PVDF copolymerization modification device
By installing a guide pipe and a manifold inside the demulsifier for water-cooled stirring and cooling, and installing a purification mechanism on the top of the demulsifier to adsorb gas, the problems of slow cooling and gas pollution in traditional demulsifiers are solved, achieving efficient production and a safe environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA YONGHE FLUOROCHEMICAL CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional demulsifiers require the emulsion to cool to room temperature before demulsification can be performed, which takes a long time and lacks gas purification capabilities, resulting in low production efficiency and the presence of irritating gas pollution.
A PVDF copolymerization modification device is designed, which uses a guide pipe and a manifold inside the demulsifier, combined with water cooling and stirring to reduce temperature, and a purification mechanism installed on the top of the demulsifier to adsorb irritating gases using modified activated carbon plates.
It achieves rapid cooling of the emulsion, shortens the waiting time, improves production efficiency, and effectively adsorbs irritating gases through the purification mechanism, ensuring production safety and environmental hygiene.
Smart Images
Figure CN224524754U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a PVDF copolymerization modification device, belonging to the technical field of copolymerization modification equipment. Background Technology
[0002] PVDF (polyvinylidene fluoride), as a high-performance fluoropolymer, has excellent chemical corrosion resistance, high temperature resistance, weather resistance, and unique dielectric and piezoelectric properties. However, it also has disadvantages such as high melt viscosity, poor processability, and insufficient toughness. Copolymerization modification can effectively improve these properties and expand its application range. Taking the industrially common PVDF-HFP (vinylidene fluoride-hexafluoropropylene) copolymerization as an example, after the polymerization reaction stage, the emulsion needs to be cooled to room temperature. Then, the emulsion is demulsified by adding electrolytes (such as sodium chloride) or adjusting the pH value (such as adding sulfuric acid). During this process, a demulsification tank with stirring is required.
[0003] However, traditional demulsifiers can only demulsify after the emulsion has cooled to room temperature, which requires a long waiting time, has low functionality, and reduces production efficiency. In addition, the equipment does not have gas purification function during use, and the emulsion may contain residual monomers such as vinylidene fluoride (VDF), hexafluoropropylene (HFP) or trifluorochloroethylene (CTFE). When volatilized, they will produce a slight to moderate irritating odor that can irritate the respiratory tract.
[0004] To address these issues, a PVDF copolymerization modification device was designed. Utility Model Content
[0005] The main objective of this invention is to provide a PVDF copolymerization modification device to solve the problems mentioned in the background art.
[0006] The objective of this utility model can be achieved by adopting the following technical solution:
[0007] A PVDF copolymerization modification device includes a demulsifier, a mounting plate horizontally fixed to the top of the demulsifier, a stirring motor vertically mounted on the top of the mounting plate, a stirring shaft mounted on the output end of the stirring motor, and stirring blades vertically mounted on the outside of the stirring shaft.
[0008] The inner wall of the demulsifier is coiled with a guide pipe. A lower confluence chamber is located in the middle of the bottom of the demulsifier, and an upper confluence chamber is located in the middle of the mounting plate. The stirring shaft passes through the interior of the upper confluence chamber and extends into the interior of the lower confluence chamber. The stirring shaft is rotatably connected to the lower and upper confluence chambers. The two ends of the guide pipe are respectively connected to the lower and upper confluence chambers. The interior of the stirring shaft and stirring blades has through grooves that communicate with the lower and upper confluence chambers. A water inlet pipe is located at the bottom of the lower confluence chamber, and a drain pipe is located on the side of the upper confluence chamber.
[0009] A purification mechanism is located on one side of the top of the demulsifier.
[0010] Preferably, the purification mechanism includes a purification box, a modified activated carbon plate, and an air pump. The purification box is fixed to one side of the top of the demulsifying tank. The purification box is equipped with a modified activated carbon plate inside. An air pump is installed on the side of the demulsifying tank. The input end of the air pump is connected to the inside of the purification box through a pipe.
[0011] Preferred configuration: A primary filter layer is provided near the air inlet inside the purification chamber, and the primary filter layer is a glass fiber filter. The number of modified activated carbon plates is one, and they are arranged in parallel with intervals, with a spacing of 5-10cm between adjacent modified activated carbon plates.
[0012] Preferably, the through groove inside the stirring blade is U-shaped, and the through groove inside the stirring shaft is opened along the length direction, with the stirring shaft and the through groove inside the stirring blade communicating with each other.
