CN110605797A - Recovery device and recovery process for preparing supporting base film for supporting-free film - Google Patents
Recovery device and recovery process for preparing supporting base film for supporting-free film Download PDFInfo
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- CN110605797A CN110605797A CN201910983001.5A CN201910983001A CN110605797A CN 110605797 A CN110605797 A CN 110605797A CN 201910983001 A CN201910983001 A CN 201910983001A CN 110605797 A CN110605797 A CN 110605797A
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- 238000011084 recovery Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 159
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 238000001035 drying Methods 0.000 claims abstract description 31
- 239000002904 solvent Substances 0.000 claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 30
- 238000004064 recycling Methods 0.000 claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims description 37
- 230000003746 surface roughness Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000008215 water for injection Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000011160 research Methods 0.000 abstract description 3
- 210000004379 membrane Anatomy 0.000 description 36
- 229920000139 polyethylene terephthalate Polymers 0.000 description 17
- 239000005020 polyethylene terephthalate Substances 0.000 description 17
- 238000005070 sampling Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 210000002469 basement membrane Anatomy 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229920005597 polymer membrane Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/022—Cleaning travelling work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/041—Cleaning travelling work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H18/00—Winding webs
- B65H18/08—Web-winding mechanisms
- B65H18/10—Mechanisms in which power is applied to web-roll spindle
- B65H18/103—Reel-to-reel type web winding and unwinding mechanisms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/24—AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0015—Washing, rinsing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention provides a recovery device for preparing a supporting base film for an unsupported film, which can solve the technical problems that a large amount of supporting base films are required to be used when the unsupported film is prepared at present, the production cost is high, and domestic research on recycling of the supporting base films is relatively few. The device comprises an unwinding device, three groups of driving wheels and a winding device which are sequentially arranged, wherein a supporting base film is discharged from the unwinding device and is wound by the winding device after sequentially passing around the three groups of driving wheels, and a second group of driving wheels are rough roller wheels; the lower roller of each group of driving wheels is immersed in the corresponding water tank, pure water is filled in the water tanks at two sides, and a solvent is filled in the water tank in the middle; a pure water spraying device is arranged above the first group of driving wheels, and an online roughness detection device, an online deformation detection device and a drying device are sequentially arranged between the third water tank and the winding device. Meanwhile, the invention also provides a recovery process of the supporting base film.
Description
Technical Field
The invention relates to the field of processing of unsupported membranes, in particular to a recovery device and a recovery process for preparing a supported base membrane for an unsupported membrane.
Background
The filtration membrane can be classified into a supported membrane and an unsupported membrane according to the presence or absence of a support layer. In general, the support layer in the supported membrane refers to a porous membrane for supporting a dense membrane, and the pore size of the porous membrane is inversely proportional to the pressure during membrane formation so as to prevent the dense membrane from being pressed through. Support layers used in industrial production are all reinforced with textile fibres, such as non-woven fabrics or fibre fabrics. The key part for realizing the separation function in the supported membrane is the compact membrane, so that the selective separation among all components is realized, the supporting layer mainly plays a role in supporting the compact membrane, the overall strength and the practicability of a membrane product are enhanced, and no substantial effect is brought to the filtration efficiency of the membrane. Although the unsupported membrane has no supporting layer after membrane formation, in the membrane preparation process, a nonporous material such as PET (polyethylene terephthalate) is required to be used as a supporting base membrane before the forming of the high polymer membrane material, the supporting base membrane does not participate in membrane formation and is only used as a membrane formation carrier, and the supporting base membrane and the membrane formation are required to be peeled after the forming of the high polymer membrane material. In actual production, the supporting base film is only used as a carrier for film formation, but the using amount is about 1.2 times of that of a film product, and accounts for about 10% of the production cost. At present, domestic research on recycling of the supporting base film is relatively few, and development of a recycling device and a recycling process of the supporting base film has important significance for reducing the production cost of the supporting-free film and saving energy and protecting environment.
