CN218608091U - Polymer devolatilization device - Google Patents

Abstract

The utility model relates to a polymer processing technology field discloses a polymer devolatilization device, including first motor, the second motor, the feed liquor pipe, and by outer to interior shell of establishing of coaxial cover in proper order, the inner tube, the rotor, the internal perisporium of inner tube and the interior roof of shell are injectd and are formed the devolatilization cavity, the devolatilization cavity communicates to the outside of shell through second discharge gate and first discharge gate, the feed liquor pipe is located and is devolatilized in the cavity, the feed liquor end of feed liquor pipe communicates to the outside of shell through the inlet, the play liquid end of feed liquor pipe is located in the rotor, the drilled packing ring is equipped with in the rotor, the top of shell is located to first motor, the transmission shaft of first motor is worn to locate the top of shell and is connected with the rotor, first motor can drive the rotor and rotate for the central axis of shell, the second motor is connected with the inner tube and the second motor can drive the inner tube and rotate for the center pin of shell. The utility model discloses can accelerate the mobility of high viscosity fuse-element, improve and take off and wave efficiency, reduce and toast the processing time.

Description

Polymer devolatilization device

Technical Field

The utility model relates to a polymer processing technology field especially relates to a polymer takes off and waves device.

Background

In the process of developing light weight of automobiles, the amount of the polymer used on the automobiles is increased. With the improvement of the requirements of people on the quality of air in the vehicle, further requirements on the content of volatile organic compounds in the polymer are also provided.

Generally, the polymer modification process includes a devolatilization step in the kneading zone and after pelletization. Specifically, the mixing section is usually devolatilized by air stripping devolatilization, negative pressure multi-stage devolatilization and other processes; after granulation, the mixture is further devolatilized by baking. Indeed, the devolatization by baking is a remedial measure, and the baking time is often longer than 4 hours, and even extended to 48 hours. The baking devolatilization efficiency is extremely low, the energy consumption is high, and the continuous production is not facilitated. Therefore, devolatilization in the compounding section remains a major concern.

The devolatilization of the mixing section is carried out in the polymer molten state, and the volatile organic compounds foam from the polymer melt and then bubble migration to the surface of the polymer is realized, thus realizing the purpose of removing the devolatilized organic compounds from the polymer. In the traditional devolatilization process, stripping agents such as water, nitrogen, carbon dioxide and the like are used for improving the foaming and migration of volatile organic compounds, so that the devolatilization efficiency is improved. Due to the fact that the viscosity of the polymer is large, the foaming resistance of volatile organic compounds is large, bubble migration is difficult, and the defects of low devolatilization efficiency, unobvious effect and the like exist.

At present, a supergravity device is often used for polymer devolatilization, and a rotor rotating at a high speed is utilized to form a supergravity field, so that liquid forms tiny and extremely fine liquid drops, liquid threads and a liquid film, a gas-liquid interface can be rapidly updated, the gas-liquid mass transfer area is increased, and the gas-liquid mass transfer efficiency is improved. The liquid is thrown out from the rotor and then collides with the wall surface of the device, and flows out under the action of gravity, so that gas-liquid separation is realized. However, with polymers of high viscosity, rapid flow down of the polymer from the walls of the apparatus cannot be achieved, thereby limiting use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem be: the existing supergravity device can not realize the rapid flowing of high-viscosity polymers from the wall surface of the device, and has low devolatilization efficiency.

In order to achieve the above object, the utility model provides a polymer devolatilization device, including first motor, second motor, feed liquor pipe and from outer to interior shell, inner tube, the rotor of coaxial cover establishment in proper order, the inlet has been seted up at the top of shell, first discharge gate has been seted up in the middle of the bottom of shell, the open setting in top of inner tube, the second discharge gate has been seted up to the bottom of inner tube, the internal perisporium of inner tube reaches the interior roof of shell is injectd and is formed the devolatilization cavity, the devolatilization cavity passes through the second discharge gate and first discharge gate intercommunication to the outside of shell, the feed liquor pipe is located in the devolatilization cavity, the feed liquor end of feed liquor pipe communicates to the outside of shell through the inlet, the play liquid end of feed liquor pipe is located in the rotor, packing ring is equipped with in the rotor, first motor is located the top of shell, the transmission shaft of first motor wears to locate the top of shell with the rotor is connected, first motor can drive the rotor for the central axis of shell rotates, the second motor with the inner tube is connected just the second motor can drive the center pin for the inner tube rotates.

