CN108043613B - Double-faced curtain falling film coating process and application and device thereof - Google Patents

Double-faced curtain falling film coating process and application and device thereof Download PDF

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Publication number
CN108043613B
CN108043613B CN201711330873.9A CN201711330873A CN108043613B CN 108043613 B CN108043613 B CN 108043613B CN 201711330873 A CN201711330873 A CN 201711330873A CN 108043613 B CN108043613 B CN 108043613B
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coating
base material
coating liquid
substrate
double
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CN108043613A (en
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陈亦力
冯春磊
丑树人
徐航
代攀
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Beijing Originwater Membrane Technology Co Ltd
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Beijing Originwater Membrane Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002—Organic membrane manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/124—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to distance between spray apparatus and target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0278—Arrangement or mounting of spray heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/26—Spraying processes

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

The invention relates to the technical field of curtain coating, in particular to a double-sided curtain falling film coating process and application and a device thereof. The double-sided curtain falling coating process comprises the steps of spraying coating liquid on the surfaces of the two sides of a substrate, wherein a curtain formed by the coating liquid is vertical to the surface of the substrate; the spraying speed of the coating liquid on one surface of the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 2-500m/min, the moving speed of the base material is 2-500m/min, and the spraying distance between the two surfaces of the base material is 2-40 mm. The invention is mainly applied to the preparation of the separation membrane, the two sides of the base material are respectively coated with the membrane, the spraying speeds of the membrane coating liquids on the two sides of the base material are respectively regulated and controlled, the stable coating is realized by matching with the coating interval, and the coating with different thicknesses can be realized on the two sides of the base material according to the actual requirement; by regulating and controlling the spraying speed and matching with the coating interval, the base material can realize coating at different inclination angles.

Description

Double-faced curtain falling film coating process and application and device thereof
Technical Field
The invention relates to the technical field of curtain coating, in particular to a double-sided curtain falling film coating process and application and a device thereof.
Background
The existing coating technology applied to the separation membrane in the water treatment industry is mostly single-side scraper coating, the principle of the scraper coating is simple, excessive coating is coated on a base material through a feeding roller, and then the excessive coating is scraped off by a scraper. However, the blade coating method has high requirements on the substrate, and is not suitable for coating on the substrate with rough surface; the uniformity and the thickness of the surface of the coating are poor, and the performance stability and the service life of the film are influenced; the coating liquid has limited viscosity, the defects of material shortage such as needle holes, craters and the like are obvious when high-viscosity coating liquid is used, and the performance of the film is influenced when low-viscosity coating liquid is used and penetrates seriously and easily penetrates through a base material.
Thus, there are curtain coating methods for coating in the prior art, which are characterized primarily by non-contact coating methods, which do not apply mechanical stress to the substrate, reduce the risk of substrate breakage, and provide better coating coverage.
However, most of the conventional curtain coating methods involve single-side coating and have low coating efficiency. And the curtain of coating is vertical coating, and the substrate is perpendicular to the curtain, can not adjust the angle of substrate when coating, and adaptability is poor.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a double-sided curtain falling film coating process which is mainly used for preparing a separation film, can realize double-sided asynchronous coating, comprises different coating thicknesses on two sides and different surface shapes of a base material, can adjust the angles of a curtain and the base material during coating, and has strong adaptability.
The second purpose of the invention is to provide the double-sided curtain falling film coating device, which is simple and strong in operability, can better realize a double-sided curtain falling film coating process, and is suitable for different coating requirements.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a double-faced curtain falling film coating process comprises the following steps:
spraying coating liquid on the surfaces of the two sides of the substrate, wherein a curtain formed by the coating liquid is vertical to the surface of the substrate; the spraying speed of the coating liquid on one surface of the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 2-500m/min, and the moving speed of the base material is 2-500 m/min.
