CN111905569B - Continuous manufacturing method of partition board for electrodialysis membrane stack - Google Patents
Continuous manufacturing method of partition board for electrodialysis membrane stack Download PDFInfo
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- CN111905569B CN111905569B CN202010828134.8A CN202010828134A CN111905569B CN 111905569 B CN111905569 B CN 111905569B CN 202010828134 A CN202010828134 A CN 202010828134A CN 111905569 B CN111905569 B CN 111905569B
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- spraying
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- electrodialysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/50—Stacks of the plate-and-frame type
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
- C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Electrochemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Molecular Biology (AREA)
- Organic Chemistry (AREA)
- Urology & Nephrology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a continuous manufacturing method of a clapboard for an electrodialysis membrane stack, which is a combined net membrane roll that is formed by synchronously laminating a separation net and a release membrane with the same linear velocity into an upper net and a lower membrane; spraying molten rubber material to the combined net film roll in a dot matrix mode according to the set partition plate spraying pattern through a spray head; the sprayed combined net film roll is subjected to primary rolling and shaping, then the release film is peeled off to separate a partition plate, the peeled release film is rolled, and the separated partition plate is subjected to secondary rolling and shaping and then subjected to thickness detection; and cutting the partition board with stable thickness into an electrodialysis partition board. Has the advantages of simple process, high production efficiency, low manufacturing cost and stable product performance.
Description
Technical Field
The invention relates to a continuous manufacturing method of a separator for an electrodialysis membrane stack.
Background
Electrodialysis or capacitance deionization as an electrically driven ionic compound separation technology has been widely applied in the fields of sea water desalination, drinking water treatment, zero emission and the like, but electrodialysis separators are important parts in electrodialysis membrane stacks and are manufactured by blanking and welding pp plates all the time, the manufacturing efficiency is low, more sharp burrs are easy to appear in the product welding process, ion exchange membranes are easy to damage in the assembling process, the problems that pressure sealing membrane stacks of hundreds of separators are deformed and the like, the membrane stack performance is deteriorated, and the operation process is unstable and the like are caused. The electrodialysis partition plate also adopts a thermoplastic plastic sheet and a flow guide partition net for hot-pressing manufacturing, but has the problems of low production efficiency, cooling and warping of the partition plate after hot pressing and the like, and the normal assembly of the electrodialysis membrane stack is hindered.
Disclosure of Invention
The invention aims to solve the problems and provides a continuous manufacturing method of a separator for an electrodialysis membrane stack, which has the advantages of simple process, high production efficiency, low manufacturing cost and stable product performance.
The object of the present invention is achieved by a method for continuously producing a separator for an electrodialysis membrane stack, comprising:
1) the combined net film roll is formed by synchronously laminating the separation net and the release film with the same linear speed into an upper net film roll and a lower net film roll;
2) the combined net film roll is subjected to dot-matrix spraying by adopting molten glue through a spray head according to a set partition plate spraying pattern, the partition net has the main functions of providing a flow channel in an electrodialysis film stack, thinning a diffusion layer, improving the performance of the film stack and isolating a negative film and a positive film, the dot-matrix spraying has a good partition plate forming effect on the partition net with the thickness of 0.1-3mm, and meanwhile, the dot-matrix spraying has good wrapping performance after the partition net with the thickness of 0.1-3mm is rolled, and a sealed failure channel with an obvious surface cannot be formed;
3) the sprayed combined net film roll is subjected to primary rolling and shaping, then the release film is peeled off to separate a partition plate, the peeled release film is rolled, and the separated partition plate is subjected to secondary rolling and shaping and then subjected to thickness detection;
4) and cutting the partition board with stable thickness into an electrodialysis partition board.
According to the invention, the set partition plate spraying graph determines a spraying area according to the shapes and sizes of the runners of different electrodialysis partition plates, and the partition plate sealing frame is sprayed out of the spraying area.
According to the invention, the dot-matrix spraying of the combined net film roll adopts the spraying holes with the nozzles arranged in a dot-matrix manner for spraying.