Preferably, a vacuum port for vacuumizing is formed in the side face of the shell, an air exhaust channel is formed between the top of the inner barrel and the inner top wall of the shell, and the devolatilization chamber is communicated with the vacuum port through the air exhaust channel.

Preferably, the rotor is cylindrical, a liquid outlet channel penetrating through a central shaft of the rotor is arranged in the rotor, the liquid outlet end is located in the liquid outlet channel, the packing ring comprises a plurality of straight plates, each straight plate is arranged at intervals along the radial direction, a guide channel is formed between every two adjacent straight plates, and the liquid outlet channel is communicated to the devolatilization chamber through the guide channel.

Preferably, one or more through holes are formed in the straight plate.

Preferably, the liquid outlet end is provided with a spraying device for distributing liquid.

Preferably, the rotor is arranged at the upper part of the inner cylinder, and the lower part of the inner cylinder is in a conical shape which is gradually reduced downwards.

Preferably, still include the bearing, the bearing is located the outer diapire of inner tube and/or the periphery wall of inner tube, the inner tube pass through the bearing with the shell is rotated and is connected.

Preferably, the rotation speed of the inner cylinder is 100 to 1000rpm, and the rotation speed of the rotor is 100 to 3000rpm.

Preferably, a heating device is arranged on the shell.

Preferably, the device further comprises a pump body and a liquid supply pipe, wherein one end of the liquid supply pipe is used for being communicated with the polymer, the other end of the liquid supply pipe is communicated with the liquid inlet end, and the pump body is connected to the liquid supply pipe in series.

The embodiment of the utility model provides a polymer takes off and waves device compares with prior art, and its beneficial effect lies in:

the utility model discloses polymer devolatilization device utilizes the mobility of the mode acceleration high viscosity polymer fuse-element of rotatory inner tube, has expanded the range of application of conventional hypergravity device, and it can improve its devolatilization efficiency after devolatilizing the polymer under the mixing section molten state, reduces the time of follow-up baking treatment, can realize serialization production, and this device is small, and the cost input is low, can realize online high efficiency, effectively devolatilizing.

Drawings

FIG. 1 is a schematic diagram illustrating the use of a polymer devolatilization apparatus in accordance with an embodiment of the present invention;

FIG. 2 is an isometric view of a polymer devolatilizer of an embodiment of the present invention, FIG. 1;

FIG. 3 is an isometric view of a polymer devolatilizer apparatus, an embodiment of the present invention, as illustrated in FIG. 2;

FIG. 4 is a front view of a polymer devolatilizer apparatus, in accordance with an embodiment of the present invention;

FIG. 5 is a top view of a polymer devolatilizer of an embodiment of the present invention;

FIG. 6 isbase:Sub>A sectional view taken along line A-A of FIG. 5;

FIG. 7 is an isometric view of the interior of an inner barrel in a polymer devolatilizer of an embodiment of the present invention;

figure 8 is an isometric view of a rotor in a polymer devolatilizer of the present invention.

