Preparation device of polytetrafluoroethylene aqueous dispersion liquid

Abstract

The utility model discloses a preparation device of polytetrafluoroethylene water-based dispersion liquid, which comprises a mixing tank, a tank cover is covered on the mixing tank, a mixing chamber, an isolation chamber and a clear liquid chamber are sequentially arranged in the mixing tank, the mixing chamber and the isolation chamber are separated by a front isolation plate, and the isolation chamber and the clear liquid chamber are separated by a rear isolation plate. A plurality of front overflow holes are formed in the front isolation plate, a plurality of rear overflow holes are formed in the rear isolation plate, a movable blocking plate is arranged in the isolation chamber, an adjusting screw rod is arranged at the upper end of the movable blocking plate, a stirring mechanism is installed in the mixing chamber, a feeding opening communicated with the mixing chamber is formed in the tank cover, and a discharging opening and a liquid discharging opening are formed in the bottom of the mixing tank. According to the preparation device of the polytetrafluoroethylene aqueous dispersion liquid, the unreacted perfluorocarboxylate anionic surfactant can be conveniently and effectively separated in the preparation process of the polytetrafluoroethylene aqueous dispersion liquid, and the recycling rate of the perfluorocarboxylate anionic surfactant is improved, so that the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tetrafluoroethylene aqueous dispersion liquid, and in particular relates to a preparation device for polytetrafluoroethylene aqueous dispersion liquid. Background Art

[0002] The aqueous dispersion of polytetrafluoroethylene is prepared by emulsion polymerization, which is generally polymerized by water, polymerization initiator, perfluorocarboxylate anionic surfactant (APFC), etc. During the polymerization process, a large amount of reactants need to be added. After the reaction is completed, a certain amount of APFC will still exist. APFC has high value and large dosage. In the existing polytetrafluoroethylene production process, it is difficult to effectively separate and recover APFC. Therefore, it is necessary to design a new preparation device for polytetrafluoroethylene aqueous dispersion that is suitable for quickly and effectively separating APFC. Utility Model Content

[0003] In order to solve the above technical problems, the technical solution adopted by the utility model is: a preparation device for polytetrafluoroethylene aqueous dispersion, including a mixing tank, the mixing tank is covered with a tank cover, and a mixing chamber, an isolation chamber and a clear liquid chamber are sequentially arranged in the mixing tank, the mixing chamber and the isolation chamber are separated by a front isolation plate, and the isolation chamber and the clear liquid chamber are separated by a rear isolation plate, a plurality of front overflow holes are sequentially arranged on the front isolation plate from top to bottom, and a plurality of rear overflow holes are sequentially arranged on the rear isolation plate from top to bottom, and the front overflow holes and the rear overflow holes correspond to each other one by one, and a movable blocking plate is arranged in the isolation chamber, one side of the movable blocking plate is in contact with the front isolation plate, and the movable blocking plate The other side of the movable blocking plate is fitted with the rear isolation plate, a number of springs are arranged under the movable blocking plate, an adjusting screw is arranged on the upper end of the movable blocking plate, a movable port connected to the isolation chamber is arranged on the tank cover, a top plate is arranged above the movable port, the top plate is fixedly connected to the tank cover, a through hole for the adjusting screw to movably pass through is arranged on the top plate, a limiting nut is threadedly connected to the adjusting screw, the limiting nut is located under the top plate, a stirring mechanism is installed in the mixing chamber, a feeding port connected to the mixing chamber is arranged on the tank cover, a discharge port and a liquid discharge port are arranged at the bottom of the mixing tank, the discharge port is connected to the mixing chamber, the liquid discharge port is connected to the clear liquid chamber, and valves are respectively installed at the discharge port and the liquid discharge port.

[0004] As a preferred embodiment of the above technical solution, the stirring mechanism includes a stirring rod, on which stirring blades are provided, and the stirring rod is driven to rotate by a motor.

[0005] As a preferred embodiment of the above technical solution, a column frame is provided on one side of the mixing tank, and the motor is installed on the column frame.

[0006] As a preferred embodiment of the above technical solution, the output shaft of the motor is fixedly connected to a turntable, the stirring rod is detachably connected to the turntable, the turntable and the output shaft of the motor are coaxially arranged, and the turntable and the stirring rod are eccentrically arranged.

[0007] As a preferred embodiment of the above technical solution, the stirring rod is connected to a movable cover plate, the movable cover plate is located above the tank cover, and the movable cover plate is provided with a tight sleeve hole for the stirring rod to pass through.

