CN112390536B - Ultrathin glass cover plate, ultrathin strengthened glass cover plate and preparation method of ultrathin glass cover plate - Google Patents
Ultrathin glass cover plate, ultrathin strengthened glass cover plate and preparation method of ultrathin glass cover plate Download PDFInfo
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- CN112390536B CN112390536B CN201910738969.1A CN201910738969A CN112390536B CN 112390536 B CN112390536 B CN 112390536B CN 201910738969 A CN201910738969 A CN 201910738969A CN 112390536 B CN112390536 B CN 112390536B
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
-
- 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
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/08—Printing inks based on natural resins
-
- 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
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D11/107—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
- H04M1/185—Improving the rigidity of the casing or resistance to shocks
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- General Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
The invention discloses an ultrathin glass cover plate, an ultrathin strengthened glass cover plate and a preparation method thereof. The preparation method of the ultrathin glass cover plate comprises the step of utilizing etching liquid to etch an ultrathin glass cover plate with the shape consistent with a cutting pattern, wherein the front surface of the ultrathin glass cover plate is sprayed with acid-resistant ink corresponding to the cutting pattern, and the back surface of the ultrathin glass cover plate is provided with the ultrathin glass mother sheet with the thickness of less than or equal to 150 mu m and the thickness of the ultrathin glass mother sheet is provided with the acid-resistant ink. In this way, the ultra-thin glass master slice is directly divided into the ultra-thin glass cover plates by means of chemical corrosion, so that external mechanical stress does not act on large-size ultra-thin glass, and cracks and breakage do not occur on the cutting edges of the ultra-thin glass cover plates. In addition, the acid-resistant ink can be used for forming cutting patterns in any shape, so that the shape and the contour of the ultrathin glass cover plate obtained by the preparation method are also arbitrary, and the ultrathin glass cover plate is suitable for mobile phone screens of different brands and types.
Description
Technical Field
The invention relates to the technical field of display screen protective covers, in particular to a protective cover used for a display screen in a smart phone or a tablet personal computer or television equipment, and more particularly relates to an ultrathin glass cover plate, an ultrathin strengthened glass cover plate and a preparation method thereof.
Background
With the progress of science and technology, smart phones have become essential production tools in people's daily life. In order to improve the visual experience, for example, when the user watches videos or plays games, the user can have better operability and appreciation, a mobile phone manufacturer can improve the screen occupation ratio as much as possible by adopting an ultra-narrow frame technology, a bang screen technology and a water drop screen technology, so that the same area of the front surface of the body can accommodate a larger screen. However, due to the difficult placement of the receivers, the cameras and the like in the prior art, the screen occupation ratio is difficult to achieve 100%, and even if 100% of the screen occupation ratio is achieved, the limitation of the mobile phone volume is basically reached by making the displayable area of the screen to be 7 inches, and the mobile phone is inconvenient to carry at ordinary times because the mobile phone is bigger, so that the advantage that the mobile phone is convenient to carry is lost.
To overcome the above limitations, some cell phone manufacturers have proposed folding screen cell phones. Present folding screen cell-phone all designs based on the flexible screen of OLED organic light emitting diode technique, and the protection apron on the flexible screen of OLED is mostly the flexible material of plastics, although plastics apron possess better toughness and accord with folding demand basically, but because the restriction of its mechanical properties, plastics apron is easily scraped the flower, impact strength is lower, be intolerant to fall, can not play fine guard action to the display screen, and can produce surface crack after folding many times, the crackle appears easily in deformation and screen, defects such as ripple, direct influence product use, the life-span of product has been reduced. The conventional glass cover plate is poor in flexibility and not beneficial to bending of the OLED flexible screen. Accordingly, some glass manufacturers have proposed a solution for manufacturing a glass cover plate with ultra-thin glass, but the prior solution has a problem that in the glass production process, an ultra-thin glass substrate with a larger size must be processed into an ultra-thin glass cover plate with a target-specific and smaller size to be put into use, and mechanical cutting and laser cutting are the most common methods for cutting glass, and no matter mechanical cutting or laser cutting is adopted, the glass is very easy to generate micro cracks at the cutting edge of the glass during cutting, the micro cracks at the cutting edge greatly reduce the strength of the glass and make the glass cannot be bent, and furthermore, the glass with larger edge cracks is broken under stress during chemical strengthening. Because the thickness of the ultra-thin glass is too thin, before chemical strengthening, edge cracks are very difficult to polish and remove by a mechanical or chemical method, and the glass is very easy to break because the glass is very difficult to pick up and carry in the processing process.
Therefore, there is a need for a method of manufacturing ultra-thin glass cover sheets that have no or few microcracks and maintain the natural state of the glass with continuous and easily performed processing steps.
