CN104907238A - Method for preparing coating on surface of hydrophobic insulating layer - Google Patents
Method for preparing coating on surface of hydrophobic insulating layer Download PDFInfo
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- CN104907238A CN104907238A CN201510223964.7A CN201510223964A CN104907238A CN 104907238 A CN104907238 A CN 104907238A CN 201510223964 A CN201510223964 A CN 201510223964A CN 104907238 A CN104907238 A CN 104907238A
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Abstract
The invention discloses a method for preparing a coating on the surface of a hydrophobic insulating layer. The method includes the following steps that the hydrophobic insulating layer is prepared on a base material; coating paint is added to the hydrophobic insulating layer; electrowetting processing is conducted, that is, proper voltage is applied on the position between the base material and the coating paint, the electrowetting effect is utilized, and the surface of the hydrophobic insulating layer becomes wettable; coating is conducted. The method can be used for preparing coatings on the surface of various hydrophobic insulating layers, such as, electrowetting display, micro-fluidic chips, electrowetting sensing, electrowetting micro lens and electrowetting micro electro mechanical system and the application range of hydrophobic insulating materials can be greatly expanded.
Description
Technical field
The present invention relates to a kind of method preparing film on drain insulating layer surface.
Background technology
Hydrophobic insulation material is widely used in field of photoelectric devices, as electric moistening display part, micro-fluidic chip etc.Hydrophobic insulation material itself has the characteristics such as good hydrophobic and insulation, is therefore prepared into drain insulating layer with hydrophobic insulation material and can plays the intrinsic characteristic in its surface.But just because of the hydrophobic property on drain insulating layer surface, when we need to carry out technique as film in its surface, because the surface energy of drain insulating layer is low, the coating higher than its surface energy is difficult to form film in its surface.
Traditional method carries out surface modification to drain insulating layer, as the method such as oxygen plasma or UV ozone process drain insulating layer surface, make it become hydrophilic to apply, it is hydrophobic that method finally by high-temperature hot backflow makes it revert to, but these methods are all effects on surfaces carried out modification, had a certain impact to material surface, be difficult to ensure that the hydrophobic property on its surface can be recovered completely, therefore have impact on material itself and there is superior hydrophobic property, limit its application.
Electricity is wetting as a kind of microfluid phenomenon, has been widely used in various fluid and photoelectric field.The wetting voltage referred to by changing between drop and insulated substrate of electricity, changes the wetability of drop on substrate, namely changes contact angle, make the phenomenon of drop generation deformation, displacement.
For solving the problem at hydrophobic insulation material surface coating, the present invention looks for another way, and utilizes electrowetting technology to make hydrophobic surface become wettable, when wetting, carry out film, thus solves the problem of the difficult film of hydrophobic surface.
Summary of the invention
For solving the deficiencies in the prior art, a kind of electrowetting technology that utilizes is provided to prepare the method for film on drain insulating layer surface.
The solution that the present invention solves its technical problem is: a kind of method preparing film on drain insulating layer surface, comprises the following steps:
Drain insulating layer prepared by base material;
Drain insulating layer is added and is coated with coating, described painting coating comprises electrically-conducting paint and non-/ weak inductive coating; When painting coating is electrically-conducting paint, directly add painting coating to drain insulating layer on the surface; When be coated with coating be non-/ weak inductive coating time, painting coating in add conductive materials, make it conduct electricity, carry out electric wettability treatment so that follow-up;
Carry out electric wettability treatment: between base material and painting coating, apply suitable voltage, utilize electrowetting effect, make drain insulating layer surface become wettable;
Coating: form coating by coating processes, the voltage keeping base material in coating procedure and be coated with between coating.
As preferred embodiment, described base material is the substrate of ITO coating, the substrate of the coat of metal or TFT substrate; Described substrate is glass, silicon chip, macromolecule membrane, plastic sheeting, metallic plate or block.
As preferred embodiment, described drain insulating layer is prepared by spin coating/printing coating-baking process.
As preferred embodiment, the contact angle on described drain insulating layer surface is 90-160 °.
As preferred embodiment, the thickness of described drain insulating layer is about 500-1500nm.