[0008] As a preferred embodiment of the above technical solution, the lower surface of the turntable is provided with a plug-in groove with a square cross-section, and the upper end of the stirring rod is provided with a plug-in portion with a square cross-section, and the plug-in portion is inserted into the plug-in groove.

[0009] As a preferred embodiment of the above technical solution, the column frame is rotatably mounted on the base, a positioning groove is provided on one side of the base, and one side of the mixing tank is inserted into the positioning groove.

[0010] As a preferred embodiment of the above technical solution, the mixing tank is made of glass, and the front isolation plate and the rear isolation plate are respectively made of glass.

[0011] The beneficial effect of the utility model is that the preparation device of the polytetrafluoroethylene aqueous dispersion of the utility model can effectively separate the unreacted perfluorocarboxylate anionic surfactant during the preparation process of the polytetrafluoroethylene aqueous dispersion, thereby improving the recovery rate of the perfluorocarboxylate anionic surfactant and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] like Figure 1 As shown, a preparation device for polytetrafluoroethylene aqueous dispersion includes a mixing tank 1, which is covered with a tank cover 2. A mixing chamber 3, an isolation chamber 4 and a clear liquid chamber 5 are sequentially arranged in the mixing tank 1. The mixing chamber 3 and the isolation chamber 4 are separated by a front isolation plate 6, and the isolation chamber 4 and the clear liquid chamber 5 are separated by a rear isolation plate 7. A plurality of front overflow holes 8 are sequentially arranged on the front isolation plate 6 from top to bottom, and a plurality of rear overflow holes 9 are sequentially arranged on the rear isolation plate 7 from top to bottom. The front overflow holes 8 and the rear overflow holes 9 correspond to each other one by one. A movable blocking plate 10 is arranged in the isolation chamber 4, and one side of the movable blocking plate 10 is in contact with the front isolation plate 6, and the other side of the movable blocking plate 10 is in contact with the rear isolation plate 7. A movable blocking plate 10 is arranged below the movable blocking plate 10. There are a number of springs 11, an adjusting screw 12 is arranged at the upper end of the movable blocking plate 10, a movable port 13 connected to the isolation chamber 4 is arranged on the tank cover 2, a top plate 14 is arranged above the movable port 13, the top plate 14 is fixedly connected to the tank cover 2, a through hole 16 for the adjusting screw 12 to move through is arranged on the top plate 14, a limiting nut 15 is threadedly connected to the adjusting screw 12, and the limiting nut 15 is located below the top plate 14, a stirring mechanism is installed in the mixing chamber 3, a feeding port 17 connected to the mixing chamber 3 is arranged on the tank cover 2, a discharge port 18 and a liquid discharge port 19 are arranged at the bottom of the mixing tank 1, the discharge port 18 is connected to the mixing chamber 3, the liquid discharge port 19 is connected to the clear liquid chamber 5, and valves are respectively installed at the discharge port 18 and the liquid discharge port 19. Each reactant is fed from the feeding port 17, the reactant undergoes polymerization reaction in the mixing chamber 3, and the product forms a lower layer of polytetrafluoroethylene aqueous dispersion and an upper layer of clarified APFC that does not participate in the reaction after precipitation. By pressing down the adjusting screw 12 and assisting in rotating the limiting nut 15, the height of the movable blocking plate 10 is lowered, so that the upper clear liquid overflows into the clear liquid chamber 5 through the front overflow hole 8 and the rear overflow hole 9 for collection. The finally obtained polytetrafluoroethylene aqueous dispersion is discharged from the discharge port 18 for concentration and other next operations, and the APFC is discharged from the discharge port 19 for reuse.

[0017] Furthermore, the stirring mechanism includes a stirring rod 20 , on which a stirring blade 21 is provided, and the stirring rod 20 is driven to rotate by a motor 23 .

[0018] Furthermore, a column frame 22 is provided on one side of the mixing tank 1 , and a motor 23 is installed on the column frame 22 .

[0019] Furthermore, the output shaft of the motor 23 is fixedly connected with a turntable 24 , and the stirring rod 20 is detachably connected to the turntable 24 . The turntable 24 and the output shaft of the motor 23 are coaxially arranged, and the turntable 24 and the stirring rod 20 are eccentrically arranged.

[0020] Furthermore, the stirring rod 20 is connected with a movable cover plate 25, which is located above the tank cover 2 and is provided with a tight sleeve hole for the stirring rod 20 to pass through. The movable cover plate 25 rotates with the stirring rod 20. The movable cover plate 25 can keep covering the feeding port 17 when the stirring rod 20 rotates. The movable cover plate 25 is made of a thin plastic plate.

