CN2878389Y - Thin film processing device for separating dissociative monomer in polyurethane addition compound - Google Patents
Thin film processing device for separating dissociative monomer in polyurethane addition compound Download PDFInfo
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- CN2878389Y CN2878389Y CN 200520067999 CN200520067999U CN2878389Y CN 2878389 Y CN2878389 Y CN 2878389Y CN 200520067999 CN200520067999 CN 200520067999 CN 200520067999 U CN200520067999 U CN 200520067999U CN 2878389 Y CN2878389 Y CN 2878389Y
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- scratch board
- thin
- film evaporator
- main shaft
- processing device
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Abstract
A type of membrane treatment equipment used to separate free monomers in polyurethane additive products comprises a film evaporator. A main agitation shaft is provided in the film evaporator; an agitation scraper is provided on the main agitation shaft; a feed port, a secondary vapor outlet and a discharge port are provided on a film evaporator; a fixed straight agitation scraper, a fixed spiral agitation scraper and a fixed spiral agitation scraper are provided on the main agitation shaft; two or above secondary vapor outlets are provided on the film evaporator. The movable agitation scrapers are hinged on the main agitation shaft, arranged in two to eight rows radially along the main agitation shaft with one or above movable agitation scrapers each. The fixed straight agitation scrapers are fixed on the main agitation shaft, arranged in two to eight rows radially along the main agitation shaft with a single fixed straight agitation scraper each. This utility model is simple operation and high working efficiency, and can be used to separate solutes from thermosensitive solvents with great viscosity variations, especially to separate free monomers in polyurethane additive products.
Description
Technical field
The utility model relates to a kind of film processing device that separates the polyurethane adducts free monomers.
Background technology
Polyurethane coating is very swift and violent in Development in China at present, it is the maximum kind in the existing solvent based coating, the paint film of polyurethane coating has advantages such as hardness height, good toughness, chemicals-resistant, fast drying, so it is widely used on automobile, building and the electrical equipment, and occupies dominant position in furniture house ornamentation coating.
Polyurethane adducts is commonly used for the polyisocyanate component of polyurethane coating, and vulcabond commonly used and polyol reaction are synthetic in the actual production.In reaction is synthetic, owing to have a spot of diisocyanate monomer not participate in reaction, and remain among the system, in construction and drying process, these diisocyanate monomers evaporate, and will produce harm greatly to HUMAN HEALTH and surrounding environment.
It is not ideal to add the domestic production treatment process, and there are shortcomings such as free monomer content height, viscosity is big, toxicity is big in polyurethane curing agent.
The free diisocyanate monomer is to obtain the polyisocyanates of low free diisocyanate monomer in the common at present employing film processing device evaporation polyurethane curing agent.
Chinese patent CN2551311 improves thin film evaporation equipment, adopts the round-robin mode to separate, and can improve product purity to a certain extent; But it is only applicable to non-heat-sensitive materials, and for heat-sensitive substance such as polyisocyanates, long-term circulation heating will cause material aging, degradation, and color and luster is deepened.
A kind of short distance thin film distillation equipment is arranged in the thin film evaporation equipment, also be molecular distillation method, its isolating principle and film evaporation method are in full accord.Its outstanding feature is that the secondary steam of TDI cools off rapidly and the discharge system at device interior.Molecular distillation method (short distance film evaporation method) is applicable to the feed separation that viscosity is lower, and the material viscosity that thin-film evaporator can be handled is high a lot, for example based on the TDI affixture of the polyvalent alcohol of TMP.
Chinese patent CN1583846A report adopts inner-cooled (short distance thin film distillation method) or external-cooling type thin-film evaporator, and by three grades of separation, free TDI content is lower than 0.5% (75% solid content meter).Its outstanding feature is to have utilized high boiling entrainment agent, and the isocyanate-monomer of remnants at high temperature is evaporated.The use of this entrainment agent will inevitably increase the cost of product; Contain free monomer in the entrainment agent simultaneously, exist entrainment agent to recycle difficulty; Simultaneously also can residual more entrainment agent in the product, because the boiling point height of entrainment agent, volatilization difficulty in use produces detrimentally affect to the terminal use of product.
