CN112011204B - Fingerprint-resistant coating, terminal and preparation method - Google Patents
Fingerprint-resistant coating, terminal and preparation method Download PDFInfo
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- CN112011204B CN112011204B CN201910457914.3A CN201910457914A CN112011204B CN 112011204 B CN112011204 B CN 112011204B CN 201910457914 A CN201910457914 A CN 201910457914A CN 112011204 B CN112011204 B CN 112011204B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
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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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
Abstract
The embodiment of the invention discloses a fingerprint-resistant coating, a terminal and a preparation method, and belongs to the field of terminal products. The fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and an oleophobic area positioned in a spacing area of the oleophilic areas. The existence in oleophobic region can reduce the adhesion of fingerprints such as greasy dirt, and the existence in oleophilic region can make fingerprints such as adnexed fingerprint wherein evenly spread, and both cooperations not only can reduce the scattering effect of the fingerprint of liquid drop form, and can reduce the total area of the fingerprint of liquid film form to make under the light scattering condition and under the light reflection condition, the visibility of fingerprint obviously reduces, and the fingerprint residual degree also obviously reduces simultaneously.
Description
Technical Field
The application relates to the field of terminal products, in particular to a fingerprint-resistant coating, a terminal and a preparation method.
Background
The user hand is at the in-process with terminal surface contact such as cell-phone, panel computer, and dirty fingerprint that combines to have sebum, sweat etc. adheres to easily on the terminal surface, forms the seal of a government organization in old china, so not only can influence the whole outward appearance effect of terminal, still can influence its screen display effect. Therefore, it is necessary to reduce the visibility of the fingerprint on the terminal surface.
The prior art solves the problems by forming a fingerprint-resistant coating on the surface of a terminal, wherein the fingerprint-resistant coating can be prepared from an oleophobic material, and the formed oleophobic coating makes fingerprints difficult to adhere to the surface of the terminal so as to achieve the purpose of reducing the visual degree of the fingerprints. Or the fingerprint-resistant coating can be prepared from oleophylic materials, and the formed oleophylic coating is beneficial to forming an oil film on the surface of the terminal so as to make fingerprints unobvious.
In the course of implementing the present application, the inventors found that the related art has at least the following problems:
the oil-phobic fingerprint-resistant coating exists on the surface of the terminal in the form of micro liquid drops, so that fingerprints are easily white and foggy under the condition of light scattering, and the permeability of the surface of the terminal is influenced; the oleophilic fingerprint-resistant coating exists in the form of a liquid film, but fingerprints are still clearly visible under light reflection conditions.
Disclosure of Invention
In order to solve the problem that the oleophobic and oleophilic type fingerprint-resistant coating in the prior art has the problem of reducing the visibility of fingerprints, the embodiment of the invention provides a fingerprint-resistant coating, a terminal and a preparation method. The technical scheme is as follows:
in a first aspect, there is provided a fingerprint resistant coating comprising: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and an oleophobic area positioned in a spacing area of the oleophilic areas.
The scheme shown in the embodiment of the invention has a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas, wherein the existence of the oleophobic areas can reduce the adhesiveness of fingerprints such as oil stains and the like, the existence of the oleophilic areas can uniformly spread the attached fingerprints such as the oil stains and the like, and the combination of the oleophilic areas and the oleophilic areas can reduce the scattering effect of the fingerprints in the form of liquid drops and reduce the total area of the fingerprints in the form of liquid films, so that the visibility of the fingerprints is obviously reduced under the light scattering condition and the light reflection condition, and the fingerprint residue degree is also obviously reduced.
In one possible implementation, the area of any oleophilic region is less than 9 × 10-4mm2。
Further, the area of any oleophilic area is less than 1 x 10-6mm2。
According to the scheme of the embodiment of the invention, the area of any oleophilic area is limited as above, so that the aim of remarkably reducing the visibility of the fingerprint can be achieved.
In one possible implementation, the total area of the plurality of oleophilic areas is less than the total area of the oleophobic areas.
The scheme shown in the embodiment of the invention can ensure that the attachment amount of fingerprints such as oil stains and the like is reduced as much as possible, a small amount of residual oil drops can spontaneously enter a lipophilic area to form an oil film, the area of the oil film is correspondingly reduced, and the method is very favorable for reducing the visibility of the fingerprints
In a second aspect, there is provided a method for preparing a fingerprint resistant coating, the method comprising: providing a film forming solution for forming a fingerprint-resistant coating;
forming the fingerprint-resistant coating on a substrate by using the film-forming solution;
wherein the fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and an oleophobic area positioned in a spacing area of the oleophilic areas.
According to the scheme shown in the embodiment of the invention, the expected fingerprint-resistant coating can be obtained by the method.
