Emulsifying device for preparing high-density oxidized polyethylene wax emulsion

Abstract

The utility model discloses an emulsifying device for preparing high-density oxidized polyethylene wax emulsion. The emulsifying device comprises an emulsifying kettle cover and an emulsifying kettle body, wherein the emulsifying kettle cover is provided with an exhaust port, a bottom feeding port and a discharging port; two rotating shafts are mounted in the emulsifying kettle body, a plurality of groups of stirring blades are mounted on the peripheral surfaces of the rotating shafts, a feeding box is fixedly mounted on the emulsifying kettle cover, and a feeding hole I and a feeding hole II for adding molten oxidized polyethylene wax and an emulsifying agent are formed in the feeding box; a feeding pipe communicated with the feeding opening I and the feeding opening II is mounted at the bottom of the feeding box; a gas distribution box is fixedly arranged on a kettle cover of the emulsifying kettle, an argon filling port and a carbon dioxide filling port are formed in the gas distribution box, double rotating shafts are adopted in a kettle body of the emulsifying kettle, and stirring blades are arranged on the rotating shafts in a staggered manner, so that a multi-layer and high-shear stirring state is formed during stirring; the oil-phase molten oxidized polyethylene wax and the water-phase emulsifier are fully mixed, so that the particle size of the emulsion is smaller, and the emulsification efficiency is improved by more than 20%.

Description

Technical Field

[0001] This utility model relates to the field of oxidized polyethylene wax preparation technology, specifically to an emulsification device for preparing high-density oxidized polyethylene wax emulsion. Background Technology

[0002] In the production process of high-density oxidized polyethylene wax emulsion, the performance of the emulsification unit directly affects the product's stability, particle size distribution, and antioxidant properties.

[0003] Traditional emulsification equipment typically uses a single-shaft stirring structure, which has problems such as uneven mixing and insufficient shear force, resulting in large wax emulsion particles, uneven distribution, and easy stratification or sedimentation.

[0004] In addition, oxidized polyethylene wax is extremely easy to oxidize in the high-temperature molten state, while the inert gas protection system of conventional emulsification tanks is often simply designed, with only a single gas such as nitrogen introduced from the bottom, which is prone to generating bubbles or incomplete protection, affecting the quality of the emulsion.

[0005] Therefore, we have carried out technical modifications to the existing equipment to solve problems such as uneven mixing and emulsification, and easy oxidation during emulsification. Utility Model Content

[0006] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing an emulsifying device for preparing high-density oxidized polyethylene wax emulsion, which has good stirring effect and can protect the material before and during stirring to avoid affecting the product quality.

[0007] The technical problem to be solved by this utility model is achieved through the following technical solution: an emulsification device for preparing high-density oxidized polyethylene wax emulsion, which includes an emulsification kettle cover and an emulsification kettle body. An exhaust port is installed on the emulsification kettle cover, and a bottom feeding port and a discharge port are installed at the bottom of the emulsification kettle body.

[0008] Two rotating shafts are installed inside the emulsification kettle. Several sets of stirring blades are installed on the outer circumference of the rotating shafts. The top of the rotating shafts extends to the top of the emulsification kettle lid. A rotating power mechanism that drives the two rotating shafts to rotate is installed on the top of the emulsification kettle lid.

[0009] A feeding box is fixedly installed on the lid of the emulsification kettle. The feeding box has feeding port I and feeding port II for adding molten oxidized polyethylene wax and emulsifier. A feed pipe connected to feeding port I and feeding port II is installed at the bottom of the feeding box. The outlet end of the feed pipe extends to the top area of ​​the emulsification kettle body.

[0010] A gas distribution box is fixedly installed on the lid of the emulsification kettle. The gas distribution box has an argon gas inlet and a carbon dioxide gas inlet. An inlet pipe connected to the argon gas inlet and the carbon dioxide gas inlet is installed at the bottom of the gas distribution box. The outlet end of the inlet pipe extends to the top area of ​​the emulsification kettle body.

[0011] Heat exchange tubes are installed on the outer circumferential surface of the emulsification vessel.

[0012] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above has several sets of stirring blades on two rotating shafts staggered one above the other.

[0013] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above, each set of stirring blades includes two stirring plates symmetrically arranged one above the other, and several flow holes are opened on each stirring plate.

