WO2021027781A1 - 超薄玻璃盖板、超薄强化玻璃盖板及其制备方法 - Google Patents

超薄玻璃盖板、超薄强化玻璃盖板及其制备方法 Download PDF

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Publication number
WO2021027781A1
WO2021027781A1 PCT/CN2020/108230 CN2020108230W WO2021027781A1 WO 2021027781 A1 WO2021027781 A1 WO 2021027781A1 CN 2020108230 W CN2020108230 W CN 2020108230W WO 2021027781 A1 WO2021027781 A1 WO 2021027781A1
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WIPO (PCT)
Prior art keywords
ultra
glass cover
cover plate
thin
glass
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PCT/CN2020/108230
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English (en)
French (fr)
Inventor
胡伟
索平平
郭顺鹏
Original Assignee
重庆鑫景特种玻璃有限公司
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Publication of WO2021027781A1 publication Critical patent/WO2021027781A1/zh

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Classifications

    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to the technical field of display screen protective covers, in particular to a protective cover used as a display screen in a smart phone or a tablet computer or a television device, and more specifically, to an ultra-thin glass cover plate and an ultra-thin strengthened glass Cover plate and preparation method thereof.
  • the current folding screen mobile phones are designed based on the flexible screen of OLED organic light-emitting diode technology, and the protective cover on the OLED flexible screen is mostly made of plastic flexible material.
  • the plastic cover has good toughness and basically meets the folding requirements,
  • the plastic cover is easy to scratch, has low impact resistance, and is not resistant to falling. It cannot protect the display well, and it will cause surface cracks and deformation after folding many times.
  • the screen is prone to defects such as cracks and ripples, which directly affect the use of the product and reduce the life of the product.
  • the conventional glass cover plate has poor bendability, which is not conducive to the bending of the OLED flexible screen.
  • some glass manufacturers have proposed plans to make glass cover plates with ultra-thin glass.
  • the problem with the existing solutions is that in the glass production process, larger-sized ultra-thin glass substrates must be processed to have target specific, Smaller size ultra-thin glass covers can only be put into use.
  • Mechanical cutting and laser cutting are the most common methods of cutting glass. Whether mechanical cutting or laser cutting is used, the glass is very easy to produce microscopic particles on the cutting edge of the glass during cutting. Cracks, and micro-cracks at the cutting edge will greatly reduce the strength of the glass and make the glass unable to bend.
  • An object of the present invention is to provide a method for preparing an ultra-thin glass cover plate in view of the above-mentioned problems in the prior art.
  • various target patterns can be flexibly and directly made, and the In the process of cutting ultra-thin glass into a small-size ultra-thin glass cover, because there will be no external mechanical stress acting on the large-size ultra-thin glass, there will be no cracks and breakages on the cutting edge of the ultra-thin glass cover. Therefore, it is ensured that the ultra-thin glass cover plate prepared by the preparation method has better strength, and can obtain higher strength through chemical strengthening, and is finally applied on the OLED flexible screen.
  • Another object of the present invention is to provide an ultra-thin glass cover plate prepared by the above preparation method.
  • Another object of the present invention is to provide a method for preparing an ultra-thin strengthened glass cover plate, the preparation method is to use the above-mentioned ultra-thin glass cover plate for chemical strengthening to obtain an ultra-thin strengthened glass cover plate, and obtain an ultra-thin strengthened glass cover plate with further improved strength Thin tempered glass cover.
  • the bending resistance of the ultra-thin strengthened glass cover is greatly improved. When the folding radius is less than 5mm, the number of 180° folding can reach more than 200,000 times.
  • Another object of the present invention is to provide an ultra-thin strengthened glass cover plate prepared by the above preparation method.
  • the method for preparing an ultra-thin glass cover plate is to spray an acid-resistant ink corresponding to the cutting pattern on the front side with an acid-resistant ink on the back side, and an ultra-thin glass with a thickness of 150um or less.
  • the mother sheet is etched into an ultra-thin glass cover plate with a shape consistent with the cutting pattern.
  • the ultra-thin glass mother sheet is directly divided into ultra-thin glass cover plates by means of chemical etching, so there will be no external mechanical stress acting on the large-size ultra-thin glass, so the cutting edge of the ultra-thin glass cover There will be no cracks and breakage.
  • an acid-resistant ink can be used to form cutting patterns of any shape, so the shape and contour of the ultra-thin glass cover obtained by the preparation method are also arbitrary, so as to adapt to different brands and types of mobile phone screens.
  • Step S1 preparing a plate glass with opposite front and back surfaces, and disposing an acid-resistant ink on the back of the plate glass;
  • Step S2 Fix the plate glass with acid-resistant ink on the back on the base.
  • the base has a supporting surface for receiving the plate glass, and the supporting surface is provided with an acid-resistant glue layer or spacer.
  • the back surface of the plate glass is supported by the glue layer or the spacer, and the side surface of the plate glass is completely glued to the glue layer or the spacer;
  • Step S3 etching and thinning the front surface of the flat glass to obtain an ultra-thin mother glass with a thickness of 150um or less;
  • Step S4 disposing an acid-resistant ink corresponding to the cutting pattern on the front surface of the ultra-thin glass mother sheet;
  • Step S5 immersing the ultra-thin glass mother sheet in an etching solution for a certain period of time to obtain an ultra-thin glass cover plate with a shape consistent with the cutting pattern;
  • Step S6 taking out the etching solution together with the glue layer and the ultra-thin glass cover plate, and then separating the glue layer and the ultra-thin glass cover plate;
  • Step S7 removing the acid-resistant ink on the front and back of the ultra-thin glass cover plate.
