CN113828492A - Continuous coating system and coating method - Google Patents
Continuous coating system and coating method Download PDFInfo
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- CN113828492A CN113828492A CN202010595205.4A CN202010595205A CN113828492A CN 113828492 A CN113828492 A CN 113828492A CN 202010595205 A CN202010595205 A CN 202010595205A CN 113828492 A CN113828492 A CN 113828492A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a continuous coating system and a coating method, belongs to the technical field of coating devices, and solves the problem that in the prior art, an organic semiconductor material cannot be used for quickly and efficiently preparing a film in a large area and simultaneously accurately controlling the appearance and the stacking structure of the film. The continuous coating system comprises a frame, a coating unit, a liquid supply device, a coating unit moving device, a temperature control base station unit and a base material conveying device, wherein the coating unit moving device, the temperature control base station unit and the base material conveying device are arranged on the frame; the substrate conveying device is used for conveying the substrate; the liquid supply device provides coating liquid for the base material; the coating unit is arranged on the coating unit moving device, and the coating unit moving device is used for controlling the distance and the angle between the coating unit and the base material; the coating unit controls the thickness and the appearance of a coating film by applying shearing force to the coating liquid; the coating unit comprises a horizontal adjusting disc and a traction sheet, wherein the horizontal adjusting disc is used for adjusting a pitch angle so as to ensure the level of the initial position of the traction sheet. The invention realizes the preparation of the organic film with large-area orderly arrangement.
Description
Technical Field
The invention belongs to the technical field of coating devices, and particularly relates to a continuous coating system and a coating method.
Background
Organic semiconductor materials have become one of the hot research spots in organic electronics due to the diversity of their molecular structures and great potential in flexible display, energy storage and conversion. With the functional breakthrough and application prospects of flexible electronic devices in the fields of media, health monitoring, clean energy and the like, the solution processing and preparation of organic semiconductor materials with large area, low cost and high quality becomes one of the difficulties in the field.
For organic electronics research, the organic layer is a critical region for charge transport. At normal temperature, charge transport between molecules in the organic layer is mainly carried out by means of a hopping mode, so that the intermolecular/intermolecular distance and stacking mode are of great importance, and intermolecular force is a tool which can be utilized to adjust the stacking structure of molecules. The aggregation of organic material molecules depends on weak intermolecular interaction, and the molecular structure and the solid-state stacking structure of the organic material jointly determine the performance of the material in a device. The development of a rapid and continuous solution processing technology capable of accurately controlling film forming conditions is a key point for realizing device performance breakthrough, function expansion and application transformation.
Although the existing solution processing technologies such as spin coating, film dropping, ink-jet printing, gravure printing and the like can also be operated quickly, most of the formed organic thin films have disordered molecular stacking (a small part of polymer films can improve the molecular orientation in the films through annealing), but most of the solution in the spin coating method is wasted. Preparing organic films by using a spinning, film dropping and ink-jet printing method is only limited to laboratory-level small-scale (spinning is less than 3cm x 3 cm; film dropping can be larger in principle, but obvious aggregative boundary and discontinuity can be generated in the process of natural volatilization by a solvent; ink-jet printing can be printed in a larger range, but the speed is very slow, liquid drops are required to be continuously overlapped and covered, continuous precipitation-dissolution-re-precipitation of molecules is involved, and the appearance and the orderliness are difficult to control); however, the utilization rate of materials of printing technologies such as gravure printing is low, and most of molecular materials synthesized by self-designed technology cannot support the synthesis of materials required for mass printing at all. Therefore, the organic film with large area and ordered arrangement prepared by efficiently utilizing the material has great technical difficulty.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a continuous coating system and a continuous coating method, which can realize rapid and efficient continuous film formation by a solution method, and can optimize the film morphology and the stacking structure by accurately controlling the film formation conditions.