In one possible implementation, the deposition solution comprises: oleophobic and lipophilic deposition solutions;
and forming the fingerprint-resistant coating on the substrate by using the oleophobic film-forming solution and the oleophilic film-forming solution through a double-source co-evaporation process.
According to the scheme shown in the embodiment of the invention, a double-source co-evaporation process is utilized to simultaneously spray the oleophobic film-forming solution and the oleophilic film-forming solution on the substrate, due to the incompatible characteristics of the oleophobic film-forming solution and the oleophilic film-forming solution, the oleophilic film-forming solution is used as a disperse phase, the oleophobic film-forming solution is used as a continuous phase, the oleophilic film-forming solution and the oleophilic film-forming solution can be spontaneously separated to form a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas.
In one possible implementation, the ratio of the areas of the oleophobic area and the oleophilic area is controlled by controlling the evaporation rates of the oleophobic deposition solution and the oleophilic deposition solution.
According to the scheme shown by the embodiment of the invention, the evaporation rate of the oleophobic area and the oleophilic area can be correspondingly controlled, so that the ratio of the evaporation amount of the oleophobic area to the evaporation amount of the oleophilic area can be correspondingly controlled.
In one possible implementation, the deposition solution comprises: the oil-repellent coating material, the oleophilic coating material and the first solvent;
and forming the fingerprint-resistant coating on the substrate by using the film forming solution through a single-source evaporation process.
According to the scheme shown in the embodiment of the invention, a single-source co-evaporation process is utilized to place a film forming solution comprising an oleophobic membrane material and an oleophilic membrane material on a substrate, due to the incompatible characteristics of the oleophobic membrane material and the oleophilic membrane material, the oleophilic membrane material is used as a disperse phase, the oleophobic membrane material is used as a continuous phase, and the oleophilic membrane material can be spontaneously separated to form a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas.
In one possible implementation, the area ratio of the oleophobic area and the oleophilic area is controlled by controlling the mass ratio of the oleophobic coating to the oleophilic coating.
According to the scheme shown in the embodiment of the invention, the ratio of the evaporation quantities of the oleophobic area and the oleophilic area can be correspondingly controlled by controlling the mass ratio of the oleophobic area and the oleophilic area, so that the area ratio of the oleophobic area and the oleophilic area can be controlled.
In one possible implementation, the deposition solution comprises: a graft copolymer having both an oleophobic group and an oleophilic group and a second solvent;
and forming the fingerprint-resistant coating on the substrate by using the film forming solution through a single-source evaporation process.
According to the scheme shown in the embodiment of the invention, the single-source co-evaporation process is utilized to spray the film forming solution on the substrate, and based on the existence of the oleophobic group and the oleophilic group in the graft copolymer with the oleophobic group and the oleophilic group, the two groups can spontaneously agglomerate to form a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas.
In one possible implementation, the area ratio of the oleophobic area and the oleophilic area is controlled by controlling the molar ratio of the oleophobic group and the oleophilic group.
In one possible implementation, the deposition solution comprises: oleophobic and lipophilic deposition solutions;
and respectively coating films on the substrate by using the oleophobic film-forming solution and the oleophilic film-forming solution through a photoetching process to form the oleophobic area and the oleophilic area.
According to the scheme shown in the embodiment of the invention, through the characteristics of the photoetching process, a plurality of oleophilic film-forming liquid coating areas corresponding to oleophilic areas and oleophobic film-forming liquid coating areas corresponding to oleophobic areas can be defined on the substrate, then oleophilic film-forming liquid is coated on the oleophilic film-forming liquid coating areas, oleophobic film-forming liquid is coated on the oleophobic film-forming liquid coating areas, and a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas are formed.
In a possible implementation manner, the distribution of the oleophobic area and the oleophilic area is controlled by controlling the structure of a mask plate adopted in the photolithography process.
In a fourth aspect, there is provided a terminal having a fingerprint resistant coating of the first aspect on a surface thereof.
According to the scheme provided by the embodiment of the invention, based on the fingerprint-resistant coating provided by the embodiment of the invention, the visibility of the fingerprint on the surface of the terminal under the light scattering condition and the light reflection condition is obviously reduced, the fingerprint residue is also obviously reduced, and the user experience and the product competitiveness are improved.
In a fifth aspect, a method for preparing a terminal is provided, where the method includes: respectively preparing a terminal main body and a terminal shell;
forming a fingerprint-resistant coating on the outer surface of the terminal housing by using the manufacturing method of the second aspect;
and assembling the terminal shell with the fingerprint-resistant coating on the terminal main body to form the terminal.