As preferred embodiment, be coated with the viscosity of coating at 1-1000 mPa.s.Further preferably, described painting coating is selected from any one in photoresist, conductive silver paste, polyurethane, polyimides, epoxy resin, conductive glue, conductive polymer solution and conductive rubber dispersion.If non-/ weak inductive coating, the conductive materials wherein added can be by those skilled in the art as required, solid, liquid substance that selection can be conducted electricity add, do not affect other performances of film, as being the mixture, conducting solution, metal nano material etc. of a kind of ionic liquid or several ionic liquid, as required, can the interpolation used in combination by dissimilar conductive materials.
Further preferably, adjuvant can be added with in described painting coating, be convenient to coordinate adjustment dope viscosity, described adjuvant can be any one in TWEEN Series, wire tray series, glycerine, alcohols, ethers, ketone, alkanes, alkynes class, olefines and ester class material.
As preferred embodiment, described coating processes be line rod coating, slot coated, spin coating or print in any one.
The invention has the beneficial effects as follows: the present invention realizes directly applying coating on drain insulating layer surface by electrowetting technology.Particularly, utilize drain insulating layer electro-wetting property inherently, in conjunction with drain insulating layer material and thickness, the electric conductivity of coating, viscosity and droplet size, hydrophobic surface is made to become wettable by applying suitable voltage, thus the problem that solution coating cannot apply due to wetability difference in coating procedure.
Further, the method technique is simple, cost is low, solves the complex process such as plasma or UV ozone process and the high problem of cost, reduces the impact on hydrophobic material surface.
Further, the method and existing all kinds of paint-on technique (line rod be coated with, spin coating, printing etc.) compatibility is good, all kinds of paint-on technique is improved a little and can apply, as line rod rubbing method making alive on the line rod of conduction, spin coating rule can add Portable mobile power source etc. under the tray bottom of spin-coating equipment, applicability is strong, has stronger generalization.
The present invention can be used for the painting film preparation on various drain insulating layer surface, as electricity wetting display, micro-fluidic chip etc., greatly can expand the range of application of hydrophobic insulation material.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described.Obviously, described accompanying drawing is a part of embodiment of the present invention, instead of whole embodiment, and those skilled in the art, under the prerequisite not paying creative work, can also obtain other designs and accompanying drawing according to these accompanying drawings.
Fig. 1 is the process chart preparing film at drain insulating layer surface electrical dampening of the present invention;
Fig. 2 is electrically-conducting paint of the present invention contact angle change schematic diagram before and after drain insulating layer on the surface making alive;
Fig. 3 is rod coating edge coating material limit making alive process schematic of reaching the standard grade on drain insulating layer surface of the present invention;
Fig. 4 is that the one-component that the embodiment of the present invention 1 provides is coated with the coating contact angle schematic diagram corresponding when a certain voltage is issued to wettable;
Fig. 5 be the painting coating of the different conductances of two kinds of components that the embodiment of the present invention 2 provides under different voltage, contact angle schematic diagram corresponding when reaching wettable;
Fig. 6 is that three kinds of components that the embodiment of the present invention 3 provides are coated with the coating contact angle schematic diagram corresponding when a certain voltage is issued to wettable.
Description of reference numerals in Fig. 3:
Non-conductive or the electrically conductive substrates of 1-; 2-conductive layer; 3-drain insulating layer; 4-is coated with coating; 5-coating; 6-spreading rod.
Detailed description of the invention
Clear, complete description is carried out, to understand object of the present invention, characteristic sum effect fully below with reference to embodiment and the accompanying drawing technique effect to design of the present invention, concrete structure and generation.Obviously; described embodiment is a part of embodiment of the present invention, instead of whole embodiment, based on embodiments of the invention; other embodiments that those skilled in the art obtains under the prerequisite not paying creative work, all belong to the scope of protection of the invention.Each technical characteristic in the invention, can combination of interactions under the prerequisite of not conflicting conflict.
With reference to Fig. 1-3, a kind of method preparing film on drain insulating layer surface of the present invention, comprises the following steps:
Step S100, base material is prepared drain insulating layer 3.
Usual base material is made up of non-conductive or electrically conductive substrates 1 and conductive layer 2, can prepare drain insulating layer 3 thereon, as conductive bases such as ito glass or TFT glass after cleaning; Preferably, be ito glass.