Compared with the prior art, the double-sided curtain falling coating process is non-contact coating, realizes coating on irregular substrates, is not influenced by the non-uniformity of the thickness of the substrates, can realize uniform coating on substrates with specific shapes (such as corrugated shapes or groove shapes) and keeps the original shapes; coating is respectively carried out on the two sides of the base material, the spraying speeds of the coating liquids on the two sides of the base material are respectively regulated and controlled, stable coating is realized by matching with the moving speed of the base material, and the coatings with different thicknesses can be respectively coated on the two sides of the base material according to actual requirements; in addition, by regulating and controlling the spraying speed and matching with the moving speed of the base material, the base material can realize coating at different inclination angles.
The two surfaces of the substrate can be asymmetric structures, such as a composite substrate with one smooth surface and one corrugated surface, a composite substrate with two corrugated surfaces (with the same or different shapes), a substrate with two smooth surfaces (with a corrugated shape in the middle), and other substrate structures, and the coating process can be adopted.
The double-sided curtain falling film coating process has wider coating speed, the speed can be increased to four or five hundred meters per minute, and the coating efficiency is greatly improved.
Preferably, the spraying distance between the two surfaces of the substrate is 2-40 mm. More preferably, the jetting pitch of both sides of the substrate is 4-20 mm.
Coating on two sides of the base material respectively, regulating and controlling the spraying speed of the coating liquid on two sides of the base material respectively, matching with the coating interval to realize stable coating, and coating coatings with different thicknesses on two sides of the base material respectively according to actual requirements; in addition, by regulating and controlling the spraying speed and matching with the coating interval, the base material can realize coating at different inclination angles
Preferably, a driving force is applied to the spraying end of the coating liquid so that the curtain formed by the coating liquid is vertical to the surface of the substrate. More preferably, the pushing force is one or both of air pressure and negative pressure suction force.
Under the specific jetting speed of the coating liquid on the two sides, the curtain falling coating is completed by matching and adjusting the magnitude of the driving force; when the spraying speed is high, a small driving force is exerted, and when the spraying speed is low, a large driving force is exerted, and then coating can be completed.
Preferably, the substrate is at an angle of 0 ° to 90 ° to the horizontal.
In the coating mode in the prior art, the angle between a base material and the horizontal plane is usually 0 degrees, and the inclination angle cannot be adjusted freely; the coating process can realize any inclination angle of the base material by adjusting the spraying speed and the driving force, and has strong adaptability.
Preferably, when the angle between the base material and the horizontal plane is 90 degrees, the spraying speed of the coating liquid on one surface of the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 2-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa;
when the angle between the base material and the horizontal plane is 60 degrees, the spraying speed of the coating liquid on one surface above the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 8-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa;
when the angle between the base material and the horizontal plane is 45 degrees, the spraying speed of the coating liquid on one surface above the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 10-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa;
when the angle between the base material and the horizontal plane is 0 degree, the spraying speed of the coating liquid on one surface above the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 12-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa.
When the spraying speed is within 50m/min, the spraying speed is slow, and the coating liquid is assisted by air pressure and/or negative pressure suction force, so that a curtain formed by the coating liquid is vertical to the surface of the substrate. When the spraying speed exceeds 50m/min, the curtain formed by the coating liquid can be made to be perpendicular to the surface of the substrate without assistance of air pressure and/or negative pressure suction force because the spraying speed is fast enough and the stability is good.
The invention also provides application of the double-sided curtain falling film coating process in preparation of a separation film. Different types of coating liquid can be sprayed according to actual needs.
The invention also provides a double-sided curtain falling film coating device which comprises two groups of coating units which are relatively independently arranged, wherein each group of coating units comprises a material supply kettle, a coating head and a discharge slit opening which are sequentially connected, and the distance between the discharge slit openings of the two groups of coating units is 2-40 mm.
The two sides of the coating unit are coated synchronously by two relatively independent coating units, wherein the coating units comprise coating liquids with different coating thicknesses and different functions on the two sides; the slit is adopted to extrude the coating liquid, so that a closed space is provided for the coating liquid, the influence of environmental factors is minimized, and particularly, the coating liquid can be fully defoamed without bringing bubbles again in the coating process; can be to the accurate even coating of realization ration of irregular substrate, relatively independent coating unit provides bigger operating space, convenient operation.
Preferably, the double-sided curtain falling coating device further comprises an air flow unit, wherein the air flow unit is arranged on one side of the discharge slit opening and provides a driving force for the coating liquid.
