Water-based acrylate emulsion preparation defoaming device

Abstract

The defoaming device comprises a bottom plate, and a machine body is arranged at the top end of the bottom plate. When a storage tank stores raw materials, a detection element in a controller detects the concentration of waste gas in a machine body, judges whether the storage tank and a connecting pipeline leak or not and whether monomer volatilization exists or not, and if it is detected that waste gas exists, the waste gas is absorbed through an absorption mechanism, and the leaked waste gas is treated; in addition, a defoaming agent is also stored in the storage tank and is also directly added through the feeding pump in the reaction, and meanwhile, the defoaming agent is matched with the rotating pipe and the stirring rod to integrally rotate, so that the raw materials are stirred, and the defoaming effect is also achieved; according to the invention, double defoaming treatment of chemical defoaming and mechanical defoaming can be carried out on the water-based acrylate emulsion, and compared with a single defoaming mode, the defoaming effect is more obvious, and the defoaming efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of waterborne acrylic emulsion preparation technology, specifically to a defoaming device for waterborne acrylic emulsion preparation. Background Technology

[0002] Waterborne acrylic emulsions, as a type of waterborne coating based on acrylic resin, have become an important variety in the coatings industry due to their abundant raw material sources, ease of production and application, excellent weather resistance, strong adhesion, and good corrosion resistance. Their applications are wide-ranging, covering multiple fields such as architectural coatings, wood coatings, and industrial anti-corrosion coatings.

[0003] Foaming is a common problem in the production of waterborne acrylic emulsions. Therefore, defoamers need to be added during the preparation process to control or eliminate foam as early as possible, or defoaming can be achieved through physical methods. The use of defoamers is relatively simple; they can be added in quantitative batches during the preparation of the waterborne acrylic emulsion. Physical defoaming methods include mechanical centrifugal defoaming, thermal defoaming, and ultrasonic defoaming. Generally, during the preparation of waterborne acrylic emulsions, one defoaming method is often used to completely eliminate bubbles, achieving the desired bubble elimination effect and efficiency. Summary of the Invention

[0004] To solve the above-mentioned technical problems, a defoaming device for the preparation of waterborne acrylic emulsions is provided. This technical solution solves the problem that the use of defoamers mentioned in the background technology is relatively simple, and they can be added quantitatively in batches during the preparation of waterborne acrylic emulsions. Physical defoaming includes mechanical centrifugal defoaming, thermal defoaming, ultrasonic defoaming, etc. Generally, during the preparation of waterborne acrylic emulsions, a single defoaming method is often used to achieve the goal of completely eliminating bubbles, and the bubble elimination effect and efficiency reach the expected state.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A defoaming device for preparing water-based acrylic emulsion includes a base plate, an organic body at the top of the base plate, and an absorption mechanism installed at the top of the base plate and on the right side of the organic body. The organic body contains a reaction vessel, several sets of storage tanks, a first cylinder, and a second cylinder. The storage tanks are evenly distributed around the reaction vessel and are connected to the input end of a feed pump via pipes. The output end of the feed pump is connected to a discharge pipe. A stirring mechanism is installed inside the reaction vessel, and a controller is located at the front of the reaction vessel. The right side of the reaction vessel, near the top, is connected to the input end of an air pump via an air outlet pipe. The output end of the air pump is connected to the middle of a U-shaped tube via an air pipe, and the two ends of the U-shaped tube are connected to the first and second cylinders, respectively.

[0006] Preferably, the absorption mechanism includes a negative pressure fan, which is fixedly installed on the right side of the machine body near the top. Several sets of air intake channels are suspended inside the top of the machine body. The several sets of air intake channels are arranged at equal intervals, and the input end of the negative pressure fan is connected to the several sets of air intake channels.

[0007] Preferably, the output end of the negative pressure fan is connected to a first suction pipe, and a first reaction tower, a bidirectional pump and a liquid storage and regeneration tank are arranged at the front left side of the top of the base plate. The end of the first suction pipe away from the output end of the negative pressure fan is connected to the first reaction tower, and the sides of the first reaction tower and the liquid storage and regeneration tank that are close to each other are connected to the bidirectional pump through air pipes.

