CN209934146U - Polyurethane coating degassing device - Google Patents
Polyurethane coating degassing device Download PDFInfo
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- CN209934146U CN209934146U CN201821611975.8U CN201821611975U CN209934146U CN 209934146 U CN209934146 U CN 209934146U CN 201821611975 U CN201821611975 U CN 201821611975U CN 209934146 U CN209934146 U CN 209934146U
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- polyurethane coating
- reaction kettle
- buffer tank
- electromagnetic valve
- vacuum
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- Degasification And Air Bubble Elimination (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The utility model belongs to the technical field of degasser, specifically disclose a polyurethane coating degasser, include: the upper part of the reaction kettle is provided with an air inlet and an air outlet; the nitrogen electromagnetic valve is arranged on the air inlet and is suitable for being communicated with the nitrogen supply device; the air outlet is provided with a first vacuum electromagnetic valve which is suitable for being communicated with a vacuumizing device; the liquid level alarm is arranged inside the reaction kettle and is suitable for detecting the liquid level height in the reaction kettle; and the central processing unit is electrically connected with the liquid level processor, the nitrogen electromagnetic valve and the first vacuum electromagnetic valve respectively. In the device, the liquid level alarm monitors the liquid level in the reaction kettle constantly, and controls the nitrogen solenoid valve and the first vacuum solenoid valve through the central processing unit, nitrogen is supplemented intermittently or vacuum pumping is performed, so that liquid materials are prevented from being pumped out, and the degassing quality is further improved by repeatedly pumping for multiple times.
Description
Technical Field
The utility model belongs to the technical field of degasser, concretely relates to polyurethane coating degasser.
Background
In the production process of polyurethane products, a special process is provided: carrying out reaction; three key processes: weighing, dewatering and degassing. The moisture curing system and the reactive polyurethane coating can generate CO by the reaction of trace water and isocyanate in the reaction process2And air is introduced into the product by stirring the product continuously from the beginning of the feeding. Because the prepolymer has certain viscosity, gas can be wrapped in the product, and if the prepolymer is directly used for construction, foaming can be caused, so that degassing in the last step of production is very critical.
The prior art generally pulls the vacuum directly to a maximum to separate the bubbles from the product. The biggest hidden trouble is that the prepolymer is easy to be pumped out along with bubbles, which wastes production cost and even blocks a vacuum pump, thereby affecting production efficiency.
Therefore, to overcome the above disadvantages, the present invention is directed to a polyurethane coating degassing device to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a polyurethane coating degasser to polyurethane coating degasses and takes out the problem of liquid material together easily among the solution prior art.
The utility model provides a following scheme:
a polyurethane coating degassing apparatus comprising: the upper part of the reaction kettle is provided with an air inlet and an air outlet; the nitrogen electromagnetic valve is arranged on the air inlet and is suitable for being communicated with a nitrogen supply device; a first vacuum electromagnetic valve is arranged on the air outlet and is suitable for being communicated with a vacuumizing device; the liquid level alarm is arranged inside the reaction kettle and is suitable for detecting the liquid level height in the reaction kettle; and the central processing unit is electrically connected with the liquid level processor, the nitrogen electromagnetic valve and the first vacuum electromagnetic valve respectively.
The apparatus for degassing a polyurethane coating material as described above further preferably further comprises: and the air pressure sensor is arranged in the reaction kettle, is electrically connected with the central processing unit and is suitable for monitoring the pressure in the reaction kettle.
The apparatus for degassing a polyurethane coating material as described above further preferably further comprises: the buffer tank is communicated between the first vacuum solenoid valve and the vacuumizing device; the buffer tank is provided with a gas inlet and a gas outlet; the gas inlet is communicated with the first vacuum solenoid valve; the gas outlet is communicated with the vacuumizing device.
In the degasifier for polyurethane coating material described above, it is further preferable that a second vacuum solenoid valve is provided at the gas outlet of the buffer tank, and the buffer tank is communicated with the vacuum extractor via the second vacuum solenoid valve.
In the above-described polyurethane paint degasifier, it is further preferable that a drain valve is further provided below the buffer tank, and adapted to drain water.
In the degasifier for polyurethane coating material described above, it is further preferable that the gas inlet is provided in the middle of the buffer tank, and the gas outlet is provided at the top of the buffer tank.
