Feeding device for acrylate emulsion polymerization

Abstract

The utility model provides a feeding device for acrylate emulsion polymerization, which belongs to the technical field of emulsion polymerization feeding and comprises a feeding tank. The tank cover is arranged at the top of the feeding tank; the feeding hopper and the nitrogen inlet pipe are arranged on the top of the tank cover, and the feeding hopper is located on one side of the nitrogen inlet pipe; the discharging valve is arranged at the bottom of the feeding tank; the nitrogen and oxygen replacement assembly is arranged in the feeding tank; the nitrogen and oxygen replacement assembly comprises a buoyancy lifting disc arranged in the feeding tank and a nitrogen and oxygen replacement assembly arranged in the feeding tank, the U-shaped pipe is arranged in the center of the top of the buoyancy lifting disc; the oxygen discharge straight pipe is arranged at one end of the U-shaped pipe; according to the utility model, nitrogen and oxygen in the feeding tank are replaced, so that the content of the oxygen in the feeding tank is ensured, the oxygen is prevented from entering the polymerization kettle along with a reagent, and the damage of molecular chains caused by oxidation reaction of acrylate emulsion in the polymerization kettle is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of emulsion polymerization feeding technology, specifically relating to a feeding device for acrylate emulsion polymerization. Background Technology

[0002] In the emulsion polymerization of acrylates, various formulations need to be prepared, including emulsifiers, catalysts, regulators, postmixes, etc. These formulations are added to the polymerization reactor in a certain time sequence, and the polymerization reaction takes place in the polymerization reactor.

[0003] Since these reagents need to be added through the feed hole on the polymerization reactor, the feed hole is open during feeding, and the space inside the polymerization reactor is connected to the external environment. Air will enter the polymerization reactor along with the reagents. Since the air contains oxygen, the oxygen will react with the acrylic emulsion after entering the polymerization reactor, destroying the integrity of the molecular chain and resulting in poor quality of the prepared acrylic emulsion.

[0004] Therefore, a feeding device for acrylate emulsion polymerization is proposed. Utility Model Content

[0005] This invention provides a feeding device for acrylate emulsion polymerization, the purpose of which is to solve the problems mentioned above.

[0006] This utility model provides a feeding device for acrylic emulsion polymerization, including a feeding tank; a tank cover at the top of the feeding tank; a feed hopper and a nitrogen inlet pipe at the top of the tank cover, the feed hopper being located on one side of the nitrogen inlet pipe; a discharge valve at the bottom of the feeding tank; and a nitrogen-oxygen replacement assembly in the feeding tank; wherein the nitrogen-oxygen replacement assembly includes: a buoyancy lifting plate inside the feeding tank; a U-shaped tube at the center of the top of the buoyancy lifting plate; an oxygen discharge straight pipe at one end of the U-shaped tube; a connecting cavity at the center of the bottom of the buoyancy lifting plate; an air hole on the outer wall of the connecting cavity; a guide plug at the bottom of the air hole; a hollow ring at the bottom of the buoyancy lifting plate near the outer side of the connecting cavity; and a guide post at the center of the top of the U-shaped tube.

[0007] Furthermore, a feed pipe is provided at the bottom of the can lid near the feed valve, and an air pressure balance hole is provided at the upper part of the outer side wall of the feed pipe.

[0008] Furthermore, a transparent window is embedded in the outer wall of the feeding tank, and a ring is provided at the bottom of the feeding tank near the outer side of the oxygen discharge straight pipe. A fastening screw is threadedly connected to one side of the outer wall of the ring.

[0009] Furthermore, both the feed pipe and the feed hopper are connected to the feed valve, and a gap is provided between the bottom end of the feed pipe and the bottom of the feed tank.

[0010] By adopting the above technical solution, the acrylic emulsion can be allowed to flow into the feeding tank through intervals.

[0011] Furthermore, both the oxygen discharge straight pipe and the connecting cavity are connected to the U-shaped pipe, and the connecting cavity is connected to the air hole;

[0012] By adopting the above technical solution, the inverted U-shaped tube can prevent the acrylic emulsion from flowing into the oxygen exhaust straight pipe, thus achieving the purpose of obstructing the flow of the acrylic emulsion. The interconnected structure allows the gas and acrylic emulsion to flow together.

[0013] Furthermore, the cross-section of the flow guide plug is a right-angled triangle, and the top of the flow guide plug is an inclined surface, with the lower end of the inclined surface facing the connecting cavity;

[0014] By adopting the above technical solution, the flow guide plug has the ability to tilt and guide the flow, thereby causing the acrylic emulsion entering the pore to move downward, avoiding the accumulation of acrylic emulsion and affecting the discharge of oxygen in the air.