  • step SA is implemented between the step S6 and the step S7: a plurality of the ultra-thin glass cover obtained in the step S6 After the plates are laminated, the sides of the multiple ultra-thin glass covers are polished with the etching solution.
  • the step S3 includes step S31 and step S32, wherein,
  • the step S31 is to etch and thin the flat glass for a certain period of time by using the etching solution
  • the step S32 is to etch and thin the flat glass for a certain period of time by using a chemical cutting fluid with a lower etching ability than the etching fluid;
  • the step S31 is implemented before or after the step S32, and the step S31 and the step S32 are implemented once or repeated multiple times.
  • the back of the flat glass in the step S1 has a reserved seam corresponding to the cutting pattern, and the depth of the reserved seam is at least 2um.
  • step S01 or step S02 As a preferred solution of the method for preparing the ultra-thin glass cover provided by the present invention, it further includes step S01 or step S02, wherein,
  • the step S01 is to use a laser cutting method to form the reserved seam on the back of the flat glass
  • step S02 an acid-resistant ink corresponding to the cutting pattern is first arranged on the back of the flat glass, and then the back of the flat glass is treated with the etching solution for a certain period of time to obtain the reserved seam;
  • step S01 or the step S02 is implemented before the step S1.
  • the back of the flat glass described in the step S1 is a smooth surface.
  • the thickness of the flat glass is 0.3 ⁇ 0.15 mm.
  • the etching solution is an acidic aqueous solution containing fluoride ions, and the etching solution also contains at least one of sulfate or nitrate.
  • the acid-resistant ink contains 50% acrylic resin by weight percentage: 65-75%; rosin: 15-20%; alcohol-soluble red B :0.5-1.0%; n-butanol: 15-20%; the weight percentage of each component of the 50% acrylic resin is: methyl methacrylate: 12-22%; butyl acrylate: 8-12%; benzene Ethylene: 6-10%; Methacrylic acid: 10-20%; Benzoyl peroxide: 0.5-1.5%; Xylene: 44-54%.
  • the glue layer is formed by coating and curing acid-resistant glue on the supporting surface of the base, and the acid-proof glue is UV glue Or thermosetting glue.
  • the present invention also provides an ultra-thin glass cover plate, which is prepared according to the above-mentioned preparation method.
  • the present invention also provides a method for preparing an ultra-thin strengthened glass cover plate, which includes the following steps:
  • the ultra-thin glass cover plate is placed in a chemically strengthened salt bath for ion exchange to obtain the ultra-thin strengthened glass cover plate.
  • the present invention also provides an ultra-thin strengthened glass cover, which is prepared according to the above-mentioned preparation method, and the front or back of the ultra-thin strengthened glass cover has a depth of less than 20% of its own thickness. Compressive stress layer.
  • the preparation method of the ultra-thin glass cover has the following beneficial effects: the preparation method is to spray the front side with an acid-resistant ink corresponding to the cutting pattern by using an etching solution, and the back side is provided with
  • the ultra-thin glass mother sheet with the thickness of the acid-resistant ink less than or equal to 150um is etched into an ultra-thin glass cover plate with a shape consistent with the cutting pattern.
  • the ultra-thin glass mother sheet is directly divided into ultra-thin glass cover plates by means of chemical etching, so there will be no external mechanical stress acting on the large-size ultra-thin glass, so the cutting edge of the ultra-thin glass cover There will be no cracks and breakage.
  • an acid-resistant ink can be used to form cutting patterns of any shape, so the shape and contour of the ultra-thin glass cover obtained by the preparation method are also arbitrary, so as to adapt to different brands and types of mobile phone screens.
  • Figure 1 is a shape of the cutting pattern mentioned in the present invention.
  • Figure 2 is another shape of the cutting pattern mentioned in the present invention.
  • Figure 3 is another shape of the cutting pattern mentioned in the present invention.
  • FIG. 4 is the first operation schematic diagram of the preparation method of the ultra-thin glass cover provided by the present invention.
  • FIG. 5 is a second schematic diagram of the operation of the method for preparing the ultra-thin glass cover provided by the present invention.
  • Fig. 6 is the third operation schematic diagram of the preparation method of the ultra-thin glass cover provided by the present invention.
  • FIG. 7 is the fourth operation schematic diagram of the preparation method of the ultra-thin glass cover provided by the present invention.
  • FIG. 8 is the fifth operation schematic diagram of the preparation method of the ultra-thin glass cover plate provided by the present invention.
  • the preparation method of the ultra-thin glass cover plate provided by the present invention is to use an etching solution to spray an acid-resistant ink corresponding to the cutting pattern on the front side and the entire back side with an acid-resistant ink sprayed on an ultra-thin glass mother film with a thickness of less than or equal to 150um.
  • An ultra-thin glass cover plate consistent with the cutting pattern can be divided into the following steps:
  • Step S1 Prepare a plate glass with opposite front and back surfaces, and arrange an acid-resistant ink on the back of the plate glass; preferably, the thickness of the plate glass is 0.3 ⁇ 0.15 mm, and the thickness of the plate glass can be controlled by It can be achieved by precision polishing. Of course, it can also be screened by precision measurement.