Drain insulating layer 3 material is any other low surface energy polymeric, as noncrystal fluoropolymer AF1600, AF1600X or AF1601 etc.Preferably, drain insulating layer 3 obtains through the baking process of spin coating or printing process and postorder; The thickness of drain insulating layer 3 is about 500-1500nm, and contact angle size is for being 90-160 °; Further preferably, surface contact angle is 110 °.
Step S200, drain insulating layer 3 is added and is coated with coating 4.
Being coated with coating 4 can be any coating that may be used for film, comprises electrically-conducting paint and non-/ weak inductive coating; If being coated with coating 4 is electrically-conducting paint, itself has electric conductivity, it directly can be added on above drain insulating layer; If being coated with coating 4 is non-/ weak inductive coating, namely be coated with coating 4 and do not possess electric conductivity or poorly conductive, then can add the high conductivity material not affecting film serviceability wherein makes it possess electric conductivity, so that postorder can utilize electrowetting effect to apply.
Be coated with coating 4 also to need to configure the viscosity be applicable to, viscosity is excessive, and voltage cannot drive simultaneously.The contact angle of coating on hydrophobic surface when the viscosity be applicable to both had reduced non-making alive, also facilitates during making alive and drives drop; Preferably, the viscosity being coated with coating 4 is 1-1000 mPa.s.
Further preferably, described painting coating 4 is selected from any one in photoresist, conductive silver paste, polyurethane, polyimides, epoxy resin, conductive glue, conductive polymer solution and conductive rubber dispersion.Photoresist comprises positive photoresist and negative photoresist, can be conduction, also can right and wrong/weakly conducting, polyurethane, polyimides and epoxy resin also can be conduction or non-/ weakly conducting, if non-/ weak inductive coating, the conductive materials wherein added can be by those skilled in the art as required, the solid that selection can be conducted electricity, liquid substance adds, do not affect other performances of film, as being mixture (as: [BMIM] BF4 of a kind of ionic liquid or several ionic liquid, [BMIM] PF6, nitric acid ethylamine (EAN) etc., conducting solution (as: water-soluble salt solution, oil-soluble conducting liquid, ionic surfactant solution etc.), metal nano material (as: nano particle, nano wire, nanometer rods etc.) etc., as required, can the interpolation used in combination by dissimilar conductive materials.
Further preferably, adjuvant can also be added with in painting coating 4, be coated with the viscosity of coating 4 for auxiliary adjustment, adjuvant can be any one in TWEEN Series (comprising Tween-20, Tween-80 etc.), wire tray series (comprising wire tray 20, wire tray 40, wire tray 60, wire tray 80 etc.), glycerine, alcohols, ethers, ketone, alkanes, alkynes class, olefines and ester class material.
Step S300, carries out electric wettability treatment.
Between painting coating 4 and base material, apply suitable voltage, utilize electrowetting effect, make drain insulating layer 3 surface become wettable.
The form of painting coating 4 comparatively hydrophilic as making alive is last on hydrophobic surface is as shown in Figure 2 (A) shows, poor owing to being coated with the wetability of coating 4 on drain insulating layer 3 surface, is coated with coating 4 liquid and is greater than 90 ° at the initial contact angle of hydrophobic surface; When applying the voltage be applicable between painting coating 4 and base material, drain insulating layer 3 surface becomes wettable under the effect of voltage, and the form of coating is as shown in Fig. 2 (B), and contact angle is less than 90 °, can apply.The contact angle of coating on hydrophobic surface of different materials varies in size, and the contact angle generally before non-making alive is between 90-120 °, and the contact angle after making alive can be less than 90 °, shows surperficial wettable effect, therefore can carry out thin film coated.The size of contact angle is by executing alive size and being coated with the decisions such as the electric conductivity of coating 4 and viscosity.