[0013] Preferably, the guide tube is spirally coiled around the inner wall of the demulsifier, and the guide tube is made of stainless steel.
[0014] Preferably, the inner wall of the demulsifier is coated with a polytetrafluoroethylene anti-corrosion coating with a thickness of 0.1-0.3 mm.
[0015] Preferably, mechanical seals are provided at the rotating connections between the stirring shaft and the upper and lower manifolds, and the mechanical seals are made of fluororubber.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. This utility model features a guide pipe coiled around the inner wall of the demulsifier, with an upper and lower confluence chamber at each end. The two ends of the guide pipe are connected to the upper and lower confluence chambers, respectively. Simultaneously, the stirring shaft and stirring blades are provided with channels connecting to the upper and lower confluence chambers. This allows the raw materials after polymerization to be directly discharged into the demulsifier, where water-cooled stirring is used for cooling. This improves the cooling rate and the functionality of the demulsifier. Furthermore, it cools the material during the demulsification process, preventing excessive temperature from causing thermal decomposition, reemulsification, and the release of toxic gases, thus enhancing its practicality.
[0018] 2. This utility model has a purification mechanism consisting of a purification box, a modified activated carbon plate, and an air pump installed on one side of the top of the demulsifying tank. This mechanism can absorb the irritating gases generated inside the demulsifying tank during the demulsification process and adsorb them using the modified activated carbon plate, thereby purifying the environment and ensuring production safety and personnel health. Attached Figure Description
[0019] Figure 1 This is a front sectional view of the present invention;
[0020] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;
[0021] Figure 3 This is a structural diagram of the stirring shaft of this utility model;
[0022] Figure 4 This is the front view of the present invention.
[0023] In the diagram: 1. Demulsifier; 101. Mounting plate; 102. Stirring motor; 103. Stirring shaft; 104. Stirring blades;
[0024] 2. Guide pipe; 3. Lower manifold; 4. Upper manifold; 5. Through channel; 6. Inlet pipe;
[0025] 7. Drainage pipe;
[0026] 8. Purification mechanism; 801. Purification box; 802. Modified activated carbon plate; 803. Suction pump. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments 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. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.
[0028] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0029] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] Example 1
[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes a PVDF copolymerization modification device, including a demulsifier 1, a mounting plate 101 horizontally fixed to the top of the demulsifier 1, a stirring motor 102 vertically mounted on the top of the mounting plate 101, a stirring shaft 103 mounted on the output end of the stirring motor 102, and stirring blades 104 vertically mounted on the outside of the stirring shaft 103.
[0034] The inner wall of the demulsifying tank 1 is coiled with a guide pipe 2. The bottom of the demulsifying tank 1 is provided with a lower confluence chamber 3 at the middle position. The mounting plate 101 is provided with an upper confluence chamber 4 at the middle position. The stirring shaft 103 passes through the interior of the upper confluence chamber 4 and extends to the interior of the lower confluence chamber 3. The stirring shaft 103 is rotatably connected to the lower confluence chamber 3 and the upper confluence chamber 4. The two ends of the guide pipe 2 are respectively connected to the lower confluence chamber 3 and the upper confluence chamber 4. The interior of the stirring shaft 103 and the stirring blade 104 is provided with a through groove 5 that is connected to the lower confluence chamber 3 and the upper confluence chamber 4. The bottom of the lower confluence chamber 3 is provided with a water inlet pipe 6. The side of the upper confluence chamber 4 is provided with a drain pipe 7.
[0035] A purification mechanism 8 is provided on one side of the top of the demulsifier 1.
[0036] The high-temperature emulsion after polymerization is directly fed into the demulsifier 1 without waiting for natural cooling. At this time, cooling water is introduced into the lower manifold 3 through the inlet pipe 6. The cooling water is divided into two streams for efficient cooling. One stream of cooling water enters the guide pipe 2 coiled on the inner wall of the demulsifier 1, flows along the spiral guide pipe and exchanges heat with the emulsion in the tank. After absorbing heat, it flows into the upper manifold 4 and is finally discharged from the drain pipe 7. The other stream of cooling water enters the through-groove 5 opened along the length of the stirring shaft 103 through the lower manifold 3, and then flows into the U-shaped through-groove 5 in the stirring blade 104. After directly contacting the emulsion and exchanging heat, it also flows into the through-groove 5. The emulsion enters the upper confluence chamber 4 and is discharged from the drain pipe 7. At the same time, the stirring motor 102 drives the stirring shaft 103 and stirring blades 104 to rotate, so that the emulsion is uniformly heated during the stirring process, realizing the dual cooling of "cooling the outer wall of the tank + cooling the inside of the stirring components", which greatly shortens the cooling time. Once the emulsion has cooled to room temperature, electrolytes (such as sodium chloride) or pH adjustment (such as adding sulfuric acid) can be added directly to demulsify, improving production efficiency. In addition, the purification mechanism 8 at the top of the demulsification tank 1 is started simultaneously to initially adsorb the irritating gases (such as VDF, HFP, etc.) volatilized during the demulsification process, reducing gas diffusion.