  • the composition of the anti-acid ink is, by weight percentage, containing 50% acrylic resin: 65-75%; rosin: 15-20%; alcohol-soluble red B: 0.5-1.0%; n-butanol: 15 -20%; the weight percentage of each component of the 50% acrylic resin is: methyl methacrylate: 12-22%; butyl acrylate: 8-12%; styrene: 6-10%; methacrylic acid: 10-20%; Benzoyl peroxide: 0.5-1.5%; Xylene: 44-54%.
  • the acid-resistant ink can be applied on the back of the flat glass by means of screen printing, laminated film processing, or resist coating photolithography.
  • the screen printing method, the laminated film processing method or the resist coating photolithography method are all conventional techniques, so they will not be repeated here.
  • the back of the flat glass is a smooth surface, that is, the back of the flat glass is a smooth and flat surface.
  • Step S2 Fix the plate glass with acid-resistant ink on the back on the base.
  • the base has a supporting surface for receiving the plate glass, and the supporting surface is provided with an acid-resistant glue layer.
  • the back of the plate glass is supported by the glue layer, and the side surface of the plate glass is completely glued to the glue layer (see FIG. 4); specifically, the glue layer has a bottom wall and a circumference connected to the bottom wall.
  • the glue layer has a bottom wall and a circumference connected to the bottom wall.
  • the back of the plate glass is supported by the bottom wall of the glue layer, and the four sides of the plate glass are completely adhered to the peripheral side wall, thereby positioning the plate glass.
  • the glue layer is formed by coating and curing acid-resistant glue on the supporting surface of the base, and the acid-proof glue is UV glue or thermosetting glue; the function of the glue layer is to Support and fix the flat glass.
  • the base may be made of non-metallic materials such as plastic or glass, and has at least one flat surface as the supporting surface.
  • the entire surface of the base is coated with the acid-resistant ink to ensure that the base is not corroded in subsequent steps.
  • Step S3 etching and thinning the front surface of the flat glass to obtain an ultra-thin mother glass with a thickness of 150um or less (see FIG. 5); the glass etching and thinning process is a relatively mature technology, so it will not be repeated here.
  • the step S3 includes steps S31 and S32, wherein the step S31 is to use the etching liquid to perform an etching and thinning treatment on the flat glass for a certain period of time; the step S32 is to use the etching ability to compare The chemical cutting liquid with lower etching liquid is used to etch and thin the plate glass for a certain period of time; the step S31 is implemented before or after the step S32, and the step S31 and the step S32 are implemented once or repeatedly repeatedly.
  • the chemical cutting fluid is an acidic aqueous solution containing fluoride ions.
  • the edge of the plate glass will have products produced by the reaction between the etching solution and the plate glass, and the plate glass is placed
  • a chemical cutting fluid with low etching ability or a pure aqueous solution the product can be dissolved and removed very well. After so many times of repetition, a better etching and cutting effect can be obtained.
  • Step S4 spray an acid-resistant ink corresponding to the cutting pattern on the front surface of the ultra-thin glass mother sheet (see Figure 6); similarly, the acid-resistant ink can be screen printed, laminated film processing or resist Coating photolithography is applied on the front side of the flat glass.
  • the cutting pattern depends on the product requirements. For example, it can be a rectangle with four corners chamfered (see Figure 1), or a square with four corners chamfered (see Figure 2), or four corners are chamfered near a short A rectangle with round holes on the sides (see Figure 3).
  • Step S5 immersing the ultra-thin glass mother sheet in an etching solution for a certain period of time to obtain an ultra-thin glass cover plate with a shape consistent with the cutting pattern (see FIG. 7); preferably, the etching solution contains fluorine An acidic aqueous solution of ions, the etching solution further contains at least one of sulfate or nitrate.
  • the etching solution is composed of hydrofluoric acid 3-7%, hydrochloric acid 8-15%, alkali metal nitrate (or alkali metal sulfate) 8-10%, and the balance is water.
  • the cutting conditions of the ultra-thin glass mother sheet in the etching solution are: a temperature of 20-60° C.
  • the ultra-thin mother glass is etched into a plurality of ultra-thin glass cover plates separated from each other.
  • the ultra-thin glass cover plate can be relatively stably attached to the glue layer without moving with the flow of the etching solution.
  • Step S6 take out the etching solution together with the glue layer and the ultra-thin glass cover plate, and then separate the glue layer and the ultra-thin glass cover plate (see FIG. 8); in this step, a suction cup is used The adhesive layer is sucked and taken out from the etching solution together with the ultra-thin glass cover plate.
  • Step S7 remove the acid-resistant ink on the front and back of the ultra-thin glass cover; specifically, the acid-resistant ink can be quickly returned under the action of a specific deinking agent, and can be used in the deinking process
  • a suction cup or a manipulator grabs the ultra-thin glass cover and soaks it in the deinking agent.
  • the ultra-thin glass cover can also be placed in a closed container to carbonize and pulverize the acid-resistant ink at a high temperature, thereby removing the acid-resistant ink.
  • Step S8 drying the ultra-thin glass cover plate after removing the acid-resistant ink at a temperature of 60-150°C.