Disclosure of Invention
Aiming at the technical problems that a large amount of supporting base films are needed to be used when the unsupported membranes are prepared at present, the production cost is high, and domestic research on recycling of the supporting base films is relatively few, the invention provides a recycling device for preparing the supporting base films for the unsupported membranes, which can effectively recycle the supporting base films, greatly reduce the production cost of the unsupported membranes, save energy and protect environment, and simultaneously provides a recycling process for preparing the supporting base films for the unsupported membranes.
The technical scheme is as follows:
the utility model provides a recovery unit of preparation unsupported membrane with supporting base film which characterized in that: the device comprises an unwinding device, three groups of driving wheels and a winding device which are sequentially arranged, wherein a support base film to be recovered is discharged from the unwinding device, sequentially bypasses the three groups of driving wheels and then is wound by the winding device, and the second group of driving wheels are rough roller wheels; the lower roller of each group of driving wheels is immersed in the corresponding water tank, pure water is filled in the water tanks at two sides, and a solvent is filled in the water tank in the middle; and a pure water spraying device is arranged above the first group of driving wheels, and a roughness online detection device, a deformation online detection device and a drying device are sequentially arranged between the water tank and the winding device.
It is further characterized in that:
be located adjacent two between the basin support base film top and third the basin with between the roughness on-line measuring device the support base film top is provided with compressed air respectively and blows and drench the device, is located the second basin and third between the basin support base film top still is provided with pure water spray set, compressed air blows and drenches device and second pure water spray set's below all is provided with the catch basin for collect by the liquid that drips on the support base film.
And the inner walls of the water tanks are respectively provided with a conductivity detection device, and the conductivity detection devices are immersed in the corresponding water tanks.
The water tank is also provided with a circulating pump, the circulating pump is arranged on the water pipe, the water inlet end and the water outlet end of the water pipe are both immersed in the water tank, and the water inlet end is higher than the water outlet end.
And a deviation correcting device is also arranged between the drying device and the winding device and is used for correcting the side edge error of the supporting base film in the forward movement.
A recovery process for preparing a supporting base film for an unsupported film is characterized by comprising the following steps: the recovery device is used for recovering the supporting base film, and specifically comprises the following steps:
step 1, realizing stable transmission of a supporting base film by using the unreeling device, the driving wheel and the reeling device;
step 2, in the transmission process, firstly using the pure water spraying device to wash the supporting base film and soaking the supporting base film by using pure water in the first water tank to preliminarily remove obvious residues on the surface of the supporting base film;
step 3, soaking the supporting base film by using a solvent in a second water tank, wherein the solvent is used for loosening residues adhered to the surface of the supporting base film, washing the surface of the supporting base film by using the hair roller wheel, and stripping the residues adhered to the surface of the supporting base film;
step 4, soaking the supporting base film by using pure water in a third water tank, and further removing residues and solvents on the surface of the supporting base film;
and 5, respectively detecting the surface roughness and the thickness of the supporting base film on line by using the roughness online detection device and the deformation online detection device, drying the supporting base film by using the drying device, and finally winding by using the winding device to complete the recovery of the supporting base film.
It is further characterized in that:
the method also comprises the off-line spot check of the surface roughness, the thickness and the width, wherein the proportion of the off-line spot check is 1 percent, the equipment used for the off-line spot check of the surface roughness is an atomic force microscope, and the deviation of the surface roughness of the recovered supporting base film and the theoretical supporting base film is qualified within the range of +/-10 percent; the thickness gauge and the ruler are respectively used for offline spot inspection of the thickness and the width, and the thickness and width deviation of the recovered supporting base film and the theoretical supporting base film is qualified within the range of +/-5%.
The pure water in the water tank and the water for the pure water spray device can be distilled water, purified water or water for injection, the temperature of the pure water in the water tank is 20 ℃ ~ 70 ℃, and the temperature of the solvent is 10 ℃ ~ 70 ℃.
The drying device is a blowing drying device, and simultaneously blows air to the upper side and the lower side of the supporting base film for drying, and clean hot air at 40 ℃ and ~ 60 ℃ is provided.