[0021] Furthermore, a plug-in groove with a square cross section is provided on the lower surface of the turntable 24 , and a plug-in portion 26 with a square cross section is provided on the upper end of the stirring rod 20 , and the plug-in portion 26 is inserted into the plug-in groove.

[0022] Furthermore, the column frame 22 is rotatably mounted on the base 27, and a positioning groove is provided on one side of the base 27, and one side of the mixing tank 1 is inserted into the positioning groove. When reactants need to be added, the stirring rod 20 is disassembled, the column frame 22 is rotated, and the motor 23 is moved away from the feeding port 17 to facilitate the addition of reactants.

[0023] Furthermore, the mixing tank 1 is made of glass, and the front isolation plate 6 and the rear isolation plate 7 are respectively made of glass. The movable blocking plate 10 is also made of glass.

[0024] It is worth mentioning that the technical features such as motors involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field, and should not be regarded as the utility model points of this utility model patent. This utility model patent will not be further elaborated.

[0025] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field through logical analysis, reasoning or limited experiments based on the concept of the utility model on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A device for preparing polytetrafluoroethylene aqueous dispersion, characterized in that: The invention comprises a mixing tank, which is covered with a tank cover, wherein a mixing chamber, an isolation chamber and a clear liquid chamber are sequentially arranged in the mixing tank, wherein the mixing chamber and the isolation chamber are separated by a front isolation plate, and the isolation chamber and the clear liquid chamber are separated by a rear isolation plate, wherein a plurality of front overflow holes are sequentially arranged on the front isolation plate from top to bottom, and a plurality of rear overflow holes are sequentially arranged on the rear isolation plate from top to bottom, and the front overflow holes and the rear overflow holes correspond to each other one by one, and a movable blocking plate is arranged in the isolation chamber, wherein one side of the movable blocking plate is in contact with the front isolation plate, and the other side of the movable blocking plate is in contact with the rear isolation plate, and the bottom of the movable blocking plate is A plurality of springs are provided, an adjusting screw is provided at the upper end of the movable blocking plate, a movable opening connected to the isolation chamber is provided on the tank cover, a top plate is provided above the movable opening, the top plate is fixedly connected to the tank cover, a through hole for the adjusting screw to movably pass through is provided on the top plate, a limiting nut is threadedly connected to the adjusting screw, the limiting nut is located below the top plate, a stirring mechanism is installed in the mixing chamber, a feeding port connected to the mixing chamber is provided on the tank cover, a discharge port and a liquid discharge port are provided at the bottom of the mixing tank, the discharge port is connected to the mixing chamber, the liquid discharge port is connected to the clear liquid chamber, and valves are respectively installed at the discharge port and the liquid discharge port.

2. The device for preparing the polytetrafluoroethylene aqueous dispersion according to claim 1, characterized in that: The stirring mechanism comprises a stirring rod, on which stirring blades are arranged, and the stirring rod is driven to rotate by a motor.

3. The device for preparing the polytetrafluoroethylene aqueous dispersion according to claim 2, characterized in that: A column frame is arranged on one side of the mixing tank, and the motor is mounted on the column frame.

4. The device for preparing the polytetrafluoroethylene aqueous dispersion according to claim 3, characterized in that: The output shaft of the motor is fixedly connected with a turntable, the stirring rod is detachably connected to the turntable, the turntable and the output shaft of the motor are coaxially arranged, and the turntable and the stirring rod are eccentrically arranged.

5. The device for preparing the polytetrafluoroethylene aqueous dispersion according to claim 4, characterized in that: The stirring rod is connected with a movable cover plate, which is located above the tank cover and is provided with a tight sleeve hole for the stirring rod to pass through.

6. The device for preparing the polytetrafluoroethylene aqueous dispersion according to claim 5, characterized in that: The lower surface of the turntable is provided with a plug-in groove with a square cross section, and the upper end of the stirring rod is provided with a plug-in portion with a square cross section, and the plug-in portion is inserted into the plug-in groove.

7. The device for preparing the polytetrafluoroethylene aqueous dispersion according to claim 6, characterized in that: The column frame is rotatably mounted on the base, one side of the base is provided with a positioning groove, and one side of the mixing tank is inserted into the positioning groove.

8. The device for preparing polytetrafluoroethylene aqueous dispersion according to claim 1, characterized in that: The mixing tank is made of glass, and the front isolation plate and the rear isolation plate are respectively made of glass.

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