Reaction kettle for producing silicone acrylic emulsion

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a reaction kettle for producing silicone acrylic emulsion, which comprises a kettle body provided with a jacket and a stirring device, and a temperature exchange coil pipe is arranged in the jacket; the stirring device comprises a motor, a speed reducer and a stirring shaft, an anchor type stirring paddle is arranged at the bottom end of the stirring shaft, a plurality of groups of stirring paddles are uniformly arranged in the middle of the stirring shaft, each group of stirring paddles is symmetrically provided with two or three pairs of stirring blades, and each pair of stirring blades is obliquely upwards provided with a triangular flow increasing plate from the middle to the direction of the stirring shaft; a plurality of baffle plates are uniformly and fixedly arranged on the side wall of the kettle body, the baffle plates extend towards the center of the kettle body to form a plurality of radiating fins, and a plurality of radiating strips are uniformly and upwards arranged on each radiating fin; a liquid level radar assembly and a spraying assembly are arranged at the upper part of an inner cavity of the kettle body, and the spraying assembly is respectively communicated with a defoaming agent tank and a storage tank for materials to be dripped through pipelines; a ventilation coil is arranged at the bottom of the inner cavity of the kettle body. The equipment is simple, the uniform mixing effect is good, the heat dissipation is fast, and the yield and the quality of products are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and specifically relates to a reaction kettle for producing silicone-acrylic emulsion. Background Art

[0002] Silicone acrylic emulsion is an emulsion formed by adding suitable additives to organic silicon monomers containing unsaturated bonds and acrylic monomers through core-shell coating polymerization process. It has excellent properties such as pollution resistance and aging resistance of organic silane and good glossiness of acrylic resin. As an environmentally friendly emulsion and coating, it is widely used in the construction field. At present, in the production process of silicone acrylic emulsion, the reaction system in the reactor has the following defects during the polymerization process: 1. Bubbles will be generated during the reaction process, and sometimes the amount of bubbles generated is large. If not controlled, it will cause material leakage and other phenomena; 2. The added raw materials cannot be mixed quickly; 3. The viscosity of the reaction system will increase rapidly, causing the heat generated by the reaction to be unable to diffuse or exchange in time, which may cause safety hazards and is not conducive to the mixing of materials added later; the above defects can affect the output and quality of the product. Although it can be improved by improving the stirring method, it cannot completely solve the above problems. Therefore, other modifications are needed to overcome the above defects to ensure the output and quality of the product. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a reaction kettle for producing silicone-acrylic emulsion, which overcomes the defects in the prior art, has simple equipment, good mixing effect, fast heat dissipation, and ensures the output and quality of the product.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A reaction kettle for producing silicone-acrylic emulsion comprises a kettle body provided with a jacket and a stirring device, wherein a temperature-exchanging coil is arranged in the jacket; the stirring device comprises a motor, a reducer and a stirring shaft, wherein an anchor-type stirring paddle is arranged at the bottom end of the stirring shaft, and a plurality of groups of stirring paddles are evenly arranged in the middle of the stirring shaft, wherein each group of stirring paddles is symmetrically provided with two or three pairs of stirring blades, and each pair of stirring blades is provided with a triangular flow-increasing plate obliquely upward from the middle toward the stirring shaft; a plurality of baffles are evenly fixedly arranged on the side wall of the kettle body, wherein a plurality of heat sinks are extended from the baffles toward the center of the kettle body, and a plurality of heat sinks are evenly arranged upward on each heat sink; a liquid level radar assembly and a spray assembly are arranged at the upper part of the inner cavity of the kettle body, and the spray assembly is respectively connected to a defoaming agent tank and various material storage tanks to be dripped through a pipeline, a flow meter, an electromagnetic valve and a pump; and a ventilation coil is arranged at the bottom of the inner cavity of the kettle body.

[0006] Preferably, the top of the kettle body is provided with an air outlet, and the bottom is provided with a material outlet; a remote temperature sensor is provided in the kettle body.

[0007] Preferably, both ends of the temperature exchange coil are connected to a temperature exchange medium supply device and a temperature exchange medium recovery device through pipelines and regulating valves respectively.

[0008] Preferably, the baffle is evenly provided with a plurality of liquid permeable holes. The baffle has the functions of baffle and heat dissipation, and the liquid permeable holes are conducive to the flow of materials, so that the materials in the kettle are stirred and mixed more thoroughly.

