CN100376609C - Dry method of particles in suspending resin of poluterrafluoroethylenel - Google Patents
Dry method of particles in suspending resin of poluterrafluoroethylenel Download PDFInfo
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- CN100376609C CN100376609C CNB200610166289XA CN200610166289A CN100376609C CN 100376609 C CN100376609 C CN 100376609C CN B200610166289X A CNB200610166289X A CN B200610166289XA CN 200610166289 A CN200610166289 A CN 200610166289A CN 100376609 C CN100376609 C CN 100376609C
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Abstract
This invention discloses a method for drying particles in polytetrafluoroethylene (PTFE) suspension resin. The method adopts compressed air as the drying medium, and dries the particles in a flash evaporator by controlling the air flux of drying region and the temperature of feeding air. The treated particles have water content of 0.03%, and the productivity is 150-300 kg/h. This invention also discloses the apparatus to realize the drying method.
Description
Technical field
The invention belongs to Polymer Synthesizing and manufacture field, relate to the drying means of particle in a kind of polytetrafluoroethylsuspending suspending resin.
Background technology
Teflon resin is described as " plastics king " because of its superior thermotolerance, weathering resistance, chemical resistance, low frictional properties, good premium propertiess such as anti-electrical insulating property, has been widely used in the national economy field at present.
The production of teflon resin (PTFE) has two kinds of methods, and promptly suspension method and dispersion method are two kinds.
Japan Daishin Machines Co., Ltd. is the continuous preparation method who discloses the polytetrafluoroethylene (PTFE) wet powder among the Chinese patent CN1045589 of " the continuous preparation method of polytetrafluoroethylwet wet powder " at the exercise question of China's application, comprise that a step utilizes a kind of machinery that produces high shear forces, make the PTFE water dispersion realize the pulping effect continuously, utilize a kind of vertical stirring tower with a step, make slurry realize granulation continuously.This is a kind of preparation method of dispension polymerized poly.
Suspension method is under the effect of stirring by brute force, monomer is dispersed into countless little liquid pearls suspends in water and caused and the polyreaction of carrying out by oil-soluble initiator.Exercise question adds three grades of placed in-line whipping devices continuously for the PTFE that the U.S. Pat 4439385 of " in liquid medium PTFE powder condense continuously technology " discloses suspension polymerization, condense into powder through stirring to pulverize, its powder---liquid mixture reclaims from this equipment continuously, liquid is separated, obtain final PTFE product, this method complex process, the equipment requirements height.
In the tradition suspension method among the PTFE particle dehumidification system forms by dryer section and cooling section, production unit is more, dry pipeline of needs and cooling line are longer, limited by the production scene spatial; Complex process, the high and waste energy consumption of cost.
CN1184821A discloses a kind of continuous production processes of suspension method polytetrafluorethylepowder powder, be to smash to pieces and smash to pieces in the device and wash with being sent to special use behind tetrafluoroethylene coarse particles after the polyreaction and the deionized water uniform mixing continuously, form the wet fine particle that purifies, material and water sepn are exported to have in the moisture eliminator that purifies warm air carry out reinforcing mass transfer, heat transfer by regulating rotating speed that special use smashs the spiral separation auger in the device to pieces again, and then carry out gas solid separation by cyclonic separator, generate the exsiccant polytetrafluorethylepowder powder.Gas solid separation is secondary separation, and preceding once is that warm air is separated with fine particle, after once be that freezing air is separated with fine particle, sepn process is long, equipment is many, power consumption is big.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of expansion drying technology, use particle in the dry polytetrafluoroethylsuspending suspending resin of flash distillation main frame.Not only improve the deficiency in the traditional technology but also can satisfy the processing requirement of production.
The invention provides the drying means of particle in a kind of polytetrafluoroethylsuspending suspending resin, it is characterized in that, use particle in the dry polytetrafluoroethylsuspending suspending resin of flash distillation main frame.
Preferably, the compressed air of wet stock is induced and is added the expansion drying main frame, mixes with warm air, finishes drying in the flash distillation main frame.