Described suitable voltage is according to drain insulating layer 3 material used and thickness etc., and the factor such as size that is coated with the viscosity of coating 4, electric conductivity and drop determines.It is different that different hydrophobic materials reaches the wettable required voltage swing in surface, and the thickness of drain insulating layer 3 is thicker, generally needs to reach wettable required voltage larger; The viscosity of coating is larger, and the contact angle before corresponding non-making alive is less, but corresponding required voltage driven is also larger, and therefore the selection of viscosity is very important; Be coated with coating 4 thicker, required wettable voltage is also larger; The electric conductivity being coated with coating 4 is better, and required wettable voltage is lower, if being coated with coating 4 is desirable coating, namely resistance is zero, then add any one less voltage and just can make coating drawout, coating, sprawling uniform force in process, there will not be shrinkage phenomenon; If but it is poorer to be coated with coating 4 electric conductivity, required wettable voltage is higher, if coating is non-conductive, the method that then electricity is wetting just cannot change the wetability of drop on hydrophobic surface, therefore, need to add conductive materials wherein for painting coating that is nonconducting or poorly conductive, make it have electric conductivity, the method is just suitable for.
Step S400, coating.
Keeping adding all-mains between base material and painting coating 4 while, carry out coating processes and form coating 5.The paint-on technique selected can be, but not limited to line rod coating, spin coating, slot coated, printing etc., preferably, adopts the coating of line rod.
Line rod coating process schematic diagram as shown in Figure 3, paintings coating 4 is placed in drain insulating layer 3 on the surface after, apply suitable voltage being coated with between coating 4 and base material, negative pole receives conductive layer 2, and positive pole is directly received above the spreading rod 6 of conduction.In alive situation, owing to there being one deck drain insulating layer 3 between spreading rod 6 and conductive layer, which forms electric field, wetability change is there is in drain insulating layer 3 under the effect of electric field, make hydrophobic surface become wettable, be coated with coating 4 contact angle in its surface and diminish, be coated with the contact angle of coating 4 on hydrophobic surface less, more can soak drain insulating layer 3 surface, thus more easily form coating.In coating procedure, spreading rod 6 and drain insulating layer 3 relative motion, and certain pressure is applied in drain insulating layer 3, painting coating 4 blade coating open form is become certain thickness coating 5.
The solution of the present invention considers solid surface energy and electrowetting technology, the electro-wetting property intrinsic from hydrophobic surface is started with, by changing the voltage between coating and base material, change the wetability of coating on drain insulating layer surface, namely contact angle is changed, make the wettable hydrophobic surface of coating, even can sprawl on hydrophobic surface.Power up on limit in flanging coating procedure, there is the trend of expansion in coating contacts face, and namely the adhesive force of coating to the surface of solids is greater than its cohesive force, thus easy paint open form is become coating.Simultaneously by the research characteristic of hydrophobic material and thickness, and the composite factor such as the viscosity of coating, electric conductivity and droplet size, select suitable voltage, drain insulating layer surface wettability is improved greatly.In addition, also electrowetting technology is used different paint-on technique fields, all kinds of paint-on technique is done a little and improves, as line rod rubbing method making alive on the line rod of conduction, spin coating rule adds portable power source etc. under the tray bottom of spin-coating equipment, with existing paint-on technique, there is good compatibility, applicability and generalization strong.
Now for the preferably concrete method preparing hydrophilic film at hydrophobic surface, the present invention is described in more detail.
embodiment 1
1) drain insulating layer 3 is prepared.
First ultrasonic cleaning is carried out to ito glass base material, then hydrophobic coating is dripped thereon, adjusting rotary speed is 1500 r/min, spin coating obtains drain insulating layer 3, and be then put on hot plate by print and toast, temperature is 95 DEG C, time is 5min, placed by print in baking oven again and be raised to 180 DEG C of maintenance 30min from room temperature, the thickness of gained drain insulating layer 3 is about 800 nm, and contact angle is about 110 °.
2) in drain insulating layer 3, painting coating 4 is added.
Configuration is coated with coating 4, and photoresist SU-8 2000.5 itself can conduct electricity, therefore can direct film, and under temperature is 22 ± 1 DEG C of environment, recording its electrical conductivity is 4.7 μ S/cm; Then utilize liquid-transfering gun to pipette 5 μ L and be added drop-wise to drain insulating layer 3 that step 1 obtains on the surface.