Preferably, each set of coating units further comprises a coating head cavity arranged between the coating head and the discharge slit. More preferably, each set of coating units further comprises a metering pump, which is arranged between the feeding kettle and the coating head. The metering pump is used for metering the amount of the coating liquid and providing feeding pressure to realize metering coating.
Preferably, the double-sided curtain coating device further comprises a transmission unit for transmitting the base material to enable the base material to pass through the coating units, and the two groups of coating units are respectively located on two sides of the base material. More preferably, the transmission unit comprises an unwinding mechanism and an unwinding guide roller, the unwinding mechanism is used for placing the substrate, and the unwinding guide roller supports and guides the substrate to pass through the coating unit.
Preferably, the double-sided curtain coating device that falls still includes aftertreatment case and aftertreatment deflector roll, the aftertreatment deflector roll sets up in the aftertreatment incasement, and the substrate passes through the transmission unit the coating unit is accomplished the coating after, the warp aftertreatment deflector roll support is in the aftertreatment incasement carries out the aftertreatment. More preferably, the post-treatment tank is a water bath treatment or a drying treatment.
Preferably, the double-sided curtain coating device that falls still includes winding mechanism and at least one rolling deflector roll, the substrate passes through behind the aftertreatment deflector roll process the rolling deflector roll inserts winding mechanism. Thereby completing the rolling of the substrate. More preferably, the winding mechanism is provided with a motor for driving the winding mechanism to rotate. The motor drives the winding mechanism to rotate, so that the substrate is put and collected in the whole coating process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the double-sided curtain coating process is non-contact coating, can coat irregular substrates, is not influenced by the non-uniformity of the thickness of the substrates, can realize uniform coating particularly on substrates with specific shapes (such as corrugated shapes or groove shapes), and keeps the original shapes;
(2) coating on two sides of the base material respectively, regulating and controlling the spraying speed of the coating liquid on two sides of the base material respectively, matching with the coating interval to realize stable coating, and coating coatings with different thicknesses on two sides of the base material respectively according to actual requirements;
(3) by regulating and controlling the spraying speed and matching with the coating interval, the base material can realize coating at different inclination angles, and the adaptability is strong;
(4) the double-sided curtain falling film coating process has wider coating speed, the speed can be increased to four or five hundred meters per minute, and the coating efficiency is greatly improved;
(5) the double-sided curtain falling film coating device can realize asynchronous coating of two sides through the two relatively independent coating units; the slit is adopted to extrude the coating liquid, so that a closed space is provided for the coating liquid, the influence of environmental factors is minimized, and particularly, the coating liquid can be fully defoamed without bringing bubbles again in the coating process; and the relatively independent coating unit provides a larger operation space and is convenient to operate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic structural view of a double-sided curtain falling film coating device according to the present invention;
FIG. 2 is a schematic structural diagram of an apparatus used in a double-sided curtain coating process in embodiment 2 of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus used in a double-sided curtain coating process in embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of an apparatus used in a double-sided curtain coating process in embodiment 4 of the present invention.
Reference numerals:
11-a feeding kettle; 12-a metering pump; 13-coating head;
14-coating head cavity; 15-discharge slit opening; 16-an air flow unit;
21-an unwinding mechanism; 22-unwinding guide rollers; 31-post treatment box;
32-post-treatment of the guide roller; 41-a winding mechanism; 42-rolling guide roller.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Please refer to fig. 1, which is a schematic structural diagram of a double-sided curtain coating device according to the present invention. The double-sided curtain falling film coating device comprises a coating unit, a transmission unit, a post-processing unit and a winding unit.