The winding speed of the winding device is 1m/s ~ 10 m/s.
The invention has the beneficial effects that:
the supporting base film recovery device is provided with the unreeling device, the three groups of driving wheels and the reeling device, can realize stable transmission of the supporting base film, and is also provided with three water tanks, a pure water spraying device, a roughness online detection device, a deformation online detection device and a drying device, wherein pure water, a solvent and pure water are respectively filled in the three water tanks, the supporting base film in the transmission process can be sequentially washed by water, the solvent and water, the performance of the supporting base film is verified by the roughness online detection device and the deformation online detection device after being washed, the performance of the recovered supporting base film is effectively ensured to meet the use requirement, and the recovery of the supporting base film is finished after being dried and reeled, so that the device has reasonable structural design, can realize high-efficiency recovery and utilization of the supporting base film, thereby greatly reducing the production cost, reducing the pollution risk of the discarded supporting base film to the, the device has high degree of mechanization and convenient and efficient use;
according to the supporting base film recycling method, the supporting base film in the transmission process is sequentially subjected to primary cleaning, residue stripping, final cleaning, surface roughness detection, thickness detection, drying and rolling, the process flow is simplified and efficient, the residues on the surface of the supporting base film can be effectively removed, the efficient recycling of the supporting base film is realized, the production and use cost of the supporting base film is reduced, the pollution risk of the waste supporting base film to the environment is reduced, and the method is energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic structural diagram of a recycling apparatus of the present invention.
Reference numerals: 1-an unwinding device; 2, a winding device; 3-supporting the base film; 4-a water tank; 5-rolling the lower roller; 6-rolling the upper roller; 7-a pure water spray device; 8-roughness online detection device; 9-deformation online detection device; 10-a drying device; 11-compressed air shower device; 12-a water collection tray; 13-conductivity detection means; 14-a circulation pump; 15-a water pipe; 16-water inlet end; 17-water outlet end; 18-deviation correcting device.
Detailed Description
Referring to fig. 1, the recovery device for preparing a supporting base film for an unsupported film of the invention comprises an unwinding device 1, three groups of driving wheels and a winding device 2 which are sequentially arranged, a supporting base film 3 to be recovered is discharged from the unwinding device 1 and is wound by the winding device 2 after sequentially bypassing the three groups of driving wheels, the second group of driving wheels are rough rollers, the first group of driving wheels and the third group of driving wheels can be common driving wheels, the driving wheels can be power wheels or unpowered wheels, and when the power wheels are adopted, the rotating speed of the driving wheels is synchronous with the winding and unwinding speed; the film casting device is characterized by further comprising three water tanks 4 which are arranged in one-to-one correspondence with the three groups of driving wheels, wherein the lower roller 5 in each group of driving wheels is immersed in the corresponding water tank 4, the upper roller 6 is positioned above the liquid level of the water tank 4, pure water is filled in the water tanks 4 on the two sides, a solvent is filled in the middle water tank 4, the solvent is selected according to the components of a film casting solution used in the preparation of the unsupported membrane, and the solvent can dissolve residues of the supported base membrane, is easy to dissolve in water and cannot damage the supported base membrane; a pure water spraying device 7 is arranged above the first group of transmission wheels, and an online roughness detection device 8, an online deformation amount detection device 9 and a drying device 10 are sequentially arranged between the third water tank 4 and the winding device 2; a compressed air spray device 11 is respectively arranged above the supporting base film 3 between two adjacent water tanks 4 and above the supporting base film 4 between the third water tank 4 and the roughness online detection device 8, a pure water spray device 7 is also arranged above the supporting base film 3 between the second water tank 4 and the third water tank 4, water collecting trays 12 are respectively arranged below the compressed air spray device 11 and the second pure water spray device 7, the water collecting trays 12 are used for collecting liquid dripped from the supporting base film 3, and the water collecting trays 12 have a water drainage function; the compressed air blowing and spraying device 11 is used for blowing and spraying clean air on the surface of the supporting base film 3 leaving the water tank 4, so that partial residues on the supporting base film 3 can be further removed; the second pure water spray device 7 is arranged to spray off a part of the solvent on the support base film 3 to reduce the concentration of the solvent in the third water tank 4.