  • the ultra-thin glass cover provided by the present invention can be obtained without cracks and breakage at the edge, thereby having better strength, and can obtain higher strength through chemical strengthening, and finally applied to the OLED flexible screen.
  • the etching liquid, chemical cutting liquid, acid-resistant ink, and deinking agent used in the above steps are all commercially available products.
  • the back of the flat glass in the step S1 has a reserved slit corresponding to the cutting pattern, and the depth of the reserved slit is at least 2um.
  • the reserved seam can be formed by implementing step S01 or step S02 before step S1.
  • the step S01 is to use a laser cutting method to form a reserved seam on the back of the plate glass; the step S02 is to first lay an acid-resistant ink corresponding to the cutting pattern on the back of the plate glass, and then After processing the back surface of the flat glass with the etching solution for a certain period of time, the reserved seam is obtained.
  • the purpose of forming a reserved seam on the back of the flat glass is to cut the ultra-thin glass mother plate from top to bottom when the ultra-thin glass mother plate is front-etched in step S5.
  • the ultra-thin glass mother sheet is more easily etched through, so that it is easier to obtain an ultra-thin glass cover with a corresponding shape board.
  • step SA is performed between step S6 and step S7: after laminating the plurality of ultra-thin glass cover plates obtained in step S6, use the etching solution Polishing the sides of the plurality of ultra-thin glass covers. In this way, it is further ensured that the edge of the ultra-thin glass cover plate is smooth and flat.
  • an acid-resistant spacer can also be used to replace the glue layer, and the spacer can be a paper sheet or a plastic sheet or a sheet made of other acid-resistant materials.
  • the spacer is not adhered to the plate glass and the base, which facilitates subsequent separation operations.
  • the preparation method of the ultra-thin strengthened glass cover plate provided by the present invention includes the following steps:
  • An ultra-thin glass cover plate is prepared according to steps S1-step S7, and then, the ultra-thin glass cover plate is placed in a chemically strengthened salt bath for ion exchange to obtain the ultra-thin strengthened glass cover plate.
  • the front or back of the ultra-thin strengthened glass cover plate has a compressive stress layer with a depth less than 20% of its own thickness.
  • the bending resistance of the ultra-thin strengthened glass cover plate prepared through the above steps is greatly improved.
  • the folding radius is less than 5 mm, the number of 180° folding times can reach more than 200,000 times.
  • Step S1 Prepare a flat glass with a thickness of 0.45mm with opposite front and back sides.
  • the material of the flat glass is high alumina sodium glass. First, polish and polish the back of the flat glass until the back is smooth and flat. , And then use the screen printing method to print the acid-resistant ink on the entire back of the flat glass;
  • Step S2 fixing the plate glass with the acid-resistant ink on the back on the base of the glass material coated with the acid-resistant ink on all surfaces, and the upper surface of the base is used for receiving the plate glass Supporting surface, coating acid-resistant glue on the supporting surface of the base to form a glue layer, the back of the plate glass is supported on the glue layer, and the side surface of the plate glass is completely glued to the glue layer;
  • Step S3 etching and thinning the front surface of the flat glass to obtain an ultra-thin mother glass with a thickness of 100um;
  • Step S4 disposing an acid-resistant ink corresponding to a cutting pattern on the front surface of the ultra-thin glass mother sheet, and the cutting pattern is a rectangle with four corners chamfered as shown in FIG. 1;
  • Step S5 immersing the ultra-thin glass mother sheet in the etching solution for a certain period of time to obtain an ultra-thin glass cover plate with a shape consistent with the cutting pattern; cutting of the ultra-thin glass mother sheet in the etching solution
  • the conditions are: temperature 60°C, time 50min;
  • Step S6 taking out the etching solution together with the glue layer and the ultra-thin glass cover plate, and then separating the glue layer and the ultra-thin glass cover plate;
  • Step S7 using a suction cup or a manipulator to grab the ultra-thin glass cover and immerse it in the de-inking agent to remove the acid-resistant ink on the front and back of the ultra-thin glass cover;
  • Step S8 drying the ultra-thin glass cover plate after removing the acid-resistant ink at a temperature of 150°C.
  • the ultra-thin glass cover plate is placed in a chemically strengthened salt bath for ion exchange to obtain the ultra-thin strengthened glass cover plate.
  • the chemically strengthened salt bath is a pure potassium nitrate salt bath, the ion exchange temperature is 400°C, and the ion exchange time For 100min.
  • the obtained ultra-thin strengthened glass cover plate has a compressive stress layer with a depth of about 20 um on the front and back sides.
  • the number of 180° folds can reach more than 250,000 times.
  • Step S1 Prepare a plate glass with a thickness of 0.3mm with opposite front and back surfaces.
