CN108001062A - It is a kind of to repair the excessive method of large area high uniformity inkjet printing film surface fluctuating - Google Patents
It is a kind of to repair the excessive method of large area high uniformity inkjet printing film surface fluctuating Download PDFInfo
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- CN108001062A CN108001062A CN201711267822.6A CN201711267822A CN108001062A CN 108001062 A CN108001062 A CN 108001062A CN 201711267822 A CN201711267822 A CN 201711267822A CN 108001062 A CN108001062 A CN 108001062A
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- film
- inkjet printing
- large area
- repair
- temperature
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
Abstract
The excessive method of large area high uniformity inkjet printing film surface fluctuating is repaired the invention discloses a kind of.This method is to be heat-treated the film of inkjet printing under the conditions of 100~200 DEG C, film normal is repaired in the thickness evenness of printing direct of travel.The large area film liquid drop boundary prepared using gelation process is repaired in the present invention, the method heated using simple thermal station, by raising temperature, control heating time, make film normal in printing direct of travel thickness evenness be improved significantly, solve using can gelation ink heat substrate on depositing large-area film when, there are surface with the periodic undulations of vertical print wire direction it is excessive the problem of, and the upper limit value of rise temperature is determined by micrograph, to ensure the high performance realization of inkjet printing film.
Description
Technical field
It is more particularly to a kind of to repair large area high uniformity inkjet printing the present invention relates to printed electronic device preparation field
The excessive method of film surface fluctuating.
Background technology
Existing inkjet printing film morphology control technology, more suppression based on to single drop " coffee ring " effect, makes to do
Drop pattern after dry changes.Under the premise of drop three-phase tufted, drop edge solvent evaporation amount is much larger than its liquid
Volume Loss amount, therefore solvent forms export-oriented capillary flow, solute is assembled at edge, formed from central area to edge supplement
" coffee ring ".Its control methods is a variety of, including by varying ink composition, ground state and increase special installation, is being formed
Each process suppress and eliminate " coffee ring "：(a) regulate and control ink chemistry and composition, such as increase surfactant, 12 sulphur
Alcohol, higher boiling low surface tension solvent, high-molecular gel, or even change solute shape；(b) base treatment, such as surface hydrophobicity, base
Bottom cools down (17 DEG C), pre-patterning and electrowetting；(c) ancillary equipment, such as adds evaporation shield and immersion with micropore
The capillary needle point of drop；(d) rapid curing, such as by photon sintering technology control solidification time in millisecond even microsecond rank.
Due to the solute transport between drop, for the control methods of single droplet drying rear film uniformity, it is difficult to directly
Applied to large area film inkjet printing.It is that solute transport is goes out between suppressing drop to have a kind of effective mode at present
Point is sent out, the drying pattern of single drop is taken into account, by the way of print procedure ink inside gelation, finally realizes that large area is uniform
Property film ink-jet printing, it is high performance to inkjet printing film realize have important references value.
Printed for non-contact inkjet, ink viscosity is relatively low, therefore is directed to single drop " coffee ring " effect suppression side
Method, it regulates and controls printing curve pattern and is only limitted to point, line.In addition, in many " coffee ring " regulation and control methods, and not all method
It may be used to the Combination Design of more drops, such as print suitable figure in hydrophobic or low-surface-energy substrate and can more be stranded
It is difficult.Using can gelation ink printed in heating substrate, effective realize that large area inkjet printing is thin although a kind of
The method of film uniformity, but there are film surface with the periodic undulations of vertical print wire direction it is excessive the problem of.
The content of the invention
The shortcomings that it is an object of the invention to overcome the prior art and deficiency, there is provided one kind repairs the spray of large area high uniformity
The excessive method of black printing thin film surface undulation.
The purpose of the present invention is achieved through the following technical solutions：One kind repairs large area high uniformity inkjet printing film table
The excessive method of face fluctuating, the film of inkjet printing is heat-treated under the conditions of 100~200 DEG C.
The film is large area film；The large area film preferably prepared using gelation process；More preferably
The film being prepared via a method which：
(1) printer prepares：Using contactless point spray formula print system；
(2) substrate prepares：Substrate is positioned in cleaning agent and is cleaned by ultrasonic, is dried；
(3) ink prepares：Prepare solvent and ink；
(4) film printing and drying：Set print parameters to carry out inkjet printing with figure, then the film after printing is placed on
Heat the substrate and be dried, obtain film.