Disclosure of Invention
An object of the present invention is to provide a method for manufacturing an ultra-thin glass cover plate, which can flexibly and directly manufacture various target patterns, and prevent cracks and damages at the cut edge of the ultra-thin glass cover plate due to no external mechanical stress applied to the large-size ultra-thin glass during the process of cutting the large-size ultra-thin glass into the small-size ultra-thin glass cover plate, so as to ensure that the ultra-thin glass cover plate manufactured by the method has better strength, and can obtain higher strength through chemical strengthening, and can be finally applied to an OLED flexible screen.
Another object of the present invention is to provide an ultra-thin glass cover plate manufactured by the above manufacturing method.
The invention further aims to provide a preparation method of the ultrathin tempered glass cover plate, which is characterized in that the ultrathin tempered glass cover plate is obtained by carrying out chemical tempering on the ultrathin tempered glass cover plate, so that the ultrathin tempered glass cover plate with further improved strength is obtained. The bending resistance of the ultrathin strengthened glass cover plate is greatly improved, and the 180-degree folding times can reach more than 20 ten thousand times under the condition that the folding radius is less than 5 mm.
Still another object of the present invention is to provide an ultra-thin strengthened glass cover plate manufactured by the above manufacturing method.
In order to achieve the purpose, the method for manufacturing the ultrathin glass cover plate is characterized in that an ultrathin glass master piece with the front surface coated with acid-resistant ink corresponding to a cutting pattern and the back surface coated with the acid-resistant ink and the thickness of less than or equal to 150 microns is etched by using etching liquid to form the ultrathin glass cover plate with the shape consistent with the cutting pattern. In this way, the ultra-thin glass master slice is directly divided into the ultra-thin glass cover plates by means of chemical corrosion, so that external mechanical stress does not act on large-size ultra-thin glass, and cracks and breakage do not occur on the cutting edges of the ultra-thin glass cover plates. In addition, the acid-resistant ink can be used for forming cutting patterns in any shape, so that the shape and the contour of the ultrathin glass cover plate obtained by the preparation method are also arbitrary, and the ultrathin glass cover plate is suitable for mobile phone screens of different brands and types.
As a preferred scheme of the preparation method of the ultrathin glass cover plate, the preparation method comprises the following steps:
step S1, preparing plate glass with opposite front and back surfaces, and laying acid-resistant ink on the back surface of the plate glass;
step S2, fixing the plate glass with the back surface coated with acid-resistant ink on a base, wherein the base is provided with a supporting surface for bearing the plate glass, an acid-resistant glue layer or a spacer is arranged on the supporting surface, the back surface of the plate glass is supported on the glue layer or the spacer, and the side surface of the plate glass is completely glued with the glue layer or the spacer;
step S3, etching and thinning the front side of the plate glass to obtain an ultrathin glass master slice with the thickness less than or equal to 150 um;
step S4, acid-resistant ink corresponding to the cutting pattern is distributed on the front surface of the ultrathin glass master slice;
step S5, immersing the ultrathin glass master slice in etching solution for processing for a certain time to obtain an ultrathin glass cover plate with the shape consistent with the cutting pattern;
step S6, taking the glue layer and the ultrathin glass cover plate together, taking the etching solution out, and separating the glue layer and the ultrathin glass cover plate;
and step S7, removing the acid-resistant ink on the front surface and the back surface of the ultrathin glass cover plate.
As a preferable embodiment of the method for manufacturing an ultra-thin glass cover plate provided by the present invention, step SA is performed between step S6 and step S7: after the plurality of ultra-thin glass cover plates obtained in the step S6 are laminated, the side edges of the plurality of ultra-thin glass cover plates are polished by the etching solution.
As a preferable embodiment of the method for manufacturing an ultra-thin glass cover plate provided by the present invention, the step S3 includes a step S31 and a step S32, wherein,
in the step S31, the etching liquid is used to etch and thin the plate glass for a certain period of time;
the step S32 is to perform etching and thinning treatment on the flat glass for a certain time by using a chemical cutting liquid with lower etching capability than the etching liquid;
the step S31 is performed before or after the step S32, and the steps S31 and S32 are performed once or repeatedly performed a plurality of times.
As a preferable embodiment of the method for manufacturing an ultra-thin glass cover plate provided by the present invention, the back surface of the flat glass in step S1 has a reserved seam corresponding to the cutting pattern, and the reserved seam has a depth of at least 2 um.
The preferable embodiment of the method for manufacturing an ultra-thin glass cover plate according to the present invention further includes step S01 or step S02, wherein,
step S01, forming the reserved seam on the back surface of the flat glass by using a laser cutting method;
in the step S02, acid-resistant ink corresponding to the cutting pattern is first applied to the back surface of the plate glass, and then the etching solution is used to treat the back surface of the plate glass for a certain time to obtain the reserved seam;
the step S01 or the step S02 is implemented before the step S1.