In the degasifier for polyurethane coating material described above, it is further preferable that a buffer net is further provided in the buffer tank, and the buffer net is provided between the gas inlet and the gas outlet.
In the degasifier for polyurethane coating material as described above, it is further preferable that the buffer tank is in a barrel shape and includes a barrel body and a barrel cover, and the barrel body and the barrel cover are hermetically mounted.
In the polyurethane coating degassing device, it is further preferable that the barrel cover is hemispherical and is adapted to be fastened with the barrel body; the buffering net is conical, and the vertex of the conical buffering net is connected with the barrel cover.
In the degasifier for polyurethane coating material as described above, it is further preferable that the buffer tank is communicated with the reaction kettle through a pipeline, one end of the pipeline is connected to the vacuum valve, and the other end of the pipeline extends into the lower part of the buffer net through the gas inlet.
The utility model provides a polyurethane coating degasser, include: the upper part of the reaction kettle is provided with an air inlet and an air outlet; the nitrogen electromagnetic valve is arranged on the air inlet and is suitable for being communicated with a nitrogen supply device; a first vacuum electromagnetic valve is arranged on the air outlet and is suitable for being communicated with a vacuumizing device; the liquid level alarm is arranged inside the reaction kettle and is suitable for detecting the liquid level height in the reaction kettle; and the central processing unit is electrically connected with the liquid level processor, the nitrogen electromagnetic valve and the first vacuum electromagnetic valve respectively. In the device, the liquid level alarm monitors the liquid level in the reaction kettle constantly, and controls the nitrogen solenoid valve and the first vacuum solenoid valve through the central processing unit, nitrogen is supplemented intermittently or vacuum pumping is performed, so that liquid materials are prevented from being pumped out, and the degassing quality is further improved by repeatedly pumping for multiple times.
Drawings
Fig. 1 is a schematic structural diagram of a polyurethane coating degassing device in the present invention.
Description of reference numerals:
1-a reaction kettle, 2-a liquid level alarm, 3-a nitrogen electromagnetic valve, 4-a first vacuum electromagnetic valve, 5-a buffer tank, 6-a second vacuum electromagnetic valve, 7-a drain valve, 8-a buffer net and 9-an air pressure sensor.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the present embodiment discloses a polyurethane coating degassing apparatus, including: the reaction kettle 1 is provided with an air inlet and an air outlet at the upper part of the reaction kettle 1, the air inlet is provided with a nitrogen electromagnetic valve 3, the nitrogen electromagnetic valve 3 is suitable for being communicated with a nitrogen supply device (not shown in the figure), the air outlet is provided with a first vacuum electromagnetic valve 4, and the first vacuum electromagnetic valve 4 is suitable for being communicated with a vacuumizing device (not shown in the figure); the liquid level alarm 2 is arranged inside the reaction kettle 1, and is suitable for detecting the liquid level height in the reaction kettle 1; and the central processing unit is electrically connected with the liquid level processor, the nitrogen electromagnetic valve 3 and the first vacuum electromagnetic valve 4 respectively.
Among the above-mentioned device, liquid level alarm 2 is arranged in detecting the liquid level height among reation kettle 1 to start the warning and with signal transmission to central processing unit when the liquid level surpasses its height, central processing unit is according to the signal that liquid level alarm 2 detected, intermittent type nature control nitrogen gas solenoid valve 3 and first vacuum solenoid valve 4 open, and then input nitrogen gas or through evacuating device extraction reation kettle 1 gas in to reation kettle 1 through nitrogen gas providing device, relapse many times, realize the degasification of polyurethane coating. The liquid material is prevented from being drawn out by the arrangement, the degassing efficiency is ensured by repeatedly introducing and drawing gas, and the degassing quality is improved.
Further, in the polyurethane coating degassing device provided in this embodiment, further include: and the air pressure sensor 9 is arranged in the reaction kettle 1, is electrically connected with the central processing unit, and is suitable for monitoring the pressure in the reaction kettle 1. The pressure sensor 9 is mainly used for detecting the pressure in the reaction kettle 1 after nitrogen is injected, and sending a signal to the central processing unit when the pressure in the reaction kettle 1 returns to an atmospheric pressure, at the moment, the liquid level in the reaction kettle 1 falls back, and the central processing unit receives the signal and instructs the nitrogen electromagnetic valve 3 to close and the first vacuum electromagnetic valve 4 to open so as to perform a new round of gas extraction.