The pure water spraying device 7, the compressed air blowing and spraying device 11, the roughness online detection device 8, the deformation online detection device 9 and the drying device 10 belong to the prior art, and the pure water spraying device can adjust the spraying flow rate and pressure through a control valve; the compressed air spray device can adjust the spray flow rate and pressure through a control valve; the roughness online detection device can select Alicona IF-Sensor series products; the deformation online detection device can select an ultrasonic online thickness gauge; the drying device can be selected from air-floating type oven of Wu Te industrial equipment limited company without tin.
Referring to fig. 1, conductivity detection devices 13 are further respectively mounted on the inner walls of the water tanks 4, the conductivity detection devices 13 are immersed in the corresponding water tanks 4, the conductivity detection devices can detect conductivity changes of pure water and a solvent in real time, and indirectly reflect changes of impurities in the water tanks, and the more impurities in the water tanks, the higher the conductivity of the liquid.
Referring to fig. 1, the water tank 4 is further provided with a circulating pump 14, the circulating pump 14 is installed on a water pipe 15, a water inlet end 16 and a water outlet end 17 of the water pipe 15 are both immersed in the water tank, and the water inlet end 16 is higher than the water outlet end 17. By the design, the liquid in the water tank can flow, and the supporting base film is better cleaned.
Referring to fig. 1, a deviation correcting device 18 is further disposed between the drying device 10 and the winding device 2, and the deviation correcting device 18 is used for correcting a side error of the supporting base film in the forward movement. Deviation correcting device belongs to prior art, and deviation correcting device's setting can ensure to support the base film and transmit on correct track.
Referring to fig. 1, the recycling process of the supporting base film for preparing the unsupported film of the invention is to recycle the supporting base film by using the recycling device of the invention, and specifically comprises the following steps:
step 1, realizing stable transmission of a supporting base film 3 by using an unreeling device 1, a driving wheel and a reeling device 2;
step 2, in the transmission process, firstly washing the supporting base film 3 by using a pure water spraying device 7 and soaking the supporting base film 3 by using pure water in a first water tank 4 to primarily remove obvious residues on the surface of the supporting base film 3, wherein the pure water in the water tank 4 and the pure water used by the pure water spraying device 7 can be distilled water, purified water or water for injection, and the temperature of the pure water in the water tank 4 is ~ 70 ℃ at 20 ℃;
step 3, soaking the supporting base film 3 by using a solvent in a second water tank 4, wherein the solvent is used for loosening residues adhered to the surface of the supporting base film, simultaneously washing the surface of the supporting base film by using a hair roller, and stripping the residues adhered to the surface of the supporting base film 3, and the temperature of the solvent is 10 ℃ ~ 70 ℃;
step 4, soaking the supporting base film 3 by using pure water in a third water tank 4, further removing residues and solvents on the surface of the supporting base film 3, wherein the pure water in the water tank 4 can be distilled water, purified water or water for injection, the water temperature of the pure water in the water tank 4 is 20 ℃ and ~ 70 ℃, the supporting base film 3 is blown by a compressed air blowing and sprinkling device 11 after leaving the water tank 4 each time, and is also sprayed by a pure water spraying device 7 after leaving the water tank 4 filled with the solvents;
and 5, respectively detecting the surface roughness and the thickness of the supporting base film 3 on line by using a roughness online detection device 8 and a deformation online detection device 9, drying the supporting base film 3 by using a drying device 10, and finally, winding the supporting base film 3 by using a winding device 2 to complete recovery of the supporting base film 3, wherein the drying device 10 is a blast drying device and simultaneously performs blast drying on the upper side and the lower side of the supporting base film 3 to provide clean hot air at 40 ℃ of ~ 60 ℃, and the winding speed of the winding device 2 is 1m/s ~ 10 m/s.