As a preferable scheme of the method for manufacturing an ultra-thin glass cover plate, the back surface of the plate glass described in the step S1 is smooth.
As a preferable scheme of the preparation method of the ultrathin glass cover plate, the thickness of the flat glass is 0.3 +/-0.15 mm.
As a preferable embodiment of the method for manufacturing an ultrathin glass cover plate, the etching solution is an acidic aqueous solution containing fluoride ions, and the etching solution further contains at least one of sulfate groups or nitrate groups.
As a preferable scheme of the preparation method of the ultrathin glass cover plate, the acid-resistant ink comprises 50% of acrylic resin by weight percent: 65-75%; rosin: 15 to 20 percent; alcohol soluble scarlet B: 0.5-1.0%; n-butanol: 15 to 20 percent; the 50% acrylic resin comprises the following components in percentage by weight: methyl methacrylate: 12 to 22 percent; butyl acrylate: 8 to 12 percent; styrene: 6 to 10 percent; methacrylic acid: 10 to 20 percent; benzoyl peroxide: 0.5 to 1.5 percent; xylene: 44-54 percent.
In a preferred embodiment of the method for manufacturing an ultrathin glass cover plate according to the present invention, the glue layer is formed by coating an acid-resistant glue on the supporting surface of the base and curing, and the acid-resistant glue is uv glue or thermosetting glue.
In order to achieve the purpose, the invention also provides an ultrathin glass cover plate which is prepared according to the preparation method.
In order to achieve the purpose, the invention also provides a preparation method of the ultrathin strengthened glass cover plate, which comprises the following steps:
preparing an ultra-thin glass cover plate according to the preparation method;
and placing the ultrathin glass cover plate in a chemical strengthening salt bath for ion exchange to obtain the ultrathin strengthened glass cover plate.
In order to achieve the purpose, the invention also provides an ultrathin tempered glass cover plate which is prepared by the preparation method, wherein the front surface or the back surface of the ultrathin tempered glass cover plate is provided with a compressive stress layer with the depth of less than 20% of the thickness of the ultrathin tempered glass cover plate.
Compared with the prior art, the preparation method of the ultrathin glass cover plate has the following beneficial effects: the preparation method comprises the step of spraying acid-resistant ink corresponding to a cutting pattern on the front surface of the ultrathin glass mother sheet, and arranging an ultrathin glass cover plate with the thickness of less than or equal to 150 mu m and the acid-resistant ink on the back surface of the ultrathin glass mother sheet by using etching liquid, wherein the ultrathin glass cover plate is in a shape consistent with the cutting pattern. Thus, the ultra-thin glass master slice is directly divided into the ultra-thin glass cover plates by means of chemical corrosion, so that no external mechanical stress acts on the large-size ultra-thin glass, and no crack or damage is caused at the cutting edge of the ultra-thin glass cover plate. In addition, any shape of cutting patterns can be formed by using acid-resistant ink, so that the shape and the outline of the ultrathin glass cover plate obtained by the preparation method are also arbitrary, and the ultrathin glass cover plate is suitable for mobile phone screens of different brands and types.
Drawings
FIG. 1 is a view showing one shape of a cutting pattern according to the present invention;
FIG. 2 is another shape of the cutting pattern according to the present invention;
FIG. 3 is another shape of the cutting pattern according to the present invention;
FIG. 4 is a first schematic view of the operation of the method for manufacturing an ultra-thin glass cover plate according to the present invention;
FIG. 5 is a second schematic diagram illustrating the operation of the method for manufacturing an ultra-thin glass cover plate according to the present invention;
FIG. 6 is a third schematic operational view of a method of making an ultra-thin glass cover plate according to the present invention;
FIG. 7 is a fourth schematic operational view of a method of making an ultra-thin glass cover plate according to the present invention;
fig. 8 is a fifth schematic operation diagram of the manufacturing method of the ultra-thin glass cover plate according to the present invention.