According to the scheme disclosed by the embodiment of the invention, the terminal with the fingerprint-resistant coating on the surface can be obtained, the visibility of the fingerprint of the terminal is obviously reduced, the fingerprint residue is also obviously reduced, and the improvement of user experience and product competitiveness is facilitated.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the fingerprint-resistant coating provided by the embodiment of the invention is provided with a plurality of oleophilic areas which are distributed at intervals and oleophobic areas which are positioned in the intervals of the oleophilic areas, wherein the existence of the oleophobic areas can reduce the adhesiveness of fingerprints such as oil stains and the like, the existence of the oleophilic areas can uniformly spread the attached fingerprints such as the oil stains and the like, and the combination of the oleophilic areas and the oleophilic areas can reduce the scattering effect of the fingerprints in the form of liquid drops and reduce the total area of the fingerprints in the form of liquid films, so that the visibility of the fingerprints is obviously reduced under the light scattering condition and the light reflection condition, and the fingerprint residue degree is also obviously reduced.
Drawings
FIG. 1 is a top view of a fingerprint resistant coating provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a process for preparing a fingerprint-resistant coating by using a dual-source evaporation process according to an embodiment of the present invention;
FIG. 3 is a flow chart of a process for preparing a fingerprint-resistant coating by using a single-source evaporation process according to an embodiment of the present invention;
FIG. 4 is a flow chart of a process for preparing a fingerprint resistant coating by using a photolithography process according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
In one aspect, embodiments of the present invention provide a fingerprint resistant coating, as shown in fig. 1, the fingerprint resistant coating includes: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and an oleophobic area positioned in a spacing area of the oleophilic areas.
The fingerprint-resistant coating provided by the embodiment of the invention is provided with a plurality of oleophilic areas which are distributed at intervals and oleophobic areas which are positioned in the intervals of the oleophilic areas, wherein the existence of the oleophobic areas can reduce the adhesiveness of fingerprints such as oil stains and the like, the existence of the oleophilic areas can uniformly spread the attached fingerprints such as the oil stains and the like, and the combination of the oleophilic areas and the oleophilic areas can reduce the scattering effect of the fingerprints in the form of liquid drops and reduce the total area of the fingerprints in the form of liquid films, so that the visibility of the fingerprints is obviously reduced under the light scattering condition and the light reflection condition, and the fingerprint residue degree is also obviously reduced.
The visibility of the fingerprint can be measured by a currently known quantitative test method (JP2011099744), and specifically, the visibility is obtained by measuring the brightness and the chromaticity of the fingerprint pattern.
Fingerprints in the form of oil stains, for example, according to the principle of energy minimization, oil stains spontaneously migrate from an oleophobic area (i.e., a low surface energy area) to an oleophilic area (i.e., a high surface energy area), i.e., the presence of the oleophobic area reduces the amount of oil stain attachment, while oil stains entering the oleophilic area may form a discontinuous oil film (due to the spacing, i.e., discontinuity, of the oleophilic areas). Therefore, compared with a pure oleophilic fingerprint-resistant coating, the fingerprint-resistant coating provided by the embodiment of the invention can obviously reduce the total area of an oil film, and further reduce the visibility of fingerprints under the light reflection condition; compared with a pure oleophobic fingerprint-resistant coating, the fingerprint-resistant coating provided by the embodiment of the invention has the advantages that oil stains based on the oleophobic area of the fingerprint-resistant coating spontaneously enter the oleophilic area, so that light scattering caused by oil drops is avoided, white fog-shaped fingerprints are prevented, and the permeability is ensured.
In the embodiment of the invention, the oleophilic area and the oleophobic area on the fingerprint-resistant coating exist in a micro-area form, which is more beneficial to achieving the effects. Wherein, the size of the oleophilic area and the oleophobic area can be controlled in the nanometer scale.
The shape of the oleophilic areas may be the same or different for the plurality of oleophilic areas, for example, the shape of the oleophilic areas may be square, circular, elliptical, polygonal, other regular or irregular geometric shapes of any configuration, etc., as long as the area of each oleophilic area is ensured to be within the desired range. It will be appreciated that when the shape of the plurality of discrete oleophilic areas is determined, the shape of the oleophobic area is defined accordingly.
In the embodiment of the invention, the area of any oleophilic area can be smaller than 9 multiplied by 10-4mm2Further, the area of any oleophilic area is less than 1 × 10-6mm2So as to achieve the purpose of obviously reducing the visibility of the fingerprint.