According to the invention, the cut electrodialysis partition plate is punched with a liquid collecting hole and a water distribution flow channel according to the requirements of a membrane stack.
The separation net is one or more of an extrusion net, a woven net and a punching net, and the whole thickness is 0.1-3mm, and the preferable thickness is 0.5-1 mm.
According to the invention, the gap width tolerance of each rolling and shaping group of the primary rolling and shaping and the secondary rolling and shaping is controlled within +/-0.02 mm, so that the separator has good tolerance, and the reliability of assembly of hundreds of electrodialysis separator film stacks is ensured.
According to the invention, the melt index of the plastic adopted by the molten rubber material is 50-1500, and the molten rubber material has good spraying performance in the spraying process, so that the spraying is uniform; if the melt index is too low, the problems of over-high spraying pressure, unsmooth spraying, poor leveling effect, over-high melt index, unstable spraying amount, leveling pattern deformation, glue shortage and the like are easily caused.
According to the invention, the spraying frequency of the molten rubber material for spraying the combined net film roll according to the set partition plate spraying pattern through the spray head is adapted to the linear speed of the combined net film roll.
According to the invention, the rolling shaping of the primary rolling shaping and the secondary rolling shaping is realized by combining a sizing material and a spacer screen into a partition plate through physical change or chemical change. When the physical change is thermoplastic plastic, heating and melting the sizing material for spraying, and rolling, shaping and cooling to form the partition plate; the chemical change refers to that the prepolymerized plastic with a certain melt index reacts to form plastic with higher molecular weight after being rolled and shaped, so that the partition plate has higher use temperature and mechanical property.
According to the invention, if the whole surface sizing material is adopted for spraying, warping deformation in the rolling process is easily caused, so that lattice type spraying is adopted, spraying area gaps exist in a spraying area to form spaced spraying glue points, and in the rolling process, spraying area gaps between spraying lattices can be filled with rolled molten sizing material fluid to form an integrated sizing material coating sealing surface of the partition net, rolling deformation and stretching caused by excessive molten sizing material are avoided, the problems of tolerance and warping deformation of the partition board are effectively solved, and burrs generated in welding the partition board are fundamentally eliminated; in addition, the dot-matrix spraying can be flexibly adjusted according to the overall dimension of the flow channel required by the partition plate, and the partition plates with different flow channels are manufactured. The lattice type spraying can continuously produce coiled separators and continuously manufacture electrodialysis separators, so that the production efficiency is greatly improved.
Detailed Description
The present invention provides a method for continuously producing a separator for an electrodialysis membrane stack, comprising:
1) the combined net film roll is formed by synchronously laminating a separation net and a release film with the same linear velocity into an upper net and a lower film, wherein the separation net is one or more of an extrusion net, a woven net and a punching net;
2) the combined net film roll is subjected to dot-matrix spraying by adopting molten glue through a spray head according to a set partition plate spraying pattern, the partition net has the main functions of providing a flow channel in an electrodialysis film stack, thinning a diffusion layer, improving the performance of the film stack and isolating a negative film and a positive film, the dot-matrix spraying has a good partition plate forming effect on the partition net with the thickness of 0.1-3mm, and meanwhile, the dot-matrix spraying has good wrapping performance after the partition net with the thickness of 0.1-3mm is rolled, and a sealed failure channel with an obvious surface cannot be formed;
3) the sprayed combined net film roll is subjected to primary rolling and shaping, then the release film is peeled off to separate a partition plate, the peeled release film is rolled, and the separated partition plate is subjected to secondary rolling and shaping and then subjected to thickness detection;
4) and cutting the partition board with stable thickness into an electrodialysis partition board, and punching a liquid collecting hole and a water distribution flow channel by the electrodialysis partition board according to the requirements of the membrane stack.