Detailed Description
The preparation method of the ultrathin glass cover plate provided by the invention is that the etching solution is utilized to etch and form the ultrathin glass cover plate with the shape consistent with the cutting pattern by the ultrathin glass mother sheet with the front surface sprayed with the acid-resistant ink corresponding to the cutting pattern and the back surface sprayed with the acid-resistant ink on the whole and with the thickness less than or equal to 150 mu m. The method comprises the following specific steps:
step S1, preparing plate glass with opposite front and back surfaces, and laying acid-resistant ink on the back surface of the plate glass; preferably, the thickness of the plate glass is 0.3 +/-0.15 mm, and the thickness control of the plate glass can be realized by precise polishing, and certainly, the plate glass can also be screened by precise measurement. Preferably, the acid-resistant ink comprises, by weight, 50% of acrylic resin: 65-75%; rosin: 15 to 20 percent; alcohol soluble scarlet B: 0.5-1.0%; n-butanol: 15 to 20 percent; the 50% acrylic resin comprises the following components in percentage by weight: methyl methacrylate: 12 to 22 percent; butyl acrylate: 8 to 12 percent; styrene: 6 to 10 percent; methacrylic acid: 10 to 20 percent; benzoyl peroxide: 0.5-1.5%; xylene: 44 to 54 percent. The acid-resistant ink may be applied to the back surface of the plate glass by means of screen printing, laminated film processing or resist-coated photolithography. The screen printing method, the laminated film processing method or the resist coating photolithography method are all conventional techniques, and thus are not described herein. Preferably, we print the acid-resistant ink on the entire back surface of the plate glass by screen printing. Optionally, the back surface of the plate glass is a smooth surface, that is, the back surface of the plate glass is a smooth flat surface.
Step S2, fixing the plate glass with the back surface coated with the acid-resistant ink on a base, wherein the base is provided with a supporting surface for bearing the plate glass, the supporting surface is provided with an acid-resistant glue layer, the back surface of the plate glass is supported on the glue layer, and the side surface of the plate glass is completely glued with the glue layer (see figure 4); specifically, the glue film have the diapire and with all lateral walls that the diapire is connected, sheet glass's the back support with the diapire of glue film, sheet glass's four sides with all lateral walls glue completely and glue, thereby fix a position sheet glass. Preferably, the glue layer is formed by coating an acid-resistant glue on the supporting surface of the base and curing, and the acid-resistant glue is uv glue or thermosetting glue; the function of the glue layer is used for supporting and fixing the plate glass. Alternatively, the base may be made of a non-metallic material such as plastic, glass, etc. and have at least one flat surface as the supporting surface. In addition, the entire surface of the base is coated with the acid-resistant ink to ensure that the base is not corroded in the subsequent steps.
Step S3, performing etching thinning treatment on the front surface of the flat glass to obtain an ultra-thin glass master slice (see fig. 5) with a thickness of less than or equal to 150 um; the glass etching and thinning process is a well-established technique, and therefore, is not described herein. Preferably, the step S3 includes a step S31 and a step S32, wherein the step S31 is to perform etching and thinning treatment on the flat glass for a certain time by using the etching solution; the step S32 is to perform etching and thinning treatment on the flat glass for a certain time by using a chemical cutting liquid with lower etching capability than the etching liquid; the step S31 is performed before or after the step S32, and the step S31 and the step S32 are performed once or repeatedly performed a plurality of times. Wherein the chemical cutting fluid is an acidic aqueous solution containing fluorine ions. In the process of etching and thinning the plate glass by using the etching solution, the edge of the plate glass is provided with a product generated by the reaction of the etching solution and the plate glass, the plate glass is put into a chemical cutting solution with low etching capability or a simple aqueous solution, and the product can be well dissolved and removed, so that the etching and cutting effects can be better obtained after repeated times.
Step S4 of spraying acid-fast ink corresponding to the cutting pattern on the front surface of the ultra-thin glass master (see fig. 6); similarly, the acid-resistant ink may be applied to the front surface of the plate glass by means of screen printing, lamination film processing or resist-coating photolithography. The cutting pattern depends on the product requirements, and may be, for example, a rectangle with four chamfered corners (see fig. 1), a square with four chamfered corners (see fig. 2), or a rectangle with four chamfered corners and a circular hole left near a short side (see fig. 3).
Step S5, immersing the ultra-thin glass master slice in an etching solution for a certain time to obtain an ultra-thin glass cover plate (see fig. 7) having a shape consistent with the cutting pattern; preferably, the etching solution is an acidic aqueous solution containing fluoride ions, and the etching solution further contains at least one of sulfate and nitrate. For example, the etching solution comprises, by mass: 3-7% of hydrofluoric acid, 8-15% of hydrochloric acid, 8-10% of alkali metal nitrate (or alkali metal sulfate) and the balance of water. Preferably, the cutting conditions of the ultrathin glass master in the etching solution are as follows: the temperature is 20-60 deg.C, and the time is 30-50 min. It should be noted that a certain adhesion force exists between the glue layer and the flat glass, so as to ensure that after the ultra-thin glass master is etched into a plurality of ultra-thin glass cover plates which are separated from each other independently, the ultra-thin glass cover plates can be attached to the glue layer more stably without moving along with the flow of the etching solution.
Step S6, taking out the glue layer and the ultra-thin glass cover plate together with the etching solution, and then separating the glue layer and the ultra-thin glass cover plate (see fig. 8); in this step, the adhesive layer is sucked by a suction cup and the ultra-thin glass cover plate is taken out of the etching solution.