The utility model content
The purpose of this utility model is to provide a kind of simple and reasonable, easy and simple to handle, high efficiency, can be used to separate thermo-sensitivity viscosity changes the solvent in the span solvent greatly and the film processing device that separates the polyurethane adducts free monomers of solute, to overcome weak point of the prior art.
A kind of film processing device that separates the polyurethane adducts free monomers by this purpose design, comprise thin-film evaporator, be provided with the stirring main shaft in the thin-film evaporator, stir main shaft and be provided with stirring scratch board, thin-film evaporator is provided with opening for feed, secondary steam outlet and discharge opening, its constitutional features is to stir main shaft to be provided with movable stirring scratch board and fixing straight stirring scratch board, or movable stirring scratch board and fixing helical stir scraper plate, or fixing straight stirring scratch board and fixing helical stir scraper plate, or movable stirring scratch board, fixing straight stirring scratch board and fixing helical stir scraper plate; Thin-film evaporator is provided with two and above secondary steam outlet.
Above-mentioned movable stirring scratch board is hinged on and stirs on the main shaft, and along stirring main shaft radial arrangement two to eight row, every row are provided with one deck and above movable stirring scratch board.
Above-mentioned fixing straight stirring scratch board is fixed in and stirs on the main shaft, along stirring main shaft radial arrangement two to eight row, whenever classifies the fixing straight stirring scratch board of monolithic as.
Above-mentioned fixedly helical stir scraper plate structure in the shape of a spiral is fixed on the stirring main shaft, stirs main shaft and is provided with two to eight fixedly helical stir scraper plates.
Above-mentioned movable stirring scratch board and/or fixing straight stirring scratch board and/or fixedly the helical stir scraper plate join successively.
Above-mentioned secondary steam outlet is arranged on thin-film evaporator epimere and/or hypomere, and number is two to eight.
Above-mentioned secondary steam outlet has three, is provided with one in thin-film evaporator epimere place, has two in the thin-film evaporator lower section.
Above-mentioned thin-film evaporator secondary steam outlet is connected with heat exchanger; Heat exchanger joins with secondary steam collection container, vacuum apparatus successively.
Above-mentioned thin-film evaporator is provided with distributor in the opening for feed place, and distributor and stirring main shaft and stirring scratch board are concentric.
Be provided with heating unit around the above-mentioned thin-film evaporator; Discharge opening is connected with the latting drown container by a hydraulic transmission.
The utility model adopts that three grades of divided thin films are big from facility investment, contains shortcoming such as entrainment agent in the complex manufacturing, product at existing film evaporation method, a kind of film processing device that adopts single-stage film separating isocyanate is provided, but single vaporization is gone on a tour from monomer less than 0.5%, the polyisocyanates product of solid content more than 75%, reduce investment, simplify technology, improved production efficiency greatly.
Principle of work of the present utility model may be interpreted as: movable stirring scratch board is suitable for the low viscosity material, and the helical stir scraper plate is suitable for high-viscosity material, and straight stirring scratch board then falls between.Separation along with vulcabond, the viscosity of isocyanate mixture sharply increases, and only use wherein a kind of scraper plate in above-mentioned three kinds of scraper plates in the known document, all because not matching of viscosity influenced actual working efficiency, therefore, the utility model makes up three kinds of scraper plates simultaneously in same thin-film evaporator, improved separation efficiency greatly; In the known references only with upper outlet or down outlet as the outlet of secondary steam, increased the effusion distance of part secondary steam, cause the condensation of secondary steam in thin-film evaporator, influenced separation efficiency, the effusion distance of secondary steam has then been shortened in multiple exit setting of the present utility model, has improved separation efficiency.
The utility model compared with prior art has following advantage:
One, compare with Chinese patent CN2551311, the utility model does not use circulation technology, has reduced material residence time at high temperature, has avoided that material is aging, degradation and color and luster deepen;
Two, compare with the described film evaporation method of Chinese patent CN1583846A, the utility model adopts the single-stage film, and technology is simple, less investment; Do not add entrainment agent, greatly reduce the recycling problem of production cost and entrainment agent; Do not contain impurity such as entrainment agent in the solidifying agent yet; Material loss drops to minimum;
Three, compare the utility model bringing normally into operation production with domestic other existing similar technology.