[0015] Furthermore, the top end of the guide post passes through the top of the tank cover, and the bottom end of the oxygen discharge straight pipe passes through the bottom of the feeding tank. Sealing rings are provided at the penetration points of the guide post and the tank cover, as well as at the penetration points of the oxygen discharge straight pipe and the feeding tank.

[0016] By adopting the above technical solution, sealing rings are used to ensure airtightness.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention replaces oxygen in the feeding tank with nitrogen, ensuring the oxygen content in the feeding tank and thus preventing oxygen from entering the polymerization reactor along with the reagents, thereby preventing the acrylate emulsion in the polymerization reactor from undergoing an oxidation reaction that would damage the molecular chains.

[0019] The nitrogen-oxygen replacement component separates oxygen from the acrylate emulsion, allowing oxygen to be discharged under nitrogen pressure and preventing the acrylate emulsion from being discharged from the feed tank. The buoyancy lifting plate, which moves with the reagent liquid level, ensures that the vent is positioned above the reagent liquid level, providing a channel for oxygen to flow out and facilitating the replacement of nitrogen and oxygen.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is an exploded view of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional view of the nitrogen-oxygen replacement component according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the external structure of the nitrogen-oxygen replacement component according to an embodiment of the present invention;

[0026] Reference numerals: 1. Feeding tank; 2. Tank cover; 3. Feed valve; 4. Feed hopper; 5. Discharge valve; 6. Nitrogen inlet pipe; 7. Nitrogen-oxygen replacement assembly; 71. Buoyancy lifting plate; 72. U-shaped pipe; 73. Oxygen discharge straight pipe; 74. Connecting cavity; 75. Air hole; 76. Flow guide plug; 77. Hollow ring; 78. Guide column; 8. Feed pipe; 9. Air pressure balance hole; 10. Transparent window; 11. Ring sleeve; 12. Fastening screw. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] Reference Figure 1-4This utility model embodiment proposes a feeding device for acrylic emulsion polymerization, including a feeding tank 1, a tank cover 2 at the top of the feeding tank 1, a feed valve 3 at the top of the tank cover 2, a feed hopper 4 at the top of the feed valve 3, a discharge valve 5 at the center of the bottom of the feeding tank 1, and a nitrogen inlet pipe 6 at the center of the top of the tank cover 2. One end of the nitrogen inlet pipe 6 is connected to a nitrogen pressure pump, which draws nitrogen into the nitrogen inlet pipe 6 and allows the nitrogen to enter the feeding tank 1.

[0029] The bottom of the feeding tank 1 is penetrated by an oxygen discharge straight pipe 73 from the nitrogen-oxygen replacement assembly 7. A U-shaped pipe 72 is installed at the top of the oxygen discharge straight pipe 73, and a buoyancy lifting plate 71 is installed at one end of the U-shaped pipe 72. A connecting cavity 74 is opened at the center of the bottom of the buoyancy lifting plate 71, and vents 75 are axially spaced at equal intervals on the outer wall of the buoyancy lifting plate 71. The oxygen discharge straight pipe 73 and the connecting cavity 74 are both connected to the U-shaped pipe 72, and the connecting cavity 74 is connected to the vents 75. The inverted U-shaped pipe 72 prevents the acrylic emulsion from flowing into the oxygen discharge straight pipe 73, thus obstructing the flow of the acrylic emulsion. The interconnected structure allows gas and acrylic emulsion to flow. A guide plug 76 is installed at the bottom of the vent 75. The cross-section of 76 is a right-angled triangle, and the top of the flow guide plug 76 is a slope, with the lower end of the slope facing the connecting cavity 74, which gives the flow guide plug 76 the ability to guide flow at an angle, thereby causing the acrylic emulsion entering the air hole 75 to move downward, avoiding the accumulation of acrylic emulsion and affecting the discharge of oxygen in the air. A hollow ring 77 is provided at the bottom of the buoyancy lifting plate 71 near the outer side of the connecting cavity 74. A guide post 78 is provided at the top center of the U-shaped tube 72. The top of the guide post 78 passes through the top of the tank cover 2. The bottom end of the oxygen discharge straight pipe 73 passes through the bottom of the feeding tank 1. Sealing rings are provided at the penetration positions of the guide post 78 and the tank cover 2, as well as at the penetration positions of the oxygen discharge straight pipe 73 and the feeding tank 1, to ensure airtightness.

[0030] A feed pipe 8 is provided at the bottom of the can lid 2 near the feed valve 3. Both the feed pipe 8 and the feed hopper 4 are connected to the feed valve 3. A gap is provided between the bottom end of the feed pipe 8 and the bottom of the feed tank 1. The gap allows the acrylic emulsion to flow into the feed tank 1. An air pressure balance hole 9 is provided at the upper position on the outer side wall of the feed pipe 8. A transparent window 10 is embedded in one side of the outer wall of the feed tank 1.