[0008] Preferably, the output end of the negative pressure fan is also connected to a second suction pipe. A second reaction tower and an alkali high-level tower are provided at the rear right side of the top of the base plate. There are two sets of the second reaction towers. The end of the second suction pipe away from the output end of the negative pressure fan is connected to one of the sets of the second reaction towers. The two sets of the second reaction towers and the second reaction tower on the right side and the alkali high-level tower are connected in sequence through air pipes.

[0009] Preferably, the stirring mechanism includes a rotating tube, and several sets of rotating tubes are rotatably connected inside the reactor. The top ends of the rotating tubes penetrate the inner top wall of the reactor and extend to the outside of the reactor. The end of the discharge tube away from the output end of the feed pump is rotatably connected to the top end of the rotating tube through a sealed bearing. Several sets of through holes are equidistantly opened on the outer surface of the rotating tube inside the reactor, and several sets of stirring rods are also equidistantly fixed to the outer surface of the rotating tube.

[0010] Preferably, a rotating wheel is installed on the outer surface of the top end of several sets of rotating tubes, and the several sets of rotating wheels are connected by a conveyor belt. A driven wheel is also fixedly connected to the outer surface of the top end of one set of rotating tubes, and a drive wheel is rotatably connected to the middle of the top end of the reactor. The drive wheel is connected to the driven wheel by a belt, and the middle of the top end of the drive wheel is fixedly connected to the output end of the drive motor. The drive motor is fixedly installed on the top end of the reactor by a mounting base.

[0011] Preferably, a vent pipe is connected to the top left of the first cylinder, and a gas valve is provided on the vent pipe. An igniter is fixedly installed at the rear left position of the top of the bottom plate, and the output end of the igniter extends to the bottom of the interior of the first cylinder.

[0012] Preferably, a dissolving cylinder is provided at the top of the second cylinder, and a liquid outlet valve is provided at the discharge end of the dissolving cylinder. A return air pump is fixedly installed at the front left side of the top of the bottom plate. The input end of the return air pump is connected to the interior of the second cylinder through an air pipe, and the output end of the return air pump is connected to one of the storage tanks through a return air pipe.

[0013] Preferably, an air pump is also installed at the top of the first cylinder, the input end of the air pump is connected to the interior of the first cylinder, and the output end of the air pump is connected to the dissolving cylinder.

[0014] Compared with the prior art, the present invention provides a defoaming device for the preparation of aqueous acrylic emulsions, which has the following beneficial effects: 1. When storing raw materials in storage tanks, in order to prevent leakage or improper storage, the detection element inside the controller can detect the concentration of exhaust gas inside the machine body, determine whether there is leakage in the storage tank and connecting pipes, and whether there is monomer volatilization. If exhaust gas is detected, it is absorbed by the absorption mechanism to treat the leaked exhaust gas, thereby improving the safety of raw material storage.

[0015] 2. In this invention, the defoamer is also stored in a storage tank and added directly to the reaction via a feed pump. Simultaneously, the rotating tube and stirring rod rotate as a whole, which not only stirs the raw materials but also defoams them. This invention can perform dual defoaming treatment of water-based acrylic emulsions using both chemical and mechanical methods. Compared with a single defoaming method, the defoaming effect is more significant and the defoaming efficiency is higher.

[0016] 3. During the preparation of water-based acrylic emulsions, the initiator usually decomposes, producing sulfur-containing compounds (such as sulfur dioxide and hydrogen sulfide). These gases have an irritating odor and can have a certain impact on human health. In addition, emulsifiers, dispersants, thickeners and other additives may be added during the preparation process. Some of these additives contain volatile organic compounds (VOCs). These substances cannot be directly discharged into the external environment after the reaction and need to be treated. Therefore, by starting the gas pump, the excess waste gas is directed into the first and second cylinders for reaction, which meets the needs of the staff. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the absorption mechanism in this invention; Figure 3 This is a schematic diagram of the internal structure of the machine body in this invention; Figure 4 This is a schematic diagram of the structure of the reaction vessel in this invention; Figure 5 This is a schematic diagram of the stirring mechanism in this invention; Figure 6 In this invention Figure 3 A schematic diagram of the enlarged structure at point A.