[0037] Example 2
[0038] The solution in Example 1 will be further described below with reference to its specific working method.
[0039] like Figure 1 As shown, in a preferred embodiment, based on the above method, the purification mechanism 8 further includes a purification box 801, a modified activated carbon plate 802, and an air pump 803. The purification box 801 is fixed to one side of the top of the demulsifying tank 1. The modified activated carbon plate 802 is provided inside the purification box 801. The air pump 803 is installed on the side of the demulsifying tank 1. The input end of the air pump 803 is connected to the inside of the purification box 801 through a pipe.
[0040] During the demulsification process, the suction pump 803 continuously draws gas from the demulsification tank 1. The gas first enters the purification chamber 801, where it is filtered by a glass fiber filter (primary filter layer) at the air inlet to remove particulate impurities such as dust and droplets. Then, it flows through 2-4 parallel modified activated carbon plates 802 spaced 5-10cm apart. By increasing the contact area and extending the residence time, the plates efficiently adsorb residual monomers (such as VDF and HFP) and irritating components in the gas. The purified gas is then discharged by the suction pump 803, ensuring a safe working environment.
[0041] like Figure 1As shown, in a preferred embodiment, based on the above method, a primary filter layer is provided in the purification box 801 near the air inlet, and the primary filter layer is a glass fiber filter. The number of modified activated carbon plates 802 is 2-4, and they are arranged in parallel with intervals. The distance between two adjacent modified activated carbon plates 802 is 5-10cm.
[0042] like Figure 1 As shown, in a preferred embodiment, based on the above method, the through groove 5 inside the stirring blade 104 is U-shaped, and the through groove 5 inside the stirring shaft 103 is opened along the length direction, so that the stirring shaft 103 and the through groove 5 inside the stirring blade 104 are in communication.
[0043] The U-shaped groove 5 inside the stirring blade 104 allows the cooling water to circulate within the blade, resulting in more thorough contact with the emulsion and a more uniform temperature distribution, thus avoiding thermal decomposition or reemulsification problems caused by local overheating.
[0044] like Figure 1 As shown, in a preferred embodiment, based on the above method, the guide tube 2 is further spirally coiled around the inner wall of the demulsifier 1, and the material of the guide tube 2 is 316 stainless steel. The spiral guide tube 2 is made of 316 stainless steel, which is resistant to corrosion by emulsion and cooling water, and ensures long-term heat exchange stability.
[0045] like Figure 1 As shown, in a preferred embodiment, based on the above method, the inner wall of the demulsifying tank 1 is further coated with a polytetrafluoroethylene anti-corrosion coating with a thickness of 0.1-0.3 mm. The polytetrafluoroethylene anti-corrosion coating isolates the tank wall from corrosive components (such as sulfuric acid) in the emulsion.
[0046] like Figure 1 As shown, in a preferred embodiment, based on the above method, mechanical seals are further provided at the rotational connection points between the stirring shaft 103 and the upper and lower manifolds 4 and 3, and the mechanical seals are made of fluororubber. The fluororubber mechanical seals ensure that there is no leakage of cooling water when it flows under high pressure, maintain the sealing and stability of the cooling system, and extend the service life of the equipment.
[0047] Example 3
[0048] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.