The purpose of the invention is mainly realized by the following technical scheme:
the invention provides a continuous coating system, which comprises a frame, a coating unit, a liquid supply device, a coating unit moving device, a temperature control base station unit and a base material conveying device, wherein the coating unit moving device, the temperature control base station unit and the base material conveying device are arranged on the frame;
the substrate conveying device is used for conveying the substrate; the liquid supply device provides coating liquid for the base material;
the coating unit is arranged on the coating unit moving device, and the coating unit moving device is used for controlling the distance and the angle between the coating unit and the base material; the coating unit controls the thickness and the appearance of a coating film by applying shearing force to the coating liquid; the coating unit comprises a horizontal adjusting disc and a traction sheet, wherein the horizontal adjusting disc is used for adjusting a pitch angle so as to ensure the level of the initial position of the traction sheet;
the temperature control base station unit is used for controlling the temperature of the base material and promoting the curing of the coating liquid.
Further, the coating unit moving device comprises a fixed base fixed on the frame, an electric displacement table arranged on the fixed base and an electric rotating table arranged on the electric displacement table; the coating unit is arranged on the electric rotating table.
Further, the coating unit also comprises a T-shaped connecting piece and a vacuum suction disc;
the vacuum suction disc is arranged below the horizontal adjusting disc and is matched with the pump to fix the traction sheet; the horizontal adjusting disk is connected with a T-shaped connecting piece, and the T-shaped connecting piece is fixed on the electric rotating platform.
Further, the drawing sheet is a planar structure with at least one straight line side and is used for applying shearing force to the coating liquid.
Further, the horizontal adjusting disc comprises a fixing plate, an adjusting piece and a first fixing piece;
one end of the fixing plate is connected with the T-shaped connecting piece, and the other end of the fixing plate is connected with the adjusting plate;
the adjusting plate is arranged below the fixing plate, one angle of the fixing plate and one angle of the adjusting plate are fixed by the first fixing part, and the adjusting part is lifted away from other angle or angles of the adjusting plate to adjust the pitch angle of the adjusting plate.
Further, the temperature control base station unit comprises a temperature control module, a horizontal base station, a lifting mechanism, a horizontal movement adjusting mechanism and a bracket;
the temperature control module is fixed on the horizontal base platform through the second fixing piece, the horizontal base platform is fixed on the lifting mechanism, the lifting mechanism is fixed on the horizontal adjusting mechanism, the horizontal adjusting mechanism is fixed on the support, and the support is fixed on the frame.
Further, the base material conveying device comprises a first rotary roller for rolling and a second rotary roller for unreeling; first rotatory roller and the rotatory roller of second all are provided with the fixed inserted sheet structure of jackscrew that is used for fixed substrate tip.
Further, the device also comprises a microscopic observation device for observing the position of the coating unit and the formation condition of the coating film.
Further, the device also comprises a shielding cover used for keeping the environment clean.
The invention also provides a coating method of the continuous coating system, which comprises the following steps:
step 1, before the coating process starts, the base material is kept in a tensioning state, a horizontal adjusting disc of a coating unit is manually adjusted to enable a traction sheet of the coating unit to be in a horizontal state, and an electric system accurately controls an electric rotating table and an electric displacement table on a coating unit moving device through a program under the coordination of a microscopic observation device to enable the traction sheet of the coating unit to reach and keep a position which is away from a flexible base material by a set interval at a required angle;
step 2, the liquid supply device conveys the coating liquid to the edge of one end of the drawing sheet far away from the base material, and the coating liquid is spread between the base material and the drawing sheet under the siphon action;
and 3, controlling the base material conveying device to stably convey the base material in a constant speed state through an electrical system, and heating the base material and the coating liquid to a set temperature for efficient film formation of the coating liquid through a temperature control module when the base material passes through the temperature control base station unit below the coating unit, so that the preparation of the coating film is realized.