In addition to 100% online detection of the surface roughness and thickness of the supporting base film, in order to further ensure that the recovered supporting base film meets the use requirements, the method further comprises the step of offline sampling detection of the surface roughness, the thickness and the width, wherein the proportion of the offline sampling detection is 1%, equipment used for the offline sampling detection of the surface roughness is an atomic force microscope, a thickness gauge and a ruler are respectively used for the offline sampling detection of the thickness and the width, no matter the online detection or the sampling detection is carried out, the deviation of the surface roughness of the recovered supporting base film and the theoretical supporting base film is qualified within the range of +/-10%, and the deviation of the thickness and the width is qualified within the range of +/-5%.
The following is a detailed description of several specific embodiments.
Example 1
The components of the original casting solution are NMP, PES, DEG and PVP, the supporting base film is PET, the thickness of the supporting base film is 40 mu m, and the surface roughness is 0.040 mu m. The attachments on the PET supporting base membrane subjected to phase inversion film forming comprise water, NMP, PES, DEG, PVP and the like. Sampling and detecting, wherein NMP 400ppm, PES 120ppm, DEG 151ppm and PVP 6ppm remain on the upper surface of the PET supporting base film. The PET supporting base film is recovered by the recovery method, the pure water used for recovery is ultrapure water, the solvent is NMP, the temperature of the pure water is 20 ℃, the temperature of the solvent is 10 ℃, the drying temperature is 40 ℃, and the winding and unwinding speed is 10 m/s. The thickness of the supporting base film is 40 μm and the surface roughness is 0.042 μm by on-line detection. Through detection, NMP 6ppm, PES 1ppm, DEG1ppm and PVP remained on the surface of the recycled PET supporting base film are not detected. The PES film forming is not obviously affected when the PES film is used for the second time.
Example 2
The components of the original casting solution are NMP, PES, TEG and PVP, the support base film is PET, the thickness of the support base film is 38 mu m, and the surface roughness is 0.040 mu m. The attachments on the PET supporting base membrane subjected to phase inversion film forming comprise water, NMP, PES, TEG, PVP and the like. Sampling and detecting, wherein NMP 368ppm, PES 124ppm, TEG 123ppm and PVP 5ppm remain on the surface of the PET supporting base film. The PET supporting base film is recycled by the recycling method, the pure water is distilled water, and the solvent is NMP. The temperature of pure water is 45 ℃, the temperature of solvent is 40 ℃, the drying temperature is 50 ℃, and the winding and unwinding speed is 5.5 m/s. The thickness of the supporting basement membrane is 38 mu m by on-line detection, and the surface roughness is 0.041 mu m. Through detection, NMP 6ppm, PES 1ppm, TEG 1ppm and PVP remained on the surface of the recycled PET supporting base film are not detected. The PES film forming is not obviously affected when the PES film is used for the second time.
Example 3
The components of the raw casting solution are DMAc, PES and PVP, the supporting base film is PET, the thickness of the supporting base film is 50 mu m, and the surface roughness is 0.053 mu m. The attachments on the PET supporting basement membrane after the phase inversion film forming comprise water, DMAc, PES, PVP and the like. Sampling and detecting, wherein 426ppm of DMAc, 138ppm of PES and 8ppm of PVP are remained on the surface of the PET supporting basement membrane. The PET supporting base film is recycled by adopting the recycling method, the used water is water for injection, and the solvent is DMAc. The washing temperature is 70 ℃, the solvent temperature is 70 ℃, the drying temperature is 60 ℃, and the winding and unwinding speed is 1 m/s. The thickness of the supporting basement membrane is 50 mu m and the surface roughness is 0.052 mu m through on-line detection. Through detection, 4ppm of residual DMAc, 1ppm of PES and undetected PVP on the surface of the recycled PET supporting basement membrane are detected. The PES film forming is not obviously affected when the PES film is used for the second time.