[0018] The numbers on the map are: 1. Base plate; 101. Machine body; 102. Reactor; 103. Controller; 104. Storage tank; 105. Feed pump; 106. Discharge pipe; 107. Vent pipe; 108. Air pump; 109. U-shaped pipe; 110. First cylinder; 111. Vent pipe; 112. Air pump; 113. Ignition device; 114. Second cylinder; 115. Dissolving cylinder; 116. Return air pump; 117. Return air pipe; 118. Liquid outlet valve; 2. Absorption mechanism; 201. Negative pressure fan; 202. Suction channel; 203. First suction pipe; 204. Second suction pipe; 205. First reaction tower; 206. Two-way pump; 207. Liquid storage and regeneration tank; 208. Second reaction tower; 209. Alkali high-level tower; 3. Stirring mechanism; 301. Rotating tube; 302. Through hole; 303. Stirring rod; 304. Rotating wheel; 305. Conveyor belt; 306. Mounting base; 307. Drive motor; 308. Drive wheel; 309. Driven wheel; 310. Belt. Detailed Implementation

[0019] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0020] Example 1 Please refer to Figure 1-6 As shown, a defoaming device for preparing water-based acrylic emulsion includes a base plate 1, an organic body 101 mounted on the top of the base plate 1, and an absorption mechanism 2 mounted on the top of the base plate 1 and on the right side of the organic body 101. Inside the organic body 101 are a reaction vessel 102, several sets of storage tanks 104, a first cylinder 110, and a second cylinder 114. The several sets of storage tanks 104 are evenly distributed around the reaction vessel 102, and each set of storage tanks 104 is connected to a feed pump 105 via a pipe. The inlet is connected, the output end of the feed pump 105 is connected to the outlet pipe 106, the inside of the reactor 102 is equipped with a stirring mechanism 3, and the front side of the reactor 102 is equipped with a controller 103. The right side of the reactor 102 near the top is connected to the input end of the air pump 108 through the air outlet pipe 107. The output end of the air pump 108 is connected to the middle part of the U-shaped pipe 109 through the air pipe, and the two ends of the U-shaped pipe 109 are connected to the first cylinder 110 and the second cylinder 114 respectively.

[0021] In this scheme, when the water-based acrylic emulsion is prepared and reacted in the reactor 102, a controller 103 is set up to control the output end of the feed pump 105 to pulse and transport the raw materials in the storage tank 104 to the reactor 102 for reaction. The detection element inside the controller 103 can also detect the concentration of exhaust gas inside the machine body 101 to determine whether there is a leak in the storage tank 104 and the connecting pipe. If a leak occurs, the leaked exhaust gas is absorbed by the absorption mechanism 2 and treated. The reaction mixture in the reactor 102 is stirred by the stirring mechanism 3 to remove foam. Furthermore, if there is any excess unreacted waste gas after the reaction is completed, the gas pump 108 is activated to allow the excess waste gas to enter the first cylinder 110 and the second cylinder 114 respectively for reaction. The waste gas and hydrogen react in the first cylinder 110 to produce hydrogen chloride gas, while the second cylinder 114 contains calcium hydroxide solution. After the calcium hydroxide solution reacts with the waste gas, it can generate calcium hypochlorite solution.

[0022] Example 2 Please refer to Figure 2 As shown, the absorption mechanism 2 includes a negative pressure fan 201, which is fixedly installed on the right side of the body 101 near the top. Several sets of air intake channels 202 are suspended inside the top of the body 101. The several sets of air intake channels 202 are arranged at equal intervals, and the input end of the negative pressure fan 201 is connected to the several sets of air intake channels 202.