Contactless point spray formula print system described in step (1) is preferably the heatable contactless point spray formula of substrate
Print system.
The maximum temperature of the substrate is >=60 DEG C.
Printer described in step (1) is preferably ink-jet printer DMP-2831.
Cleaning described in step (2) is to be cleaned successively with isopropanol, acetone, deionized water and isopropanol.
The time of cleaning described in step (2) is preferably 5~10min.
The boiling point of solvent described in step (3) is 150~200 DEG C, and viscosity be 6~10cp, surface tension is 20~-
30dyne/cm, sintering temperature are 120~200 DEG C, and gelling temperature is 80~90 DEG C.
Ink described in step (3) is preferably silver ink water；More preferably silver ink water FA-01.
The solvent that solvent described in step (3) is filtered preferably by 0.22~0.45 μm of filtering head.
The nozzle temperature that inkjet printing is carried out described in step (4) is preferably 30~60 DEG C.
The temperature heated the substrate described in step (4) is preferably 50~60 DEG C.
Print parameters described in step (4) are preferably：Nozzle diameter is 16 μm, injection rate 2m/s, ink droplet spacing
For 35 μm.
Figure described in step (4) can be the figure of arbitrary size arbitrary shape；Preferably 8cm × 8cm is square.
Film described in step (4) is preferably 8cm × 8cm film squares.
The heat treatment be preferably using thermal station (simple thermal station) heat by the way of be heat-treated, make film normal in
The thickness evenness of printing direct of travel is repaired.
The temperature of the temperature of the heat treatment is preferably 100~180 DEG C.
The time of the temperature of the heat treatment is preferably 30min.
The present invention is had the following advantages relative to the prior art and effect：
1st, the present invention is a kind of new technology using gelation process inkjet printing large-area uniformity film, is burnt using heat
The peering reparation in its surface uniformity also belongs to a kind of new exploration.Solve using can gelation ink heating base
On bottom during depositing large-area film, there are surface with the periodic undulations of vertical print wire direction it is excessive the problem of.In the present invention
The large area film liquid drop boundary prepared using gelation process is repaired, using simple thermal station heating means, passes through liter
High-temperature, controls heating time, make film normal in printing direct of travel thickness evenness be improved significantly, and by micro-
The upper limit value that piece determines rise temperature is taken into consideration, to ensure the high performance realization of inkjet printing film.
2nd, after large area film of the present invention using gelation process preparation, carried out using heat treatment mode perpendicular to printing
The uniformity of film reparation of direct of travel, is embodied in the rise and the control of heating time of heating-up temperature, raises temperature
Upper limit value depends on the realization of printing thin film function.
Brief description of the drawings
Cross Section Morphology figure when Fig. 1 is the film using the printing of existing ink-jet print system after single droplet drying；Its
In, figure a is " coffee ring ", and figure b is uniform film；C represents ink, substrate and equipment regulation process.
Fig. 2 be single inkjet printing drop under substrate heating condition gelation and perpendicular to printing direct of travel, two
The schematic diagram of adjacent drops；Wherein, it is single inkjet printing drop gelation to scheme a：1 is substrate, and 2 be drop, and 3 be complete gel
The region of change；It is perpendicular to printing direct of travel, two adjacent drops schematic diagrames to scheme b：4 drip for latter dropping liquid, and d is contour completion, e
Ended for flowing.
Fig. 3 is perpendicular to printing direct of travel, and liquid drop boundary raises variation diagram with temperature.
Fig. 4 is the process flow chart repaired to inkjet printing film.
Fig. 5 is the high uniformly film ink-jet printing preparation flow schematic diagram of large area；Wherein, a is showing for ink jet printing process
It is intended to；B is the schematic diagram of film drying process；C is the schematic diagram after film drying；D is aftertreatment technology to print wire interface
The schematic diagram repaired.
Fig. 6 is film square (8cm × 8cm) surface topography map and partial enlarged view；Wherein, the table that A is film square is schemed
Face shape appearance figure；A~e is schemed for printing thin film surface topography enlarged drawing (10 times of amplification) everywhere.