[0009] Preferably, the flow increasing plate is provided with a plurality of hollow holes to reduce the stirring resistance during stirring, form a vortex, and make the stirring more uniform.

[0010] Preferably, the spray assembly includes a spray pipe extending from outside the reactor into the inner cavity of the reactor. After entering the inner cavity of the reactor, the spray pipe is bent around the stirring shaft to form a circular tube, and three spray heads are evenly and equally arranged on the circular tube.

[0011] Preferably, the liquid level radar assembly includes three liquid level radars evenly arranged, the three liquid level radars are interconnected by three connecting rods, and the connection points at both ends of the three connecting rods are fixedly connected to the top of the reactor through fixing rods; the three liquid level radars are electrically connected to the DCS automatic control system through wires.

[0012] Furthermore, the model of the liquid level radar is VEGAPULS 64, and the manufacturer is VEGAPULS (China) Instrument Co., Ltd. It is a radar sensor that operates at a frequency of 80 GHz and is suitable for tank containers with a large number of internal parts.

[0013] Preferably, the model of the flow meter is LUXQ-020A, the manufacturer is Jiangsu Mingyu Instrument Technology Co., Ltd., the material is stainless steel 1Cr18Ni9Ti, and the flow range is 1.52-15m 3 / h.

[0014] Preferably, the solenoid valve is a direct-acting solenoid valve, model MF08, manufactured by Yige Fluid Technology (Zhejiang) Co., Ltd., working pressure: 0-25 bar, and the valve sealing material is fluororubber.

[0015] Preferably, the air inlet of the ventilation coil is connected to the nitrogen input device through a pipeline, a regulating valve and an air intake pump.

[0016] Preferably, the regulating valve, motor, flow meter, solenoid valve, air inlet pump of the ventilation coil, etc. of the temperature exchange coil are all electrically connected to a DCS automatic control system to automatically control the reaction of the entire reactor.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] The utility model adds a spray device to change the material dripping into spraying, which is more conducive to mixing the material, and can spray a defoaming agent to eliminate the foam generated by the reaction; the liquid level radar component monitors the material level and foam situation in real time, and can defoam in time when the foam reaches a certain level; the nitrogen input through the ventilation coil can be used for nitrogen protection, and can be conducive to mixing the material and taking away heat; the addition of the baffle and its accessories can increase the heat exchange area while assisting in mixing the material, so that the heat in the reaction system can be quickly exchanged; the change of the stirring device can also increase the stirring efficiency, and mix the material faster and better.

[0019] In short, the utility model has the advantages of simple equipment, good mixing effect, fast heat dissipation, and guaranteed product output and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0021] Among them, 1. kettle body; 2. anchor agitator; 3. flow enhancement plate; 4. baffle; 5. heat sink; 6. heat dissipation strip; 7. liquid level radar assembly; 8. spray assembly; 9. ventilation coil. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, a reaction kettle for producing silicone acrylic emulsion comprises a kettle body 1 provided with a jacket (not marked) and a stirring device (not marked), wherein a temperature-changing coil (not marked) is arranged in the jacket; the stirring device comprises a motor (not marked), a reducer (not marked) and a stirring shaft (not marked), an anchor-type stirring paddle 2 is arranged at the bottom of the stirring shaft, and a plurality of groups of stirring paddles (not marked) are evenly arranged in the middle of the stirring shaft, each group of stirring paddles is symmetrically provided with two pairs of stirring blades (not marked), and each pair of stirring blades is provided with a triangular amplifying member obliquely upward from the middle toward the stirring shaft. Flow plate 3; a number of baffles 4 are evenly fixed on the side wall of the kettle body 1, and a number of heat sinks 5 extend from the baffle 4 toward the center of the kettle body, and a number of heat sinks 6 are evenly upwardly arranged on each heat sink; a liquid level radar component 7 and a spray component 8 are provided on the upper part of the inner cavity of the kettle body 1, and the spray component 8 is connected to the defoaming agent tank (not marked) and the material storage tanks to be added (not marked) through a pipeline (not marked), a flow meter (not marked), an electromagnetic valve (not marked) and a pump (not marked); a ventilation coil 9 is provided at the bottom of the inner cavity of the kettle body 1.