The drying means of particle in a kind of polytetrafluoroethylsuspending suspending resin provided by the invention, concrete steps are as follows:
Pressurized air in the gas storage bag becomes the qualified dry air (20 ℃～50 ℃) of using after decompression, dehumidifying, filtering, entered in the expansion drying main frame by blast inlet.The compressed air of wet stock is induced and is added the expansion drying main frame, mix with warm air, after in main drying, finishing drying, enter gas solid separation system (cyclonic separator, falling dust room, fly-ash separator), most of material is discharged dehumidification system from cyclonic separator, few partial material is intermittently discharged dehumidification system from falling dust room and sack cleaner, handles in addition.
The drying means of particle the steps include: in the described polytetrafluoroethylsuspending suspending resin
1) pressurized air in the gas storage bag is entered in the expansion drying main frame by blast inlet after decompression, dehumidifying, filtering;
2) the compressed air of wet stock is induced and is added the expansion drying main frame, mixes with warm air in the step 1), finishes drying in main drying;
3) gas step 2) enters the gas solid separation system, and the solid materials that accounts for material gross weight 90-98% is discharged dehumidification system from cyclonic separator, finished product packing; Account for material gross weight 2-10% gas and fine powder material intermittently discharge dehumidification system from falling dust room and fly-ash separator, the recycling; Described gas solid separation system comprises cyclonic separator, falling dust room and fly-ash separator.
Preferably, the dryer section air flow quantity is 3600～5000 kg/h step 2); Inlet temperature is 20 ℃～50 ℃.
Preferably, described pressurized air is induced and is meant and utilizes pressurized air that the powder material is sucked the Venturi meter feeder, and feeding quantity can be by compressed-air actuated pressure and flow adjustment.
Preferably, two feed bins are set under the discharge port of cyclonic separator, join two butterfly valves, on the feed bin of its middle and lower part a compressed-air actuated interface is set, when operation, can feed desiccant pressurized air, to reach the purpose that discharge port keeps certain malleation.
The present invention also provides a kind of device of realizing the method for the invention, comprising:
A compressed air reservoir is used for storing compressed air;
A reducing valve is positioned at after the compressed air reservoir, is used for the pressurized air decompression;
A turbine butterfly valve is positioned at after the reducing valve, is used to control compressed air require;
A plate hole under meter is installed on after the turbine butterfly valve, is used for measuring and the control compressed air require;
A steam radiator links to each other with the plate hole under meter, is used for the pressurized air dehumidifying;
A strainer is positioned at after the steam radiator, is used for pressurized air and filters;
An expansion drying main frame is used for dry polytetrafluoroethylsuspending suspending resin particle;
One cover gas solid separation system comprises cyclonic separator, falling dust room, fly-ash separator, is used for separating and recycle-water steam, fine powder and particle;
An induced draft fan is positioned at after the gas solid separation system, is used to draw air-flow.
Aforesaid device is connected by pipe sealing.
Preferably, one pneupress system is arranged, be used for pressurized air the powder material is sucked the Venturi meter feeder at the opening for feed of expansion drying main frame.
Preferably, two feed bins are set under the discharge port of cyclonic separator, join two butterfly valves, on the feed bin of its middle and lower part a compressed-air actuated interface is set, be used for when operation, feeding the treated pressurized air that native system is used, to reach the purpose that discharge port keeps certain malleation.
This technology, outstanding advantage are exactly the application in the particle dehumidification system in PTFE of flash distillation main frame.Use the flash distillation main frame to replace particle dehumidification system and cooling system in the conventional P TFE technology, technical process is simple, and energy consumption reduces and is not subject to production scene spatial restriction.
Description of drawings
Fig. 1 is an expansion drying general flow chart of the present invention.Wherein, 1 is compressed air reservoir, and 2 is reducing valve, and 3 is the turbine butterfly valve, and 4 is the plate hole under meter, 5 is steam radiator, and 6 is strainer, and 7 is feed bin, and 8 are the flash distillation main frame, and 9 is feed bin 1,10 is butterfly valve, and 11 is cyclonic separator, and 12 is settling pocket, and 13 is fly-ash separator, and 14 is induced draft fan.
Embodiment
Following examples are to further specify of the present invention, but the present invention is not limited thereto.