In the figure, 1, a first motor; 2. a second motor; 3. a liquid inlet pipe; 31. a liquid inlet end; 32. a liquid outlet end; 4. a housing; 41. a liquid inlet; 42. a first discharge port; 43. a vacuum port; 5. an inner barrel; 51. a second discharge port; 52. a devolatilization chamber; 53. an air extraction channel; 6. a rotor; 61. a liquid outlet channel; 7. a packing ring; 71. a straight plate; 72. a guide channel; 8. a bearing; 9. a liquid supply tube; 91. and a pump body.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are used in the present invention as indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "connected," "connected," and "fixed" used in the present invention should be understood in a broad sense, and for example, the terms may be fixedly connected, detachably connected, or integrated; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

As shown in fig. 2 to 6, a polymer devolatilization device according to a preferred embodiment of the present invention includes a first motor 1, a second motor 2, a liquid inlet pipe 3, and a casing 4, an inner cylinder 5, and a rotor 6 coaxially sleeved from outside to inside in sequence, wherein a liquid inlet 41 is disposed at the top of the casing 4, a first discharge port 42 is disposed in the middle of the bottom of the casing 4, the top of the inner cylinder 5 is open, a second discharge port 51 is disposed at the bottom of the inner cylinder 5, the inner circumferential wall of the inner cylinder 5 and the inner top wall of the casing 4 define and form the devolatilization chamber 52, the devolatilization chamber 52 is communicated with the outside of the casing 4 through the second discharge port 51 and the first discharge port 42, the liquid inlet pipe 3 is disposed in the devolatilization chamber 52, a liquid inlet end 31 of the liquid inlet pipe 3 is communicated with the outside of the casing 4 through the liquid inlet 41, a liquid outlet end 32 of the liquid inlet pipe 3 is disposed in the rotor 6, a filler ring 7 is disposed in the rotor 6, the first motor 1 is disposed above the casing 4, a transmission shaft of the first motor 1 is connected with the second motor 5, and the rotor 4 is capable of rotating relative to the central axis of the inner cylinder 2.

The term "devolatilization" as used herein refers to the devolatilization of polymers.

The polymer under the molten state enters the rotor 6 through the liquid inlet end 31 to the liquid outlet end 32 of the liquid inlet pipe 3, the rotor 6 is driven by the first motor 1 to rotate, the polymer is thrown out of the rotor 6 after rotating along with the rotor 6 under the guiding action of the packing ring 7 to form liquid drops, liquid filaments and a liquid film, and then the liquid drops, the liquid filaments and the liquid film collide with the inner wall of the inner cylinder 5, the inner cylinder 5 is driven by the second motor 2 to rotate, so that the polymer on the inner wall is accelerated to flow to the first material outlet 42 at the bottom and then flows out through the second material outlet 51 of the shell 4, and the first material outlet 42 is connected with the second material outlet 51 of the inner cylinder 5 through a rotary joint. The process can separate volatile organic from polymer fast.

Further, as shown in fig. 2, a vacuum port 43 for vacuum pumping is formed in a side surface of the casing 4, an air suction passage 53 is formed between the top of the inner cylinder 5 and the inner top wall of the casing 4, and the devolatilization chamber 52 is communicated with the vacuum port 43 through the air suction passage 53. The vacuum pumping can make the devolatilization chamber 52 form negative pressure, reduce the saturated vapor pressure, accelerate the separation and volatilization of volatile organic compounds and polymers, and improve the devolatilization efficiency, wherein the vacuum degree range in the shell 4 can be set to be 0.06-0.1 (-Mpa); the top of the inner cylinder 5 and the inner top wall of the shell 4 are provided with a thin air extraction channel 53 which can prevent the polymer from being thrown out of the inner cylinder 5 in the devolatilization process.

Further, as shown in fig. 7 and 8, the rotor 6 is cylindrical, a liquid outlet channel 61 penetrating through a central axis of the rotor 6 is provided in the rotor 6, the liquid outlet end 32 is located in the liquid outlet channel 61, the packing ring 7 includes a plurality of straight plates 71, each of the straight plates 71 is arranged at intervals in a radial direction, a guide channel 72 is formed between two adjacent straight plates 71, and the liquid outlet channel 61 is communicated to the devolatilization chamber 52 through the guide channel 72. The packing rings 7 are straight plates 71 arranged in a radial shape, which can play a better role in guiding the polymer, so that the polymer can rotate along with the rotor 6 when flowing in a guide channel 72 in the rotor 6, local stirring is generated, a large amount of surface area which is updated rapidly is exposed, and liquid drops, liquid threads and a liquid film can be formed after the polymer is thrown out.