[0014] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above has a power mechanism mounting box screwed onto the top outer wall of the emulsification kettle lid. The rotary power mechanism is installed on the top inner wall of the power mechanism mounting box, and a gear is fixed on the outer circumferential surface of the rotating shaft extending into the power mechanism mounting box. The power output end of the rotary power mechanism is driven by the gear through toothed belt meshing.

[0015] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above has an installation plate screwed onto the inner top wall of the emulsification kettle lid, and two rotary bearings are installed at the bottom end of the installation plate, with the top outer circumferential surface of the rotary shaft placed inside the rotary bearings.

[0016] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above, wherein the feeding box and the gas distribution box are both box structures with internal cavity structures.

[0017] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsifying device for preparing high-density oxidized polyethylene wax emulsion described above also includes a valve assembly, which includes;

[0018] A gas check valve assembly, comprising gas check valves built into the argon gas inlet and the carbon dioxide gas inlet;

[0019] A fluid check valve assembly, comprising a fluid check valve built into feed port I and feed port II;

[0020] An exhaust check valve is installed inside the exhaust port;

[0021] A one-way valve for feeding is installed inside the bottom feeding port;

[0022] A discharge check valve is installed inside the discharge port.

[0023] The technical problem to be solved by this utility model can also be achieved through the following technical solution: In the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above, the height of the exhaust port is higher than the height of the outlet end of the air inlet pipe.

[0024] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the emulsification device for preparing high-density oxidized polyethylene wax emulsion described above has several static flow baffles fixedly installed on the inner wall of the emulsification kettle.

[0025] Compared with the prior art, the beneficial technical effects of this utility model are:

[0026] (1) The emulsification vessel is equipped with a double rotating shaft, and the stirring blades are staggered on the rotating shaft. This creates a multi-layered, high-shear stirring state during stirring, ensuring that the oil phase melts and oxidizes the polyethylene wax and the water phase emulsifier are fully mixed, making the emulsion particles smaller and more evenly distributed. In addition, the flow holes opened on the stirring blades can further enhance local turbulence, avoid dead zones, and improve emulsification efficiency by more than 20%.

[0027] (2) Argon gas can be introduced into the emulsification vessel through the gas distribution box to improve the antioxidant environment in the early stage of emulsification. Carbon dioxide can also be introduced to suppress foam and slightly thicken the emulsion. It is highly practical. The design of the exhaust port being higher than the inlet pipe ensures that the exhaust gas is discharged first, and the gas protection efficiency is improved by 40%.

[0028] (3) The gas check valve and fluid check valve installed in the valve assembly avoid the risk of material backflow or gas leakage, and ensure the normal operation of emulsification. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0030] Figure 2 This is a top view of the rotary power mechanism and two rotating shafts of this utility model.

[0031] In the diagram: 1. Emulsifying kettle lid; 2. Emulsifying kettle body; 3. Exhaust port; 4. Bottom feed port; 5. Discharge port; 6. Rotating shaft; 7. Mounting plate; 8. Rotary bearing; 9. Stirring plate; 10. Flow hole; 11. Rotary power mechanism; 12. Power mechanism mounting box; 13. Toothed belt; 14. Baffle plate; 15. Feed box; 16. Gas distribution box; 17. Feed port I; 18. Feed port II; 19. Feed pipe; 20. Argon gas inlet; 21. Carbon dioxide gas inlet; 22. Gas inlet pipe; 23. Heat exchanger tube. Detailed Implementation

[0032] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0033] Example 1, referring to Figure 1-2 An emulsification device for preparing high-density oxidized polyethylene wax emulsion includes an emulsification kettle cover 1 and an emulsification kettle body 2. An exhaust port 3 is installed on the emulsification kettle cover 1, and a bottom feeding port 4 and a discharge port 5 are installed at the bottom of the emulsification kettle body 2. Bottom feeding can also be performed into the bottom feeding port 4 according to process requirements.