[0023] Please refer to Figure 2 As shown, the output end of the negative pressure fan 201 is connected to the first suction pipe 203. The first reaction tower 205, the bidirectional pump 206 and the liquid storage and regeneration tank 207 are arranged at the front left side of the top of the base plate 1. The end of the first suction pipe 203 away from the output end of the negative pressure fan 201 is connected to the first reaction tower 205, and the sides of the first reaction tower 205 and the liquid storage and regeneration tank 207 that are close to each other are connected to the bidirectional pump 206 through air pipes.

[0024] In this scheme, when the detection element inside the controller 103 detects that the concentration of exhaust gas inside the machine body 101 exceeds 1 ppm and the leakage is less than 2,000 kg, it controls the negative pressure fan 201 to connect with the first reaction tower 205 and discharges the gas into the first reaction tower 205, allowing the absorbent liquid to quickly absorb the exhaust gas. Then, the purified gas is discharged back into the machine body 101 until the exhaust gas content inside the machine body 101 does not exceed the requirements. This allows the entire operation to form a closed loop, achieving the goals of environmental protection and ensuring safe production. At the same time, the alarm element in the controller 103 starts to sound an alarm, promptly alerting the personnel inside the machine body 101, enabling them to evacuate or handle the leaking tank in a timely manner, reducing the continued leakage of exhaust gas, effectively reducing the probability of personnel poisoning or injury caused by exhaust gas leakage, and ensuring the safety of the personnel.

[0025] Please refer to Figure 2 As shown, the output end of the negative pressure fan 201 is also connected to the second suction pipe 204. The second reaction tower 208 and the alkali high-level tower 209 are set at the rear right side of the top of the bottom plate 1. There are two sets of the second reaction tower 208, and the end of the second suction pipe 204 away from the output end of the negative pressure fan 201 is connected to one of the sets of the second reaction tower 208. The two sets of the second reaction tower 208 and the second reaction tower 208 on the right side and the alkali high-level tower 209 are connected in sequence through gas pipes.

[0026] In this scheme, when the detection element inside the controller 103 detects a leakage of more than 2,000 kilograms, the exhaust gas concentration detector 501 transmits the data to the control terminal 502, controls the negative pressure fan 201 to connect with the second reaction tower 208, and causes the exhaust gas to enter the second reaction tower 208 for reaction. The exhaust gas comes into countercurrent contact with the alkaline solution sprayed down from the second reaction tower 208 and is absorbed by the alkaline solution.

[0027] Example 3 Please refer to Figure 4 and Figure 5 As shown, the stirring mechanism 3 includes a rotating tube 301. Several sets of rotating tubes 301 are rotatably connected inside the reactor 102. The top ends of the rotating tubes 301 penetrate the inner top wall of the reactor 102 and extend to the outside of the reactor 102. The end of the discharge pipe 106 away from the output end of the feed pump 105 is rotatably connected to the top end of the rotating tube 301 through a sealed bearing. Several sets of through holes 302 are equidistantly opened on the outer surface of the rotating tube 301 inside the reactor 102. Several sets of stirring rods 303 are also equidistantly fixedly connected to the outer surface of the rotating tube 301.

[0028] Please refer to Figure 5As shown, rotating wheels 304 are installed on the outer surface of the top end of several sets of rotating tubes 301. The sets of rotating wheels 304 are connected by a transmission belt 305. A driven wheel 309 is also fixedly connected to the outer surface of the top end of one set of rotating tubes 301. A drive wheel 308 is rotatably connected to the middle of the top end of the reactor 102. The drive wheel 308 is connected to the driven wheel 309 by a belt 310. The middle of the top end of the drive wheel 308 is fixedly connected to the output end of the drive motor 307. The drive motor 307 is fixedly installed on the top end of the reactor 102 by a mounting base 306.