The utility model is simple and reasonable, easy and simple to handle, high efficiency, can be used to separate thermo-sensitivity viscosity and changes solvent and solute in the span solvent greatly, particularly separates the free monomer in the polyurethane adducts.
Description of drawings
Fig. 1 is the utility model one example structure synoptic diagram.
Fig. 2 is the broken section structural representation of thin-film evaporator.
Fig. 3 is an A-A section structure for amplifying synoptic diagram among Fig. 2.
Fig. 4 is a B-B section structure for amplifying synoptic diagram among Fig. 2.
Fig. 5 is a C-C section structure for amplifying synoptic diagram among Fig. 2.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Among the figure, V1 is a header tank, and P2 is a material-handling pump, P1 is a material-handling pump, and H1 is a thin-film evaporator, and V2 is the heavy constituent receiving tank, H2 is a pipe bundle condenser, and V3 is the light constituent receiving tank, and z1 is the vacuum unit, M is a fire proof motor, and L1 is a heat exchanger, and 1 is liquid storage container, 2 is opening for feed, and 3 is distributor, and 4 is thin-film evaporator, 5 is heating unit, 6,7,8 are the secondary steam outlet, and 9 is the latting drown container, and 10 is heat exchanger, 11 is the secondary steam receiving vessel, 12 is vacuum apparatus, and 13 is movable stirring scratch board, and 14 are fixing straight stirring scratch board, 15 are fixing helical stir scraper plate, 16 is discharge opening, and 17 is temperature sensor, and 20 for stirring main shaft, 21 is frame, and 22 is fire proof motor.
Referring to Fig. 1-Fig. 5, the film processing device of this separation polyurethane adducts free monomers, comprise thin-film evaporator 4, be provided with in the cylindrical process vessel of thin-film evaporator and stir main shaft 20, stir and be respectively arranged with movable stirring scratch board 13, fixing straight stirring scratch board 14 and fixing helical stir scraper plate 15 on the main shaft 20 vertically.
Movable stirring scratch board 13 is hinged on and stirs on the main shaft 20, and along stirring main shaft 20 radial arrangement three row, every row are provided with 17 layers movable stirring scratch board 13; Fixing straight stirring scratch board 14 is fixed in and stirs on the main shaft 20, along stirring main shaft 20 radial arrangement four row, whenever classifies the fixing straight stirring scratch board of monolithic as; Fixedly helical stir scraper plate 15 in the shape of a spiral structure be fixed in and stir on the main shaft 20, stir main shaft 20 and be provided with four fixedly helical stir scraper plates.
Herein concrete number of each stirring scratch board and position can be set according to practical situation, can be according to inventory or the different stirring scratch board of viscosity of materials combination.Straight stirring scratch board and helical stir scraper plate 15 being fixed in stirring on the main shaft, is in order further to improve its rigidity because more toward below, viscosity of materials is high more.
Movable stirring scratch board 13, fixing straight stirring scratch board 14 and fixedly helical stir scraper plate 15 join successively.In actual production, can the transition stirring scratch board be set between the plate in being stirred to of all size.
Secondary steam outlet on the thin-film evaporator 4 has three, and 4 epimere places are provided with one in thin-film evaporator, have two in the thin-film evaporator lower section.
Look thin-film evaporator height and stirring extent, can more secondary steam outlet be set in thin-film evaporator 4 epimeres and hypomere.The outlet of thin-film evaporator 4 secondary steams is connected with heat exchanger 10; Heat exchanger 10 joins with secondary steam collection container 11, vacuum apparatus 12 successively.
Thin-film evaporator 4 is provided with its top feed mouth 2, and the bottom is provided with discharge opening 16, and thin-film evaporator 4 is provided with distributor 3 in opening for feed 2 places, and distributor 3 and stirring main shaft 20 and stirring scratch board are concentric.In order to increase the flowability of material, around thin-film evaporator 4, be provided with heating unit 5.Discharge opening 16 is connected with latting drown container 9 by a hydraulic transmission.
The operating method of this equipment is as follows:
Starting equipment vacuum 12 reaches separate vacuum degree 1Pa～800Pa, and optimal vacuum pressure is 10Pa～500Pa, and the heating medium in the heating unit 5 is heated to 80 ℃～210 ℃, and optimum heating temperature is 100 ℃～190 ℃.Heating medium wherein can be steam or deep fat.