  • the material of the plate glass is high alumina sodium glass. First, polish and polish the back surface of the plate glass until the back surface is smooth and flat. , And then use the screen printing method to print the acid-resistant ink on the entire back of the flat glass;
  • Step S2 fixing the plate glass with the acid-resistant ink on the back on the base of the glass material coated with the acid-resistant ink on all surfaces, and the upper surface of the base is used for receiving the plate glass Supporting surface, coating acid-resistant glue on the supporting surface of the base to form a glue layer, the back of the plate glass is supported on the glue layer, and the side surface of the plate glass is completely glued to the glue layer;
  • Step S3 etching and thinning the front surface of the flat glass to obtain an ultra-thin mother glass with a thickness of 75um;
  • Step S4 disposing an acid-resistant ink corresponding to a cutting pattern on the front surface of the ultra-thin glass mother sheet, and the cutting pattern is a square with four corners chamfered as shown in FIG. 2;
  • Step S5 immersing the ultra-thin glass mother sheet in the etching solution for a certain period of time to obtain an ultra-thin glass cover plate with a shape consistent with the cutting pattern; cutting of the ultra-thin glass mother sheet in the etching solution
  • the conditions are: temperature 40°C, time 40min;
  • Step S6 taking out the etching solution together with the glue layer and the ultra-thin glass cover plate, and then separating the glue layer and the ultra-thin glass cover plate;
  • Step S7 using a suction cup or a manipulator to grab the ultra-thin glass cover and immerse it in the de-inking agent to remove the acid-resistant ink on the front and back of the ultra-thin glass cover;
  • Step S8 drying the ultra-thin glass cover plate after removing the acid-resistant ink at a temperature of 110°C.
  • the ultra-thin glass cover plate is placed in a chemically strengthened salt bath for ion exchange to obtain the ultra-thin strengthened glass cover plate.
  • the chemically strengthened salt bath is a mixed salt bath of potassium nitrate and sodium nitrate with a ratio of 90:10,
  • the ion exchange temperature is 380°C, and the ion exchange time is 60 minutes.
  • the obtained ultra-thin strengthened glass cover plate has a compressive stress layer with a depth of about 14.8 um on the front and back sides.
  • the number of 180° folding can reach more than 230,000 times.
  • Step S1 Prepare plate glass with a thickness of 0.25mm with opposite front and back sides.
  • the glass material is high-aluminum-lithium-sodium glass.
  • Step S2 fixing the plate glass with the acid-resistant ink on the back on the base of the glass material coated with the acid-resistant ink on all surfaces, and the upper surface of the base is used for receiving the plate glass Supporting surface, coating acid-resistant glue on the supporting surface of the base to form a glue layer, the back of the plate glass is supported on the glue layer, and the side surface of the plate glass is completely glued to the glue layer;
  • Step S3 etching and thinning the front surface of the flat glass to obtain an ultra-thin mother glass with a thickness of 50um;
  • Step S4 distributing an acid-resistant ink corresponding to a cutting pattern on the front surface of the ultra-thin glass mother sheet.
  • the cutting pattern is chamfered with four corners as shown in FIG. 3 and a circular hole is left adjacent to a short side. rectangle;
  • Step S5 immersing the ultra-thin glass mother sheet in the etching solution for a certain period of time to obtain an ultra-thin glass cover plate with a shape consistent with the cutting pattern; cutting of the ultra-thin glass mother sheet in the etching solution
  • the conditions are: temperature 20°C, time 30min;
  • Step S6 taking out the etching solution together with the glue layer and the ultra-thin glass cover plate, and then separating the glue layer and the ultra-thin glass cover plate;
  • Step S7 using a suction cup or a manipulator to grab the ultra-thin glass cover and immerse it in the de-inking agent to remove the acid-resistant ink on the front and back of the ultra-thin glass cover;
  • Step S8 drying the ultra-thin glass cover plate after removing the acid-resistant ink at a temperature of 60°C.
  • the ultra-thin glass cover plate is placed in a chemically strengthened salt bath for ion exchange to obtain the ultra-thin strengthened glass cover plate.
  • the chemically strengthened salt bath is a mixed salt bath of potassium nitrate and sodium nitrate with a ratio of 70:30,
  • the ion exchange temperature is 370°C, and the ion exchange time is 15 minutes.
  • the obtained ultra-thin strengthened glass cover plate has a compressive stress layer with a depth of about 9.8 um on the front and back sides.
  • the number of 180° folds can reach more than 200,000 times.
  • Embodiment 1 The difference from Embodiment 1 is:
  • step S1 prepare a plate glass with a thickness of 0.45mm with opposite front and back sides.
  • the material of the plate glass is high alumina sodium glass. Firstly, polish and polish the back of the plate glass until the back is smooth. Flatten the surface, and then use a laser cutting method to form a 2um depth profile on the back of the flat glass with a reserved seam corresponding to the cutting pattern, and then use a screen printing method to print the entire back of the flat glass.
  • the acid-resistant ink is used to print the entire back of the flat glass.
  • step S2 a paper sheet is used to replace the glue layer.
  • Embodiment 1 The difference from Embodiment 1 is:
  • step S1 prepare a plate glass with a thickness of 0.45mm with opposite front and back sides. First, polish and polish the back of the plate glass until the back is smooth and flat, and then lay on the back of the plate glass.
  • the acid-resistant ink corresponding to the cutting pattern is then used to process the back of the flat glass with the etching solution for a certain period of time to obtain a contour with a depth of 2um and the reserved seam corresponding to the cutting pattern, and then silk
  • the screen printing method prints the acid-resistant ink on the entire back of the plate glass.
  • step S2 a plastic sheet is used to replace the glue layer.
  • Embodiment 1 The difference from Embodiment 1 is:
  • Step SA is implemented between the step S6 and the step S7: after laminating the plurality of ultra-thin glass cover plates obtained in the step S6, the etching solution is used to laminate the plurality of ultra-thin glass cover plates. The sides of the glass cover are polished. In this way, it is further ensured that the edge of the ultra-thin glass cover plate is smooth and flat.