In embodiments of the present invention, the total area of oleophilic areas and the total area of oleophobic areas can be the same or different, e.g., the total area of oleophilic areas can be made larger or smaller than the total area of oleophobic areas. In a possible implementation mode, the total area of the oleophilic areas can be smaller than that of the oleophobic areas, so that the attachment of fingerprints such as oil stains and the like can be reduced as much as possible, a small amount of residual oil drops can spontaneously enter the oleophilic areas to form an oil film, the area of the oil film is correspondingly reduced, and the method is very favorable for reducing the visibility of the fingerprints. For example, the ratio of the total area of the plurality of oleophilic areas to the total area of the oleophobic areas can be 0.1-0.9: 1.
On the other hand, the embodiment of the invention also provides a preparation method of the fingerprint-resistant coating, which comprises the following steps: a deposition solution for forming a fingerprint resistant coating is provided.
Forming a fingerprint resistant coating on the substrate by using the deposition solution.
Wherein the fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and an oleophobic area positioned in a spacing area of the oleophilic areas.
In the embodiment of the present invention, the material of the substrate includes, but is not limited to: glass, metal, plastic, ceramic, and other substrate materials commonly used in the art.
When the fingerprint-resistant coating is applied to the surface of the terminal, the substrate is the shell of the terminal. According to the application object of the fingerprint-resistant coating, the type of the coating material contained in the deposition solution and other factors, a proper coating forming mode can be selected to form the fingerprint-resistant coating on the substrate by the deposition solution. The following description is given for the formation modes of the applicable fingerprint-resistant coating when the types of the film forming solutions are different:
as an example, (A) when the deposition solution for forming the fingerprint-resistant coating layer includes: and in the process of preparing the oleophobic and oleophilic film forming solution, the oleophobic and oleophilic film forming solution is utilized to form the fingerprint-resistant coating on the substrate by a double-source co-evaporation process. The above operation process can be seen in fig. 2.
And the oleophilic film-forming solution is used as a disperse phase and the oleophobic film-forming solution is used as a continuous phase due to the incompatible characteristics of the oleophobic film-forming solution and the oleophilic film-forming solution, and the oleophilic film-forming solution can be spontaneously separated to form a plurality of oleophilic areas which are distributed at intervals and oleophobic areas which are positioned in the intervals of the oleophilic areas.
For the above example, the preparation of the fingerprint resistant coating may be performed by the following operating steps:
the substrate may be pretreated to clean the surface, for example, the substrate may be washed in an alkaline solvent for a certain period of time (e.g., 10-40min), and then dried.
And (3) placing the cleaned substrate in a vacuum chamber of an evaporation device, and carrying out plasma cleaning on the surface of the substrate so as to further clean the surface of the substrate. Wherein, the power of plasma cleaning can be 1000W.
And respectively placing the oleophobic deposition solution and the oleophilic deposition solution into two evaporation sources of the vacuum chamber, respectively setting the evaporation rates of the oleophobic deposition solution and the oleophilic deposition solution, and carrying out double-source co-evaporation on the substrate.
And (3) standing the evaporated substrate in a constant temperature and humidity environment (for example, the temperature is 20-25 ℃ and the humidity is 30% -50%) for a certain time (for example, 5-15 hours), so that the expected fingerprint-resistant coating can be obtained on the substrate.
Wherein, can be through the evaporation coating rate of the oleophobic membrane forming liquid of control and lipophilic membrane forming liquid, control the area ratio of oleophobic regional and lipophilic region, this is because, through controlling their evaporation coating rate, can corresponding control evaporation coating volume ratio between them, and then control the area ratio of oleophobic regional and lipophilic region, the evaporation coating rate ratio of oleophobic membrane forming liquid and lipophilic membrane forming liquid promptly is directly proportional with the area ratio of oleophobic regional and lipophilic region, so can realize the control to fingerprint visibility.
It should be noted that, in the embodiment of the present invention, the shape of the plurality of oleophilic areas can be formed spontaneously, and the area of any oleophilic area can be made smaller than 9 × 10 by controlling the evaporation rate-4mm2。
In the embodiment of the invention, no matter the evaporation rate of the oleophobic deposition solution is greater than, less than or equal to that of the oleophilic deposition solution, the visibility of the obtained fingerprint-resistant coating can achieve the effect of being obviously reduced compared with the prior art. On the basis, in order to obtain a more excellent fingerprint visibility reducing effect, the evaporation rate of the oleophobic deposition solution may be made greater than that of the oleophilic deposition solution, and for example, the evaporation rate of the oleophobic deposition solution may be 2 to 10 times that of the oleophilic deposition solution. For example, the deposition rate of the oleophilic deposition solution may be set to 0.1nm/s to 0.5nm/s, such as 0.1nm/s, 0.2nm/s, 0.3nm/s, 0.4nm/s, 0.5nm/s, and the like.
