhances the shearing and convection of the reactants, enabling the rapid and uniform mixing of raw materials with different densities and viscosities, but also effectively prevents the problem of excessively high local concentrations or heat accumulation. At the same time, the thin and staggered design of the stirring blades creates favorable conditions for subsequent cleaning, reduces dead zones, and improves the mass and heat transfer efficiency of the entire system, thereby accelerating the reaction rate, shortening the production cycle, and ensuring the uniformity of polyurethane structural adhesive molecular chain growth.
[0015] 3. Achieves efficient and thorough in-situ cleaning: The cleaning assembly uses multiple nozzles with different tilt angles to cover various areas such as the inner wall of the reactor, the bottom inclined surface, the rotating shaft, and the stirring blades. With the help of the motor-driven disc rotation, the nozzles rotate 360 degrees while spraying, which greatly expands the spray range and impact angle of the cleaning fluid and effectively removes residual colloids. This design avoids the problem of incomplete cleaning caused by traditional fixed nozzles, significantly improves the cleaning coverage and cleanliness, reduces manual intervention and downtime, and ensures the purity and quality stability of the next batch of products.
[0016] 4. Automatic mixing of cleaning solutions: The system is equipped with multiple storage tanks to store water and different types of cleaning solutions respectively. The amount of each cleaning agent added is precisely controlled by mass flow meter II and valve II. The solution is then collected into the collection tank as needed for mixing. The high-pressure liquid pump delivers the prepared cleaning solution to the nozzle through a rotary joint. The entire process can achieve precise preparation and sequential use of cleaning agents without manual operation. This not only avoids the arbitrariness and safety hazards of manual mixing, but also allows for the selection of the optimal cleaning solution based on the characteristics of different residues, enhancing the targeting and effectiveness of cleaning and extending the service life of the equipment. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a flame-retardant polyurethane structural adhesive synthesis system proposed in this utility model;
[0018] Figure 2 This is a schematic diagram of the storage box structure;
[0019] Figure 3 for Figure 1 Enlarged view of the structure at point A;
[0020] Figure 4 This is a schematic diagram of the stirring blade structure;
[0021] Figure 5 This is a schematic diagram of the structure of the disc and the nozzle.
[0022] In the diagram: 11 Storage bin, 12 Mass flow meter I, 13 Loss-in-weight feeder, 14 Connecting pipe, 15 Valve I, 21 Reactor body, 22 Feed pipe, 23 Discharge pipe, 31 Motor I, 32 Rotary shaft, 33 Stirring blade, 41 Nozzle, 42 Disc, 43 Liquid inlet pipe, 44 Rotary joint, 45 Storage bin, 46 Mass flow meter II, 47 Valve II, 48 Flow pipe, 49 Aggregator, 410 High-pressure liquid pump, 51 Sleeve, 52 Gear, 53 Motor II. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0024] Reference Figure 1-5 A flame-retardant polyurethane structural adhesive synthesis system includes a feeding assembly, a reaction vessel assembly, a stirring assembly, and a cleaning assembly.
[0025] Please refer to the appendix for details. Figure 1 The feeding assembly is used to measure the raw materials. It includes several storage bins 11 and several loss-in-weight feeders 13. The storage bins 11 are used to hold liquid raw materials, and the loss-in-weight feeders 13 are used to hold solid raw materials. Each loss-in-weight feeder 13 mainly consists of a feeding hopper and a weighing sensor. The weighing sensor is a force sensor that can monitor the weight of the feeding hopper and the raw materials inside. The structure and working principle of this device are existing technologies and will not be elaborated upon here. The bottom ends of both the storage bins 11 and the loss-in-weight feeders 13 are connected to a connecting pipe 14. The connecting pipe 14, which connects to the storage bins 11, is equipped with... There is a mass flow meter 12, and a valve 15 is installed on the connecting pipe 14. All the connecting pipes 14 are connected to the feed pipe 22. The valve 15 is an automatic control valve, including a solenoid valve, a pneumatic valve, etc. The valve 15, the mass flow meter 12, and the loss-in-weight feeder 13 are all connected and controlled by a PLC (programmable logic controller) or a DCS (distributed control system). Their specific working principles are all existing technologies, so they will not be described in detail. When the threshold set in the mass flow meter 12 and the loss-in-weight feeder 13 is reached, the control system will control the valve 15 to close.