[0029] In this scheme, the output end of the drive motor 307 drives the drive wheel 308 to rotate, and the drive wheel 308 drives the driven wheel 309 to rotate through the belt 310, causing one set of rotating tubes 301 to rotate, which in turn causes the rotating wheels 304 connected to them to rotate synchronously. The several sets of rotating wheels 304 are all driven by the conveyor belt 305, thereby driving all the rotating tubes 301 to rotate synchronously, and causing the stirring rod 303 connected to them to rotate as well. This not only plays the role of mixing raw materials, but also plays the role of defoaming. It is noteworthy that, in this invention, each raw material, upon entering the reactor 102, first passes through the rotating tube 301 and then through the through-hole 302 before entering the reactor 102 itself. The rotation of the tube facilitates stirring and mixing. Due to the distribution of the through-holes and the rotation of the tube, the raw materials enter the reactor 102 in a dispersed state, further enhancing the contact and mixing effect between different raw materials. This allows for a more uniform distribution of the raw materials in the reaction system, avoiding situations where the concentration of raw materials is too high or too low in certain areas. Furthermore, the uniform mixing significantly increases the contact opportunities between reactant molecules. According to the principles of chemical reaction kinetics, the higher the effective collision frequency between reactant molecules, the faster the reaction rate. Therefore, this reaction method can significantly accelerate the reaction process, shorten the reaction time, and improve production efficiency.

[0030] Example 4 Please refer to Figure 3 As shown, a vent pipe 111 is connected to the top left of the first cylinder 110, and a gas valve is provided on the vent pipe 111. An igniter 113 is fixedly installed at the rear left position of the top of the bottom plate 1, and the output end of the igniter 113 extends to the bottom of the interior of the first cylinder 110.

[0031] Please refer to Figure 3 As shown, a dissolving cylinder 115 is provided at the top of the second cylinder 114, and a liquid outlet valve 118 is provided at the discharge end of the dissolving cylinder 115. A return air pump 116 is fixedly installed at the front left side of the top of the bottom plate 1. The input end of the return air pump 116 is connected to the interior of the second cylinder 114 through an air pipe, and the output end of the return air pump 117 is connected to one of the storage tanks 104 through a return air pipe 117.

[0032] Please refer to Figure 3 As shown, an air pump 112 is also installed at the top of the first cylinder 110. The input end of the air pump 112 is connected to the inside of the first cylinder 110, and the output end of the air pump 112 is connected to the dissolving cylinder 115.

[0033] In this scheme, after the exhaust gas enters the first cylinder 110, oxygen is added into the first cylinder 110 by opening the gas valve on the vent pipe 111. At the same time, the igniter 113 is activated to promote the combustion reaction of the exhaust gas at a certain temperature. After the exhaust gas enters the second cylinder 114, the second cylinder 114 contains a calcium hydroxide solution. After the calcium hydroxide solution reacts fully with the exhaust gas, a calcium hypochlorite solution can be generated.

[0034] Working principle and usage process of this invention: In the use of this invention, since the raw materials for preparing water-based acrylic emulsions are stored in several sets of storage tanks 104, if a storage tank 104 leaks or is improperly stored, the raw material monomers inside may decompose. These monomers may have an irritating odor or be toxic; for example, acrylic monomers can irritate the eyes, skin, and respiratory tract. Therefore, this invention uses a controller 103 installed on the reaction vessel 102. The detection element inside the controller 103 detects the concentration of waste gas inside the machine body 101, determining whether the storage tank 104 and connecting pipes are leaking, and whether monomers are evaporating. If waste gas is detected, it is absorbed by the absorption mechanism 2, treating the leaked waste gas in two ways: (1) When the detection element inside the controller 103 detects that the concentration of exhaust gas inside the machine body 101 exceeds 1 ppm and the leakage is less than 2,000 kg, it controls the negative pressure fan 201 to connect with the first reaction tower 205 and discharges the gas into the interior of the first reaction tower 205, so that the absorbent liquid can quickly absorb the exhaust gas. Then the purified gas is discharged back into the machine body 101 until the exhaust gas content inside the machine body 101 does not exceed the requirements. This way, the entire operation can form a closed loop to achieve the purpose of environmental protection and ensuring safe production. At the same time, the alarm element in the controller 103 starts to alarm, which promptly alerts the staff inside the machine body 101, so that the staff can evacuate or deal with the leaking tank in time to reduce the continued leakage of exhaust gas. This effectively reduces the probability of personnel poisoning and injury caused by exhaust gas leakage, and ensures the safety of the staff. (2) When the detection element inside the controller 103 detects that the leakage exceeds two thousand kilograms, the exhaust gas concentration detector 501 transmits the data to the control terminal 502, controls the negative pressure fan 201 to connect with the second reaction tower 208, and makes the exhaust gas enter the second reaction tower 208 to react. The exhaust gas comes into countercurrent contact with the alkaline solution sprayed down from the second reaction tower 208 and is absorbed by the alkaline solution.