Compared with the prior art, the invention can at least realize one of the following technical effects:
1) the invention combines a shearing coating technology, a continuous liquid supply technology and a continuous transmission technology to construct a continuous coating system, wherein a coating unit can realize the regulation and control of the thickness and the appearance of a coating film under the conditions of different solutions (solvents and concentrations) by applying a horizontal acting force under the temperature control condition of a base station, thereby realizing the rapid, efficient and large-area controllable preparation of the coating film. In actual operation, the adjustment of the shearing force is realized by adjusting the angle of the traction sheet, the moving speed of the traction sheet relative to the base material and the control of the distance between the lower edge of the traction sheet (after forming an acute included angle with the horizontal plane) and the base material, so that the orientation and the intermolecular accumulation structure of molecules in the organic layer at different temperatures are adjusted, and the short-range molecular orientation and the long-range order of the organic film are optimized.
2) The coating unit moving device comprises an electric displacement table and an electric rotating table, the electric displacement table controls the distance between the coating unit and the base material, the electric rotating table controls the included angle theta between the coating unit and the base material, and the thickness and the appearance of different solution coating films can be regulated and controlled under the base station temperature control condition by changing the distance between the coating unit traction sheet and the base material, the included angle between the coating unit traction sheet and the base material moving speed.
3) The mechanical piece can not be guaranteed to be completely vertical or parallel to a horizontal plane after being processed, spliced and fixed, and the initial position can be guaranteed to be horizontal only by proper adjustment.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is an overall structural view of a continuous coating system according to a preferred embodiment of the present invention;
FIG. 2 is a perspective view of a continuous coating system according to a preferred embodiment of the present invention;
FIG. 3 is a perspective view of a continuous coating system according to a preferred embodiment of the present invention;
FIG. 4 is a view showing the construction of a coating unit moving device of the continuous coating system according to the preferred embodiment of the present invention;
FIG. 5 is a front view of a temperature control base unit and a back view of a temperature control module of the continuous coating system according to the preferred embodiment of the present invention;
FIG. 6 is a drawing unit configuration view of the continuous coating system of the preferred embodiment of the present invention;
FIG. 7 is a structural view of a substrate transfer apparatus of a continuous coating system according to a preferred embodiment of the present invention;
FIG. 8 is a photo of the morphology of a coating film of a certain organic small molecular material under four conditions of changing the distance and the included angle between a traction sheet and a base material, and increasing the solution concentration and the base material conveying speed;
FIG. 9 is a photograph of the morphology of a coating film prepared by the organic small molecule material under the condition of the same concentration of different solvents;
FIG. 10 is a schematic drawing of the shear of the solution by the pull tab;
FIG. 11 is a schematic view of a liquid supply apparatus.
Reference numerals:
1-continuous coating system; 10-a substrate; 11-a coating unit moving device; 111-a stationary base; 112-an electric displacement table; 113-electric rotating table; 12-a temperature controlled base unit; 121-a temperature control module; 1211-thermocouple bore; 1212-vacuum suction hole; 1213-vacuum suction of the seam; 1214-a heat transfer sheet; 1215-heating a sheet; 1216-heat sink; 122-a horizontal abutment; 123-a lifting mechanism; 124-horizontal movement adjusting mechanism; 125-a scaffold; 126-a second fixture; 13-a coating unit; 131-vacuum suction disc; 132-horizontal adjustment disk; 1321-a first adjustment member; 1322-a second adjustment member; 1323-a first mount; 133-T type connecting piece; 134-a traction sheet; 14-a substrate transport device; 141-a servo motor; 142-jackscrew fixing insert; 143-a first rotating drum; 144-a second rotating drum; 15-a liquid supply device; 151-screw pump; 152-a reservoir mechanism; 153-liquid delivery tube; 154-a multi-channel module; 16-microscopic observation device; 17-a frame; 18-a shield; 19-electric system, 20-area light source.
Detailed Description
A continuous coating system is described in further detail below with reference to specific examples, which are provided for purposes of comparison and explanation only, and the present invention is not limited to these examples.
It should be noted that, in the present invention, the description of indicating the orientation or positional relationship such as "upper, lower, left, right, front, rear, inner, outer, vertical, horizontal, top, bottom, middle" and the like is used only for the convenience of description and understanding of the present invention, and does not indicate or imply that the device or element must have a specific orientation, be constructed or operated in a specific orientation, especially when describing that a certain component or device is "fixed" or "connected" to another device or element, the device or element may be directly fixed or connected to another element or may be indirectly fixed or connected to another element, and thus, the present invention should not be construed as being limited thereto.