Step S7, removing the acid-resistant ink on the front surface and the back surface of the ultrathin glass cover plate; specifically, the acid-resistant ink can be quickly removed under the action of a specific ink removing agent, and the ultrathin glass cover plate can be grabbed by a sucker or a mechanical arm to be soaked in the ink removing agent in the ink removing process. In addition, the ultrathin glass cover plate can be placed in a closed container to be carbonized at high temperature and the acid-resistant ink can be pulverized, so that the acid-resistant ink can be removed.
And step S8, drying the ultra-thin glass cover plate with the acid-resistant ink removed at the temperature of 60-150 ℃.
The ultrathin glass cover plate provided by the invention can be obtained through the steps, the edge of the ultrathin glass cover plate is not cracked or damaged, so that the ultrathin glass cover plate has better strength, and higher strength can be obtained through chemical strengthening and is finally applied to an OLED flexible screen.
The etching solution, the chemical cutting solution, the acid-resistant ink and the ink remover used in the steps are all commercial products.
In addition, optionally, the back surface of the flat glass in the step S1 is provided with a reserved seam corresponding to the cutting pattern, and the depth of the reserved seam is at least 2 um. The reserved seam may be formed by performing step S01 or step S02 before the step S1. Step S01, forming a reserved seam on the back surface of the flat glass by using a laser cutting method; in the step S02, the acid-resistant ink corresponding to the cutting pattern is applied to the back surface of the plate glass, and then the etching solution is used to treat the back surface of the plate glass for a certain time to obtain the reserved seam. The purpose of forming the reserved seam on the back surface of the plate glass is that in order to etch the front surface of the ultra-thin glass mother sheet in step S5, in the process that the ultra-thin glass mother sheet is cut from top to bottom by the etching solution, the ultra-thin glass mother sheet is etched through more easily even if the ultra-thin glass mother sheet is etched through and aligned with the reserved seam, so that the ultra-thin glass cover plate with a corresponding shape is obtained more easily.
Further, optionally, a step SA is performed between the step S6 and the step S7: after the plurality of ultra-thin glass cover plates obtained in the step S6 are laminated, the side edges of the plurality of ultra-thin glass cover plates are polished by the etching solution. Thus, the edge of the ultra-thin glass cover plate is further ensured to be smooth and flat.
It should be noted that, in step S2, an acid-resistant spacer may be used instead of the glue layer, where the spacer may be a paper sheet or a plastic sheet or a sheet made of other acid-resistant materials, and the spacer is not adhered to the flat glass and the base, so as to facilitate the subsequent separation operation.
The invention provides a preparation method of an ultrathin tempered glass cover plate, which comprises the following steps:
preparing an ultra-thin glass cover plate according to the steps S1-S7, and then, placing the ultra-thin glass cover plate in a chemical strengthening salt bath for ion exchange to obtain the ultra-thin strengthened glass cover plate. Preferably, the front surface or the back surface of the ultra-thin strengthened glass cover plate is provided with a compression stress layer with the depth of less than 20% of the thickness of the ultra-thin strengthened glass cover plate.
The bending resistance of the ultrathin tempered glass cover plate prepared by the steps is greatly improved, and the 180-degree folding times can reach more than 20 ten thousand times under the condition that the folding radius is less than 5 mm.
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
Step S1, preparing sheet glass with a front surface and a back surface which are opposite to each other and a thickness of 0.45mm, wherein the sheet glass is made of high-alumina sodium glass, polishing and grinding the back surface of the sheet glass until the back surface is a smooth and flat surface, and then printing the acid-resistant ink on the whole back surface of the sheet glass by adopting a screen printing method;
step S2, fixing the flat glass with the back surface coated with the acid-resistant ink on a base made of glass with the whole surface coated with the acid-resistant ink, wherein the upper surface of the base is a supporting surface for bearing the flat glass, acid-resistant glue is coated on the supporting surface of the base to form a glue layer, the back surface of the flat glass is supported on the glue layer, and the side surface of the flat glass is completely glued with the glue layer;
step S3, etching and thinning the front surface of the plate glass to obtain an ultrathin glass master slice with the thickness of 100 um;
step S4, acid-resistant ink corresponding to a cutting pattern is distributed on the front surface of the ultrathin glass master slice, and the cutting pattern is a rectangle with four chamfered corners as shown in figure 1;
step S5, immersing the ultrathin glass master slice in etching solution for processing for a certain time to obtain an ultrathin glass cover plate with the shape consistent with the cutting pattern; the cutting conditions of the ultrathin glass master slice in the etching solution are as follows: the temperature is 60 ℃, and the time is 50 min;
step S6, taking the glue layer and the ultrathin glass cover plate together, taking the etching solution out, and separating the glue layer and the ultrathin glass cover plate;
step S7, gripping the ultrathin glass cover plate by using a sucker or a manipulator and soaking the ultrathin glass cover plate in an ink removing agent to remove the acid-resistant ink on the front surface and the back surface of the ultrathin glass cover plate;
and step S8, drying the ultra-thin glass cover plate with the acid-resistant ink removed at the temperature of 150 ℃.