[0035] Furthermore, when preparing an aqueous acrylic emulsion using this invention, the raw materials in the storage tank 104 are pulse-driven to the reaction vessel 102 via the output of the feed pump 105 for reaction. One set of storage tanks 104 stores defoaming agent. The output of the drive motor 307 drives the drive wheel 308 to rotate, which in turn drives the driven wheel 309 via the belt 310, causing one set of rotating tubes 301 to rotate. This causes the rotating wheels 304 connected to these tubes to rotate synchronously. All sets of rotating wheels 304 are connected by a conveyor belt 305, thus ensuring that all rotating tubes 301 rotate synchronously. This not only achieves the mixing of raw materials but also... It also serves to defoam. Each raw material, upon entering the reactor 102, first passes through the rotating tube 301 and then through the through-hole 302 before entering the reactor 102 itself. The rotation of the tube and the distribution of the through-holes ensure that the raw materials enter the reactor 102 in a dispersed state, further enhancing the contact and mixing effect between different raw materials. This allows for a more uniform distribution of the raw materials in the reaction system, preventing localized high or low concentrations. Furthermore, the uniform mixing significantly increases the contact opportunities between reactant molecules. According to the principles of chemical reaction kinetics, the higher the effective collision frequency between reactant molecules, the faster the reaction rate. Therefore, this reaction method can significantly accelerate the reaction process, shorten the reaction time, and improve production efficiency. In addition, we know that during the preparation of water-based acrylic emulsions, the initiator usually decomposes, producing sulfur-containing compounds (such as sulfur dioxide and hydrogen sulfide). These gases have an irritating odor and have a certain impact on human health. Furthermore, emulsifiers, dispersants, thickeners, and other additives may be added during the preparation process. Some of these additives contain volatile organic compounds (VOCs). These substances cannot be directly discharged into the external environment after the reaction and require certain treatment. Therefore, by starting the air pump 108, the excess waste gas is directed into the first cylinder 110 and the second cylinder 114 for reaction, thus meeting the needs of the staff.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A defoaming device for preparing aqueous acrylic emulsions, characterized in that, The system includes a base plate (1), with an organic body (101) mounted on the top of the base plate (1). An absorption mechanism (2) is installed on the top of the base plate (1) and on the right side of the organic body (101). Inside the organic body (101) are a reactor (102), several sets of storage tanks (104), a first cylinder (110), and a second cylinder (114). The several sets of storage tanks (104) are evenly distributed around the reactor (102), and each set of storage tanks (104) is connected to the input end of a feed pump (105) through a pipe. The output end of (105) is connected to the discharge pipe (106). The inside of the reactor (102) is equipped with a stirring mechanism (3), and a controller (103) is provided on the front side of the reactor (102). The right side of the reactor (102) near the top is connected to the input end of the air pump (108) through the air outlet pipe (107). The output end of the air pump (108) is connected to the middle part of the U-shaped pipe (109) through the air pipe, and the two ends of the U-shaped pipe (109) are connected to the first cylinder (110) and the second cylinder (114) respectively.

2. The defoaming device for preparing aqueous acrylic emulsions according to claim 1, characterized in that, The absorption mechanism (2) includes a negative pressure fan (201), which is fixedly installed on the right side of the body (101) near the top. Several sets of air intake channels (202) are suspended inside the top of the body (101). The several sets of air intake channels (202) are equidistantly arranged, and the input end of the negative pressure fan (201) is connected to the several sets of air intake channels (202).