The polyisocyanates material that contains vulcabond in the container 1---can at the preset temperature state---is sent into the thin-film evaporator 4 from opening for feed 2 continuously, be distributed on thin-film evaporator 4 inwalls through distributor 3 effects there, and the movable stirring scratch board 13 that is stirred on the main shaft 20 spreads to film, because viscosity is lower, material can be spread to relatively thin film by movable stirring scratch board 13, and vulcabond is overflowed under heating and vacuum.Effusion along with vulcabond, the viscosity of material increases gradually, when reaching a point among Fig. 2, the viscosity of material is bigger, movable stirring scratch board can not spread to film with it, at this moment the movable stirring scratch board that stirs on the main shaft 20 has become fixing straight stirring scratch board 14, fixing straight stirring scratch board can continue to keep material to become film, when material reaches b point among Fig. 2, material viscosity further increases, material can be scraped be that film, material have been difficult to flow downward under the effect of gravity though at this moment fix straight stirring scratch board, at this moment, the fixing straight stirring scratch board that stirs on the main shaft 20 becomes fixedly helical stir scraper plate, when fixedly the helical stir scraper plate further forms thinner film with material, keep a downward thrust to material, the material of final separator well is discharged through discharge opening 16.Discharge opening 16 connects latting drown container 9 by hydraulic transmission.Put into letdown solvent dun in the latting drown container in advance, the polyisocyanates of separation that latting drown enters, the material of discharge enter latting drown container 9 and carry out latting drown.Can obtain the polyisocyanates affixture of low free monomer this moment.
Form in the process of different thickness film by thin-film evaporator 4 at material, constantly the vulcabond of overflowing forms secondary steam, secondary steam can be nearby by upper outlet 6, export 7 and 8 down and overflow, secondary steam outlet 6,7 are connected a refrigerating heat exchanger 10 with 8, with the secondary steam of cooling evaporation.Being provided with of multiple exit reduced the again condensation of secondary steam in thin-film evaporator 4, and secondary steam arrives heat exchanger 10, collects after the condensation in the secondary steam receiving vessel 11.The other end of heat exchanger 10 connects vacuum apparatus 12 by secondary steam collection container 11, so that the effusion of secondary steam and collection.
Be two concrete production examples below.
Embodiment 1
The TDI-TMP affixture (being preheating to 100 ℃) that will contain 20% free TDI passes through film processing device continuously, wherein the separating area of thin-film evaporator is 0.5 square metre, stir the main shaft movable stirring scratch board of band, fixing straight stirring scratch board and fixing helical stir scraper plate from top to bottom, adopt two outlets of hypomere, outlet of epimere, thin film wire speed is 8m/s, 180 ℃ of separation temperatures, separate vacuum 230Pa, per hour treatment capacity is 47kg, separates after fixing agent index and sees the following form:
| Index | Value |
| Color and luster (Pt-Co colorimetric), number | 20 |
| Outward appearance | Transparent |
| Non-volatile part, % | 74.7 |
| Free TDI content, % | 0.231 |
| NCO content, % | 12.9 |
| Viscosity, mPa.s | 1270 |
Embodiment 2
The TDI-TMP affixture (being preheating to 100 ℃) that will contain 20% free TDI passes through film processing device continuously, wherein the separating area of thin-film evaporator is 2 square metres, stir the main shaft movable stirring scratch board of band, straight stirring scratch board and helical stir scraper plate from top to bottom, adopt outlet of hypomere, two outlets of epimere, thin film wire speed is 8.4m/s, 180 ℃ of separation temperatures, separate vacuum 238Pa, per hour treatment capacity is 184kg, separates after fixing agent index and sees the following form:
| Index | Value |
| Color and luster (Pt-Co colorimetric), number | 20 |
| Outward appearance | Transparent |
| Non-volatile part, % | 75.1 |
| Free TDI content, % | 0.242 |
| NCO content, % | 13 |
| Viscosity, mPa.s | 1350 |
Claims (10)
1. film processing device that separates the polyurethane adducts free monomers, comprise thin-film evaporator (4), be provided with in the thin-film evaporator and stir main shaft (20), stir main shaft and be provided with stirring scratch board, thin-film evaporator is provided with opening for feed (2), secondary steam outlet and discharge opening (16), it is characterized in that described stirring main shaft is provided with movable stirring scratch board (13) and fixing straight stirring scratch board (14), or movable stirring scratch board (13) and fixing helical stir scraper plate (15), or fixing straight stirring scratch board and fixing helical stir scraper plate, or movable stirring scratch board, fixing straight stirring scratch board and fixing helical stir scraper plate; Thin-film evaporator is provided with two and above secondary steam outlet.