Claims (10)
1. The utility model provides a recovery unit of preparation unsupported membrane with supporting base film which characterized in that: the device comprises an unwinding device, three groups of driving wheels and a winding device which are sequentially arranged, wherein a support base film to be recovered is discharged from the unwinding device, sequentially bypasses the three groups of driving wheels and then is wound by the winding device, and the second group of driving wheels are rough roller wheels; the lower roller of each group of driving wheels is immersed in the corresponding water tank, pure water is filled in the water tanks at two sides, and a solvent is filled in the water tank in the middle; and a pure water spraying device is arranged above the first group of driving wheels, and a roughness online detection device, a deformation online detection device and a drying device are sequentially arranged between the water tank and the winding device.
2. The recycling apparatus of claim 1, wherein the recycling apparatus comprises: be located adjacent two between the basin support base film top and third the basin with between the roughness on-line measuring device the support base film top is provided with compressed air respectively and blows and drench the device, is located the second basin and third between the basin support base film top still is provided with pure water spray set, compressed air blows and drenches device and second pure water spray set's below all is provided with the catch basin for collect by the liquid that drips on the support base film.
3. The recycling apparatus of claim 1, wherein the recycling apparatus comprises: and the inner walls of the water tanks are respectively provided with a conductivity detection device, and the conductivity detection devices are immersed in the corresponding water tanks.
4. The recycling apparatus of claim 1, wherein the recycling apparatus comprises: the water tank is also provided with a circulating pump, the circulating pump is arranged on the water pipe, the water inlet end and the water outlet end of the water pipe are both immersed in the water tank, and the water inlet end is higher than the water outlet end.
5. The recycling apparatus of claim 1, wherein the recycling apparatus comprises: and a deviation correcting device is also arranged between the drying device and the winding device and is used for correcting the side edge error of the supporting base film in the forward movement.
6. A recovery process for preparing a supporting base film for an unsupported film is characterized by comprising the following steps: recycling of the supporting base film by means of the recycling device according to any of claims 1 to 5, comprising in particular the following steps:
step 1, realizing stable transmission of a supporting base film by using the unreeling device, the driving wheel and the reeling device;
step 2, in the transmission process, firstly using the pure water spraying device to wash the supporting base film and soaking the supporting base film by using pure water in the first water tank to preliminarily remove obvious residues on the surface of the supporting base film;
step 3, soaking the supporting base film by using a solvent in a second water tank, wherein the solvent is used for loosening residues adhered to the surface of the supporting base film, washing the surface of the supporting base film by using the hair roller wheel, and stripping the residues adhered to the surface of the supporting base film;
step 4, soaking the supporting base film by using pure water in a third water tank, and further removing residues and solvents on the surface of the supporting base film;
and 5, respectively detecting the surface roughness and the thickness of the supporting base film on line by using the roughness online detection device and the deformation online detection device, drying the supporting base film by using the drying device, and finally winding by using the winding device to complete the recovery of the supporting base film.
7. The recycling process of the supporting base film for preparing the unsupported film according to claim 6, wherein: the method also comprises the off-line spot check of the surface roughness, the thickness and the width, wherein the proportion of the off-line spot check is 1 percent, the equipment used for the off-line spot check of the surface roughness is an atomic force microscope, and the deviation of the surface roughness of the recovered supporting base film and the theoretical supporting base film is qualified within the range of +/-10 percent; the thickness gauge and the ruler are respectively used for offline spot inspection of the thickness and the width, and the thickness and width deviation of the recovered supporting base film and the theoretical supporting base film is qualified within the range of +/-5%.
8. The process of claim 6, wherein the pure water in the water tank and the water for the pure water spray device are distilled water, purified water or water for injection, the temperature of the pure water in the water tank is 20 ℃ ~ 70 ℃, and the temperature of the solvent is 10 ℃ ~ 70 ℃.
9. The recycling process of supporting base film for preparing unsupported film according to claim 6, wherein the drying device is an air-blowing drying device, and the air-blowing drying device is used for simultaneously air-blowing drying the upper and lower sides of the supporting base film to provide clean hot air of 40 ℃ ~ 60 ℃.
10. The recycling process of supporting base film for preparing unsupported film according to claim 6, wherein the take-up speed of the take-up device is 1m/s ~ 10 m/s.
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