Further, one or more through holes are opened on the straight plate 71. The polymer can flow in each guide channel 72, so that the mutual movement between the polymer and the straight plate 71 is increased, and the shearing of the polymer by the straight plate 71 is improved.

Furthermore, the liquid outlet end 32 is provided with a spraying device for distributing liquid, and the polymer in a molten state can be uniformly distributed in the liquid outlet channel 61 when coming out from the liquid outlet end 32 through the spraying device. Further, the liquid inlet pipe 3 extends from the liquid inlet 41 at the top of the housing 4 to the center of the rotor 6 through the lower part of the rotor 6, and the port of the liquid outlet end 32 faces upward, so that the initial falling speed of the polymer at the outlet of the port can be reduced.

Further, the rotor 6 is disposed at an upper portion of the inner cylinder 5, and a lower portion of the inner cylinder 5 is tapered to be gradually reduced downward. Wherein the inclination angle of the inner peripheral wall of the inner cylinder 5 can be 45-85 degrees, which can accelerate the polymer to flow and flow out towards the second discharge hole 51, and avoid the polymer from being adhered on the inner peripheral wall of the inner cylinder 5 due to excessive adhesion.

Further, still include bearing 8, bearing 8 locates the outer diapire of inner tube 5 and/or the periphery wall of inner tube 5, inner tube 5 through bearing 8 with shell 4 rotates and is connected. So that the inner cylinder 5 and the outer shell 4 can keep stable rotation connection.

Further, the rotation speed of the inner cylinder 5 is 100 to 1000rpm, and the rotation speed of the rotor 6 is 100 to 3000rpm. The fast rotation speed of the rotor 6 can expose a large amount of surface area which is updated fast, and the polymer forms liquid drops, liquid filaments and liquid films after being thrown out from the rotor 6, the slow rotation speed of the inner cylinder 5 can make the liquid drops, the liquid filaments and the liquid film-shaped polymer attach to the inner wall and accelerate to slide out towards the second discharge hole 51 under the driving of the rotation of the inner wall.

Further, a heating device is arranged on the housing 4, the heating device has heating and heat-preserving functions, and can heat and protect the devolatilization chamber 52, so as to improve the devolatilization efficiency, wherein the heating temperature can be 0-350 ℃.

Further, as shown in fig. 1, the apparatus further includes a pump body 91 and a liquid supply pipe 9, one end of the liquid supply pipe 9 is used for communicating with the polymer, the other end of the liquid supply pipe 9 is communicated with the liquid inlet end 31, and the pump body 91 is connected in series to the liquid supply pipe 9. The polymer in a molten state coming out of the mixing section of the extruder enters from one end of the liquid supply end, is pressurized by the pump body 91 and is sent to the liquid inlet end 31 of the liquid inlet pipe 3 to enter the polymer devolatilization device.

The second motor 2 is disposed outside the housing 4, and may be in transmission connection with the inner cylinder 5 through a gear, a track, or other transmission members.

The implementation method of one specific embodiment of the polymer devolatilization device comprises the following steps: the polymer melt from the mixing section of the extruder is sent into a rotor 6 in a devolatilization chamber 52 through a melt pump by a liquid inlet pipe 3, and the vacuum degree of the devolatilization chamber 52 is-0.08 Mpa; the rotor 6 is driven by the first motor 1 to rotate at a high speed, the rotating speed is 2000rpm, and the rotor 6 is thrown out of the rotor 6 at a high speed through the packing ring 7 to form liquid drops, liquid filaments and a liquid film; then the melt collides with an inner cylinder 5, the inner cylinder 5 is driven by a second motor 2 to rotate, the rotating speed is 500rpm, and the inclination angle of the inner peripheral wall is 65 degrees; the melt is accelerated to flow to the second liquid outlet under the driving of the rotation of the inner cylinder 5, flows out of the shell 4 from the first liquid outlet, is pumped out for granulation by a melt pump, and the heating temperature of the heating device is 240 ℃ in the process.