2. the film processing device of separation polyurethane adducts free monomers according to claim 1, it is characterized in that described movable stirring scratch board (13) is hinged on the stirring main shaft (20), along stirring main shaft radial arrangement two to eight row, every row are provided with one deck and above movable stirring scratch board.
3. the film processing device of separation polyurethane adducts free monomers according to claim 1, it is characterized in that described fixing straight stirring scratch board (14) is fixed on the stirring main shaft (20), along stirring main shaft radial arrangement two to eight row, whenever classify the fixing straight stirring scratch board of monolithic as.
4. the film processing device of separation polyurethane adducts free monomers according to claim 1, it is characterized in that described fixedly helical stir scraper plate (15) in the shape of a spiral structure be fixed in and stir on the main shaft (20), stir main shaft (20) and be provided with two to eight fixedly helical stir scraper plates.
5. the film processing device of separation polyurethane adducts free monomers according to claim 1, it is characterized in that described movable stirring scratch board (13) and/or fixing straight stirring scratch board (14) and/or fixedly helical stir scraper plate (15) join successively.
6. the film processing device of separation polyurethane adducts free monomers according to claim 1 is characterized in that described secondary steam outlet is arranged on thin-film evaporator (4) epimere and/or hypomere, and number is two to eight.
7. the film processing device of separation polyurethane adducts free monomers according to claim 6 is characterized in that described secondary steam outlet has three, and the epimere place is provided with one in thin-film evaporator (4), has two in the thin-film evaporator lower section.
8. the film processing device of separation polyurethane adducts free monomers according to claim 6 is characterized in that the outlet of described thin-film evaporator (4) secondary steam is connected with heat exchanger (10); Heat exchanger (10) joins with secondary steam collection container (11), vacuum apparatus (12) successively.
9. the film processing device of separation polyurethane adducts free monomers according to claim 1, it is characterized in that described thin-film evaporator (4) locates to be provided with distributor (3) in opening for feed (2), distributor and stir main shaft (20) and stirring scratch board concentric.
10. the film processing device of separation polyurethane adducts free monomers according to claim 1 is characterized in that described thin-film evaporator (4) is provided with heating unit (5) on every side; Discharge opening (16) is connected with latting drown container (9) by a hydraulic transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520067999 CN2878389Y (en) | 2005-11-29 | 2005-11-29 | Thin film processing device for separating dissociative monomer in polyurethane addition compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520067999 CN2878389Y (en) | 2005-11-29 | 2005-11-29 | Thin film processing device for separating dissociative monomer in polyurethane addition compound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2878389Y true CN2878389Y (en) | 2007-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520067999 Expired - Lifetime CN2878389Y (en) | 2005-11-29 | 2005-11-29 | Thin film processing device for separating dissociative monomer in polyurethane addition compound |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2878389Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391569C (en) * | 2005-11-29 | 2008-06-04 | 广东华润涂料有限公司 | Diaphragm treatment equipment for removing free monomer of additive compound of polyurethane |
| CN103120858A (en) * | 2013-02-27 | 2013-05-29 | 常熟市龙宇化工设备有限公司 | Falling film scraper type multi-pipe evaporation and concentration device |
-
2005
- 2005-11-29 CN CN 200520067999 patent/CN2878389Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391569C (en) * | 2005-11-29 | 2008-06-04 | 广东华润涂料有限公司 | Diaphragm treatment equipment for removing free monomer of additive compound of polyurethane |
| CN103120858A (en) * | 2013-02-27 | 2013-05-29 | 常熟市龙宇化工设备有限公司 | Falling film scraper type multi-pipe evaporation and concentration device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080604 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |