Solvent-free polyurethane adhesive production convenient access type glue tank

Abstract

The utility model discloses a convenient access type glue storage tank for solventless polyurethane adhesive production, including glue storage tank, the lower extreme of glue storage tank is connected with the conical delivery cover, the lower extreme of conical delivery cover is connected with the delivery structure, the upper end of glue storage tank is installed with the scraping glue mechanism, the lower extreme one side of conical delivery cover is connected with nitrogen gas delivery mechanism, the lower extreme other side of conical delivery cover is connected with the circulating mechanism, the delivery structure includes the drain pipe of connecting in the middle part of the lower extreme of conical delivery cover, install the heater on the drain pipe, nitrogen gas delivery mechanism includes the nitrogen gas delivery pipe of connecting in the lower extreme one side of conical delivery cover, one side of glue storage tank is equipped with the nitrogen gas storage jar. The utility model reduces the colloid adhesion, is easy to clean and peeling, can promote the efficiency of taking out simultaneously, can also adapt to the filler system of different sedimentation speed, improves the storage quality, in addition can greatly reduce raw material consumption, reduces the cost, has strengthened the practicality.

Description

Technical Field

[0001] This utility model relates to the technical field of solvent-free polyurethane adhesive storage tanks, and in particular to an easy-to-access storage tank for the production of solvent-free polyurethane adhesives. Background Technology

[0002] With increasingly stringent environmental regulations and the growing popularity of green manufacturing concepts, solvent-free polyurethane adhesives are rapidly gaining popularity in fields such as flexible packaging lamination, automotive interiors, and building sealing due to their advantages such as high solids content (close to 100%) and absence of volatile organic solvents.

[0003] However, due to their high solids content and lack of diluents, solvent-free polyurethane adhesives are prone to filler sedimentation and component separation when left to stand for a long time. The residual colloid can reach 5%-8% at the end of the dispensing process, resulting in severe adhesion to the tank wall and slow dispensing. To address these issues, we have proposed an easy-to-access storage tank for the production of solvent-free polyurethane adhesives. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an easy-to-access storage tank for the production of solvent-free polyurethane adhesives.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A solvent-free polyurethane adhesive production container with easy access includes a container, a conical conveying hood connected to the lower end of the container, a conveying structure connected to the lower end of the conical conveying hood, a scraping mechanism installed at the upper end of the container, a nitrogen conveying mechanism connected to one side of the lower end of the conical conveying hood, and a circulation mechanism connected to the other side of the lower end of the conical conveying hood. The conveying structure includes a discharge pipe connected to the middle of the lower end of the conical conveying hood, and a heater is installed on the discharge pipe; The nitrogen delivery mechanism includes a nitrogen delivery pipe connected to one side of the lower end of the conical delivery hood, a nitrogen storage tank is provided on one side of the glue storage tank, a nitrogen delivery pump is connected to the lower end of the nitrogen storage tank, and one end of the nitrogen delivery pipe is connected to one side of the nitrogen delivery pump. A sensor array is installed on one side of the glue storage tank.

[0006] Preferably, the scraping mechanism includes a speed reducer installed on the upper end of the glue storage tank, a stepper motor installed on the upper end of the speed reducer, the output shaft of the speed reducer passing through the glue storage tank and extending into the glue storage tank, a rotating plate connected to the end of the output shaft of the speed reducer, a scraper installed on one side of the lower end of the rotating plate, and one end of the scraper abutting against one side inside the glue storage tank.

[0007] Preferably, the circulation mechanism includes a circulation pump connected to one side of the conical conveying hood, one end of the circulation pump being connected to a circulation pipe, and one end of the circulation pipe being connected to the upper side of the glue storage tank.

[0008] Preferably, the conical conveying hood has a nano-ceramic coating on its inner sidewall.

[0009] Preferably, an electric valve is installed on the discharge pipe.

[0010] Preferably, a feeding pipe is connected to one side of the upper end of the glue storage tank, and an exhaust pipe is connected to the other side of the upper end of the glue storage tank.

[0011] This utility model has the following advantages: 1. Through the setting of the adhesive scraping mechanism and nano-ceramic coating, the surface energy is significantly reduced, and the adhesive adhesion is reduced by more than 60%, making it easy to clean and peel off; 2. Conical conveyor hood + bottom centralized discharge improves flow field distribution, eliminates dead zones, and enhances self-discharge capability; 3. Nitrogen pulse + circulation dual-mode homogenization, balancing energy saving and efficiency, adapting to packing systems with different settling velocities, and improving storage quality; 4. Fully enclosed operation + nitrogen protection + residual glue recycling achieve low energy consumption and low loss, greatly reducing costs; In summary, this invention reduces colloid adhesion by more than 60%, facilitates cleaning and peeling, improves extraction efficiency, is compatible with filler systems with different settling velocities, enhances storage quality, significantly reduces raw material loss, lowers costs, and enhances practicality. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a structural diagram of the adhesive scraping mechanism of this utility model; Figure 3 A structural diagram of the nano-ceramic coating of this utility model is provided.