Likewise, the terms "first," "second," and the like are used solely to distinguish similar elements having the same arrangement and function, and are not to be construed as indicating or implying relative importance.
A continuous coating system 1 for achieving rapid, efficient, large-area controlled production of a coating film, as shown in fig. 1-3, comprising: a frame 17 and a coating unit 13, a liquid supply device 15, and a coating unit moving device 11, a temperature-controlled base unit 12, and a base material transfer device 14 provided on the frame 17; the substrate conveying device 14 is used for controlling the substrate 10 to stably and uniformly drive; the liquid supply device 15 stably supplies the coating liquid to the base material 10 at a constant speed; the coating unit 13 is arranged on the coating unit moving device 11, and the coating unit moving device 11 is used for controlling the distance between the coating unit 13 and the base material 10 and the formed angle; the coating unit 13 optimizes and controls the thickness and the morphology of the coating film by applying a shearing force to the coating liquid; the temperature control base unit 12 is used to control the temperature of the substrate 10 and promote the curing of the coating liquid.
The invention combines the shearing coating technology, the continuous liquid supply technology and the continuous transmission technology to construct a continuous coating system 1, wherein a coating unit 13 can apply horizontal shearing force to coating liquid by using a traction sheet 134 at a position with controllable height from a base material 10, under the condition of controlling the temperature of a base station 12, the molecular arrangement and the accumulation structure in an organic coating film are improved to optimize the crystal orientation, the regulation and control of the thickness and the appearance of the coating film are realized, and under the constant-speed and stable film supply matching of a base material transmission device 14 and a continuous liquid supply device 15, the rapid, efficient and large-area controllable preparation of the coating film is realized. If the substrate or the liquid supply is not uniform and stable, the coating liquid will be suddenly reduced, and the thickness and the shape of the film will be greatly changed. The stability and the uniform speed are basic conditions for ensuring the realization of controllable and continuous coating of the organic film.
As shown in fig. 4, the coating unit moving device 11 includes a fixed base 111 for fixing on the frame 17, an electric displacement table 112 provided on the fixed base 111, and an electric rotary table 113 provided on the electric displacement table 112; the coating unit 13 is provided on the electric rotary table 113. The electric displacement table 112 drives the coating unit 13 to move vertically up and down (Z axis) so as to control the distance between the coating unit and the substrate 10, and the electric displacement table 112 is a ball screw drive, for example. The electric rotating table 113 drives the coating unit 13 to rotate around the central axis of the electric rotating table 113, so as to control the included angle θ between the coating unit and the substrate 10. As shown in fig. 10, the included angle θ is small, and the effect of adjusting the morphology and the stacking structure by shearing coating can be achieved below 5 °, so that the solution is spread below the drawing sheet 134 to play a role of shearing. As shown in fig. 8 and 9, by changing the distance and the included angle between the traction sheet 134 of the coating unit 13 and the substrate 10 and the moving speed of the substrate 10, the molecular stacking structure of the coating material under different solution conditions (solvent and concentration) under the temperature control condition of the base station is optimized, and the thickness and the shape of the coating film of different solutions under the temperature control condition of the base station 12 can be adjusted. As shown in fig. 6, the coating unit 13 includes a T-shaped connector 133, a horizontal adjustment disk 132, a vacuum suction disk 131, and a drawing piece 134; the vacuum suction disc 131 is arranged below the horizontal adjusting disc 132, and the vacuum suction disc 131 is matched with the pump to fix the traction sheet 134; the horizontal adjusting disc 132 is used for adjusting the pitch angles of the vacuum suction disc 131 and the traction sheet 134 to ensure the level of the initial positions; the horizontal adjustment plate 132 is connected to a T-shaped connecting member 133, and the T-shaped connecting member 133 is fixed to the electric rotary table 113. Preferably, the drawing sheet 134 is a planar structure having at least one straight side (i.e. one end near the substrate 10 is a straight side) for applying a shearing force to the coating liquid, and by comprehensively adjusting factors such as the moving speed of the coil, the distance and angle of the drawing sheet, the molecular stacking structure of the coating material under different solution conditions (solvent and concentration) under the temperature control condition of the base station is optimized, so as to realize the optimized regulation and control of the morphology and stacking structure of the coating material.