In addition to controlling the evaporation rate, it is necessary to control other parameters within reasonable ranges in the co-evaporation process to form a uniform and smooth fingerprint-resistant coating. For example, the substrate temperature can be controlled at room temperature (e.g., 20 ℃ to 28 ℃) and the vacuum can be controlled to less than 10%-3Pa, and the like.
In an embodiment of the present invention, the oleophobic deposition solution at least includes an oleophobic coating material and a solvent, and the oleophilic deposition solution at least includes an oleophilic coating material and a solvent. It is not excluded that the above-mentioned deposition solutions may further comprise additional additives, such as surfactants, stabilizers, etc., in order to improve other properties of the fingerprint resistant coating, such as hardness, smoothness, etc.
For example, the oleophobic membrane material suitable for the embodiment of the present invention may be silicone compound, fluorine compound, etc., such as perfluoropolyether, polydimethylsiloxane, etc., and the solvent for dissolving the same may include but is not limited to: at least one of m-trifluoromethyl benzene, methanol and isopropanol, and the mass concentration of the oleophobic coating material in the oleophobic deposition solution can be 20-99%, for example, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc.
The lipophilic film material suitable for the embodiment of the present invention may be alkane, alkene, fatty acid, ester compound, such as dodecyl trimethoxy silane, etc., and the solvent for dissolving the lipophilic film material may include but is not limited to: at least one of m-trifluoromethyl benzene, methanol and isopropanol, and the mass concentration of the lipophilic film material in the lipophilic film-forming solution can be 1-70%, for example, 10%, 20%, 30%, 40%, 50%, 60%, etc.
In order to confirm the superiority of the fingerprint-resistant coating provided by the embodiment of the invention, the oleophilic-oleophobic composite fingerprint-resistant coating prepared by the method provided by the embodiment of the invention is compared with the oleophilic type fingerprint-resistant coating and the oleophobic type fingerprint-resistant coating provided by the prior art. The oleophilic deposition solution used in the oleophilic type fingerprint-resistant coating provided by the prior art is the same as the oleophilic deposition solution used in the embodiment of the invention, and the oleophobic deposition solution used in the oleophobic fingerprint-resistant coating provided by the prior art is the same as the oleophobic deposition solution used in the embodiment of the invention. The preparation methods of the fingerprint-resistant coatings are the same, except for different evaporation rates, other operation parameters are kept consistent, and specific parameters and results can be seen in table 1:
TABLE 1
As can be seen from table 1, compared with the prior art, the oleophilic-oleophobic composite fingerprint-resistant coating provided by the embodiment of the present invention has a significantly reduced fingerprint visibility. With the present invention, as the evaporation rate of the oleophobic deposition solution is increased relative to the evaporation rate of the oleophilic deposition solution, the visibility of the fingerprint is correspondingly reduced.
(II) As another example, when the deposition solution for forming the fingerprint-resistant coating layer includes: when the oleophobic coating material, the oleophilic coating material and the first solvent are used, the film forming solution can be used for forming the fingerprint-resistant coating on the substrate by adopting a single-source evaporation process. The above operation process can be seen in fig. 3.
The method comprises the steps of placing a film forming solution containing an oleophobic membrane material and an oleophilic membrane material on a substrate by utilizing a single-source co-evaporation process, wherein the oleophilic membrane material is used as a dispersion phase and the oleophobic membrane material is used as a continuous phase due to the incompatible characteristics of the oleophobic membrane material and the oleophilic membrane material, and the oleophilic membrane material can be spontaneously separated to form a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas.
For the above example, the preparation of the fingerprint resistant coating may be performed by the following operating steps:
the substrate may be pretreated to clean the surface, for example, the substrate may be washed in an alkaline solvent for a certain period of time (e.g., 10-40min), and then dried.
And (3) placing the cleaned substrate in a vacuum chamber of an evaporation device, and carrying out plasma cleaning on the surface of the substrate so as to further clean the surface of the substrate. Wherein, the power of plasma cleaning can be 1000W.
Placing the film-forming solution in the evaporation source of the vacuum chamber, setting the evaporation rate of the film-forming solution, and performing single-source evaporation on the substrate.
And (3) standing the evaporated substrate in a constant temperature and humidity environment (for example, the temperature is 20-25 ℃ and the humidity is 30% -50%) for a certain time (for example, 5-15 hours), so that the expected fingerprint-resistant coating can be obtained on the substrate.
For this example, the area ratio of the oleophobic area and the oleophilic area can be controlled by controlling the mass ratio of the oleophobic coating material to the oleophilic coating material, because the evaporation amount ratio of the oleophobic area and the oleophilic area can be correspondingly controlled by controlling the mass ratio of the oleophobic coating material to the oleophilic coating material, and further the area ratio of the oleophobic area to the oleophilic area is controlled, i.e. the evaporation rate ratio of the oleophobic deposition solution to the oleophilic deposition solution is proportional to the area ratio of the oleophobic area to the oleophilic area.