Further, in the polyurethane coating degassing device provided in this embodiment, further include: the buffer tank 5 is communicated between the first vacuum solenoid valve 4 and the vacuumizing device; the gas inlet is communicated with the first vacuum solenoid valve; the gas outlet is communicated with the vacuumizing device. Reaction kettle 1's setting makes even polyurethane coating has some to take out along with gas, and the liquid of taking out also can be deposited in buffer tank 5, can prevent the suck-back, can effectively protect vacuum equipment again, still guarantees the quality of product in reaction kettle 1 simultaneously.
Preferably, a drain valve 7 suitable for draining water is further arranged below the buffer tank 5; and a second vacuum solenoid valve 6 is arranged at the gas outlet of the buffer tank 5, and the buffer tank 5 is communicated with the vacuumizing device through the second vacuum solenoid valve 6. The setting of drain valve 7 is arranged in getting rid of buffer tank 5 in the liquid, and the setting of second vacuum solenoid valve 6 is used for controlling the intercommunication between buffer tank 5 and the evacuating device, and under the conventional condition, both can separately use, and during operating condition, both cooperate the use, and when drain valve 7 opened, second vacuum solenoid valve 6 closed promptly for the flowing back, when drain valve 7 closed, second vacuum solenoid valve 6 opened for the evacuation.
Further, in the polyurethane coating degassing device provided in this embodiment, the gas inlet is disposed in the middle of the buffer tank, and the gas outlet is disposed at the top of the buffer tank; further, a buffer net 8 is further arranged in the buffer tank 5, and the buffer net is arranged between the gas inlet and the gas outlet. Preferably, the buffer tank 5 is barrel-shaped and comprises a barrel body and a barrel cover, and the barrel body and the barrel cover are installed in a sealing mode. The barrel cover is hemispherical and is suitable for being buckled with the barrel body; the buffer net 8 is conical, and the vertex of the conical buffer net 8 is connected with the barrel cover. The buffer tank 5 is communicated with the reaction kettle 1 through a pipeline, one end of the pipeline is connected with the vacuum valve, and the other end of the pipeline extends into the lower part of the buffer net 8 through the gas inlet. The storage and the buffering performance of the buffer tank 5 are further enhanced by the arrangement, and the smooth degassing of the polyurethane coating is ensured. Meanwhile, the barrel cover and the barrel body are arranged, so that the buffer tank can be cleaned regularly.
Further, the utility model also discloses a polyurethane coating degasification technology of going on according to above-mentioned polyurethane coating degasser:
in the production process of polyurethane coating, bubbles introduced by raw materials, stirring and the like are present in a liquid in which the frictional shear stress is expressed as:
the friction is then:
i.e. the gas must overcome the initial shear stress f0The relative movement can only occur later. Or when the shear stress does not reach or exceed f0The bubbles are not moving. Secondly, the Z of the polyurethane coating can be very large, and for the rising movement of the gas bubbles in the polyurethane coating, firstly the frictional resistance T opposite to the direction of movement must be overcome0. In addition, the pressure-difference resistance P must be overcome.
And because the air bubble is easy to deform, the air bubble is likely to be crushed under the combined action of two resistances and buoyancy, and the pressure difference resistance of the air bubble is obviously increased (the vortex area is increased) under the condition that the air bubble is crushed, so that the air bubble is difficult to rise in the polyurethane coating.
In addition, the polyurethane coating has a high surface tension, which is the force that acts on the liquid surface and tries to shrink the liquid surface to a minimum area. The bubbles must therefore rise to the level of the polyurethane coating liquid and must also overcome surface tension to be released.
Therefore, the buoyancy F (the weight of the bubble is ignored) of the bubble in the liquid must be larger than the sum of the friction resistance and the pressure difference resistance to rise from the polyurethane coating, namely the buoyancy F:
F>T+P(3)
when the temperature is not changed and the pressure is reduced, the bubbles in the liquid are all lifted to a position close to the liquid level without evacuation. It is known from thermal engineering that P1 · V1 is P2 · V2, and it is seen that the pressure decreases, the gas volume increases, and the buoyancy increases accordingly. When the buoyancy reaches to overcome the initial resistance, the bubbles can rise in the liquid by the buoyancy, and in the rising process, the pressure is continuously reduced, the volume is further expanded, the buoyancy is continuously increased, and the rising speed is also increased to the liquid level.
