Low voc acrylic coating processing equipment

Abstract

The utility model relates to acrylic paint processing technical field discloses low VOC acrylic paint processing equipment, including the reation kettle, the reation kettle upper end middle part fixedly connected with motor, motor drive end fixedly connected with the rotating shaft, the rotating shaft middle part outer wall fixedly connected with the inner screw belt paddle, the rotating shaft outer wall fixedly connected with the fixed link, the fixed link outside fixedly connected with the outer screw belt paddle, the outer screw belt paddle surface is provided with the ultrasonic vibrator, the reation kettle upper end left side is provided with the gas inlet, the reation kettle upper end right side fixedly connected with small -size booster pump, small -size booster pump right -end fixedly connected with first connecting pipe. In the utility model, supercritical CO2 replaces traditional solvent, realizes green high -efficient reaction, adopts composite stirring system, combines ultrasonic vibrator and scraper structure, promotes mixing homogeneity and discharging efficiency, effectively solves material package problem, strengthens the process stability and the level of clean production.

Description

Technical Field

[0001] This utility model relates to the field of acrylic coating processing technology, and in particular to low-VOC acrylic coating processing equipment. Background Technology

[0002] Against the backdrop of increasingly stringent environmental policies, low-VOC (volatile organic compound) acrylic coatings are widely used in various fields such as construction, automobiles, and electronics due to their excellent environmental performance. With the deepening promotion of the green manufacturing concept, developing efficient, environmentally friendly, and energy-saving coating production technologies has become a key direction for industry development.

[0003] Currently, low-VOC acrylic coating processing equipment mostly uses traditional solvent systems or high-shear mixing methods, resulting in problems such as high solvent residue, significant environmental pollution, and poor mixing uniformity. Especially during the mixing of high-viscosity resins and powder materials, the phenomenon of "resin coating the powder" easily occurs, leading to uneven reaction and unstable product quality. Furthermore, existing equipment is insufficient in terms of mixing efficiency, thorough discharge, and cleanliness, affecting production efficiency and the stability of subsequent batches. Therefore, there is an urgent need for a new, green, efficient, and uniformly mixing processing device to solve these technical challenges. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low-VOC acrylic coating processing equipment. This equipment uses supercritical CO2 to replace traditional solvents, achieving a green and efficient reaction. It employs a composite stirring system, combining an ultrasonic transducer and a scraper structure, to improve mixing uniformity and discharge efficiency, effectively solving the problem of material encapsulation and enhancing process stability and clean production levels.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-VOC acrylic coating processing equipment, comprising a reaction vessel, a motor fixedly connected to the middle of the upper end of the reaction vessel, a rotating shaft fixedly connected to the drive end of the motor, an inner spiral propeller fixedly connected to the outer wall of the middle of the rotating shaft, a fixing rod fixedly connected to the outer wall of the rotating shaft, an outer spiral propeller fixedly connected to the outer side of the fixing rod, an ultrasonic transducer provided on the surface of the outer spiral propeller, an air inlet provided on the left side of the upper end of the reaction vessel, a small booster pump fixedly connected to the right side of the upper end of the reaction vessel, a first connecting pipe fixedly connected to the right end of the small booster pump, a three-way valve fixedly connected to the middle of the first connecting pipe, a second connecting pipe fixedly connected to the lower end of the three-way valve, and the lower end of the second connecting pipe communicating with the interior of the reaction vessel.

[0006] Furthermore, a frame-type agitator is fixedly connected to the outer wall of the rotating shaft, a side scraper is fixedly connected to the outer side of the frame-type agitator, and a bottom scraper is fixedly connected to the lower end of the frame-type agitator.

[0007] Furthermore, a jacket is fixedly connected to the outer wall of the reactor, and a spiral channel is opened inside the jacket.

[0008] Furthermore, an oil inlet is provided at the lower left end of the jacket, and an oil outlet is provided at the upper left end of the jacket.

[0009] Furthermore, a discharge port is fixedly connected to the middle of the lower end of the reactor, and a discharge valve is provided in the middle of the discharge port.

[0010] Furthermore, a support leg is fixedly connected to the lower end of the reactor, and a one-way valve is provided in the middle of the air inlet.

[0011] Furthermore, the upper end of the rotating shaft is rotatably connected to the upper end of the reactor, and a mechanical seal is provided at the connection.

[0012] Furthermore, a feeding port is provided on the front side of the upper end of the reactor, and a sealing cap is provided on the upper end of the feeding port.

[0013] This utility model has the following beneficial effects: 1. In this utility model, by controlling temperature and pressure conditions, carbon dioxide is brought to a supercritical state, which combines the high density of liquids with the low viscosity and high diffusivity of gases. It effectively replaces traditional organic solvents as reaction media, which not only reduces environmental pollution and solvent residue risks, but also improves material mass transfer efficiency and reaction uniformity, providing a reliable technical path for green chemical production.