Preferably, the traction sheet 134 is a single-warped-side quadrilateral structure, and the smooth end is used for applying a shearing force to the coating liquid to optimally regulate and control the morphology and the accumulation structure of the coating material. Further, a siphon port 1341 is formed at the raised end. The siphon port 1341 is set to facilitate the introduction of the solution when the drawing sheet is at a small angle, and the solution concentration and cleanliness are protected by one layer.
The horizontal adjustment plate 132 includes a fixing plate, an adjustment member, and a first fixing member 1323; one end of the fixing plate is connected with the T-shaped connecting piece 133, and the other end is connected with the adjusting plate; the adjusting plate is disposed below the fixing plate, the first fixing element 1323 fixes one corner of the fixing plate and one corner of the adjusting plate, and the adjusting element is pressed against one or more other corners of the adjusting plate by screwing or the like to adjust the pitch angle of the adjusting plate (for example, the adjusting element is a bolt, and the adjusting plate is pressed against the fixing plate by screwing). Illustratively, the adjustment members include a first adjustment member 1321 and a second adjustment member 1322; the fixing piece comprises a fixing pin and a spring; one corner of the fixing plate is provided with a stepped hole, and the diameter of an upper hole of the stepped hole is larger than that of a lower hole; the spring is arranged in the upper hole, and the fixing pin penetrates through the spring and the stepped hole to be fixed on the adjusting plate. The first adjusting piece 1321 and the second adjusting piece 1322 are arranged at two opposite corners of the fixing plate, the lower ends of the first adjusting piece 1321 and the second adjusting piece 1322 are flush with the lower end of the fixing plate, the heights of the first adjusting piece 1321 and the second adjusting piece 1322 are both larger than the thickness of the fixing plate, and the pitch angle of the adjusting plate is adjusted by vertically adjusting the first adjusting piece 1321 and the second adjusting piece 1322. The pitch angle is adjusted in order to adjust the level of coating unit pull plate initial position, and mechanical part can not guarantee completely perpendicularly or be on a parallel with the horizontal plane after processing, splicing fixed, need carry out appropriate regulation and just can guarantee the level of initial position. After the level of the traction sheet is adjusted, the traction sheet is adjusted to the angle required in the coating process through the electric rotating table.
As shown in fig. 5, the temperature control base unit 12 includes a temperature control module 121, a horizontal base 122, a lifting mechanism 123, a horizontal movement adjusting mechanism 124, and a bracket 125; the temperature control module 121 is fixed on the horizontal base 122 by the second fixing member 126 through the vertical through hole of the heat transfer sheet 1214, the horizontal base 122 is fixed on the lifting mechanism 123, the lifting mechanism 123 is fixed on the horizontal movement adjusting mechanism 124, the horizontal movement adjusting mechanism 124 is fixed on the bracket 125, and the bracket 125 is fixed on the frame 17. In order to prevent the temperature control module 121 from damaging the substrate 10, the edge of the upper surface thereof is chamfered. Preferably, the elevating mechanism 123 is composed of an elevating table having a minute head for precisely adjusting the vertical height (Z-axis) of the base; the horizontal movement adjusting mechanism 124 is driven by a lead screw for adjusting the distance (Y-axis) between the base and the frame 17 structure. Illustratively, the bracket 125 is L-shaped, the temperature control module 121, the horizontal base 122, the lifting mechanism 123 and the horizontal movement adjusting mechanism 124 are fixed on one side of the bracket 125, the other side of the bracket 125 is provided with a mounting hole, and the bracket 125 is fixed on the frame 17 through the mounting hole. A reinforcing rib is further provided on the support 125 for improving the stability of the temperature control base station unit 12. The temperature control base unit 12 can adjust the height (Z-axis) position of the temperature control module 121 and the distance (Y-axis) from the frame 17. The temperature control module 121 is composed of a heat fin 1215, a heat transfer fin 1214, and a heat sink 1216. The heat transfer sheet 1214 for holding the substrate 10 has a thermocouple hole 1211 for inserting a thermocouple and a vacuum suction hole 1212 for connecting a vacuum pump formed on a non-chamfered side (both sides). Preferably, in order to make the substrate 10 more flat against the surface of the heat transfer sheet 1214, vacuum suction slits 1213 are formed on the upper surface of the heat transfer sheet 1214 to communicate with the vacuum suction holes, and the vacuum suction slits 1213 (which may have one or n pieces) are typically oriented parallel to the substrate transport direction. The temperature control of the temperature control module 121 is achieved by intermittently energizing the resistive heater strip 1215 through temperature sensing and feedback of a thermocouple by a remote temperature controller. In order to reduce the heat conduction from the heat sink to the lower part, a heat sink is disposed below the heat sink 1215, which is, for example, a parallel groove structure, or a prism array structure or other structures for facilitating heat dissipation.