And (3) placing the ultrathin glass cover plate in a chemical strengthening salt bath for ion exchange to obtain the ultrathin strengthened glass cover plate, wherein the chemical strengthening salt bath is a pure potassium nitrate salt bath, the ion exchange temperature is 400 ℃, and the ion exchange time is 100 min.
Thus, the front surface and the back surface of the obtained ultrathin tempered glass cover plate are provided with compression stress layers with the depth of about 20 um.
Through tests, the 180-degree folding times can reach more than 25 ten thousand times under the condition that the folding radius is less than 5 mm.
Example 2
Step S1, preparing plate glass with a front surface and a back surface which are opposite and have a thickness of 0.3mm, wherein the plate glass is made of high-alumina sodium glass, polishing the back surface of the plate glass until the back surface is a smooth and flat surface, and then printing the acid-resistant ink on the whole back surface of the plate glass by a screen printing method;
step S2, fixing the flat glass with the back surface coated with the acid-resistant ink on a base made of glass with the whole surface coated with the acid-resistant ink, wherein the upper surface of the base is a supporting surface for bearing the flat glass, acid-resistant glue is coated on the supporting surface of the base to form a glue layer, the back surface of the flat glass is supported on the glue layer, and the side surface of the flat glass is completely glued with the glue layer;
step S3, etching and thinning the front side of the plate glass to obtain an ultrathin glass master slice with the thickness of 75 um;
step S4, acid-resistant ink corresponding to a cutting pattern is distributed on the front surface of the ultrathin glass master slice, and the cutting pattern is a square with four corners chamfered as shown in FIG. 2;
step S5, immersing the ultrathin glass master slice in etching solution for processing for a certain time to obtain an ultrathin glass cover plate with the shape consistent with the cutting pattern; the cutting conditions of the ultrathin glass master slice in the etching solution are as follows: the temperature is 40 ℃, and the time is 40 min;
step S6, taking the glue layer and the ultrathin glass cover plate together, taking the etching solution out, and separating the glue layer and the ultrathin glass cover plate;
step S7, grabbing the ultra-thin glass cover plate by a sucker or a manipulator and soaking the ultra-thin glass cover plate in an ink removing agent to remove acid-resistant ink on the front surface and the back surface of the ultra-thin glass cover plate;
and step S8, drying the ultra-thin glass cover plate with the acid-resistant ink removed at the temperature of 110 ℃.
And (2) placing the ultrathin glass cover plate in a chemical strengthening salt bath for ion exchange to obtain the ultrathin strengthening glass cover plate, wherein the chemical strengthening salt bath is a mixed salt bath of potassium nitrate and sodium nitrate, the ratio is 90:10, the ion exchange temperature is 380 ℃, and the ion exchange time is 60 min.
Thus, the front surface and the back surface of the obtained ultrathin tempered glass cover plate are provided with compressive stress layers with the depth of about 14.8 um.
Through tests, the 180-degree folding times can reach more than 23 ten thousand times under the condition that the folding radius is less than 5 mm.
Example 3
Step S1, preparing sheet glass with the front and the back which are opposite and the thickness of which is 0.25mm, wherein the material of the glass is high-alumina lithium sodium glass, firstly polishing the back of the sheet glass until the back is a smooth and flat surface, and then printing the acid-resistant ink on the whole back of the sheet glass by adopting a screen printing method;
step S2, fixing the flat glass with the back surface coated with the acid-resistant ink on a base made of glass with the whole surface coated with the acid-resistant ink, wherein the upper surface of the base is a supporting surface for bearing the flat glass, acid-resistant glue is coated on the supporting surface of the base to form a glue layer, the back surface of the flat glass is supported on the glue layer, and the side surface of the flat glass is completely glued with the glue layer;
step S3, etching and thinning the front side of the plate glass to obtain an ultrathin glass master slice with the thickness of 50 um;
step S4, acid-resistant ink corresponding to a cutting pattern is distributed on the front surface of the ultrathin glass master slice, wherein the cutting pattern is a rectangle with four corners chamfered and a round hole left at a position close to one short edge as shown in figure 3;
step S5, immersing the ultrathin glass master slice in etching solution for processing for a certain time to obtain an ultrathin glass cover plate with the shape consistent with the cutting pattern; the cutting conditions of the ultrathin glass master slice in the etching solution are as follows: the temperature is 20 ℃, and the time is 30 min;
step S6, taking the glue layer and the ultrathin glass cover plate out of the etching solution, and separating the glue layer and the ultrathin glass cover plate;
step S7, gripping the ultrathin glass cover plate by using a sucker or a manipulator and soaking the ultrathin glass cover plate in an ink removing agent to remove the acid-resistant ink on the front surface and the back surface of the ultrathin glass cover plate;
and step S8, drying the ultra-thin glass cover plate with the acid-resistant ink removed at the temperature of 60 ℃.