Embodiment 1:
As shown in Figure 1, the pressurized air of compressed air reservoir (1) lining is after reducing valve (2) decompression, steam radiator (5) dehumidifying, strainer (6) filter, become qualified dry with air (20 ℃～50 ℃ of temperature, dew-point temperature-20 ℃～50 ℃), enter in the expansion drying main frame (8).The compressed air of wet stock is induced and is added the expansion drying main frame, mix with warm air, after in main drying (8), finishing drying, enter gas solid separation system (11 cyclonic separators, 12 falling dust room, 13 fly-ash separators) then, most solid materials (about 95%) is discharged dehumidification system, finished product packing from cyclonic separator; The fine powder material of a spot of gas (about 5%) is intermittently discharged dehumidification system from falling dust room and fly-ash separator, recycling.
The application in the particle dehumidification system in PTFE of flash distillation main frame can make the material moisture of handling be controlled at 0.03%, and output 150KG/h～300KG/h can satisfy the dry requirement of particle among the PTFE fully.
Embodiment 2:
As shown in Figure 1, the pressurized air of compressed air reservoir (1) lining is after reducing valve (2) decompression, steam radiator (5) dehumidifying, strainer (6) filter, become qualified dry with air (20 ℃～50 ℃ of temperature, dew-point temperature-20 ℃～50 ℃), enter in the expansion drying main frame (8).The compressed air of wet stock is induced and is added the expansion drying main frame, mix with warm air, after in main drying (8), finishing drying, enter gas solid separation system (11 cyclonic separators, 12 falling dust room, 13 fly-ash separators) then, two feed bins are set under the discharge port of cyclonic separator, join two butterfly valves, on the feed bin of its middle and lower part a compressed-air actuated interface is set, when operation, can feed desiccant pressurized air, to reach the purpose that discharge port keeps certain malleation.After the separation, most solid materials (98%) is discharged dehumidification system, finished product packing from cyclonic separator; The fine powder material of a spot of gas (2%) is intermittently discharged dehumidification system from falling dust room and sack cleaner, recycling.
The application in the particle dehumidification system in PTFE of flash distillation main frame can make the material moisture of handling be controlled at 0.03%, and output 150kg/h～300kg/h can satisfy the dry requirement of particle among the PTFE fully.
Illustrate:
1. this dehumidification system used medium is a pressurized air, 3～8kgf/cm
2, dew-point temperature-20 ℃～50 ℃.
2. the about 3600kg/h～5000kg/h of dryer section air flow quantity.
3. the dryer section thermal source is saturation steam and electricity, vapor pressure 8kgf/cm
2
4. total system is provided with 8 pressure taps, 4 points for measuring temperature.
5. inlet temperature is 20 ℃～50 ℃.
Claims (9)
1. the drying means of particle in the polytetrafluoroethylsuspending suspending resin is characterized in that, uses particle in the dry polytetrafluoroethylsuspending suspending resin of expansion drying main frame.
2. the drying means of particle in the polytetrafluoroethylsuspending suspending resin described in claim 1 is characterized in that, the compressed air of wet stock is induced and added the expansion drying main frame, mixes with warm air, finishes drying in the expansion drying main frame.
3. the drying means of particle the steps include: in the polytetrafluoroethylsuspending suspending resin as claimed in claim 1 or 2
1) pressurized air in the gas storage bag is entered in the expansion drying main frame by blast inlet after decompression, dehumidifying, filtering;
2) the compressed air of wet stock is induced and is added the expansion drying main frame, mixes with warm air in the step 1), finishes drying in main drying;
3) gas step 2) enters the gas solid separation system, and the solid materials that accounts for material gross weight 90-98% is discharged dehumidification system from cyclonic separator, finished product packing; Account for material gross weight 2-10% gas and fine powder material intermittently discharge dehumidification system from falling dust room and fly-ash separator, the recycling; Described gas solid separation system comprises cyclonic separator, falling dust room and fly-ash separator.
4. the drying means of particle is characterized in that step 2 in the polytetrafluoroethylsuspending suspending resin as claimed in claim 3) in the dryer section air flow quantity be 3600kg/h～5000kg/h; Inlet temperature is 20 ℃～50 ℃.