3. The defoaming device for preparing aqueous acrylic emulsions according to claim 2, characterized in that, The output end of the negative pressure fan (201) is connected to the first suction pipe (203). The first reaction tower (205), the bidirectional pump (206) and the liquid storage and regeneration tank (207) are arranged at the front left side of the top of the base plate (1). The end of the first suction pipe (203) away from the output end of the negative pressure fan (201) is connected to the first reaction tower (205). The sides of the first reaction tower (205) and the liquid storage and regeneration tank (207) that are close to each other are connected to the bidirectional pump (206) through air pipes.

4. The defoaming device for preparing aqueous acrylic emulsions according to claim 2, characterized in that, The output end of the negative pressure fan (201) is also connected to a second suction pipe (204). A second reaction tower (208) and an alkali high-level tower (209) are set at the rear right side of the top of the base plate (1). There are two sets of the second reaction tower (208), and the end of the second suction pipe (204) away from the output end of the negative pressure fan (201) is connected to one of the sets of the second reaction tower (208). The two sets of the second reaction tower (208) and the second reaction tower (208) on the right side and the alkali high-level tower (209) are connected in sequence through gas pipes.

5. The defoaming device for preparing aqueous acrylic emulsions according to claim 1, characterized in that, The stirring mechanism (3) includes a rotating tube (301). Several sets of rotating tubes (301) are rotatably connected inside the reactor (102). The top ends of the several sets of rotating tubes (301) penetrate the inner top wall of the reactor (102) and extend to the outside of the reactor (102). The end of the discharge pipe (106) away from the output end of the feed pump (105) is rotatably connected to the top end of the rotating tube (301) through a sealed bearing. Several sets of through holes (302) are equidistantly opened on the outer surface of the rotating tube (301) inside the reactor (102). Several sets of stirring rods (303) are also equidistantly fixed on the outer surface of the rotating tube (301).

6. The defoaming device for preparing aqueous acrylic emulsions according to claim 5, characterized in that, A rotating wheel (304) is installed on the outer surface of the top end of several sets of rotating tubes (301). The rotating wheels (304) are connected to each other by a conveyor belt (305). A driven wheel (309) is also fixedly connected to the outer surface of the top end of one set of rotating tubes (301).

7. The defoaming device for preparing aqueous acrylic emulsions according to claim 6, characterized in that, A drive wheel (308) is rotatably connected to the top center of the reactor (102). The drive wheel (308) is connected to the driven wheel (309) via a belt (310). The top center of the drive wheel (308) is fixedly connected to the output end of the drive motor (307). The drive motor (307) is fixedly installed on the top of the reactor (102) via a mounting base (306).

8. The defoaming device for preparing aqueous acrylic emulsions according to claim 1, characterized in that, The top left of the first cylinder (110) is connected to a vent pipe (111), and a gas valve is provided on the vent pipe (111). An igniter (113) is fixedly installed at the rear left position of the top of the bottom plate (1), and the output end of the igniter (113) extends to the bottom of the inside of the first cylinder (110).

9. The defoaming device for preparing aqueous acrylic emulsions according to claim 1, characterized in that, The top of the second cylinder (114) is provided with a dissolving cylinder (115), and the discharge end of the dissolving cylinder (115) is provided with a liquid discharge valve (118). A return air pump (116) is fixedly installed at the front left side of the top of the bottom plate (1). The input end of the return air pump (116) is connected to the interior of the second cylinder (114) through an air pipe, and the output end of the return air pump (117) is connected to one of the storage tanks (104) through a return air pipe (117).

10. The defoaming device for preparing aqueous acrylate emulsions according to claim 1, characterized in that, The top of the first cylinder (110) is also equipped with an air pump (112), the input end of which is connected to the interior of the first cylinder (110), and the output end of which is connected to the dissolving cylinder (115).

Images