The double-sided curtain falling film coating device comprises two groups of coating units which are arranged relatively independently, wherein each group of coating units comprises a feeding kettle 11, a metering pump 12, a coating head 13, a coating head cavity 14, a discharge slit opening 15 and an air flow unit 16 arranged on one side of the discharge slit opening 15, which are sequentially connected. The coating material is placed in the feeding kettle 11, the temperature in the feeding kettle 11 is controlled to be 0-100 ℃, so that the coating material forms a coating liquid, the feeding is metered by the metering pump 12, and the flow rate of the feeding is preferably 24-960 mL/min. The metering pump 12 meters and provides the coating liquid to the coating head cavity 14, and the temperature of the coating head cavity 14 is controlled in a water circulation mode, an oil circulation mode, a steam heating mode or other medium circulation modes to enable the temperature to be 0-100 ℃. The coating liquid reaches the discharge slit opening 15 through the coating head chamber 14, and the coating liquid is ejected from the discharge slit opening 15 at a constant ejection speed. The distance between the discharge slit openings of the two groups of coating units is 2-40mm, preferably 4-20 mm. The air flow unit 16 is disposed at one side of the discharging slit opening 15, and provides a driving force for the coating liquid, and provides an air pressure or a negative pressure suction force when the coating liquid is ejected from the discharging slit opening 15, so as to adjust an angle of a curtain formed by the coating liquid. The position of the coating head 13 is adjustable and can move back and forth and up and down, thereby controlling the distance between the discharge slits 15 and the position of the coating film.
The conveying unit is used for conveying the base material to be coated, so that the base material to be coated passes through the discharge slit openings 15 of the two groups of coating units, and the two groups of coating units are respectively positioned on two sides of the base material. The transmission unit includes unwinding mechanism 21 and unreels deflector roll 22, unwinding mechanism 21 is used for placing the substrate of treating the coating, unreels deflector roll 22 and supports the guide and treat that the coated substrate passes between the ejection of compact slit 15 of two sets of coating units, makes the coating liquid that erupts from ejection of compact slit 15 evenly coat the both sides of the substrate of treating the coating.
And the base material to be coated passes through the two groups of coating units which are oppositely arranged to be coated, and is guided into the post-treatment unit for post-treatment through the guide roller support after the coating is finished. The post-treatment unit comprises a post-treatment tank 31 and a post-treatment guide roll 32. The post-treatment guide roller 32 is arranged in the post-treatment box 31, and the base material passes through the coating unit through the transmission unit to be coated, and is supported by the post-treatment guide roller 32 to be post-treated in the post-treatment box 31. The post-treatment tank 31 is subjected to water bath treatment or drying treatment, and is formed by entering water or fixed by heating or cooling, or is dried in other ways.
And rolling the coated substrate subjected to post-treatment by using a rolling unit. The winding unit includes a winding mechanism 41 and at least one winding guide roller 42. The post-treated substrate passes through the post-treatment guide roller 32 and then enters the winding mechanism 41 through the winding guide roller 42. The winding mechanism 41 is provided with a motor, and drives the winding mechanism 41 to rotate, so that the substrate is wound.
The direction of the double-sided curtain falling film coating device can be adjusted according to actual requirements, and the two groups of coating units can be horizontally arranged oppositely, can also be vertically arranged oppositely, and can also be obliquely arranged oppositely.
The material of both sides of the base material is usually PET, PP and other fibers, and the thickness of the base material is preferably 0.5-1.5 mm. The coating liquid is an effective separation layer material, can be PVDF, PES, PS and other materials, and preferably has a thickness of 20-125 μm.
The two sides of the coating unit are coated synchronously by two relatively independent coating units, wherein the coating units comprise coating liquids with different coating thicknesses and different functions on the two sides; the slit is adopted to extrude the coating liquid, so that a closed space is provided for the coating liquid, the influence of environmental factors is minimized, and particularly, the coating liquid can be fully defoamed without bringing bubbles again in the coating process; moreover, the device can quantitatively and accurately and uniformly coat irregular substrates, and provides a larger operation space and is convenient to operate due to relatively independent coating units.
Example 1
The embodiment provides a double-sided curtain falling coating process, which adopts a corrugated polyester non-woven fabric as a base material, adopts a high polymer solution (polyvinylidene fluoride/dimethyl formamide DMF) for preparing an ultramicro filter membrane as a coating material, and places the coating material in a material supply kettle 11 to be heated to 40-80 ℃ to form a coating liquid, wherein the viscosity of the coating liquid is 5000-. In this example, the angle of the substrate to be coated to the horizontal is 90 °, and the two groups of spraying units are arranged horizontally, as shown in fig. 1, and the distance between the discharge slit openings 15 of the two groups of coating units is 4 mm. The distance between the discharge slit openings 15 of the two coating units is not limited to this, and may be adjusted according to the spraying speed of the coating liquid, and may be 2 to 40mm, preferably 4 to 20 mm.