5. the drying means of particle in the polytetrafluoroethylsuspending suspending resin as claimed in claim 3, it is characterized in that, described pressurized air is induced and is meant and utilizes pressurized air that the powder material is sucked the Venturi meter feeder, and feeding quantity can be by compressed-air actuated pressure and flow adjustment.
6. the drying means of particle in the polytetrafluoroethylsuspending suspending resin as claimed in claim 3, it is characterized in that, two feed bins are set under the discharge port of cyclonic separator, join two butterfly valves, on the feed bin of its middle and lower part a compressed-air actuated interface is set, when operation, can feed desiccant pressurized air, to reach the purpose that discharge port keeps certain malleation.
7. realize the device of the described method of claim 1, comprising:
A compressed air reservoir is used for storing compressed air;
A reducing valve is positioned at after the compressed air reservoir, is used for the pressurized air decompression;
A turbine butterfly valve is positioned at after the reducing valve, is used to control compressed air require;
A plate hole under meter is installed on after the turbine butterfly valve, is used for measuring and the control compressed air require;
A steam radiator links to each other with the plate hole under meter, is used for the pressurized air dehumidifying;
A strainer is positioned at after the steam radiator, is used for pressurized air and filters;
An expansion drying main frame is used for dry polytetrafluoroethylsuspending suspending resin particle;
One cover gas solid separation system comprises cyclonic separator, falling dust room, fly-ash separator, is used for separating and recycle-water steam, fine powder and particle;
An induced draft fan is positioned at after the gas solid separation system, is used to draw air-flow;
Aforesaid device is connected by pipe sealing.
8. device as claimed in claim 7 is characterized in that, at the opening for feed of expansion drying main frame one pneupress system is arranged, and is used for pressurized air the powder material is sucked the Venturi meter feeder.
9. device as claimed in claim 7, it is characterized in that, two feed bins are set under the discharge port of cyclonic separator, join two butterfly valves, on the feed bin of its middle and lower part a compressed-air actuated interface is set, be used for when operation, feeding desiccant pressurized air, to reach the purpose that discharge port keeps certain malleation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610166289XA CN100376609C (en) | 2006-12-25 | 2006-12-25 | Dry method of particles in suspending resin of poluterrafluoroethylenel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610166289XA CN100376609C (en) | 2006-12-25 | 2006-12-25 | Dry method of particles in suspending resin of poluterrafluoroethylenel |
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| Publication Number | Publication Date |
|---|---|
| CN101003593A CN101003593A (en) | 2007-07-25 |
| CN100376609C true CN100376609C (en) | 2008-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200610166289XA Active CN100376609C (en) | 2006-12-25 | 2006-12-25 | Dry method of particles in suspending resin of poluterrafluoroethylenel |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700027B (en) * | 2012-05-23 | 2014-08-20 | 中昊晨光化工研究院 | Teflon drying system and application thereof |
| CN102914123B (en) * | 2012-09-21 | 2014-09-17 | 中昊晨光化工研究院有限公司 | Method for drying polytetrafluoroethylene dispersion resin |
| CN107449264B (en) * | 2017-09-15 | 2023-05-26 | 四川宏图普新微波科技有限公司 | Polytetrafluoroethylene dispersion resin particle wet material drying system and method |
| CN109705239B (en) * | 2018-12-19 | 2021-07-23 | 福建三农新材料有限责任公司 | Continuous post-treatment system and method for polytetrafluoroethylene dispersion resin |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4774304A (en) * | 1981-09-09 | 1988-09-27 | Hoechst Aktiengesellschaft | Molding powder comprising agglomerated particles of PTFE compounds |
| CN1184821A (en) * | 1997-12-29 | 1998-06-17 | 上海氯碱化工股份有限公司 | Suspension process for continuous prepn. of polytetrafluorethylene powder |
-
2006
- 2006-12-25 CN CNB200610166289XA patent/CN100376609C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4774304A (en) * | 1981-09-09 | 1988-09-27 | Hoechst Aktiengesellschaft | Molding powder comprising agglomerated particles of PTFE compounds |
| CN1184821A (en) * | 1997-12-29 | 1998-06-17 | 上海氯碱化工股份有限公司 | Suspension process for continuous prepn. of polytetrafluorethylene powder |
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| CN101003593A (en) | 2007-07-25 |
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