Compared with the TVOC test of the granulated particles, the TVOC 24835 mu g/m3 of the common devolatilization granulation is devolatilized and granulated by the TVOC 8500 mu g/m3 of the polymer devolatilization device, and the devolatilization efficiency is improved by 65 percent.

To sum up, the embodiment of the utility model provides a polymer takes off and waves device, its mode that utilizes rotatory inner tube 5 has accelerated the mobility of high viscosity polymer fuse-element, has expanded the range of application of conventional hypergravity device, and it can improve its efficiency of taking off after taking off to the polymer under the mixing section molten state, reduces the time of follow-up stoving processing, can realize serialization production, and this device is small, and the cost input is low, can realize online high efficiency, effectively take off and wave.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (10)

1. A polymer devolatilization device is characterized by comprising a first motor, a second motor, a liquid inlet pipe, a shell, an inner cylinder and a rotor, wherein the shell, the inner cylinder and the rotor are sequentially and coaxially sleeved from outside to inside, the liquid inlet is formed in the top of the shell, a first discharge hole is formed in the middle of the bottom of the shell, the top of the inner cylinder is opened, a second discharge hole is formed in the bottom of the inner cylinder, the inner peripheral wall of the inner cylinder and the inner top wall of the shell are limited to form a devolatilization chamber, the devolatilization chamber is communicated to the outside of the shell through the second discharge hole and the first discharge hole, the liquid inlet pipe is arranged in the devolatilization chamber, the liquid inlet end of the liquid inlet pipe is communicated to the outside of the shell through the liquid inlet, the liquid outlet end of the liquid inlet pipe is located in the rotor, a packing ring is arranged in the rotor, the first motor is arranged above the shell, a transmission shaft of the first motor is arranged at the top of the shell in a penetrating manner and connected with the rotor, the first motor can drive the rotor to rotate relative to the central axis of the shell, the second motor is connected with the inner cylinder, and the second motor can drive the inner cylinder to rotate relative to the central axis of the shell.

2. The polymer devolatilization device according to claim 1, wherein a vacuum port for vacuum pumping is formed in a side surface of said casing, a suction passage is provided between a top portion of said inner tube and an inner top wall of said casing, and said devolatilization chamber is communicated with said vacuum port through said suction passage.

3. The polymer devolatilization apparatus as defined in claim 1 wherein said rotor is cylindrical, said rotor having a liquid outlet channel extending through a central axis thereof, said liquid outlet end being disposed within said liquid outlet channel, said packing ring comprising a plurality of straight plates, each of said plurality of straight plates being radially spaced apart, a guide channel being formed between adjacent ones of said plurality of straight plates, said liquid outlet channel being connected to said devolatilization chamber through said guide channel.

4. The polymer devolatilizer device as recited in claim 3 wherein said plate is formed with one or more through holes.

5. The polymer devolatilization apparatus as recited in claim 3 wherein said exit end is provided with a spray means for dispensing the liquid.

6. The polymer devolatilizer of claim 1 wherein said rotor is disposed at an upper portion of said inner barrel and a lower portion of said inner barrel is tapered to taper downwardly.

7. The polymer devolatilizer device as recited in claim 1 further comprising a bearing disposed at an outer bottom wall of the inner barrel and/or an outer peripheral wall of the inner barrel, the inner barrel being rotatably coupled to the housing via the bearing.

8. The polymer devolatilizer as claimed in any one of claims 1 to 7, wherein a rotation speed of said inner cylinder is from 100 to 1000rpm and a rotation speed of said rotor is from 100 to 3000rpm.

9. The polymer devolatilizer of claim 1 wherein said housing is provided with heating means.

10. The polymer devolatilizer device as claimed in claim 1, further comprising a pump body and a liquid supply tube, wherein one end of said liquid supply tube is adapted to communicate with said polymer, and the other end of said liquid supply tube is in communication with said liquid inlet end, and said pump body is connected in series to said liquid supply tube.

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