In the embodiment of the invention, no matter the mass of the oleophobic coating material is greater than, less than or equal to that of the oleophilic coating material, the visibility of the obtained fingerprint-resistant coating can achieve the effect of being obviously reduced compared with the prior art. On the basis, in order to obtain better fingerprint visibility reducing effect, the mass of the oleophobic membrane material can be larger than that of the oleophilic membrane material, for example, the mass of the oleophobic membrane material can be 2-10 times of that of the oleophilic membrane material.
In the single-source evaporation process, the evaporation rate of the mixed film material can be controlled to be 0.5-2nm/s, such as 0.5nm/s, 0.8nm/s, 1nm/s, 1.2nm/s, 1.5nm/s, 2nm/s and the like, so as to ensure the controllability of the film forming process.
It is also important to control other parameters within reasonable ranges during single source evaporation, for example, the substrate temperature can be controlled at room temperature (e.g., 20-28 deg.C), and the vacuum degree can be controlled to be less than 10-3Pa, and the like.
It is not excluded that the deposition solutions according to the present example may further comprise additional additives, such as surfactants, stabilizers, etc., in order to improve other properties of the fingerprint resistant coating, such as hardness, smoothness, etc.
The lipophilic film material suitable for the embodiment of the present invention may be alkane, alkene, fatty acid, ester compound, such as dodecyl trimethoxy silane, etc., and the solvent for dissolving the lipophilic film material may include but is not limited to: at least one of m-trifluoromethyl benzene, methanol and isopropanol, and the mass concentration of the lipophilic film material in the lipophilic film-forming solution can be 1-70%, for example, 10%, 20%, 30%, 40%, 50%, 60%, etc.
It will be understood by those skilled in the art that the evaporation apparatus used is common in the art for the above dual-source evaporation and single-source evaporation, and the evaporation source can be heated by resistance. The embodiments of the present invention will not be described herein.
In order to confirm the superiority of the fingerprint-resistant coating provided by the embodiment of the invention, the oleophilic-oleophobic composite fingerprint-resistant coating prepared by the method provided by the embodiment of the invention is compared with the oleophilic type fingerprint-resistant coating and the oleophobic type fingerprint-resistant coating provided by the prior art. The oleophilic membrane material used by the oleophilic type fingerprint-resistant coating provided by the prior art is the same as the oleophilic membrane material used in the embodiment of the invention, and the oleophobic membrane material used by the oleophobic type fingerprint-resistant coating provided by the prior art is the same as the oleophobic membrane material used in the embodiment of the invention. The preparation methods of the fingerprint-resistant coatings are the same, except that the mass ratio of the oleophilic membrane material to the oleophobic membrane material is different, other operation parameters are kept consistent, and specific parameters and results can be seen in table 2:
TABLE 2
As can be seen from table 2, compared with the prior art, the oleophilic-oleophobic composite fingerprint-resistant coating provided by the embodiment of the present invention has a significantly reduced fingerprint visibility. According to the invention, the fingerprint visibility is correspondingly reduced along with the gradual increase of the mass ratio of the oleophobic coating material to the oleophilic coating material.
(III) As still another example, when the deposition solution for forming the fingerprint-resistant coating layer includes: and when the graft copolymer with the oleophobic group and the oleophilic group and the second solvent are simultaneously adopted, the film forming solution can be used for forming the fingerprint-resistant coating on the substrate by adopting a single-source evaporation process. The above operation process can also be seen in fig. 3.
And spraying the film forming solution on a substrate by using a single-source co-evaporation process, wherein the two groups can spontaneously agglomerate based on the existence of the oleophobic group and the oleophilic group in the graft copolymer with the oleophobic group and the oleophilic group to form a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the intervals of the oleophilic areas.
For the above example, the preparation of the fingerprint resistant coating may be performed by the following operating steps:
the substrate may be pretreated to clean the surface, for example, the substrate may be washed in an alkaline solvent for a certain period of time (e.g., 10-40min), and then dried.
And (3) placing the cleaned substrate in a vacuum chamber of an evaporation device, and carrying out plasma cleaning on the surface of the substrate so as to further clean the surface of the substrate. Wherein, the power of plasma cleaning can be 1000W.
The deposition solution is placed in an evaporation source of the vacuum chamber, and the deposition rate of the deposition solution is set to, for example, 1 to 2nm/s, thereby performing single-source deposition on the substrate.
And (3) standing the evaporated substrate in a constant temperature and humidity environment (for example, the temperature is 20-25 ℃ and the humidity is 30% -50%) for a certain time (for example, 5-15 hours), so that the expected fingerprint-resistant coating can be obtained on the substrate.