[0026] Please refer to the appendix for details. Figure 1 The reactor assembly includes a reactor body 21, with a feed pipe 22 connected to the top of the reactor body 21 and connected to the feed assembly. A discharge pipe 23 is connected to the bottom of the side wall of the reactor body 21. The inner bottom surface of the reactor body 21 is inclined, and the discharge pipe 23 is located at the lowest point of the inclined surface to facilitate discharge.
[0027] Please refer to the appendix for details. Figure 1 and Figure 4 The stirring assembly is located inside the reactor body 21 and is used to mix different raw materials. The stirring assembly includes a motor 31 installed at the bottom of the reactor body 21. The output end of the motor 31 is connected to a rotating shaft 32, which extends into the interior of the reactor body 21 and is rotatably connected to the reactor body 21. Several stirring blades 33 are fixed on the side wall of the rotating shaft 32. The stirring blades 33 are thin and all the stirring blades 33 are arranged in a three-dimensional spiral along the rotating shaft 32. In the vertical direction, all the stirring blades 33 are staggered, so that they can fully contact the cleaning liquid during the cleaning stage.
[0028] Please refer to the appendix for details. Figure 2 and Figure 5 The cleaning assembly is used to clean the residual structural adhesive inside the reactor body 21. The cleaning assembly includes a disc 42 set on the top surface inside the reactor body 21. The disc 42 is hollow inside. Several nozzles 41 are connected to the bottom of the disc 42. All the nozzles 41 have different tilt angles. Specifically, the nozzles 41 are divided into three groups, which are tilted towards the inner wall of the reactor body 21, vertically downward, and tilted towards the direction of the rotating shaft 32, respectively. The tilt angle of the nozzles 41 in each group is also different. This design can improve the spraying range of the nozzles 41. The top of the disc 42 is connected to a liquid inlet pipe 43. The top end of the liquid inlet pipe 43 extends to the top of the reactor body 21.
[0029] The cleaning assembly also includes a collection tank 49, a high-pressure liquid pump 410, and several storage tanks 45. The storage tanks 45 are used to store water and different cleaning solutions, including alkali, acid, and solvent. The bottom of the storage tank 45 is connected to a flow pipe 48, which is equipped with a second mass flow meter 46 and a second valve 47. The working principle of the second mass flow meter 46 and the second valve 47 is the same as that of the first mass flow meter 12 and the first valve 15, respectively. All the flow pipes 48 are connected to the collection tank 49. The inlet end of the high-pressure liquid pump 410 is connected to the collection tank 49, and the outlet end of the high-pressure liquid pump 410 is connected to the inlet pipe 43 through a rotary joint 44. Under this design, different cleaning solutions can be collected into the collection tank 49 according to a set ratio, improving the cleaning quality and significantly improving the work efficiency compared to manual mixing.
[0030] Further details are provided in the appendix. Figure 1 and Figure 3The cleaning assembly also includes a control component, which includes a sleeve 51 fixedly connected to the top of the disc 42. The liquid inlet pipe 43 is located inside the sleeve 51. The sleeve 51 extends above the reactor body 21 and is rotatably connected to the reactor body 21. A second motor 53 is installed on the reactor body 21. Gears 52 are fixedly fitted on both the output shaft of the second motor 53 and the sleeve 51. The two gears 52 mesh with each other. Driven by the second motor 53, the disc 42 and the nozzle 41 can rotate. This design further increases the spray range of the cleaning liquid.
[0031] The specific working principle of this utility model is as follows:
[0032] Polyols, plasticizers, flame retardants and other raw materials are placed in storage bins 11 and loss-in-weight feeders 13 according to their respective forms. The raw materials are metered and proportioned by mass flow meter 12 and loss-in-weight feeder 13. The raw materials can enter the interior of reactor body 21 through connecting pipe 14 and feed pipe 22. Motor 31 is started, and motor 31 drives rotating shaft 32 and stirring blade 33 to rotate and stir the raw materials. After the structural adhesive is synthesized, it is discharged through discharge pipe 23.