[0014] 2. In this invention, the device is equipped with a composite mixing system consisting of an inner spiral impeller, an outer spiral impeller, and a frame agitator. Combined with a material circulation method with opposite spiral directions, it achieves three-dimensional and thorough mixing of materials within the reactor. The ultrasonic transducer integrated on the surface of the outer spiral impeller utilizes the cavitation effect to disrupt the surface tension of the material, preventing the phenomenon of "resin encapsulating powder." Simultaneously, the side scrapers and inclined bottom scrapers effectively remove residues from the reactor wall and bottom, improving discharge efficiency and cleanliness. The overall structure significantly enhances the mixing effect and process stability. Attached Figure Description

[0015] Figure 1 A perspective view of the low-VOC acrylic coating processing equipment proposed in this utility model; Figure 2 This is a cross-sectional view of the reaction vessel of the low-VOC acrylic coating processing equipment proposed in this utility model; Figure 3 This is a structural diagram of a small booster pump for a low-VOC acrylic coating processing equipment proposed in this utility model.

[0016] Legend: 1. Reactor; 2. Motor; 3. Rotating shaft; 4. Inner spiral propeller; 5. Outer spiral propeller; 6. Ultrasonic vibrator; 7. Fixed rod; 8. Frame agitator; 9. Side scraper; 10. Bottom scraper; 11. Jacket; 12. Spiral channel; 13. Oil inlet; 14. Oil outlet; 15. Discharge outlet; 16. Air inlet; 17. Small booster pump; 18. First connecting pipe; 19. Three-way valve; 20. Second connecting pipe; 21. Feeding port; 22. Support leg. Detailed Implementation

[0017] 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.

[0018] Reference Figures 1-3 This utility model provides an embodiment of a low-VOC acrylic coating processing equipment, comprising a reaction vessel 1, a motor 2 fixedly connected to the middle of the upper end of the reaction vessel 1, a rotating shaft 3 fixedly connected to the drive end of the motor 2, the upper end of the rotating shaft 3 being rotatably connected to the upper end of the reaction vessel 1, and a mechanical seal being provided at the connection point; an inner spiral blade 4 fixedly connected to the outer wall of the middle of the rotating shaft 3, a fixed rod 7 fixedly connected to the outer wall of the rotating shaft 3, an outer spiral blade 5 fixedly connected to the outer side of the fixed rod 7, an ultrasonic transducer 6 being provided on the surface of the outer spiral blade 5, a frame-type agitator 8 fixedly connected to the outer wall of the rotating shaft 3, a side scraper 9 fixedly connected to the outer side of the frame agitator 8, a bottom scraper 10 fixedly connected to the lower end of the frame agitator 8, an air inlet 16 being provided on the left side of the upper end of the reaction vessel 1, and a single air inlet 16 being provided in the middle of the air inlet 16. A small booster pump 17 is fixedly connected to the upper right side of the reactor 1. A first connecting pipe 18 is fixedly connected to the right end of the small booster pump 17. A three-way valve 19 is fixedly connected to the middle of the first connecting pipe 18. A second connecting pipe 20 is fixedly connected to the lower end of the three-way valve 19. The lower end of the second connecting pipe 20 communicates with the interior of the reactor 1. A jacket 11 is fixedly connected to the outer wall of the reactor 1. A spiral channel 12 is opened inside the jacket 11. An oil inlet 13 is set at the lower left end of the jacket 11. An oil outlet 14 is set at the upper left end of the jacket 11. A discharge port 15 is fixedly connected to the middle of the lower end of the reactor 1. A discharge valve is set in the middle of the discharge port 15. A support leg 22 is fixedly connected to the lower end of the reactor 1. A feeding port 21 is set on the front side of the upper end of the reactor 1. A sealing cap is set on the upper end of the feeding port 21.

[0019] Specifically, when using this device, acrylic resin monomers and various additives are first added to reactor 1 through feed port 21, and then feed port 21 is tightly sealed with a sealing cap. Next, carbon dioxide gas is introduced into reactor 1 through air inlet 16, and the original gas in reactor 1 is discharged using three-way valve 19. Then, the three-way valve 19 and the one-way valve of air inlet 16 are closed to ensure good system sealing. To make carbon dioxide reach a supercritical state, hot oil is injected into the spiral channel 12 in jacket 11 through oil inlet 13 to control the internal temperature of reactor 1 at about 35°C. At the same time, the pressure inside reactor 1 is increased to about 7.4 MPa using a small booster pump 17. Under these conditions, carbon dioxide exhibits a high density similar to a liquid, while possessing the low viscosity and high diffusivity of a gas, making it an ideal reaction medium and minimizing VOC content. At this time, motor 2 is started, driving the rotating shaft 3 to rotate, which in turn drives the inner spiral impeller 4, the outer spiral impeller 5, and the frame agitator 8 to work together. The inner spiral propeller 4 and the outer spiral propeller 5 have opposite spiral directions; one lifts the material upwards, while the other pushes it downwards, achieving three-dimensional circulation and mixing of the material within the reactor 1. The ultrasonic transducer 6 mounted on the surface of the outer spiral propeller 5 generates ultrasonic waves, effectively disrupting the surface tension of the material through cavitation, thus completely solving the common problem of "resin-encapsulated powder" in traditional processes and achieving a more uniform mixing effect. Simultaneously, the side scraper 9 on the outside of the frame agitator 8 and the bottom scraper 10 at the bottom rotate with the agitator, continuously scraping away material adhering to the inner wall and bottom of the reactor 1. The bottom scraper 10 is at a 45-degree angle to the direction of rotation, effectively pushing residual material towards the discharge port 15, ensuring thorough and complete discharge. After the material has fully reacted, the gas inside the reactor 1 is discharged through the three-way valve 19, and then the discharge valve is opened to discharge the uniformly mixed finished material, completing the entire reaction process.