[0049] The high-temperature emulsion after polymerization is directly fed into the demulsifier 1 without waiting for natural cooling. At this time, cooling water is introduced into the lower manifold 3 through the inlet pipe 6. The cooling water is divided into two streams for efficient cooling. One stream of cooling water enters the guide pipe 2 coiled on the inner wall of the demulsifier 1, flows along the spiral guide pipe and exchanges heat with the emulsion in the tank. After absorbing heat, it flows into the upper manifold 4 and is finally discharged from the drain pipe 7. The other stream of cooling water enters the through-groove 5 along the length of the stirring shaft 103 through the lower manifold 3, and then flows into the U-shaped through-groove 5 in the stirring blade 104. The U-shaped through-groove 5 in the stirring blade 104 causes the cooling water to form a circulation within the blade. After directly contacting the emulsion for heat exchange, it also flows into the upper manifold 4 and is discharged from the drain pipe 7. At the same time, the stirring motor 102 drives the stirring shaft 103 and the stirring blade 104 to rotate. This process ensures uniform heat exchange during emulsion mixing, achieving dual cooling through "external cooling of the tank wall + internal cooling of the mixing components." This significantly shortens the cooling time, allowing electrolytes (such as sodium chloride) or pH adjustments (such as adding sulfuric acid) to be added directly once the emulsion reaches room temperature, thus improving production efficiency. In addition, the suction pump 803 continuously draws gas from the demulsification tank 1. The gas first enters the purification chamber 801, where it is filtered by a glass fiber filter (primary filter layer) at the air inlet to remove particulate impurities such as dust and droplets. It then flows through 2-4 parallel modified activated carbon plates 802 spaced 5-10cm apart. By increasing the contact area and extending the residence time, residual monomers (such as VDF and HFP) and irritating components in the gas are efficiently adsorbed. The purified gas is then discharged by the suction pump 803, ensuring a safe working environment.
[0050] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.
Claims
1. A PVDF copolymerization modification device, comprising a demulsifier (1), a mounting plate (101) horizontally fixed to the top of the demulsifier (1), a stirring motor (102) vertically mounted on the top of the mounting plate (101), a stirring shaft (103) mounted on the output end of the stirring motor (102), and stirring blades (104) vertically mounted on the outside of the stirring shaft (103); Its features are: The inner wall of the demulsifier (1) is wrapped with a guide pipe (2). The bottom of the demulsifier (1) is provided with a lower confluence chamber (3) in the middle position. The middle position of the mounting plate (101) is provided with an upper confluence chamber (4). The stirring shaft (103) passes through the interior of the upper confluence chamber (4) and extends to the interior of the lower confluence chamber (3). The stirring shaft (103) is rotatably connected to the lower confluence chamber (3) and the upper confluence chamber (4). The two ends of the guide pipe (2) are respectively connected to the lower confluence chamber (3) and the upper confluence chamber (4). The interior of the stirring shaft (103) and the stirring blade (104) is provided with a through groove (5) that is connected to the lower confluence chamber (3) and the upper confluence chamber (4). The bottom of the lower confluence chamber (3) is provided with a water inlet pipe (6). The side of the upper confluence chamber (4) is provided with a drain pipe (7). A purification mechanism (8) is provided on one side of the top of the demulsifier (1).
2. The PVDF copolymerization modification equipment according to claim 1, characterized in that: The purification mechanism (8) includes a purification box (801), a modified activated carbon plate (802), and an air pump (803). The purification box (801) is fixed on one side of the top of the demulsifying tank (1). The modified activated carbon plate (802) is installed inside the purification box (801). The air pump (803) is installed on the side of the demulsifying tank (1). The input end of the air pump (803) is connected to the inside of the purification box (801) through a pipe.
3. The PVDF copolymerization modification equipment according to claim 2, characterized in that: The purification box (801) is equipped with a primary filter layer near the air inlet, and the primary filter layer is a glass fiber filter. There are 2-4 modified activated carbon plates (802) arranged in parallel with intervals, and the distance between two adjacent modified activated carbon plates (802) is 5-10cm.
4. The PVDF copolymerization modification equipment according to claim 1, characterized in that: The through groove (5) inside the stirring blade (104) is U-shaped, and the through groove (5) inside the stirring shaft (103) is opened along the length direction. The stirring shaft (103) and the through groove (5) inside the stirring blade (104) are connected.
5. The PVDF copolymerization modification equipment according to claim 1, characterized in that: The guide tube (2) is spirally coiled around the inner wall of the demulsifier (1), and the guide tube (2) is made of 316 stainless steel.
6. The PVDF copolymerization modification equipment according to claim 1, characterized in that: The inner wall of the demulsifier (1) is coated with a polytetrafluoroethylene anti-corrosion coating with a thickness of 0.1-0.3 mm.
7. The PVDF copolymerization modification equipment according to claim 1, characterized in that: Mechanical seals are provided at the rotational connection points between the stirring shaft (103) and the upper confluence chamber (4) and the lower confluence chamber (3), and the mechanical seals are made of fluororubber.