[0034] Two rotating shafts 6 are installed inside the emulsifying vessel body 2. The rotating shafts 6 are vertically arranged. An mounting plate 7 is screwed onto the top inner wall of the emulsifying vessel cover 1. The mounting plate 7 is formed into a roughly square plate structure. Two rotating bearings 8 are installed at the bottom end of the mounting plate 7. The top outer circumference of the rotating shafts 6 is placed inside the rotating bearings 8. Several sets of stirring blades are installed on the outer circumference of the rotating shafts 6. The sets of stirring blades on the two rotating shafts 6 are staggered, one set of blades being about 10 cm above the other set of blades, thus forming a staggered multi-directional stirring state. Each set of stirring blades includes two stirring plates 9 symmetrically arranged one above the other. The stirring plates 9 are formed into a roughly plate structure. Several flow holes 10 are opened on each stirring plate 9. The purpose of the flow orifice 10 is to improve the emulsification effect by increasing the complexity of the fluid flow through the fluid. The top of the rotating shaft 6 extends to the top of the emulsification kettle cover 1. A rotating power mechanism 11 that drives the two rotating shafts 6 to rotate is installed on the top of the emulsification kettle cover 1. The rotating power mechanism 11 can be a rotary motor, and its model can be selected according to the usage requirements. A power mechanism mounting box 12 is screwed to the top outer wall of the emulsification kettle cover 1. The power mechanism mounting box 12 is formed into a roughly square box-shaped structure. The rotating power mechanism 11 is installed on the top inner wall of the power mechanism mounting box 12. A gear is fixed on the outer circumferential surface of the rotating shaft 6 that extends into the power mechanism mounting box 12. The power output end of the rotating power mechanism 11 is meshed with the gear through the toothed belt 13.

[0035] In order to improve the emulsification effect, several static flow-blocking plates 14 are fixed on the inner wall of the emulsification vessel body 2. The static flow-blocking plates 14 are formed into a roughly square plate structure.

[0036] A feeding box 15 is fixedly installed on the emulsification kettle lid 1. The feeding box 15 and the gas distribution box 16 described below are both box structures with internal cavities. The feeding box 15 has a feeding port I 17 and a feeding port II 18 for adding molten oxidized polyethylene wax and emulsifier. The bottom of the feeding box 15 is equipped with a feed pipe 19 that is connected to the feeding port I 17 and the feeding port II 18. The feed pipe 19 is a vertical pipe structure, and the outlet end of the feed pipe 19 extends to the top area of ​​the emulsification kettle body 2.

[0037] A gas distribution box 16 is fixedly installed on the emulsification kettle lid 1. The gas distribution box 16 has an argon gas inlet 20 and a carbon dioxide gas inlet 21. An inlet pipe 22 connected to the argon gas inlet 20 and the carbon dioxide gas inlet 21 is installed at the bottom of the gas distribution box 16. The outlet end of the inlet pipe 22 extends to the top area of ​​the emulsification kettle body 2. The height of the exhaust port 3 is higher than the height of the outlet end of the inlet pipe 22 to ensure that the waste gas is preferentially discharged by the inert protective gas.

[0038] To improve the emulsification effect, we installed heat exchange tubes 23 on the outer circumferential surface of the emulsification vessel body 2. During emulsification, heat can be exchanged between the external hot fluid and the internal medium of the emulsification vessel body 2 to heat it.

[0039] It also includes valve assemblies, which include;

[0040] A gas check valve assembly (not shown) includes gas check valves built into the argon gas inlet 20 and the carbon dioxide gas inlet 21;

[0041] A fluid check valve assembly (not shown) includes fluid check valves built into feed port I 17 and feed port II 18;

[0042] An exhaust check valve (not shown in the figure) is installed inside the exhaust port 3;

[0043] A one-way valve for feeding (not shown in the figure) is installed inside the bottom feeding port 4;

[0044] A discharge check valve (not shown in the figure) is installed inside the discharge port 5.

[0045] The emulsification device for preparing high-density oxidized polyethylene wax emulsion in Example 1 is processed and used as follows:

[0046] First, molten oxidized polyethylene wax and emulsifier aqueous solution are added through the feeding ports I17 and II18 of the feeding box 15, respectively. During the feeding process, the fluid one-way valve group ensures that the material can only flow into the emulsification kettle in one direction to prevent backflow. At the same time, high-density argon is introduced from the argon gas inlet 20 of the gas distribution box 16. The argon enters the kettle from the top through the gas inlet pipe 22. Since the density of argon is greater than that of air, it will naturally sink to form a protective layer. This allows other gases in the emulsification kettle body 2 to be discharged through the higher exhaust port 3, so that the oxygen residue is reduced to below 0.5%.