As shown in fig. 7, the substrate transfer device 14 includes a first rotating roller 143 for taking-up and a second rotating roller 144 for unreeling; the first rotary roller 143 and the second rotary roller 144 are both provided with a top thread fixing insertion sheet 142 structure for fixing the end of the substrate 10, and the first rotary roller 143 and the second rotary roller 144 fix the two ends of the substrate 10 respectively. The substrate conveying device 14 is driven by a servo motor 141 to drive the first rotary roller 143 and the second rotary roller 144 to rotate at a speed controlled by a program, so as to complete the continuous conveying of the substrate 10. Preferably, the substrate 10 is a flexible substrate.
The first conveying roller and the second conveying roller are arranged on two sides of the temperature control base station unit 12, the highest point of the first conveying roller and the second conveying roller in the Z-axis direction is lower than the temperature control module 121 of the temperature control base station unit 12, the coating unit 13 is arranged above the temperature control base station unit 12, and during coating, the base material 10 passes through the upper surface of the temperature control module 121 of the temperature control base station unit 12.
Preferably, the continuous coating system 1 further includes a microscopic observation device 16 for observing the position of the coating unit 13 and the formation of the coating film, and the microscopic observation device 16 includes a focusing mechanism. In order to improve the light intensity at the coating position and to improve the observation clarity, particularly in order to adjust the minute distance between the linear side of the coating unit drawing piece 134 and the substrate 10, a surface light source 20 is further provided.
The liquid supply device 15 of the present invention is a continuous liquid supply device 15, as shown in fig. 11, including a screw pump 151, a liquid storage mechanism 152, a multi-channel module 154 and a liquid supply tube 153; the screw rod pump consists of a stepping motor, a screw rod and an injector bracket; the injector support can reversely fix the two injectors, and when the stepping motor drives the screw rod to push the first injector to output a certain volume of coating liquid outwards at a set speed, the second injector pumps in the coating liquid with the same volume from the liquid storage mechanism 152 at the same speed. The liquid sending tube 153 is provided with a three-way valve structure between the injector, the liquid storage mechanism 152 and the multi-channel module 154, and is used for switching the coating liquid from the liquid storage mechanism to the injector and from the injector to the multi-channel module, thereby ensuring continuous and stable supply of the coating liquid. The multi-channel module 154 is used for intensively fixing a plurality of liquid sending pipes 153 of the same coating liquid or different coating liquids, and the ports of the liquid sending pipes 153 passing through the multi-channel module 154 are positioned at the edge of one side of the drawing sheet 134 far away from the substrate, so that the coating liquids are spread between the substrate 10 and the drawing sheet 134 by using the siphon action.