And (2) placing the ultrathin glass cover plate in a chemical strengthening salt bath for ion exchange to obtain the ultrathin strengthening glass cover plate, wherein the chemical strengthening salt bath is a mixed salt bath of potassium nitrate and sodium nitrate, the ratio is 70:30, the ion exchange temperature is 370 ℃, and the ion exchange time is 15 min.
Thus, the front surface and the back surface of the obtained ultrathin tempered glass cover plate are provided with the compressive stress layers with the depth of about 9.8 um.
Through tests, the 180-degree folding times can reach more than 20 ten thousand times under the condition that the folding radius is less than 5 mm.
Example 4
It differs from example 1 in that:
in step S1, a sheet glass having a front surface and a back surface opposite to each other and a thickness of 0.45mm is prepared, the sheet glass is made of soda-alumina glass, the back surface of the sheet glass is polished and polished until the back surface is a smooth and flat surface, then a reserved seam having a depth of 2um and corresponding to the cutting pattern is formed on the back surface of the sheet glass by a laser cutting method, and then the acid-resistant ink is printed on the entire back surface of the sheet glass by a screen printing method.
In the step S2, a paper sheet is used instead of the glue layer.
Example 5
It differs from example 1 in that:
in step S1, a sheet glass having a thickness of 0.45mm with front and back surfaces facing each other is prepared, the back surface of the sheet glass is first polished and ground until the back surface is a smooth flat surface, then an acid-resistant ink corresponding to the cutting pattern is applied to the back surface of the sheet glass, then the back surface of the sheet glass is treated with the etching solution for a certain time to obtain a reserved seam having a depth of 2um and a contour corresponding to the cutting pattern, and then the acid-resistant ink is printed on the entire back surface of the sheet glass by a screen printing method.
In the step S2, a plastic sheet is used instead of the glue layer.
Example 6
It differs from example 1 in that:
between the step S6 and the step S7, a step SA is implemented: after the plurality of ultra-thin glass cover plates obtained in the step S6 are laminated, the side edges of the plurality of ultra-thin glass cover plates are polished by the etching solution. Therefore, the edge of the ultrathin glass cover plate is further ensured to be smooth and flat.
Examples embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the scope of the present invention, without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The preparation method of the ultrathin glass cover plate is characterized in that acid-resistant ink corresponding to a cutting pattern is sprayed on the front surface of the ultrathin glass cover plate by using etching liquid, and an ultrathin glass mother sheet with the thickness of less than or equal to 150 mu m and the acid-resistant ink arranged on the back surface of the ultrathin glass cover plate is etched into the ultrathin glass cover plate with the shape consistent with the cutting pattern;
the preparation method comprises the following steps:
step S1, preparing plate glass with opposite front and back surfaces, and laying acid-resistant ink on the back surface of the plate glass;
step S2, fixing the plate glass with the back surface coated with the acid-resistant ink on a base, wherein the base is provided with a supporting surface for bearing the plate glass, an acid-resistant glue layer or a spacer is arranged on the supporting surface, the back surface of the plate glass is supported on the glue layer or the spacer, and the side surface of the plate glass is completely glued with the glue layer or the spacer; the glue layer is provided with a bottom wall and a peripheral side wall connected with the bottom wall, the back surface of the plate glass supports the bottom wall of the glue layer, and four side surfaces of the plate glass are completely bonded with the peripheral side wall;
step S3, etching and thinning the front side of the plate glass to obtain an ultrathin glass master slice with the thickness less than or equal to 150 um;
step S4, acid-resistant ink corresponding to the cutting pattern is distributed on the front surface of the ultrathin glass master slice;
step S5, immersing the ultrathin glass master slice in etching solution for processing for a certain time to obtain an ultrathin glass cover plate with the shape consistent with the cutting pattern;
step S6, taking the glue layer and the ultrathin glass cover plate together, taking the etching solution out, and separating the glue layer and the ultrathin glass cover plate;
step S7, removing the acid-resistant ink on the front surface and the back surface of the ultrathin glass cover plate;
the back surface of the plate glass in the step S1 is provided with a reserved seam corresponding to the cutting pattern, and the depth of the reserved seam is at least 2 um.