[0031] A ring 11 is provided at the bottom of the feeding tank 1 near the outer side of the oxygen discharge straight pipe 73. A fastening screw 12 is connected to one side of the outer wall of the ring 11 by thread. The oxygen discharge straight pipe 73 can be manually fixed by squeezing the fastening screw 12, thereby limiting the height of the buoyancy lifting plate 71.

[0032] The specific implementation method is as follows: When feeding the acrylate emulsion in the polymerization process, the acrylate emulsion undergoes polymerization reaction in the polymerization reactor. The discharge valve 5 at the bottom of the feeding tank 1 is connected and fixed to the feeding port of the polymerization reactor. When feeding, the feed valve 3 is opened, and the required emulsifiers, catalysts, regulators, post-mixing agents and other reagents are added to the feeding tank 1 through the feed hopper 4. Then, the feed valve 3 is closed.

[0033] During the reagent addition process, the reagent and air enter the feeding tank 1 together. Oxygen in the air fills the feeding tank 1. When the reagent accumulates at the bottom of the feeding tank 1, as the amount of reagent increases, the buoyancy lifting plate 71 rises synchronously with the rise of the reagent liquid level under the action of buoyancy. After the reagent addition is completed, the external nitrogen pressure pump is controlled to draw nitrogen into the nitrogen inlet pipe 6, so that the nitrogen enters the feeding tank 1. Since nitrogen is lighter than oxygen, the nitrogen accumulates at the top of the feeding tank 1. Under the push of nitrogen, the oxygen enters the vent 75 under pressure and is discharged through the U-shaped pipe 72 and the oxygen discharge straight pipe 73 in sequence, thereby replacing the oxygen in the feeding tank 1 and preventing oxygen from entering the polymerization reactor and causing an oxidation reaction that would damage the integrity of the molecular chain.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A feeding device for acrylic emulsion polymerization, characterized in that: Including the feeding tank (1); A can lid (2) is provided on the top of the feeding tank (1); A feed hopper (4) and a nitrogen inlet pipe (6) are provided on the top of the can lid (2), with the feed hopper (4) located on one side of the nitrogen inlet pipe (6); The discharge valve (5) is located at the bottom of the feeding tank (1); and Nitrogen-oxygen replacement assembly (7) is installed in the feeding tank (1); The nitrogen-oxygen replacement component (7) includes: A buoyancy lifting plate (71) is installed inside the feeding tank (1). A U-shaped tube (72) is provided at the center of the top of the buoyancy lifting plate (71); An oxygen exhaust straight pipe (73) is provided at one end of the U-shaped tube (72); A connecting cavity (74) is opened at the center of the bottom of the buoyancy lifting plate (71); Air vents (75) are formed on the outer wall of the connecting cavity (74); A flow guide plug (76) is provided at the bottom of the inside of the air hole (75); A hollow ring (77) is located at the bottom of the buoyancy lifting plate (71) near the outer side of the connecting cavity (74). A guide post (78) is located at the center of the top of the U-shaped tube (72).

2. The feeding device for emulsion polymerization of acrylate according to claim 1, characterized in that: A feed pipe (8) is provided at the bottom of the can cover (2) near the feed valve (3), and an air pressure balance hole (9) is provided at the upper part of the outer side wall of the feed pipe (8).

3. The feeding device for emulsion polymerization of acrylate according to claim 1, characterized in that: A transparent window (10) is embedded in the outer wall of the feeding tank (1), and a ring (11) is provided at the bottom of the feeding tank (1) near the outer side of the oxygen discharge straight pipe (73). A fastening screw (12) is connected to one side of the outer wall of the ring (11) by threaded engagement.

4. The feeding device for emulsion polymerization of acrylate according to claim 2, characterized in that: Both the feed pipe (8) and the feed hopper (4) are connected to the feed valve (3), and there is a gap between the bottom end of the feed pipe (8) and the bottom of the feed tank (1).

5. The feeding device for emulsion polymerization of acrylate according to claim 1, characterized in that: The oxygen discharge straight pipe (73) and the connecting cavity (74) are both connected to the U-shaped pipe (72), and the connecting cavity (74) is connected to the air hole (75).

6. The feeding device for emulsion polymerization of acrylate according to claim 1, characterized in that: The cross-section of the flow guide plug (76) is a right triangle, and the top of the flow guide plug (76) is an inclined surface, with the lower end of the inclined surface facing the connecting cavity (74).

7. The feeding device for emulsion polymerization of acrylate according to claim 1, characterized in that: The top of the guide post (78) passes through the top of the tank cover (2), and the bottom of the oxygen discharge straight pipe (73) passes through the bottom of the feeding tank (1). Sealing rings are provided at the penetration positions of the guide post (78) and the tank cover (2), as well as at the penetration positions of the oxygen discharge straight pipe (73) and the feeding tank (1).

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