Experiments prove that the fingerprint visibility can be reduced to below 50 percent and further reduced to below 30 percent by using the fingerprint-resistant coating provided by the example to measure the visibility.
For the above example, the area ratio of the oleophobic area and the oleophilic area can be controlled by controlling the molar ratio of the oleophobic group and the oleophilic group.
The graft copolymer may be used in the deposition solution at a mass concentration of 10% to 70%, for example, 10%, 20%, 30%, 40%, 50%, 60%, 70%, etc., so that the vacuum deposition can be smoothly performed.
The chemical structure of the graft copolymer suitable for use in embodiments of the present invention may be as follows:
wherein R is1Is an organic group such as alkyl, phenyl, etc.; r2Can be selected from low surface energy organic chains (i.e., oleophobic groups) such as fluorine, silicon and the like; r3Can be selected from lipophilic organic chains (i.e., lipophilic groups) such as alkanes, alkenes, fatty acids, esters, and the like.
The second solvent for dissolving the graft copolymer may be at least one of m-trifluoromethylbenzene, methanol, and isopropanol.
It is not excluded that the deposition solutions according to the present example may further comprise additional additives, such as surfactants, stabilizers, etc., in order to improve other properties of the fingerprint resistant coating, such as hardness, smoothness, etc.
(IV) As still another example, when the deposition solution for forming the fingerprint-resistant coating layer includes: and respectively coating films on the substrate by using the oleophobic deposition solution and the lipophilic deposition solution through a photoetching process to form an oleophobic area and an oleophilic area.
In the above example, by the characteristics of the photolithography process, it is possible to define a plurality of oleophilic-deposition-liquid-application areas corresponding to oleophilic areas on the substrate and an oleophobic-deposition-liquid-application area corresponding to oleophobic area, and further coat oleophilic deposition liquid on the oleophilic-deposition-liquid-application areas and oleophobic deposition liquid on the oleophobic-deposition-liquid-application areas, thereby forming a plurality of oleophilic areas spaced apart from each other and oleophobic areas located in the spaces between oleophilic areas.
Experiments prove that the fingerprint visibility of the fingerprint-resistant coating provided by the example can be as low as below 50%, further can be as low as 30%, and even can be below 10% when the fingerprint-resistant coating is used for measuring the visibility. For example, when the area of the single oleophilic region is 4X 10-4mm2When the fingerprint visibility is reduced to 10%, the area of the single oleophilic area is 1 multiplied by 10-6mm2When the fingerprint visibility is over, the fingerprint visibility can be reduced to 4%.
For the above example, the preparation of the fingerprint-resistant coating can be performed by the following operation steps, and the preparation flow can be seen in fig. 4:
the substrate may be pretreated to clean the surface, for example, the substrate may be washed in an alkaline solvent for a certain period of time (e.g., 10-40min), and then dried.
A layer of photoresist masking liquid is coated on a substrate, a mask plate with a certain structure is adopted for exposure under ultraviolet light, and then a plurality of photoresist films are formed after development, film hardening and etching, so that the plurality of photoresist films respectively occupy the positions of a plurality of oleophylic areas.
A substrate having a plurality of resist films is coated with an oil-repellent film-forming solution to form an oil-repellent region.
Removing the plurality of photoresist films on the substrate to expose the position of the oleophilic area, coating the film on the substrate by using the oleophilic film-forming solution, washing off the redundant oleophilic film, only keeping the oleophilic film at the oleophilic area and keeping the surface of the oleophilic film level with the surface of the oleophobic film at the oleophobic area, and finally forming the oleophilic area.
In this example, the structure of the mask (including the distribution, shape, and area of the voids thereon) may correspond to the distribution and structure of the oleophilic areas, and the distribution of the oleophobic and oleophilic areas (where the "distribution" includes the areas and shapes of the oleophobic and oleophilic areas) may be controlled by controlling the structure of the mask employed during the lithographic process.
In an embodiment of the present invention, the oleophobic deposition solution at least includes an oleophobic coating material and a solvent, and the oleophilic deposition solution at least includes an oleophilic coating material and a solvent. It is not excluded that the above-mentioned deposition solutions may further comprise additional additives, such as surfactants, stabilizers, etc., in order to improve other properties of the fingerprint resistant coating, such as hardness, smoothness, etc.
For example, the lipophilic film material suitable for the embodiment of the present invention may be alkane, alkene, fatty acid, ester compound, such as dodecyl trimethoxy silane, etc., and the solvent for dissolving the lipophilic film material may include, but is not limited to: at least one of m-trifluoromethyl benzene, methanol and isopropanol, and the mass concentration of the lipophilic film material in the lipophilic film-forming solution can be 1-70%, for example, 10%, 20%, 30%, 40%, 50%, 60%, etc.