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Abstract

本发明公开了一种超薄玻璃盖板、超薄强化玻璃盖板及其制备方法。超薄玻璃盖板的制备方法是利用蚀刻液将正面喷涂有对应于切割图案的抗酸油墨、背面布设有抗酸油墨的厚度小于等于150um的超薄玻璃母片蚀刻成形状与所述切割图案一致的超薄玻璃盖板。如此，所述超薄玻璃母片直接通过化学腐蚀的手段被分割成超薄玻璃盖板，因而不会有外部机械应力作用在大尺寸超薄玻璃上，因此在超薄玻璃盖板的切割边缘不会有裂纹和破损。另外，利用抗酸油墨可以形成任何形状的切割图案，因此通过所述制备方法得到的超薄玻璃盖板的形状轮廓也是任意的，从而适应于不同品牌、类型的手机屏幕。

Description

超薄玻璃盖板、超薄强化玻璃盖板及其制备方法 技术领域
本发明涉及显示屏保护盖技术领域，具体涉及用作例如智能手机或平板电脑或电视设备中的显示屏中的保护盖，更具体而言，涉及一种超薄玻璃盖板、超薄强化玻璃盖板及其制备方法。
 背景技术
随着科技的进步，智能手机已经成为人们日常生活中必不可少的生产工具。为了提高对于视觉体验，比如在观看视频或者玩游戏等应用时，给用户带来更好的操作性和观赏性，手机生产商通过采用超窄边框技术、刘海屏技术、水滴屏技术尽可能的提高屏占比，以使同样的机身正面的面积可以容纳更大的屏幕。然而，受限于目前技术听筒、摄像头等位置摆放难点，屏占比很难做到100%，而且即使做到了100%屏占比，在手机体积受限的情况下，屏幕可显示区域做到7寸基本上达到极限了，因为手机再大就不便于人们的平时携带，会导致手机便于携带的这一根本优势的丢失。
为了突破上述限制，一些手机生产商提出了折叠屏手机。目前的折叠屏手机都是基于OLED有机发光二极管技术的柔性屏幕而设计的，而OLED柔性屏幕上的保护盖板多为塑料柔性材质，虽然塑料盖板拥有较好的韧性且基本符合折叠需求，但由于其力学性能的限制，塑料盖板易刮花、抗冲击强度较低、不耐摔，不能对显示屏起到很好的保护作用，而且在折叠多次之后会产生表面龟裂、变形且屏幕容易出现裂纹、波纹等缺陷，直接影响产品使用、降低了产品的寿命。而常规的玻璃盖板的可弯折性较差，不利于OLED柔性屏幕的弯折。于是，一些玻璃生产商提出了以超薄玻璃制作玻璃盖板的方案，但是现有方案中存在的问题在于，在玻璃生产工艺中，较大尺寸的超薄玻璃基板必须加工成具有目标特定、较小尺寸的超薄玻璃盖板才能投入使用，机械切割和激光切割是最常见的切割玻璃的方法，而无论是采用机械切割还是激光切割，在切割时玻璃极易在玻璃的切割边缘产生微裂纹，而在切割边缘处的微裂纹会大大降低玻璃的强度、并致使玻璃无法折弯，再者，带有较大边缘裂纹的玻璃在进行化学强化的过程中会在应力的作用下发生碎裂。而由于超薄玻璃的厚度太薄，在化学强化前，通过机械或化学方法来抛光去除边缘裂纹也是非常困难的，加工过程中的拾取、搬运都非常困难，极易导致玻璃破裂。
因此，有必要发明一种加工步骤连续易于实现的可以制得具有无微裂纹或很少微裂纹、保持玻璃自然状态边缘的超薄玻璃盖板的制备方法。
 技术问题
本发明的一个目的在于，针对现有技术存在的上述问题，提供一种超薄玻璃盖板的制备方法，采用所述制备方法，可以灵活的直接制成各种不同的目标图案，在将大尺寸超薄玻璃切割成小尺寸的超薄玻璃盖板的过程中由于不会有外部机械应力作用在大尺寸超薄玻璃上，因此在超薄玻璃盖板的切割边缘不会有裂纹和破损，从而保证由该制备方法制备得到的超薄玻璃盖板具有更好的强度，且可以通过化学强化获得更高的强度，最终应用在OLED柔性屏幕上。
 技术解决方案
本发明的另一个目的在于，提供一种由上述制备方法制得的超薄玻璃盖板。
本发明的再一个目的在于，提供一种超薄强化玻璃盖板的制备方法，所述制备方法是利用上述超薄玻璃盖板进行化学强化得到超薄强化玻璃盖板，得到强度进一步提升的超薄强化玻璃盖板。超薄强化玻璃盖板的可耐折弯能力大幅度提高，对折半径小于5mm的情况下，180°对折次数可达20万次以上。
本发明的又一个目的在于，提供一种由上述制备方法制得的超薄强化玻璃盖板。
为实现上述目的，本发明提供的超薄玻璃盖板的制备方法，是利用蚀刻液将正面喷涂有对应于切割图案的抗酸油墨、背面布设有抗酸油墨的厚度小于等于150um的超薄玻璃母片蚀刻成形状与所述切割图案一致的超薄玻璃盖板。如此，所述超薄玻璃母片直接通过化学腐蚀的手段被分割成超薄玻璃盖板，因而不会有外部机械应力作用在大尺寸超薄玻璃上，因此在超薄玻璃盖板的切割边缘不会有裂纹和破损。另外，利用抗酸油墨可以形成任何形状的切割图案，因此通过所述制备方法得到的超薄玻璃盖板的形状轮廓也是任意的，从而适应于不同品牌、类型的手机屏幕。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，包括如下步骤：