Preferably, the frame 17 is provided with a first vertical surface, a second vertical surface and a horizontal fixing surface, the horizontal fixing surface is used for fixing the frame 17 on a position needing to be fixed, such as an optical plane, and the first vertical surface and the second vertical surface are arranged at two ends of the horizontal fixing surface. Standard screw holes and shaft through holes are uniformly distributed on the first vertical surface and are used for fixing the microscopic observation device 16, the temperature control base station unit 12, the base material conveying device 14 and the like; the shaft through hole is used for passing a transmission shaft of the substrate transfer device 14 and the like, and the standard screw hole is used for fixing the same. The middle part of the top end of the first vertical surface is reserved with a rectangular opening for the coating unit moving device 11 and the coating unit 13 to move in the Z-axis direction. The fixing base 111 of the coating unit moving device 11 is fixed to the second vertical surface, and in order to improve the stability of the frame 17, it is preferable that the second vertical surface is thick at the bottom and thin at the top, and the cross-sectional shape on the plane formed by the Z axis and the Y axis is a right trapezoid. In order to improve the stability of the first vertical surface, two ends of the first vertical surface, which are connected with the horizontal fixing surface, are provided with triangular plates.
For coating liquid materials that are unstable in air and have special requirements for environmental cleanliness, the continuous coating system 1 may be further provided with a shield 18, the shield 18 housing the frame 17 and devices on the frame 17 therein, and continuous coating is achieved by introducing an inert atmosphere and installing a high efficiency filter in the shield 18.
The continuous coating system 1 also includes an electrical system 19 for controlling the programmed movement of the coating unit 13 and the substrate transport device 14. The electric displacement table 112 and the electric rotation table 113 of the coating unit moving device 11 are controlled by the electric system 19, and can drive the coating unit 13 to move so that the drawing sheet 134 forming a certain angle with the horizontal is rapidly close to and away from the surface of the substrate 10 and forms a required angle and distance with the substrate 10. The electric system 19 includes a controller and a driver, and realizes high-precision motion control and positioning by program control, including the moving speed and the stroke of the electric translation stage, the electric rotation stage 113 and the substrate transport device 14, and the advancing speed and the liquid supply amount of the liquid supply device 15.
Through program setting, the electric system 19 is used for controlling the coating unit moving device 11 to realize adjustment of the coating unit 13 in the vertical direction and the horizontal angle, so that a required height and an angle are formed between the traction sheet 134 and the flexible base material 10, the coating liquid provided by the liquid supply device 15 is driven to coat on the continuous flexible base material 10 conveyed to the temperature control base station unit 12 by the base material conveying device 14 at a program control speed, and the temperature control module 121 is used for realizing rapid and efficient large-area preparation of a coating film, wherein the thickness and the appearance of the coating film can be optimally regulated and controlled.
A coating method using a continuous coating system 1, comprising the steps of:
step 1, before the coating process begins, the base material 10 is kept in a tensioning state, the horizontal adjusting disc 132 of the coating unit 13 is manually adjusted to enable the traction sheet 134 of the coating unit to be in a horizontal state, and under the coordination of the microscopic observation device 16, the electric system 19 precisely controls the electric rotating table 113 and the electric displacement table 112 on the coating unit moving device 11 through programs, so that the traction sheet 134 of the coating unit 13 reaches and is kept at a position which is at a specific interval from the flexible base material 10 at a required angle;
step 2, the liquid supply device 15 conveys the coating liquid to the edge of one end of the drawing sheet 134 far away from the base material according to the set program parameters (screw rod propelling speed), and the coating liquid is spread between the base material 10 and the drawing sheet 134 by means of siphon action;
and 3, controlling the base material conveying device 14 to stably convey the base material 10 at a constant speed through the electric system 19, and heating the base material 10 and the coating liquid to a set temperature for high-efficiency film formation of the coating liquid through the temperature control module 121 when the base material 10 passes through the temperature control base station unit 12 below the coating unit 13, so that the coating film is prepared quickly, efficiently and in a large area.