3) electric wettability treatment is carried out
The present embodiment adopts line rod rubbing method to be coated with, and in this step, with conductive layer 2 for negative pole, the spreading rod 6 of conduction is positive pole, between painting coating 4 and base material, apply voltage.
When voltage is added to 80V, contact angle about 70 ° (as shown in Figure 4), can soak hydrophobic surface, apply.
4) apply
Adopt line rod rubbing method to apply, and in coating process, keep voltage constant, form coating 5.
embodiment 2
1) drain insulating layer 3 is prepared.
First ultrasonic cleaning is carried out to ito glass base material, then hydrophobic coating is dripped thereon, adjusting rotary speed is 1500 r/min, spin coating obtains drain insulating layer 3, and be then put on hot plate by print and toast, temperature is 95 DEG C, time is 5min, placed by print in baking oven again and be raised to 180 DEG C of maintenance 30min from room temperature, the thickness of gained drain insulating layer 3 is about 800 nm, and contact angle is about 110 °.
2) in drain insulating layer 3, painting coating 4 is added.
The painting coating 4 of the different conductances of configuration two kinds of components, by photoresist SU-8 3005 and ionic liquid [BMIM] BF
4be respectively 20:1,10:1,5:1 mixing according to different mass ratioes, obtain the different painting coating 4 of two kinds of components, under temperature is 22 ± 1 DEG C of environment, measures the electrical conductivity obtaining correspondence and be respectively 32.3 μ S/cm, 56.4 μ S/cm, 113.8 μ S/cm; Then utilize liquid-transfering gun to pipette 5 μ L respectively and be added drop-wise to drain insulating layer 3 that step 1 obtains on the surface.
3) electric wettability treatment is carried out
The present embodiment adopts line rod rubbing method to be coated with, and in this step, with conductive layer 2 for negative pole, the spreading rod 6 of conduction is positive pole, between painting coating 4 and base material, apply voltage.
Electrical conductivity is the painting coating of 32.3 μ S/cm: when voltage is added to 80V, and contact angle about 70 ° (as shown in Figure 5A), can soak hydrophobic surface, apply.
Electrical conductivity is the painting coating of 56.4 μ S/cm: when voltage is added to 60V, and contact angle about 70 ° (as shown in Figure 5 B), can soak hydrophobic surface, apply.
Electrical conductivity is the painting coating of 113.8 μ S/cm: when voltage is added to 40V, and contact angle about 70 ° (as shown in Figure 5 C), can soak hydrophobic surface, apply.
4) apply
Adopt line rod rubbing method to apply, and in coating process, keep voltage constant, form coating 5.
embodiment 3
1) drain insulating layer 3 is prepared.
First ultrasonic cleaning is carried out to ito glass base material, then hydrophobic coating is dripped thereon, adjusting rotary speed is 1500r/min, spin coating obtains drain insulating layer 3, and be then put on hot plate by print and toast, temperature is 95 DEG C, time is 5min, placed by print in baking oven again and be raised to 180 DEG C of maintenance 30min from room temperature, the thickness of gained drain insulating layer 3 is about 800 nm, and contact angle is about 110 °.
2) in drain insulating layer 3, painting coating 4 is added.
Configure the painting coating 4 of three kinds of component mixing, by photoresist SU-8 3050 and ionic liquid [BMIM] BF
4, [BMIM] PF
6be 10:1:1 mixing according to mass ratio, obtain the painting coating 4 of three kinds of components, under temperature is 22 ± 1 DEG C of environment, measure that to obtain its electrical conductivity be 97.4 μ S/cm; Then utilize liquid-transfering gun to pipette 5 μ L and be added drop-wise to drain insulating layer 3 that step 1 obtains on the surface.
3) electric wettability treatment is carried out
The present embodiment adopts line rod rubbing method to be coated with, and in this step, with conductive layer 2 for negative pole, the spreading rod 6 of conduction is positive pole, between painting coating 4 and base material, apply voltage.
When voltage is added to 50V, contact angle about 70 ° (as shown in Figure 6), can soak hydrophobic surface, apply.
4) apply
Adopt line rod rubbing method to apply, and in coating process, keep voltage constant, form coating 5.