The following are 4 electrodialysis separators produced by a continuous production method for electrodialysis membrane stack separators and the membrane stack effect:
example 1
Adopting a Deltar 3011 extrusion net with the width of 650mm, the average thickness of the extrusion net is 0.75mm, the spraying partition plate is an outer frame with a frame 1110 x 550mm, the internal non-spraying area is 970 x 490mm, the internal non-spraying area is centered, the rest part is a spraying area, the spraying glue is EVA, the VA content of the spraying glue is 17% by mass, the melt index is 300, the area ratio of a dot matrix in the spraying area to the area of the spraying area is 0.8:1, the volume ratio of the spraying volume of the molten plastic to the volume ratio of the partition net in the area to be sprayed is 0.95 times, the linear speed of the partition net corresponding to the spraying frequency is 15m/min, the minimum width of a rolling crack is 0.74mm, and 15 ten thousand partition plates produced every year can be realized; the thickness tolerance of the obtained partition board is +/-0.015 mm, the sealing surface is smooth, 300 pairs of membrane stacks are assembled by adopting a membrane with the thickness of 0.5mm, the static pressure difference of a water column of 1m exists in a concentrated and diluted water chamber, the internal leakage is less than 3% within 2 hours, and the membrane stacks have no external leakage.
Example 2
Adopting a delta 2016 extrusion net with the width of 650mm, the average thickness of the net is 0.5mm, the spraying partition plate is an outer frame with a frame of 1110 x 550mm, the internal non-spraying area of the spraying partition plate is 970 x 490mm, the internal non-spraying area of the spraying partition plate is centered, the rest part of the spraying partition plate is a spraying area, the spraying glue material is EVA, the VA content of the EVA is 17% by mass, the melt index of the EVA is 300, the area ratio of a dot array area to the spraying area in the spraying area is 0.7:1, the spraying volume of the molten plastic is 0.90 times of the volume ratio of the partition plate in the area to be sprayed, the linear speed of the partition plate corresponding to the spraying frequency is 15m/min, the minimum width of a rolling crack is 0.48mm, and the annual production of 15 ten thousand partition plates can be realized; the thickness tolerance of the obtained separator is +/-0.015 mm, the sealing surface is smooth, the thickness of the sealing surface is 0.48-0.5, the thickness of the partition net part is 0.5-0.51, a membrane with the thickness of 0.5mm is adopted to assemble 300 pairs of membrane stacks, the water concentration chamber has the static pressure difference of a water column of 1m, the internal leakage is less than 3% within 2 hours, and the membrane stacks do not leak outside.
Example 3
The PET woven mesh with the width of 0.4 wire diameter, 10 wires per inch and the average thickness of 0.8mm is adopted, the width is 70mm, the spraying partition plate is an outer frame with a frame of 1110 mm and 550mm, the inner non-spraying area is 970 mm and 490mm, the inner non-spraying area is centered, the rest part is a spraying area, the spraying glue material is EVA, the VA content is 20% by mass, the melt index is 350, the area ratio of the dot matrix area to the spraying area in the spraying area is 0.8:1, the spraying volume of the molten plastic is 1.2 times of the volume ratio of the partition net in the spraying area, the linear velocity of the partition net corresponding to the spraying frequency is 8m/min, the minimum width of the rolling crack is 0.8mm, and 8 ten thousand partition plates can be produced annually; the thickness tolerance of the obtained partition board is +/-0.01 mm, the sealing surface is smooth, the thickness of the sealing surface is 0.8-0.82, the thickness of the partition net part is 0.8-0.0.82, 300 pairs of membrane stacks are assembled by adopting membranes with the thickness of 0.5mm, the concentration and dilution water chamber has the static pressure difference of a water column of 1m, the internal leakage is less than 2% within 2 hours, and the membrane stacks have no external leakage.