2. The method for manufacturing an ultra-thin glass cover plate according to claim 1, wherein step SA is performed between step S6 and step S7: after the plurality of ultra-thin glass cover plates obtained in the step S6 are laminated, the side edges of the plurality of ultra-thin glass cover plates are polished by the etching solution.
3. The method for manufacturing an ultra-thin glass cover plate according to claim 1, wherein the step S3 includes a step S31 and a step S32, wherein,
step S31 is to perform etching and thinning treatment on the plate glass for a certain time by using the etching solution;
the step S32 is to carry out etching thinning treatment on the plate glass for a certain time by using a chemical cutting liquid with lower etching capability than the etching liquid;
the step S31 is performed before or after the step S32, and the steps S31 and S32 are performed once or repeatedly performed a plurality of times.
4. The method for manufacturing an ultra-thin glass cover plate according to claim 1, further comprising step S01 or step S02, wherein,
step S01 is to form the reserved seam on the back surface of the flat glass by using a laser cutting method;
in the step S02, acid-resistant ink corresponding to the cutting pattern is first applied to the back surface of the plate glass, and then the etching solution is used to treat the back surface of the plate glass for a certain time to obtain the reserved seam;
the step S01 or the step S02 is implemented before the step S1.
5. The method for manufacturing an ultra-thin glass cover plate according to claim 1, wherein the back surface of the flat glass described in step S1 is smooth.
6. The method for manufacturing an ultra-thin glass cover plate according to claim 1, wherein the thickness of the flat glass is 0.3 ± 0.15 mm.
7. An ultra-thin glass cover sheet, characterized by being produced according to the production method as recited in any one of claims 1 to 6.
8. The preparation method of the ultrathin tempered glass cover plate is characterized by comprising the following steps of:
preparing an ultra-thin glass cover plate according to the production method as set forth in any one of claims 1 to 6;
and placing the ultrathin glass cover plate in a chemical strengthening salt bath for ion exchange to obtain the ultrathin strengthened glass cover plate.
9. An ultra-thin strengthened glass cover sheet prepared according to the method of claim 8, wherein the front or back surface of the ultra-thin strengthened glass cover sheet has a compressive stress layer with a depth of less than 20% of its thickness.
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| CN201910738969.1A CN112390536B (en) | 2019-08-12 | 2019-08-12 | Ultrathin glass cover plate, ultrathin strengthened glass cover plate and preparation method of ultrathin glass cover plate |
| PCT/CN2020/108230 WO2021027781A1 (en) | 2019-08-12 | 2020-08-10 | Ultrathin glass cover plate and ultrathin tempered glass cover plate, and preparation methods therefor |
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| CN113754300A (en) * | 2021-09-16 | 2021-12-07 | 深圳市信濠光电科技股份有限公司 | Gradual thinning process of foldable glass |
| CN114105483A (en) * | 2021-11-19 | 2022-03-01 | 赛德半导体有限公司 | Ultra-thin glass strengthening method, ultra-thin glass, display screen and touch display device |
| CN114394757A (en) * | 2021-11-28 | 2022-04-26 | 凯盛科技股份有限公司蚌埠华益分公司 | Method for manufacturing ultrathin glass by single-side etching and ultrathin glass |
| CN114573243A (en) * | 2022-04-21 | 2022-06-03 | 江西沃格光电股份有限公司 | Ultrathin glass thinning process |
| CN114605081B (en) * | 2022-04-27 | 2024-05-14 | 江西沃格光电股份有限公司 | Preparation method of low-fragment-rate ultrathin glass |
| CN114873926B (en) * | 2022-05-20 | 2023-08-22 | 苏州瑞资特智能科技有限公司 | Thinning production process method of UTG ultrathin flexible glass |
| CN114804645B (en) * | 2022-05-30 | 2023-11-24 | 江西沃格光电股份有限公司 | Through hole etching method for large-size ultrathin glass substrate |
| CN115304286B (en) * | 2022-08-22 | 2023-07-25 | 浙江清华柔性电子技术研究院 | Ultrathin glass cover plate and preparation method thereof |
| CN115394199B (en) * | 2022-08-31 | 2023-12-08 | 武汉华星光电半导体显示技术有限公司 | Display device and preparation method thereof |
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| CN103226425A (en) * | 2013-04-24 | 2013-07-31 | 浙江金指科技有限公司 | OGS (one glass solution) capacitive touch screen cover glass processing method |
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| CN106830695A (en) * | 2017-03-14 | 2017-06-13 | 凯盛科技股份有限公司 | A kind of anti-fragmentation fixing device for glass substrate thinning single surface |
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| CN112390536A (en) | 2021-02-23 |
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