Based on the above principle, the present embodiment further provides a polyurethane coating degassing process based on the above apparatus, i.e., repeatedly performing vacuum pumping through vacuum pumping and nitrogen filling steps until five times of circulation. And (4) a five-step repeated vacuum pumping method, wherein the bubbles are enlarged by improving the vacuum degree, and the bubbles are broken in the process of recovering the normal pressure by filling nitrogen, so that the bubbles are completely pumped out for five times. The five-step repeated vacuum pumping method fully utilizes the form change of the bubbles in the polyurethane coating, is beneficial to the bubbles to be separated in the shortest time, ensures the quality of the polyurethane coating and simultaneously improves the production efficiency.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A polyurethane coating degassing device is characterized by comprising:
the upper part of the reaction kettle is provided with an air inlet and an air outlet; the nitrogen electromagnetic valve is arranged on the air inlet and is suitable for being communicated with a nitrogen supply device; a first vacuum electromagnetic valve is arranged on the air outlet and is suitable for being communicated with a vacuumizing device;
the liquid level alarm is arranged inside the reaction kettle and is suitable for detecting the liquid level height in the reaction kettle;
and the central processing unit is respectively electrically connected with the liquid level alarm, the nitrogen electromagnetic valve and the first vacuum electromagnetic valve.
2. The degassing apparatus for polyurethane coating according to claim 1, further comprising:
and the air pressure sensor is arranged in the reaction kettle, is electrically connected with the central processing unit and is suitable for monitoring the pressure in the reaction kettle.
3. The degassing apparatus for polyurethane coating according to claim 1, further comprising:
the buffer tank is communicated between the first vacuum solenoid valve and the vacuumizing device; the buffer tank is provided with a gas inlet and a gas outlet; the gas inlet is communicated with the first vacuum solenoid valve; the gas outlet is communicated with the vacuumizing device.
4. The degassing apparatus for polyurethane coating according to claim 3,
and a second vacuum electromagnetic valve is arranged at the gas outlet of the buffer tank, and the buffer tank is communicated with the vacuumizing device through the second vacuum electromagnetic valve.
5. The degassing apparatus for polyurethane coating according to claim 3,
and a drain valve is arranged below the buffer tank and is suitable for draining water.
6. The degassing device for polyurethane coating according to claim 5, wherein the gas inlet is disposed at the middle part of the buffer tank, and the gas outlet is disposed at the top part of the buffer tank.
7. The degassing device for polyurethane coating according to claim 6, wherein a buffer net is further disposed in the buffer tank, and the buffer net is disposed between the gas inlet and the gas outlet.
8. The degassing apparatus for polyurethane coating according to claim 7,
the buffer tank is barrel-shaped and comprises a barrel body and a barrel cover, wherein the barrel body and the barrel cover are hermetically arranged.
9. The degassing apparatus for polyurethane coating according to claim 8,
the barrel cover is hemispherical and is suitable for being buckled with the barrel body; the buffering net is conical, and the vertex of the conical buffering net is connected with the barrel cover.
10. The degassing apparatus for polyurethane coating according to claim 9,
the buffer tank is communicated with the reaction kettle through a pipeline, one end of the pipeline is connected with the first vacuum solenoid valve, and the other end of the pipeline extends into the lower part of the buffer net through the gas inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821611975.8U CN209934146U (en) | 2018-09-29 | 2018-09-29 | Polyurethane coating degassing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821611975.8U CN209934146U (en) | 2018-09-29 | 2018-09-29 | Polyurethane coating degassing device |
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| CN209934146U true CN209934146U (en) | 2020-01-14 |
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| CN201821611975.8U Active CN209934146U (en) | 2018-09-29 | 2018-09-29 | Polyurethane coating degassing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112263850A (en) * | 2020-09-30 | 2021-01-26 | 青岛双瑞海洋环境工程股份有限公司 | Gas-liquid separation device for sodium hypochlorite generator |
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2018
- 2018-09-29 CN CN201821611975.8U patent/CN209934146U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112263850A (en) * | 2020-09-30 | 2021-01-26 | 青岛双瑞海洋环境工程股份有限公司 | Gas-liquid separation device for sodium hypochlorite generator |
| CN112263850B (en) * | 2020-09-30 | 2022-04-26 | 青岛双瑞海洋环境工程股份有限公司 | Gas-liquid separation device for sodium hypochlorite generator |
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