步骤S1，准备具有相对的正面和背面的平板玻璃，在所述平板玻璃的背面布设抗酸油墨；
步骤S2，将背面布设有抗酸油墨的平板玻璃固定在基座上，所述基座具有一个用于承接所述平板玻璃的支撑面，所述支撑面上设有抗酸的胶层或间隔物，所述平板玻璃的背面支撑于所述胶层或所述间隔物，所述平板玻璃的侧面完全与所述胶层或所述间隔物胶合；
步骤S3，对所述平板玻璃的正面进行蚀刻减薄处理以得到厚度小于等于150um的超薄玻璃母片；
步骤S4，在所述超薄玻璃母片的正面布设对应于切割图案的抗酸油墨；
步骤S5，将所述超薄玻璃母片浸没在蚀刻液中处理一定时间后得到形状与所述切割图案一致的超薄玻璃盖板；
步骤S6，将所述胶层与所述超薄玻璃盖板一起取出所述蚀刻液后分离所述胶层和所述超薄玻璃盖板；
步骤S7，祛除所述超薄玻璃盖板的正面和背面上的抗酸油墨。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，在所述步骤S6与所述步骤S7之间实施步骤SA：将由所述步骤S6中得到的多个所述的超薄玻璃盖板进行叠片后，用所述蚀刻液对多个所述超薄玻璃盖的侧边进行抛光。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述步骤S3包括步骤S31和步骤S32，其中，
所述步骤S31是利用所述蚀刻液对所述平板玻璃进行蚀刻减薄处理一定时间；
所述步骤S32是利用蚀刻能力相比所述蚀刻液更低的化学切割液对所述平板玻璃进行蚀刻减薄处理一定时间；
所述步骤S31在所述步骤S32之前或之后实施，所述步骤S31和所述步骤S32实施一次或重复实施多次。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述步骤S1中的所述平板玻璃的背面具有与所述切割图案对应的预留缝，所述预留缝的深度至少为2um。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，还包括步骤S01或步骤S02，其中，
所述步骤S01是采用激光切割的方法在所述平板玻璃的背面形成所述预留缝；
所述步骤S02是先在所述平板玻璃的背面布设对应于所述切割图案的抗酸油墨，后使用所述蚀刻液对所述平板玻璃的背面进行处理一定时间后得到所述预留缝；
所述步骤S01或所述步骤S02在所述步骤S1之前实施。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述步骤S1所描述的平板玻璃背面为光面。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述平板玻璃的厚度为0.3±0.15mm。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述蚀刻液为包含氟离子的酸性水溶液，所述蚀刻液中还包含硫酸根或硝酸根中的至少一种。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述抗酸油墨，按重量百分比计，包含50%丙烯酸树脂：65-75%；松香：15-20%；醇溶火红B：0.5-1.0%；正丁醇：15-20%；所述的50%丙烯酸树脂的各成分重量百分比为：甲基丙烯酸甲酯：12-22%；丙烯酸丁酯：8-12%；苯乙烯：6-10%；甲基丙烯酸：10-20%；过氧化苯甲酰：0.5-1.5%；二甲苯：44-54%。
作为本发明提供的超薄玻璃盖板的制备方法的优选方案，所述胶层是将抗酸胶涂布在所述基座的支撑面上固化而成的，所述抗酸胶为uv胶或热固胶。
为实现上述目的，本发明还提供了一种超薄玻璃盖板，按照如上所述的制备方法制备获得。
为实现上述目的，本发明还提供了一种超薄强化玻璃盖板的制备方法，包括如下步骤：
按照如上所述的制备方法制备超薄玻璃盖板；
将所述超薄玻璃盖板置于化学强化盐浴中进行离子交换，得到所述超薄强化玻璃盖板。
为实现上述目的，本发明还提供了一种超薄强化玻璃盖板，按照如上所述的制备方法制备获得，所述超薄强化玻璃盖板的正面或背面具有深度小于自身厚度的20%的压应力层。
 有益效果