[0024] In actual application, 800 kg of deionized water is added to the reactor, stirred at 40 rpm, and then 7 kg of sodium dodecyl polyoxyethylene ether sulfate, 0.5 kg of sodium phosphate, 7 kg of sodium 3-allyloxy-2-hydroxypropane sulfonate (COPS-1) and 2 kg of sodium bicarbonate are added in sequence through the spray component 8, and stirred for 15 minutes to dissolve and mix evenly to obtain a reactor liquid;

[0025] Heat the reaction kettle liquid to 75°C, introduce nitrogen through the ventilation coil 9 for 5 minutes and then remove the nitrogen; during the reaction, monitor the generation of bubbles in real time through the liquid level radar component 7, and spray the defoamer at any time if necessary; then add the seed monomer emulsion through the spray component 8, add the seed initiator solution after 3 minutes, continue to heat to 80°C, and keep warm for 30 minutes; after the insulation is completed, spray the core monomer emulsion into the reaction kettle with a metering pump, and add it for 3 hours; after spraying, add 200kg of acrylic acid, 5 min later, the shell initiator solution was added and the mixture was kept warm for 1 h; then, 50 kg of vinyl triisopropyl silane, 100 kg of γ-methacryloxypropyl triethoxy silane and 10 kg of sodium hydroxide (0.5 kg) of deionized water were sprayed into the reactor in sequence, stirred for 25 min, the temperature was maintained at 80°C and kept warm for 2 h; then, the material in the reactor was cooled to 50°C, 40 kg of ammonia dilution (10 kg of ammonia was diluted with 30 kg of water) was added, and then 33 kg of fungicide dilution (3 kg of BM6 was diluted with 30 kg of water) was added, and stirred for 30 min; the reaction in the reactor was completed, and the mixture was introduced into the filter reactor through the discharge port, and the discharge was filtered with a 200-mesh filter to obtain a silicone-acrylic emulsion.

[0026] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A reaction kettle for producing silicone-acrylic emulsion, characterized in that: It comprises a kettle body provided with a jacket and a stirring device, wherein a temperature-exchanging coil is arranged in the jacket; the stirring device comprises a motor, a reducer and a stirring shaft, an anchor-type stirring paddle is arranged at the bottom end of the stirring shaft, a plurality of groups of stirring paddles are evenly arranged in the middle of the stirring shaft, each group of stirring paddles is symmetrically provided with two or three pairs of stirring blades, and each pair of stirring blades is provided with a triangular flow-increasing plate obliquely upward from the middle toward the stirring shaft; a plurality of baffles are evenly fixed on the side wall of the kettle body, a plurality of heat sinks are extended from the baffles toward the center of the kettle body, and a plurality of heat sinks are evenly arranged upward on each heat sink; a liquid level radar assembly and a spray assembly are arranged on the upper part of the inner cavity of the kettle body, and the spray assembly is respectively connected to the defoaming agent tank and the material storage tanks to be dripped through a pipeline, a flow meter, an electromagnetic valve and a pump; a ventilation coil is arranged at the bottom of the inner cavity of the kettle body.

2. The reaction kettle for producing silicone-acrylic emulsion according to claim 1, characterized in that: The top of the kettle body is provided with an air outlet, and the bottom is provided with a material outlet; a remote temperature sensor is provided in the kettle body.

3. The reaction kettle for producing silicone-acrylic emulsion according to claim 1, characterized in that: The baffle is evenly provided with a plurality of liquid-permeable holes.

4. The reaction kettle for producing silicone-acrylic emulsion according to claim 1, characterized in that: The flow increasing plates are each provided with a plurality of hollow holes.

5. The reaction kettle for producing silicone-acrylic emulsion according to claim 1, characterized in that: The spray assembly comprises a spray pipe extending from the outside of the reactor into the inner cavity of the reactor. After entering the inner cavity of the reactor, the spray pipe is bent around the stirring shaft to form a circular tube, and three spray heads are evenly and equally arranged on the circular tube.

6. The reaction kettle for producing silicone-acrylic emulsion according to claim 1, characterized in that: The liquid level radar assembly comprises three liquid level radars evenly arranged, the three liquid level radars are mutually connected by three connecting rods, and the connection points at both ends of the three connecting rods are fixedly connected to the top of the reactor through fixing rods.

7. The reaction kettle for producing silicone-acrylic emulsion according to claim 1, characterized in that: The air inlet of the ventilation coil is connected to the nitrogen input device through a pipeline, a regulating valve and an air intake pump.

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