Example 4
Adopting a delta 2016 extrusion net with the width of 650mm, the average thickness of the net is 0.5mm, a spraying partition plate is an outer frame with a frame of 1110 x 550mm, an internal non-spraying area is 970 x 490mm, the internal non-spraying area is centered, the rest part is a spraying area, double-layer partition nets are sprayed, the spraying sizing material is EVA, the VA content of the EVA is 17 percent by mass, the melt index is 300, the area ratio of a dot array area to the spraying area in the spraying area is 0.9:1, the spraying volume of molten plastic is 0.95 times of the volume ratio of the partition nets in the area to be sprayed, the linear speed of the partition nets corresponding to the spraying frequency is 15m/min, the minimum width of a rolling crack is 0.95mm, and 15 ten thousand partition plates can be produced annually; the thickness tolerance of the obtained separator is +/-0.015 mm, the sealing surface is smooth, the thickness of the sealing surface is 0.95-0.98, the thickness of the partition net part is 0.98-1.01, a membrane with the thickness of 0.5mm is adopted to assemble 300 pairs of membrane stacks, the water concentration chamber has the static pressure difference of a water column of 1m, the internal leakage is less than 3% within 2 hours, and the membrane stacks do not leak outside.
The continuous manufacturing of the partition boards can be completed quickly and efficiently in the embodiment, the assembly stability is good, the embodiment 1-3 is spraying of the single-layer partition net, the manufacturing effect is good, the embodiment 3 has a stable manufacturing effect due to the adoption of the thicker woven net, the efficiency is lower than that of other embodiments, but is still higher than that of the existing manual manufacturing, the product performance is more stable, the embodiment 4 adopts the double-layer partition net, and the double-layer net has a better turbulence effect under partial operation conditions.
Claims (7)
1. A method for continuously manufacturing a separator for an electrodialysis membrane stack, comprising: the method comprises the following steps:
1) the combined net film roll is formed by synchronously laminating the separation net and the release film with the same linear speed into an upper net film roll and a lower net film roll;
2) spraying molten rubber material to the combined net film roll in a dot matrix mode through a spray head according to a set partition plate spraying pattern, determining a spraying area according to the shapes and the sizes of flow passages of different electrodialysis partition plates according to the set partition plate spraying pattern, and spraying a partition plate sealing frame to the spraying area;
3) the sprayed combined net film roll is subjected to primary rolling and shaping, then the release film is peeled off to separate a partition plate, the peeled release film is rolled, and the separated partition plate is subjected to secondary rolling and shaping and then subjected to thickness detection;
4) and cutting the partition board with stable thickness into an electrodialysis partition board, and punching a liquid collecting hole and a water distribution flow channel by the cut electrodialysis partition board according to the requirements of a membrane stack.
2. A continuous production method for a separator for an electrodialysis membrane stack according to claim 1, characterized in that: the dot-matrix spraying of the combined net film roll adopts spraying holes with nozzles arranged in a dot-matrix manner to spray.
3. A continuous production method for a separator for an electrodialysis membrane stack according to claim 1, characterized in that: the separation net is one or the combination of more than one of an extrusion net, a woven net and a punching net, and the whole thickness is 0.1-3 mm.
4. A continuous production method for a separator for an electrodialysis membrane stack according to claim 1, characterized in that: and the width tolerance of the gap of each rolling and shaping group of the primary rolling and shaping and the secondary rolling and shaping is controlled within +/-0.02 mm.
5. A continuous production method for a separator for an electrodialysis membrane stack according to claim 1, characterized in that: the melt index of the plastic adopted by the molten rubber compound is 50-1500.
6. A continuous production method for a separator for an electrodialysis membrane stack according to claim 1, characterized in that: and the spraying frequency of the molten rubber material for spraying the combined net film roll according to the set partition plate spraying pattern through the spray head is adapted to the linear speed of the combined net film roll.
7. A continuous production method for a separator for an electrodialysis membrane stack according to claim 1, characterized in that: and the rolling shaping of the primary rolling shaping and the secondary rolling shaping is that the sizing material is subjected to physical change or chemical change to be combined with the partition net to form the partition plate.
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| CN202010828134.8A CN111905569B (en) | 2020-08-18 | 2020-08-18 | Continuous manufacturing method of partition board for electrodialysis membrane stack |
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| CN202010828134.8A CN111905569B (en) | 2020-08-18 | 2020-08-18 | Continuous manufacturing method of partition board for electrodialysis membrane stack |
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| CN111905569B true CN111905569B (en) | 2022-03-11 |
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