[0033] After discharge, motor 53 and high-pressure liquid pump 410 are started. High-pressure liquid pump 410 can pass the cleaning liquid in the collection tank 49 into the inlet pipe 43. Different cleaning liquids are stored separately in storage tank 45. The quantitative feeding of the cleaning liquid is controlled by mass flow meter 46 and valve 47 to achieve precise mixing ratio of the cleaning liquid. The prepared cleaning liquid enters the disc 42 through the inlet pipe 43 and is then sprayed out through nozzle 41. During this process, under the transmission of gear 52, motor 53 can drive sleeve 51 and disc 42 to rotate, so that nozzle 41 rotates together. The high-pressure liquid sprayed from nozzle 41 can rush towards the inner wall of reactor body 21, rotating shaft 32 and stirring blade 33 to remove residual glue. After the cleaning liquid is rinsed, valve 47 on storage tank 45 is opened to allow water to enter the collection tank 49, inlet pipe 43 and disc 42 in sequence, and finally spray out through nozzle 41 to clean the cleaning liquid.
[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A flame-retardant polyurethane structural adhesive synthesis system, characterized in that, include: Feeding assembly, used to meter raw materials; The reactor assembly includes a reactor body (21), with a feed pipe (22) connected to the top of the reactor body (21), the feed pipe (22) being connected to a feed assembly, and a discharge pipe (23) connected to the bottom of the side wall of the reactor body (21). The stirring assembly is located inside the reactor body (21) and is used to mix different raw materials; Cleaning assembly for cleaning residual structural adhesive inside the reactor body (21).
2. The flame-retardant polyurethane structural adhesive synthesis system according to claim 1, characterized in that, The feeding assembly includes several storage bins (11) and several loss-in-weight feeders (13). The storage bins (11) are used to hold liquid raw materials, and the loss-in-weight feeders (13) are used to hold solid raw materials. The bottom ends of the storage bins (11) and the loss-in-weight feeders (13) are connected to a connecting pipe (14). A mass flow meter (12) is provided on the connecting pipe (14) connected to the storage bins (11), and a valve (15) is provided on the connecting pipe (14). All of the connecting pipes (14) are connected to the feed pipe (22).
3. The flame-retardant polyurethane structural adhesive synthesis system according to claim 1, characterized in that, The stirring assembly includes a motor (31) installed at the bottom of the reactor body (21). The output end of the motor (31) is connected to a rotating shaft (32). The rotating shaft (32) extends into the interior of the reactor body (21) and is rotatably connected to the reactor body (21). Several stirring blades (33) are fixed on the side wall of the rotating shaft (32). All the stirring blades (33) are arranged in a three-dimensional spiral along the rotating shaft (32).
4. The flame-retardant polyurethane structural adhesive synthesis system according to claim 1, characterized in that, The cleaning assembly includes a disc (42) disposed on the top surface inside the reactor body (21). The disc (42) is hollow inside. A plurality of nozzles (41) are connected to the bottom of the disc (42). A liquid inlet pipe (43) is connected to the top of the disc (42). The top end of the liquid inlet pipe (43) extends to the top of the reactor body (21). The cleaning assembly also includes a collection box (49), a high-pressure liquid pump (410), and several storage boxes (45). The bottom of the storage box (45) is connected to a flow pipe (48). The flow pipe (48) is equipped with a mass flow meter (46) and a valve (47). All the flow pipes (48) are connected to the collection box (49). The inlet end of the high-pressure liquid pump (410) is connected to the collection box (49). The outlet end of the high-pressure liquid pump (410) is connected to the inlet pipe (43) through a rotary joint (44).
5. The flame-retardant polyurethane structural adhesive synthesis system according to claim 4, characterized in that, The cleaning assembly also includes a control component, which includes a sleeve (51) fixedly connected to the top of the disc (42). The liquid inlet pipe (43) is located inside the sleeve (51). The sleeve (51) extends above the reactor body (21) and is rotatably connected to the reactor body (21). A second motor (53) is installed on the reactor body (21). Gears (52) are fixedly sleeved on both the output shaft of the second motor (53) and the sleeve (51). The two gears (52) mesh with each other.
6. The flame-retardant polyurethane structural adhesive synthesis system according to claim 5, characterized in that, All of the nozzles (41) have different tilt angles.