The corrugated polyester nonwoven fabric substrate is placed in the unwinding mechanism 21, and the substrate is supported and guided between the discharge slits 15 of the two coating units by the unwinding guide roller 22 and is connected to the winding mechanism 41. The winding and unwinding tension of the base material is 10-100N.
Starting the metering pump 12, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach the discharge slit opening 15 through the coating head 13, and spraying the coating liquid on the surface of the base material through the discharge slit opening 15 at a speed of 8m/min, and simultaneously starting the air flow unit to provide a 2Pa driving force for the sprayed coating liquid, so that the falling curtain formed by the coating liquid is perpendicular to the surface of the base material, namely the angle between the falling curtain formed by the coating liquid and the base material is 90 degrees. And meanwhile, starting a motor of the winding mechanism 41 to transmit the base material at the speed of 8m/min, so that the coating liquid is continuously and uniformly coated on the surface of the base material.
The double-sided curtain falling coating process is non-contact coating, realizes coating on irregular base materials and is not influenced by the non-uniformity of the thickness of the base materials; coating is respectively carried out on the two sides of the base material, the spraying speed of the coating liquid on the two sides of the base material is respectively regulated and controlled, stable coating is realized by matching with the coating interval, and the coating with different thicknesses can be respectively coated on the two sides of the base material according to actual requirements; in addition, by regulating and controlling the spraying speed and matching with the coating interval, the base material can realize coating at different inclination angles. The double-sided curtain falling film coating process has wider coating speed, the speed can be increased to four or five hundred meters per minute, and the coating efficiency is greatly improved.
Example 2
The embodiment provides a double-faced curtain coating process, which adopts a polyester non-woven fabric as a base material, a high-molecular solution (polyvinylidene fluoride/dimethylacetamide DMAc) for preparing an ultramicro filter membrane as a coating material, and the coating material is placed in a feeding kettle 11 and heated to 40-80 ℃ to form a coating liquid, wherein the viscosity of the coating liquid is 5000-. In this embodiment, the angle between the substrate to be coated and the horizontal plane is 60 °, two sets of spraying units are disposed on two sides of the substrate and perpendicular to the surface of the substrate, the two sets of spraying units are 30 ° from the horizontal, and the distance between the discharging slits 15 of the two sets of coating units is 4 mm. Please refer to fig. 2, which is a schematic structural diagram of an apparatus used in the double-sided curtain coating process of the present embodiment.
The polyester substrate is arranged in a non-woven manner on the unwinding device 21, is supported on one side by an unwinding guide roller 22 and guided through the two groups of coating units between the discharge slits 15 and is fed into the winding device 41. The winding and unwinding tension of the base material is 10-100N.
And (2) starting a metering pump 12 of the coating unit on one surface above the base material, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach a discharge slit opening 15 through a coating head 13, spraying the coating liquid on the surface of one surface above the base material at the speed of 10m/min through the discharge slit opening 15, and simultaneously starting an air flow unit to provide 2Pa driving force for the sprayed coating liquid, so that a falling curtain formed by the coating liquid is perpendicular to the surface of the base material, namely the angle between the falling curtain formed by the coating liquid and the base material is 90 degrees. And simultaneously, starting a metering pump 12 of the coating unit on one surface below the base material, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach a discharge slit opening 15 through a coating head 13, spraying the coating liquid on the surface of one surface below the base material at the speed of 10m/min through the discharge slit opening 15, and simultaneously starting an air flow unit to provide 2Pa driving force for the sprayed coating liquid, so that the angle between a curtain formed by the coating liquid and the base material is 90 degrees. And meanwhile, starting a motor of the winding mechanism 41 to transmit the base material at a speed of 10m/min, so that the coating liquid is continuously and uniformly coated on the surface of the base material.