Fig. 7 is inkjet printing film surface appearance and microcosmic SEM figures after temperature change；Wherein, ink-jet when A is 100 DEG C is schemed
Printing thin film surface topography map；Inkjet printing film surface appearance figure when figure B is increased to 140 DEG C for temperature；Scheming a~c is respectively
The microcosmic SEM figures of 100 DEG C, 140 DEG C and 180 DEG C inkjet printing films；F represents rise temperature.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment 1
1st, Cross Section Morphology such as Fig. 1 after single droplet drying when existing ink-jet print system and method printing thin film is utilized
Shown, printing " the coffee ring " of formation can be regulated and controled by ink, substrate and equipment, but be difficult to directly apply to large area
Film ink-jet prints.Using can gelation ink printed in heating substrate, effective realize large area although a kind of
The method of inkjet printing uniformity of film, but asked there are film surface as the periodic undulations of vertical print wire direction is excessive
Topic.The gelation under substrate heating condition of single drop, and perpendicular to printing direct of travel, two adjacent drops schematic diagrames are as schemed
Shown in 2：
Fig. 2 a are single inkjet printing drop gelation；In figure：1 is substrate, in drop inkjet printing and drying process
Keep 50~60 DEG C of constant temperature；2 be drop；3 be the region of complete gelation.It is dense that drop generation gelation needs solute to reach gel
C (gel strength and drop evaporation speed, local temperature are all related) is spent, drop edge region solvent steams under substrate heating condition
It is fast to send out speed, solute quickly reaches gel strength, and fringe region flowing stops, and prevents fluid from drop centered position to margin location
Put migration.Under the machining function, produce three and advantage is printed to large area high uniformity film ink-jet：
(1) can gelation ink in evaporation process, raised with temperature, " coffee ring " effect is suppressed, therefore substrate
Heating contributes to the pattern of its single drop to control at the same time；
(2) after gelation makes the complete gelation of drop, solute is near gel strength everywhere, ensure that solute concentration
Uniformity；
(3) drop is from marginal position to center progressively gelation, and fluid is most of by border between making adjacent drops
Stop but still there be reparation of the small portion of fluid flowing for borderline region.
Fig. 2 b are that 4 drip for latter dropping liquid in figure perpendicular to printing direct of travel, two adjacent drops schematic diagrames.The state is sent out
It is born in latter dropping liquid drop just to contact with substrate and reach equilibrium state, 3 (regions of complete gelation), which are played, at this time suppresses adjacent
Fluid flows between drop, but still there is reparation of the small portion of fluid flowing for borderline region；Base reservoir temperature is kept
50~60 DEG C of constant temperature, temperature is too low, then the previous drop not yet abundant gelation of drop edge after latter drop drop contact substrate, temperature
It is too high, make thickness very little after previous drop drop edge gelation, using when flow that border is gentle between cut-off and drop to be most preferably warm
Degree.But in practical operation, little higher base reservoir temperature is generally required, to ensure that fluid flowing is fully pressed down between drop
System, it causes problem (Fig. 3 is that liquid drop boundary is raised with temperature to be changed perpendicular to printing direct of travel) as shown in Figure 3, is unfavorable for
The realization of large area film high uniformity.
2nd, due to using can gelation ink realize the flow complexity of large area high uniformity inkjet printing film, in order to
Optimum results are obtained, generally require to characterize to uniformity of film from ink composition optimization, print conditions and technology optimization of drying, root
Feed back to the improvement to material and technology again according to characterization result, so repeatedly, its process is as 1. shown such as route in Fig. 4, expends big
The material and time cost of amount.If can be repaired to inkjet printing film, material and time cost can be reduced, its mistake
Journey is as 2. shown such as route in Fig. 4.
The present invention is by the way of simple thermal station sintering, by improving heating condition, you can film surface is repaiied
Multiple, realize high performance to inkjet printing film has important references value.The high uniform film ink-jet of large area as shown in Figure 5
Printing preparation flow prepares film, and a is ink jet printing process in figure；B is film drying process；C is print wire after film drying
Interface is clear；D repairs print wire interface for aftertreatment technology, obtains high flat film；Specifically preparation flow is：
(1) printer prepares：Contactless point spray formula print system (printer model DMP-2831), substrate can add
Heat, maximum temperature Ts>=60 DEG C (in order to ensure that gel occurs, it is necessary to select the printer with heating efficiency, and heat temperature
Degree can not be too small, comes to prevent droplet coalescence not as good as hair gelation).