In yet another aspect, embodiments of the present invention further provide a terminal having any one of the fingerprint-resistant coatings described above on a surface thereof.
Based on the fingerprint-resistant coating provided by the embodiment of the invention, the visibility of fingerprints on the surface of the terminal under the light scattering condition and the light reflection condition is obviously reduced, the fingerprint residue is also obviously reduced, and the user experience and the product competitiveness are improved.
In the embodiment of the present invention, the related terminals include but are not limited to: cell-phone, panel computer, LCD TV, camera, on-vehicle display etc..
In another aspect, an embodiment of the present invention further provides a method for manufacturing a terminal, where the method includes: the terminal body and the terminal housing are prepared separately.
By using the preparation method of the fingerprint-resistant coating, the fingerprint-resistant coating is formed on the outer surface of the terminal shell.
And assembling the terminal shell with the fingerprint-resistant coating on the terminal main body to form the terminal.
By utilizing the preparation method, the terminal with the fingerprint-resistant coating on the surface can be obtained, the visibility of the fingerprint of the terminal is obviously reduced, meanwhile, the fingerprint residue is also obviously reduced, and the improvement of user experience and product competitiveness is facilitated.
The above description is only an example of the present invention and should not be taken as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A method for preparing a fingerprint resistant coating, the method comprising: providing a film forming solution for forming a fingerprint-resistant coating;
forming the fingerprint-resistant coating on a substrate by using the film-forming solution;
wherein the fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the interval areas of the oleophilic areas;
the film forming solution comprises: oleophobic and lipophilic deposition solutions;
and forming the fingerprint-resistant coating on the substrate by using the oleophobic film-forming solution and the oleophilic film-forming solution through a double-source co-evaporation process.
2. A method for preparing a fingerprint resistant coating, the method comprising: providing a film forming solution for forming a fingerprint-resistant coating;
forming the fingerprint-resistant coating on a substrate by using the film-forming solution;
wherein the fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the interval areas of the oleophilic areas;
the film forming solution comprises: the oil-repellent coating material, the oleophilic coating material and the first solvent;
and forming the fingerprint-resistant coating on the substrate by using the film forming solution through a single-source evaporation process.
3. A method for preparing a fingerprint resistant coating, the method comprising: providing a film forming solution for forming a fingerprint-resistant coating;
forming the fingerprint-resistant coating on a substrate by using the film-forming solution;
wherein the fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the interval areas of the oleophilic areas;
the film forming solution comprises: a graft copolymer having both an oleophobic group and an oleophilic group and a second solvent;
and forming the fingerprint-resistant coating on the substrate by using the film forming solution through a single-source evaporation process.
4. A method for preparing a fingerprint resistant coating, the method comprising: providing a film forming solution for forming a fingerprint-resistant coating;
forming the fingerprint-resistant coating on a substrate by using the film-forming solution;
wherein the fingerprint resistant coating comprises: the oil-repellent oil-removing device comprises a plurality of oleophilic areas distributed at intervals and oleophobic areas positioned in the interval areas of the oleophilic areas;
the film forming solution comprises: oleophobic and lipophilic deposition solutions;
and respectively coating films on the substrate by using the oleophobic film-forming solution and the oleophilic film-forming solution through a photoetching process to form the oleophobic area and the oleophilic area.
5. A production method according to claim 1, wherein the ratio of the areas of said oleophobic area and said oleophilic area is controlled by controlling the evaporation rates of said oleophobic deposition solution and said oleophilic deposition solution.
6. The preparation method according to claim 2, characterized in that the area ratio of the oleophobic area and the oleophilic area is controlled by controlling the mass ratio of the oleophobic coating material to the oleophilic coating material.
7. The production method according to claim 3, characterized in that the area ratio of the oleophobic area and oleophilic area is controlled by controlling the molar ratio of the oleophobic group and oleophilic group.
8. A preparation method according to claim 4, characterized in that the distribution of the oleophobic area and the oleophilic area is controlled by controlling the structure of a mask plate used in the photolithography process.
9. The method of any one of claims 1-8, wherein the area of any of said oleophilic regions is less than 9 x 10-4mm2。
10. The method of any one of claims 1-8, wherein the area of any of said oleophilic regions is less than 1 x 10-6mm2。
11. A method for preparing a terminal, the method comprising: respectively preparing a terminal main body and a terminal shell;
forming a fingerprint-resistant coating layer on an outer surface of the terminal housing using the manufacturing method of any one of claims 1 to 10;
and assembling the terminal shell with the fingerprint-resistant coating on the terminal main body to form the terminal.
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