Above better embodiment of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (9)
1. prepare a method for film on drain insulating layer surface, comprise the following steps:
Drain insulating layer prepared by base material;
Drain insulating layer is added and is coated with coating, described painting coating comprises electrically-conducting paint and non-/ weak inductive coating; When painting coating is electrically-conducting paint, directly add painting coating to drain insulating layer on the surface; When be coated with coating be non-/ weak inductive coating time, painting coating in add conductive materials;
Carry out electric wettability treatment: between base material and painting coating, apply suitable voltage, utilize electrowetting effect, make drain insulating layer surface become wettable;
Coating: form film by coating processes, the voltage keeping base material and be coated with between coating in coating procedure.
2. the method preparing film on drain insulating layer surface according to claim 1, is characterized in that: described base material is the substrate of ITO coating, the substrate of the coat of metal or TFT substrate; Described substrate is glass, silicon chip, macromolecule membrane, plastic sheeting, metallic plate or block.
3. the method preparing film on drain insulating layer surface according to claim 1, is characterized in that: prepare drain insulating layer by spin coating/printing coating-baking process.
4. the method preparing film on drain insulating layer surface according to claim 1, is characterized in that: the contact angle on described drain insulating layer surface is 90-160 °.
5. the method preparing film on drain insulating layer surface according to claim 1, is characterized in that: the thickness of described drain insulating layer is 500-1500nm.
6. the method preparing film on drain insulating layer surface according to any one of claim 1-5, is characterized in that: described film dope viscosity scope is 1-1000 mPa.s.
7. according to claim 6ly prepare the method for film on drain insulating layer surface, it is characterized in that: described painting coating be selected from photoresist, conductive silver paste, polyurethane, polyimides, epoxy resin, conductive glue, conductive polymer solution and conductive rubber dispersion any one; Described non-/ weak inductive coating in the conductive materials that adds be mixture, conducting solution or the metal nano material of a kind of ionic liquid or several ionic liquid.
8. the method preparing film on drain insulating layer surface according to claim 7, it is characterized in that: be added with adjuvant in described painting coating, described adjuvant is any one in TWEEN Series, wire tray series, glycerine, alcohols, ethers, ketone, alkanes, alkynes class, olefines and ester class material.
9. according to claim 1ly prepare the method for film on drain insulating layer surface, it is characterized in that: described coating processes is spin coating, the coating of line rod, slot coated, gravure, nano print, roller coat or any one in printing.
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| CN108654711A (en) * | 2018-06-07 | 2018-10-16 | 西南科技大学 | A kind of method of solid liquid interface stick-slip under reduction electric field |
| CN108766686A (en) * | 2018-06-05 | 2018-11-06 | 瑞安复合材料(深圳)有限公司 | A kind of low sheet resistance flexible insulating material and preparation method thereof |
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| CN110665552A (en) * | 2019-09-17 | 2020-01-10 | 华南师范大学 | Method and device for generating surface charge, hydrophobic insulating layer and application thereof |
| CN110711607A (en) * | 2019-09-17 | 2020-01-21 | 华南师范大学 | Method for manufacturing patterned surface charge, hydrophobic insulating film and application thereof |
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| WO2024032791A1 (en) * | 2022-08-12 | 2024-02-15 | 江苏液滴逻辑生物技术有限公司 | Thin film, digital microfluidic chip substrate and preparation method therefor |
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| CN105955335B (en) * | 2016-05-24 | 2019-01-22 | 华南师范大学 | A kind of soaking temperature controlling instruments and temperature control method based on dielectric wetting |
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| CN110711607A (en) * | 2019-09-17 | 2020-01-21 | 华南师范大学 | Method for manufacturing patterned surface charge, hydrophobic insulating film and application thereof |
| CN110711607B (en) * | 2019-09-17 | 2022-07-26 | 华南师范大学 | Method for manufacturing patterned surface charge, hydrophobic insulating film and application thereof |
| CN111234587A (en) * | 2020-03-16 | 2020-06-05 | 中南大学 | Anti-icing coating for vehicle-mounted bogie of motor train unit |
| WO2024032791A1 (en) * | 2022-08-12 | 2024-02-15 | 江苏液滴逻辑生物技术有限公司 | Thin film, digital microfluidic chip substrate and preparation method therefor |
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Application publication date: 20150916 |