(2) substrate prepares：By substrate be sequentially placed in different cleaning agent (be respectively isopropanol, acetone, deionized water,
Deionized water, isopropanol) in, and 5~10min is shaken using ultrasonic cleaner respectively, drying is stand-by.
(3) ink prepares：The boiling point of solvent is 150~200 DEG C, and viscosity be 6~10cp, surface tension is 20~-
30dyne/cm, sintering temperature are 120~200 DEG C；Gelling temperature is 80~90 DEG C, can pass through 0.22~0.45 μm of filtering head
Filtering；Ink used is silver ink water (FA-01, FENGHUA ADVANCED TECHNOLOGY).
(4) film printing and drying：Setting print parameters, (nozzle diameter is 16 μm, injection rate 2m/s, ink droplet spacing
For 35 μm) and figure, substrate temperature is 50~60 DEG C, and nozzle temperature is 30~60 DEG C, and preset pattern is square for 8cm × 8cm, beats
Print rear film, which is placed on to heat the substrate, to be dried (substrate temperature remains unchanged).
According to process above step using can gelation ink inkjet printing 8cm × 8cm film squares on the glass sheet.3D
Surface topography photo shows (see Fig. 6), and thickness evenness is high everywhere for the printing thin film, but its surface undulation may be at tens nanometers
Left and right, borderline region need further to be repaired.
(5) aftertreatment technology：Sintered using thermal station, temperature is 100~200 DEG C, time 30min.
Using simple thermal station heating means, by raising temperature, heating time is controlled, makes film normal in printing traveling side
To thickness evenness be improved significantly, and by micrograph determine rise temperature upper limit value, to ensure inkjet printing
The high performance realization of film.Fig. 7 is inkjet printing film surface appearance and microcosmic SEM photograph (figure a~c difference after temperature change
For the microcosmic SEM figures of 100 DEG C, 140 DEG C and 180 DEG C inkjet printing films；F represents rise temperature), show temperature rise to film
Surface improves perpendicular to the thickness evenness of printing direct of travel has remarkable result, but is learnt from SEM photograph, further rise
Temperature can cause microporosity to raise, and cause printing thin film electric property to decline.Therefore, it is to the restorative procedure of film surface
In certain temperature range, temperature is raised, and adjust corresponding heating time.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention and from above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, it is characterised in that：By ink-jet
The film of printing is heat-treated under the conditions of 100~200 DEG C.
2. according to claim 1 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：The time of the temperature of the heat treatment is 30min.
3. according to claim 1 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：The heat treatment is to be heat-treated by the way of thermal station heating；The temperature of the temperature of the heat treatment
For 100~180 DEG C.
4. according to claim 1 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：The film is large area film, is prepared via a method which to obtain：
(1) printer prepares：Using contactless point spray formula print system；
(2) substrate prepares：Substrate is positioned in cleaning agent and is cleaned by ultrasonic, is dried；
(3) ink prepares：Prepare solvent and ink；
(4) film printing and drying：Set print parameters to carry out inkjet printing with figure, then the film after printing is placed on heating
It is dried on substrate, obtains film.
5. according to claim 4 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：
The boiling point of solvent described in step (3) is 150~200 DEG C, and viscosity be 6~10cp, surface tension is 20~-
30dyne/cm, sintering temperature are 120~200 DEG C, and gelling temperature is 80~90 DEG C.
6. according to claim 4 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：
The nozzle temperature that inkjet printing is carried out described in step (4) is 30~60 DEG C；
The temperature heated the substrate described in step (4) is 50~60 DEG C.
7. according to claim 4 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：
Contactless point spray formula print system described in step (1) is the heatable contactless point spray formula printing system of substrate
System；The maximum temperature of the substrate is >=60 DEG C.
8. according to claim 4 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：
Cleaning described in step (2) is to be cleaned successively with isopropanol, acetone, deionized water and isopropanol；
The time of cleaning described in step (2) is 5~10min.
9. according to claim 4 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：
Print parameters described in step (4) are：Nozzle diameter is 16 μm, injection rate 2m/s, ink droplet spacing are 35 μm.
10. according to claim 4 repair the excessive method of large area high uniformity inkjet printing film surface fluctuating, its
It is characterized in that：
Film described in step (4) is 8cm × 8cm film squares.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114475036A (en) * | 2022-02-17 | 2022-05-13 | 北京航空航天大学 | Method for improving ink-jet printing quality based on liquid drop boiling |
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