[0020] Working Principle: When using this device, acrylic resin monomers, additives, and other raw materials are first fed into the reactor 1 through the feeding port 21. The feeding port 21 is then sealed with a sealing cap, and carbon dioxide gas is introduced into the reactor 1 through the gas inlet 16. The gas in the reactor 1 is discharged outward through the three-way valve 19. Then, hot oil is introduced into the spiral channel 12 inside the jacket 11 through the oil inlet 13 to control the temperature inside the reactor 1 at about 35°C. The pressure inside the reactor 1 is then controlled at about 7.4 MPa by a small booster pump 17, so that the carbon dioxide reaches a supercritical state. At this point, it combines the high density of a liquid with the low viscosity and high diffusivity of a gas. Restart motor 2, which drives rotating shaft 3 to rotate. The inner spiral blade 4, outer spiral blade 5, and frame agitator 8 rotate accordingly, ensuring thorough mixing and reaction of the material and supercritical carbon dioxide. The inner and outer spiral blades 4 and 5 have different spiral directions; one tumbles the material upwards, while the other pushes it downwards, resulting in more uniform mixing. The ultrasonic transducer 6 on the surface of the outer spiral blade 5 utilizes ultrasonic cavitation to break down the surface tension of the material, solving the problem of "resin-encapsulated powder" in traditional equipment and ensuring more uniform mixing. The side scraper 9 on the outer side and the bottom scraper 10 on the bottom side of the frame agitator 8 rotate with it, scraping away the material adhering to the inner wall of the reactor 1. The bottom scraper 10 forms a 45-degree angle with the rotation direction, pushing the adhering material towards the discharge port 15. After the reaction is complete, the gas in the reactor 1 is discharged through the three-way valve 19, and the mixed material is discharged through the discharge valve.

[0021] It is worth noting that the circuits, protection, and sealing involved in the above embodiments are all based on the corresponding existing technologies according to the actual situation, and therefore will not be described in detail in the embodiments of this application.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Low-VOC acrylic coating processing equipment, including a reaction vessel (1), characterized in that: A motor (2) is fixedly connected to the middle of the upper end of the reactor (1). A rotating shaft (3) is fixedly connected to the driving end of the motor (2). An inner spiral propeller (4) is fixedly connected to the outer wall of the middle part of the rotating shaft (3). A fixing rod (7) is fixedly connected to the outer wall of the rotating shaft (3). An outer spiral propeller (5) is fixedly connected to the outside of the fixing rod (7). An ultrasonic transducer (6) is provided on the surface of the outer spiral propeller (5). An air inlet (16) is provided on the left side of the upper end of the reactor (1). A small booster pump (17) is fixedly connected to the right side of the upper end of the reactor (1). A first connecting pipe (18) is fixedly connected to the right end of the small booster pump (17). A three-way valve (19) is fixedly connected to the middle part of the first connecting pipe (18). A second connecting pipe (20) is fixedly connected to the lower end of the three-way valve (19). The lower end of the second connecting pipe (20) is connected to the inside of the reactor (1).

2. The low-VOC acrylic coating processing equipment according to claim 1, characterized in that: A frame-type agitator (8) is fixedly connected to the outer wall of the rotating shaft (3), a side scraper (9) is fixedly connected to the outer side of the frame-type agitator (8), and a bottom scraper (10) is fixedly connected to the lower end of the frame-type agitator (8).

3. The low-VOC acrylic coating processing equipment according to claim 1, characterized in that: The outer wall of the reactor (1) is fixedly connected to a jacket (11), and a spiral channel (12) is opened inside the jacket (11).

4. The low-VOC acrylic coating processing equipment according to claim 3, characterized in that: The lower left end of the jacket (11) is provided with an oil inlet (13), and the upper left end of the jacket (11) is provided with an oil outlet (14).

5. The low-VOC acrylic coating processing equipment according to claim 1, characterized in that: The reactor (1) is fixedly connected to a discharge port (15) at the middle of its lower end, and a discharge valve is provided in the middle of the discharge port (15).

6. The low-VOC acrylic coating processing equipment according to claim 1, characterized in that: The lower end of the reactor (1) is fixedly connected to a support leg (22), and a one-way valve is provided in the middle of the air inlet (16).

7. The low-VOC acrylic coating processing equipment according to claim 1, characterized in that: The upper end of the rotating shaft (3) is rotatably connected to the upper end of the reactor (1), and a mechanical seal is provided at the connection.

8. The low-VOC acrylic coating processing equipment according to claim 1, characterized in that: The reactor (1) is provided with a feeding port (21) on the front side of the upper end, and a sealing cap is provided on the upper end of the feeding port (21).

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