Example 3
The embodiment provides a double-sided curtain falling coating process, which adopts a polyester non-woven fabric as a base material, adopts a high polymer solution (polyvinylidene fluoride/N-methylpyrrolidone NMP) for preparing an ultramicro filter membrane as a coating material, and places the coating material in a material supply kettle 11 to be heated to 40-80 ℃ to form a coating liquid, wherein the viscosity of the coating liquid is 5000-. In this embodiment, the angle between the substrate to be coated and the horizontal plane is 45 °, two sets of spraying units are disposed on two sides of the substrate and perpendicular to the surface of the substrate, the two sets of spraying units are 45 ° from the horizontal, and the distance between the discharging slits 15 of the two sets of coating units is 4 mm. Please refer to fig. 3, which is a schematic structural diagram of an apparatus used in the double-sided curtain coating process of the present embodiment.
The polyester substrate is arranged in a non-woven manner on the unwinding device 21, is supported on one side by an unwinding guide roller 22 and guided through the two groups of coating units between the discharge slits 15 and is fed into the winding device 41. The winding and unwinding tension of the base material is 10-100N.
And (2) starting a metering pump 12 of the coating unit on one surface above the base material, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach a discharge slit opening 15 through a coating head 13, spraying the coating liquid on the surface of one surface above the base material at the speed of 12m/min through the discharge slit opening 15, and simultaneously starting an air flow unit to provide 2Pa driving force for the sprayed coating liquid, so that a falling curtain formed by the coating liquid is perpendicular to the surface of the base material, namely the angle between the falling curtain formed by the coating liquid and the base material is 90 degrees. And simultaneously, starting a metering pump 12 of the coating unit on one surface below the base material, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach a discharge slit opening 15 through a coating head 13, spraying the coating liquid on the surface of one surface below the base material at a speed of 12m/min through the discharge slit opening 15, and simultaneously starting an air flow unit to provide a 2Pa driving force for the sprayed coating liquid, so that the angle between a curtain formed by the coating liquid and the base material is 90 degrees. And meanwhile, starting a motor of the winding mechanism 41 to transmit the base material at a speed of 12m/min, so that the coating liquid is continuously and uniformly coated on the surface of the base material.
Example 4
The embodiment provides a double-sided curtain falling coating process, which adopts a polypropylene non-woven fabric as a base material, a high-molecular solution (polyvinylidene fluoride/dimethyl sulfoxide (DMSO)) for preparing an ultramicro filter membrane as a coating material, the coating material is placed in a feeding kettle 11 and heated to 40-80 ℃ to form a coating liquid, and the viscosity of the coating liquid is 5000-. In this embodiment, the angle between the substrate to be coated and the horizontal plane is 0 °, the two groups of spraying units are arranged vertically, and the distance between the discharge slits 15 of the two groups of coating units is 4 mm. Please refer to fig. 4, which is a schematic structural diagram of an apparatus used in the double-sided curtain coating process of the present embodiment.
The polypropylene polyester non-woven fabric base material is placed in the unwinding mechanism 21, and one side of the base material is supported and guided through the discharge slits 15 of the two groups of coating units through the unwinding guide roller 22 and is connected to the winding mechanism 41. The winding and unwinding tension of the base material is 10-100N.
And (2) starting a metering pump 12 of the coating unit on one surface above the base material, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach a discharge slit opening 15 through a coating head 13, spraying the coating liquid on the surface of one surface above the base material at a speed of 15m/min through the discharge slit opening 15, and simultaneously starting an air flow unit to provide 2Pa driving force for the sprayed coating liquid, so that a falling curtain formed by the coating liquid is perpendicular to the surface of the base material, namely the angle between the falling curtain formed by the coating liquid and the base material is 90 degrees. And simultaneously, starting a metering pump 12 of the coating unit on one surface below the base material, adjusting the metering pump 12 to provide a certain feeding pressure of 6atm, enabling the coating liquid to reach a discharge slit opening 15 through a coating head 13, spraying the coating liquid on the surface of one surface below the base material at a speed of 15m/min through the discharge slit opening 15, and simultaneously starting an air flow unit to provide a 2Pa driving force for the sprayed coating liquid, so that the angle between a curtain formed by the coating liquid and the base material is 90 degrees. And meanwhile, starting a motor of the winding mechanism 41 to transmit the base material at a speed of 15m/min, so that the coating liquid is continuously and uniformly coated on the surface of the base material.