[0013] In the diagram: 101 Nitrogen storage tank, 102 Nitrogen delivery pipe, 103 Nitrogen delivery pump, 201 Glue storage tank, 202 Conical conveying hood, 203 Discharge pipe, 204 Heater, 205 Electric valve, 301 Circulation pump, 302 Circulation pipe, 401 Stepper motor, 402 Reducer, 403 Rotating plate, 404 Scraper, 501 Exhaust pipe, 502 Feeding pipe, 503 Sensor group, 504 Nano ceramic coating. Detailed Implementation

[0014] 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.

[0015] Reference Figure 1-3 A solvent-free polyurethane adhesive production easy-to-access storage tank includes a storage tank 201, a conical conveying hood 202 connected to the lower end of the storage tank 201, a conveying structure connected to the lower end of the conical conveying hood 202, a scraping mechanism installed at the upper end of the storage tank 201, a nitrogen conveying mechanism connected to one side of the lower end of the conical conveying hood 202, and a circulation mechanism connected to the other side of the lower end of the conical conveying hood 202. The bottom of the tank adopts a 60° inclined conical structure to eliminate right-angle dead corners, and with the help of the scraper guide, the adhesive is directed to the outlet. The conveying structure includes a discharge pipe 203 connected to the middle of the lower end of the conical conveying hood 202. A heater 204 is installed on the discharge pipe 203. The heater 204 (temperature controlled at 40±2℃) maintains the fluidity of the colloid. The nitrogen delivery mechanism includes a nitrogen delivery pipe 102 connected to one side of the lower end of the conical delivery hood 202, a nitrogen storage tank 101 on one side of the glue storage tank 201, a nitrogen delivery pump 103 connected to the lower end of the nitrogen storage tank 101, one end of the nitrogen delivery pipe 102 connected to one side of the nitrogen delivery pump 103, and 0.2MPa inert nitrogen gas is introduced into the bottom of the tank to resuspend the settled packing. Pulse mode: start for 10 minutes every 2 hours to prevent continuous gas supply from causing the colloid to solidify. A sensor group 503 is installed on one side of the storage tank 201. The sensor group 503 measures the temperature field at different heights of the tank and monitors the migration and phase separation tendency of polar components. The scraping mechanism includes a reducer 402 installed on the upper end of the glue storage tank 201. A stepper motor 401 is installed on the upper end of the reducer 402. The stepper motor 401 is equipped with a closed-loop position feedback system, which can accurately record the number of scraper rotations and the dwell angle to determine whether there is jamming or abnormal clumping. The output shaft of the reducer 402 passes through the rubber storage tank 201 and extends into the rubber storage tank 201. The end of the output shaft of the reducer 402 is connected to a rotating plate 403. A scraper 404 is installed on one side of the lower end of the rotating plate 403. One end of the scraper 404 abuts against one side inside the rubber storage tank 201. The scraper 404 adopts a gradient hardness silicone rubber-coated metal skeleton structure, which can fit tightly against the tank wall and avoid scratching the coating. The circulation mechanism includes a circulation pump 301 connected to one side of the conical conveying hood 202, one end of the circulation pump 301 is connected to a circulation pipe 302, and one end of the circulation pipe 302 is connected to the upper side of the glue storage tank 201. The conical conveyor hood 202 has a nano-ceramic coating 504 on its inner side wall. The nano-ceramic coating 504 has excellent wear resistance and chemical inertness, reduces flow resistance, and the residual colloids gather to the bottom discharge port under the action of gravity. An electric valve 205 is installed on the discharge pipe 203. A feeding pipe 502 is connected to one side of the upper end of the glue storage tank 201, and an exhaust pipe 501 is connected to the other side of the upper end of the glue storage tank 201. The feeding pipe 502 is equipped with a mass flow meter and an electric regulating valve to realize automatic control of the feeding rate according to a preset curve (e.g., fast first and then slow), so as to avoid turbulent air entrainment caused by impact filling. The exhaust pipe 501 is connected to a condensation recovery device and an activated carbon adsorption module to capture volatile oligomers and trace amounts of moisture, preventing environmental pollution and backflow pollution. In this utility model: Phase 1: Filling Phase – Preventing Initial Adhesion When fresh colloid is injected into the storage tank 201 through the feed pipe 502, the following actions are initiated simultaneously: The adhesive scraping mechanism operates automatically: Stepper motor 401 drives reducer 402, which in turn drives rotating plate 403 and scraper 404 to rotate continuously at low speed (3–5 rpm); the edge of the scraper is in close contact with the inner wall of the tank, forming a dynamic scraping effect, which effectively prevents the newly injected high-viscosity adhesive from adhering to the metal surface before cooling and solidification; at the same time, exhaust pipe 501 is opened to release the internal air pressure generated by rapid filling and avoid foam entrainment; sensor group 503 monitors the liquid level, temperature and viscosity trends in real time and feeds them back to the central controller; Phase Two: Static Settling Prevention Phase – Combining Main and Auxiliary Agents to Maintain Uniform Composition During periods of non-use or prolonged standby, the system enters an active anti-settling mode to prevent the packing material from settling and separating from the phase. (1) Main method: nitrogen pulse stirring (micro-disturbance homogenization) High-pressure nitrogen is intermittently injected into the nitrogen delivery pipe 102 through the nitrogen delivery pump 103 in the nitrogen storage tank 101; the gas enters the bottom area through the side opening of the conical delivery hood 202, forming a cluster of tiny bubbles at the bottom of the colloid; the bubbles slowly rise and trigger local convection, breaking the sedimentation trend and achieving "shear-free mixing"; the control system is set to a timed pulse mode (such as ventilating for 30 seconds every 2 hours) to avoid excessive oxidation or foaming.