[0047] After the material is added, the rotary power mechanism 11 is started to drive the two rotating shafts 6 to rotate synchronously. The staggered stirring blades on the two shafts form a multi-directional shear flow field. This three-dimensional staggered layout allows the material to be fully sheared in both the axial and radial directions. The flow holes 10 on the stirring plate 9 further increase the turbulence of the fluid, causing the wax phase to be broken into tiny droplets with a particle size of less than 1μm. At the same time, the stationary flow baffle 14 fixed on the inner wall of the emulsification vessel 2 interacts with the moving blades to generate a local high shear zone. The emulsification efficiency is increased by more than 30% compared with the traditional single-shaft stirring.

[0048] In the later stage of emulsification, carbon dioxide can be introduced into the emulsification vessel 2 through the gas distribution box 16. The foam-suppressing properties of carbon dioxide reduce the foam content in the fluid. At the same time, its slight thickening properties after dissolution can also improve the stability of the emulsion. The heat transfer oil circulating in the heat exchange tube 23 can precisely control the temperature inside the vessel, so that the system is always kept in the optimal emulsification temperature range, such as 85-95℃. This dynamic gas switching and temperature coordinated control method reduces the product stability CV value (flow coefficient) to below 10%.

[0049] After emulsification is completed, the rotary power mechanism 11 is turned off, and the emulsion is discharged through the bottom outlet 5. Throughout the process, all one-way valve groups ensure the one-way flow of materials and gases, completely eliminating the risk of cross-contamination. The resulting high-density oxidized polyethylene wax emulsion has the characteristics of narrow particle size distribution and good antioxidant properties. Each component is easy to disassemble and assemble, and it is suitable for processing materials of different viscosities.

Claims

1. An emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion, characterized in that: It includes an emulsifying kettle lid and an emulsifying kettle body. An exhaust port is installed on the emulsifying kettle lid, and a bottom feed port and a discharge port are installed at the bottom of the emulsifying kettle body. Two rotating shafts are installed inside the emulsification kettle. Several sets of stirring blades are installed on the outer circumference of the rotating shafts. The top of the rotating shafts extends to the top of the emulsification kettle lid. A rotating power mechanism that drives the two rotating shafts to rotate is installed on the top of the emulsification kettle lid. A feeding box is fixedly installed on the lid of the emulsification kettle. The feeding box has feeding port I and feeding port II for adding molten oxidized polyethylene wax and emulsifier. A feed pipe connected to feeding port I and feeding port II is installed at the bottom of the feeding box. The outlet end of the feed pipe extends to the top area of ​​the emulsification kettle body. A gas distribution box is fixedly installed on the lid of the emulsification kettle. The gas distribution box has an argon gas inlet and a carbon dioxide gas inlet. An inlet pipe connected to the argon gas inlet and the carbon dioxide gas inlet is installed at the bottom of the gas distribution box. The outlet end of the inlet pipe extends to the top area of ​​the emulsification kettle body. Heat exchange tubes are installed on the outer circumferential surface of the emulsification vessel.

2. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: Several sets of stirring blades on the two rotating shafts are staggered, one above the other.

3. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: Each set of stirring blades includes two stirring plates arranged symmetrically one above the other, and each stirring plate has several flow holes.

4. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: A power mechanism mounting box is screwed onto the top outer wall of the emulsification kettle lid. The rotary power mechanism is mounted on the top inner wall of the power mechanism mounting box. A gear is fixed on the outer circumferential surface of the rotary shaft extending into the power mechanism mounting box. The power output end of the rotary power mechanism is driven by the gear through a toothed belt.

5. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: An installation plate is screwed onto the inner top wall of the emulsification kettle lid. Two rotary bearings are installed at the bottom end of the installation plate, and the outer top surface of the rotary shaft is placed inside the rotary bearings.

6. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: Both the feeding box and the gas distribution box are box structures with internal cavities.

7. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: It also includes a valve assembly, which includes; A gas check valve assembly, comprising gas check valves built into the argon gas inlet and the carbon dioxide gas inlet; A fluid check valve assembly, comprising a fluid check valve built into feed port I and feed port II; An exhaust check valve is installed inside the exhaust port; A one-way valve for feeding is installed inside the bottom feeding port; A discharge check valve is installed inside the discharge port.

8. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: The height of the exhaust port is higher than the height of the outlet end of the intake pipe.

9. The emulsifying apparatus for preparing high-density oxidized polyethylene wax emulsion according to claim 1, characterized in that: Several static flow baffles are fixedly installed on the inner wall of the emulsification kettle.

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