It should be noted that the optimal preparation of the coating film thickness and morphology can be realized by comprehensively utilizing the parameters of the solvent and the concentration of the coating liquid, the angle and the height of the drawing sheet 134, and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A continuous coating system is characterized by comprising a frame, a coating unit, a liquid supply device, a coating unit moving device, a temperature control base station unit and a base material conveying device, wherein the coating unit moving device, the temperature control base station unit and the base material conveying device are arranged on the frame;
the substrate conveying device is used for conveying a substrate; the liquid supply device provides coating liquid for the base material;
the coating unit is arranged on the coating unit moving device, and the coating unit moving device is used for controlling the distance and the angle between the coating unit and the base material; the coating unit controls the thickness and the appearance of a coating film by applying shearing force to the coating liquid; the coating unit comprises a horizontal adjusting disc and a traction sheet, wherein the horizontal adjusting disc is used for adjusting a pitch angle so as to ensure the level of the initial position of the traction sheet;
the temperature control base station unit is used for controlling the temperature of the base material and promoting the curing of the coating liquid.
2. The continuous coating system of claim 1, wherein the coating unit moving means includes a fixed base fixed to the frame, a motorized displacement table provided on the fixed base, and a motorized rotary table provided on the motorized displacement table; the coating unit is disposed on the electric rotary table.
3. The continuous coating system of claim 2, wherein the coating unit further comprises a T-connector and a vacuum suction disc;
the vacuum suction disc is arranged below the horizontal adjusting disc and is matched with the pump to fix the traction sheet; the horizontal adjusting disc is connected with a T-shaped connecting piece, and the T-shaped connecting piece is fixed on the electric rotating table.
4. The continuous coating system of claim 1, wherein the draw sheet is a planar structure having at least one straight edge for applying shear to the coating fluid.
5. The continuous coating system of claim 1, wherein the horizontal adjustment pan comprises a fixed plate, an adjustment member, and a first fixing member;
one end of the fixing plate is connected with the T-shaped connecting piece, and the other end of the fixing plate is connected with the adjusting plate;
the adjusting plate is arranged below the fixing plate, one angle of the fixing plate and one angle of the adjusting plate are fixed by the first fixing part, and the adjusting part is lifted away from other one or more angles of the adjusting plate to adjust the pitch angle of the adjusting plate.
6. The continuous coating system of claim 1, wherein the temperature-controlled base unit comprises a temperature-controlled module, a horizontal base, a lifting mechanism, a horizontal movement adjusting mechanism, and a support;
the temperature control module is fixed on a horizontal base platform through a second fixing piece, the horizontal base platform is fixed on the lifting mechanism, the lifting mechanism is fixed on the horizontal adjusting mechanism, the horizontal adjusting mechanism is fixed on a support, and the support is fixed on the frame.
7. The continuous coating system of claim 1, wherein the substrate transfer device comprises a first rotating roller for winding and a second rotating roller for unwinding; first rotatory roller and the rotatory roller of second all are provided with the fixed inserted sheet structure of jackscrew that is used for fixed substrate tip.
8. The continuous coating system according to claim 1, further comprising a microscopic observation device for observing the position of the coating unit and the formation of the coating film.
9. The continuous coating system of claim 1, further comprising a shield for keeping the environment clean.
10. A coating method using the continuous coating system of claims 1-9, comprising the steps of:
step 1, before the coating process starts, the base material is kept in a tensioning state, a horizontal adjusting disc of a coating unit is manually adjusted to enable a traction sheet of the coating unit to be in a horizontal state, and an electric system accurately controls an electric rotating table and an electric displacement table on a coating unit moving device through a program under the coordination of a microscopic observation device to enable the traction sheet of the coating unit to reach and keep a position which is away from a flexible base material by a set interval at a required angle;
step 2, the liquid supply device conveys the coating liquid to the edge of one end of the drawing sheet far away from the base material, and the coating liquid is spread between the base material and the drawing sheet under the siphon action;
and 3, controlling the base material conveying device to stably convey the base material in a constant speed state through an electrical system, and heating the base material and the coating liquid to a set temperature for efficient film formation of the coating liquid through a temperature control module when the base material passes through the temperature control base station unit below the coating unit, so that the preparation of the coating film is realized.
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