[0016] (2) Auxiliary means: cyclical redistribution Start the circulation pump 301 to extract the concentrated colloid from the bottom and send it back to the top of the storage tank through the circulation pipe 302; this creates vertical convection, breaks the density gradient, and is especially suitable for high-density packing systems; it also operates in staggered shifts with nitrogen pulses to enhance the overall homogenization effect.

[0017] Phase Three: Material Removal Phase—Achieving Efficient Glue Discharge When the colloid needs to be removed for coating or dispensing, the system switches to active discharge mode, with multiple systems operating in conjunction: (1) Preheating to reduce viscosity: Turn on the heater 204 installed on the discharge pipe 203 to moderately heat the colloid in the outlet section (e.g., to 40–60°C); the temperature is precisely monitored by the sensor group to avoid premature cross-linking due to overheating; the viscosity of the colloid can be reduced by more than 50%, significantly improving its flowability; (2) Open the emission channel: Open the electric valve 205 to establish an outflow path; the geometric design of the conical conveyor hood 202 allows the colloid to naturally converge towards the center; (3) Mechanical pushing and discharging: The scraping mechanism operates at a higher speed (8–12 rpm), and the scraper 404 pushes the adhesive near the tank wall towards the bottom conical opening; the rotating plate drives the adhesive in the central area to generate a slight centrifugal force, further promoting the flow to the discharge port; compared with the traditional gravity discharge method, the adhesive discharge rate is increased by 2–3 times, and the flow rate is stable without pulsation; At the end of the discharge phase, the electric valve 205 is closed and switched to reverse circulation mode; the circulation pump 301 reverses to draw the thick residual glue that remains in the discharge pipe and at the bottom of the conical hood back to the upper part of the glue storage tank; during the reflux process, a small amount of new glue or regulator is mixed in to dilute and activate the aged glue; it participates in the homogenization process together during the next feeding to achieve resource reuse.

[0018] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An easily accessible storage tank for the production of solvent-free polyurethane adhesives, comprising a storage tank (201), characterized in that, The lower end of the glue storage tank (201) is connected to a conical conveying hood (202), the lower end of the conical conveying hood (202) is connected to a conveying structure, the upper end of the glue storage tank (201) is equipped with a glue scraping mechanism, one side of the lower end of the conical conveying hood (202) is connected to a nitrogen conveying mechanism, and the other side of the lower end of the conical conveying hood (202) is connected to a circulation mechanism. The conveying structure includes a discharge pipe (203) connected to the middle of the lower end of the conical conveying hood (202), and a heater (204) is installed on the discharge pipe (203). The nitrogen delivery mechanism includes a nitrogen delivery pipe (102) connected to one side of the lower end of the conical delivery hood (202), a nitrogen storage tank (101) is provided on one side of the glue storage tank (201), a nitrogen delivery pump (103) is connected to one side of the lower end of the nitrogen storage tank (101), and one end of the nitrogen delivery pipe (102) is connected to one side of the nitrogen delivery pump (103). A sensor group (503) is provided on one side inside the glue storage tank (201).

2. The easy-to-access storage tank for producing solvent-free polyurethane adhesives according to claim 1, characterized in that: The scraping mechanism includes a speed reducer (402) installed on the upper end of the glue storage tank (201). A stepper motor (401) is installed on the upper end of the speed reducer (402). The output shaft of the speed reducer (402) passes through the glue storage tank (201) and extends into the glue storage tank (201). A rotating plate (403) is connected to the end of the output shaft of the speed reducer (402). A scraper (404) is installed on one side of the lower end of the rotating plate (403). One end of the scraper (404) abuts against one side inside the glue storage tank (201).

3. The easy-to-access storage tank for producing solvent-free polyurethane adhesives according to claim 1, characterized in that: The circulation mechanism includes a circulation pump (301) connected to one side of the conical conveying hood (202), one end of the circulation pump (301) is connected to a circulation pipe (302), and one end of the circulation pipe (302) is connected to the upper side of the glue storage tank (201).

4. The easy-to-access storage tank for producing solvent-free polyurethane adhesives according to claim 1, characterized in that: The conical conveying hood (202) has a nano-ceramic coating (504) on its inner sidewall.

5. The easy-to-access storage tank for producing solvent-free polyurethane adhesives according to claim 1, characterized in that: An electric valve (205) is installed on the discharge pipe (203).

6. The easy-to-access storage tank for producing solvent-free polyurethane adhesives according to claim 1, characterized in that: The upper end of the glue storage tank (201) is connected to a feeding pipe (502) on one side, and an exhaust pipe (501) is connected to the other side of the upper end of the glue storage tank (201).

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