Experimental example 1
The coating properties of the separation membranes prepared by the double-sided curtain coating process described in examples 1 to 4 of the present invention were tested, and the test results are shown in table 1 below.
Table 1 results of testing coating properties of separation membranes prepared in examples 1 to 4
Figure BDA0001506620770000121
As can be seen from table 1, the double-sided curtain coating process of the present invention is non-contact coating, is not affected by the non-uniformity of the thickness of the substrate, and can achieve uniform coating, and the substrate can achieve coating at different inclination angles by adjusting the spraying speed and matching the moving speed of the substrate.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims (9)

1. A double-faced curtain falling film coating process is characterized by comprising the following steps:
spraying coating liquid on the surfaces of the two sides of the substrate, wherein a curtain formed by the coating liquid is vertical to the surface of the substrate; the spraying speed of the coating liquid on one surface of the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 2-500m/min, and the moving speed of the base material is 2-500 m/min;
the structure of the substrate comprises: any one of a composite substrate structure with one smooth surface and one corrugated surface, a composite substrate structure with two corrugated surfaces and a substrate structure with two smooth surfaces;
the spraying distance between the two surfaces of the base material is 2-40 mm;
the angle between the base material and the horizontal plane is 0-90 degrees;
exerting a driving force at the spraying end of the coating liquid to enable a curtain formed by the coating liquid to be vertical to the surface of the substrate;
the pushing force is one or two of air pressure and negative pressure suction force;
when the angle between the base material and the horizontal plane is 90 degrees, the spraying speed of the coating liquid on one surface of the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 2-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa;
when the angle between the base material and the horizontal plane is 60 degrees, the spraying speed of the coating liquid on one surface above the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 8-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa;
when the angle between the base material and the horizontal plane is 45 degrees, the spraying speed of the coating liquid on one surface above the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 10-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa;
when the angle between the base material and the horizontal plane is 0 degree, the spraying speed of the coating liquid on one surface above the base material is 2-500m/min, the spraying speed of the coating liquid on the other surface of the base material is 12-500m/min, the moving speed of the base material is 2-500m/min, the air pressure is 0-10Pa, and the negative pressure suction force is 0-10 Pa.
2. Use of the double-sided curtain coating process of claim 1 for the preparation of separation membranes.
3. The double-sided curtain falling film coating device for implementing the process of claim 1 is characterized by comprising two groups of coating units which are arranged relatively independently, wherein each group of coating units comprises a feeding kettle, a coating head and a discharge slit opening which are connected in sequence, and the distance between the discharge slit openings of the two groups of coating units is 2-40 mm;
the double-sided curtain falling film coating device further comprises an air flow unit, wherein the air flow unit is arranged on one side of the discharging slit opening and provides a driving force for the coating liquid.
4. The double-sided curtain coating apparatus of claim 3 wherein each set of coating units further comprises a coating head cavity disposed between the coating head and the discharge slot.
5. The double-sided curtain coating apparatus of claim 3 wherein each set of coating units further comprises a metering pump disposed between the feed tank and the coating head.
6. The double-sided curtain coating apparatus according to claim 3, further comprising a conveying unit for conveying the substrate through the coating units, wherein the two groups of coating units are respectively located at both sides of the substrate.
7. The double-sided curtain coating apparatus according to claim 6, wherein the conveying unit comprises an unwinding mechanism for placing the substrate and an unwinding guide roller supporting and guiding the substrate through the coating unit.
8. The double-sided curtain coating apparatus according to claim 6, further comprising a post-treatment tank and a post-treatment guide roller, wherein the post-treatment guide roller is disposed in the post-treatment tank, and the post-treatment guide roller supports a substrate in the post-treatment tank for post-treatment after the substrate passes through the coating unit by the transfer unit and is coated.
9. The double-sided curtain falling film coating device as claimed in claim 8, further comprising a winding mechanism and at least one winding guide roller, wherein the substrate passes through the post-treatment guide roller and then enters the winding mechanism through the winding guide roller.
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