与现有技术相比，实施本发明提供的超薄玻璃盖板的制备方法，具有如下有益效果：所述制备方法是利用蚀刻液将正面喷涂有对应于切割图案的抗酸油墨、背面布设有抗酸油墨的厚度小于等于150um的超薄玻璃母片蚀刻成形状与所述切割图案一致的超薄玻璃盖板。如此，所述超薄玻璃母片直接通过化学腐蚀的手段被分割成超薄玻璃盖板，因而不会有外部机械应力作用在大尺寸超薄玻璃上，因此在超薄玻璃盖板的切割边缘不会有裂纹和破损。另外，利用抗酸油墨可以形成任何形状的切割图案，因此通过所述制备方法得到的超薄玻璃盖板的形状轮廓也是任意的，从而适应于不同品牌、类型的手机屏幕。
 附图说明
图1为本发明提到的切割图案的一种形状；
图2为本发明提到的切割图案的另一种形状；
图3为本发明提到的切割图案的又一种形状；
图4为本发明提供的超薄玻璃盖板的制备方法的操作示意图一；
图5为本发明提供的超薄玻璃盖板的制备方法的操作示意图二；
图6为本发明提供的超薄玻璃盖板的制备方法的操作示意图三；
图7为本发明提供的超薄玻璃盖板的制备方法的操作示意图四；
图8为本发明提供的超薄玻璃盖板的制备方法的操作示意图五。
 本发明的实施方式
本发明提供的超薄玻璃盖板的制备方法是利用蚀刻液将正面喷涂有对应于切割图案的抗酸油墨、背面整个喷涂有抗酸油墨的厚度小于等于150um的超薄玻璃母片蚀刻成形状与所述切割图案一致的超薄玻璃盖板。具体可以分为以下几个步骤：
步骤S1，准备具有相对的正面和背面的平板玻璃，在所述平板玻璃的背面布设抗酸油墨；优选的，所述平板玻璃的厚度为0.3±0.15mm，所述平板玻璃的厚度控制可以通过精密抛光来实现，当然，也可以通过精密测量进行筛选。优选的，所述抗酸油墨的组成为，按重量百分比计，包含50%丙烯酸树脂：65-75%；松香：15-20%；醇溶火红B：0.5-1.0%；正丁醇：15-20%；所述的50%丙烯酸树脂的各成分重量百分比为：甲基丙烯酸甲酯：12-22%；丙烯酸丁酯：8-12%；苯乙烯：6-10%；甲基丙烯酸：10-20%；过氧化苯甲酰：0.5-1.5%；二甲苯：44-54%。抗酸油墨可以借助丝网印刷法、叠层薄膜加工法或抗蚀剂涂敷光刻法施加在所述平板玻璃的背面。丝网印刷法、叠层薄膜加工法或抗蚀剂涂敷光刻法均为常规技术，故此处不做赘述。优选的，我们采用丝网印刷法在所述平板玻璃的整个背面印刷所述抗酸油墨。可选的，所述平板玻璃的背面为光面，即所述平板玻璃的背面为光滑平整面。
步骤S2，将背面布设有抗酸油墨的平板玻璃固定在基座上，所述基座具有一个用于承接所述平板玻璃的支撑面，所述支撑面上设有抗酸的胶层，所述平板玻璃的背面支撑于所述胶层，所述平板玻璃的侧面完全与所述胶层胶合（参见图4）；具体的，所述胶层具有底壁和与所述底壁连接的周侧壁，所述平板玻璃的背面支撑与所述胶层的底壁，所述平板玻璃的四个侧面与所述周侧壁完全粘粘，从而定位所述平板玻璃。优选的，所述胶层是将抗酸胶涂布在所述基座的支撑面上固化而成的，所述抗酸胶为uv胶或热固胶；所述胶层的作用是用来支撑固定所述平板玻璃。可选的，所述基座可以是由塑料、玻璃等非金属材料制成，具有至少一个平整的表面作为所述支撑面。另外，所述基座的全部表面均涂覆有所述抗酸油墨，以保证后续步骤中，所述基座不被腐蚀。
步骤S3，对所述平板玻璃的正面进行蚀刻减薄处理以得到厚度小于等于150um的超薄玻璃母片（参见图5）；玻璃蚀刻减薄工艺为比较成熟的技术，故此处不做赘述。优选的，所述步骤S3包括步骤S31和步骤S32，其中，所述步骤S31是利用所述蚀刻液对所述平板玻璃进行蚀刻减薄处理一定时间；所述步骤S32是利用蚀刻能力相比所述蚀刻液更低的化学切割液对所述平板玻璃进行蚀刻减薄处理一定时间；所述步骤S31在所述步骤S32之前或之后实施，所述步骤S31和所述步骤S32实施一次或重复实施多次。其中，所述化学切割液是含氟离子的酸性水溶液。在使用所述蚀刻液对所述平板玻璃进行蚀刻减薄的过程中，所述平板玻璃的边缘会有所述蚀刻液与所述平板玻璃反应所产生的生成物，将所述平板玻璃放入到蚀刻能力低的化学切割液或单纯的水溶液中，可以很好的溶解、去除所述生成物，如此多次反复，可以获得更好的蚀刻切割效果。
步骤S4，在所述超薄玻璃母片的正面喷涂对应于切割图案的抗酸油墨（参见图6）；同样的，抗酸油墨可以借助丝网印刷法、叠层薄膜加工法或抗蚀剂涂敷光刻法施加在所述平板玻璃的正面。所述切割图案视产品要求而定，例如，可以是一个四角倒角的长方形（参见图1），或是四角倒角的正方形（参见图2），亦或是四角倒角的且临近一短边处留有圆形孔的长方形（参见图3）。
步骤S5，将所述超薄玻璃母片浸没在蚀刻液中处理一定时间后得到形状与所述切割图案一致的超薄玻璃盖板（参见图7）；优选的，所述蚀刻液为包含氟离子的酸性水溶液，所述蚀刻液中还包含硫酸根或硝酸根中的至少一种。例如，所述蚀刻液按质量百分比计组成为：氢氟酸3-7%，盐酸8-15%，碱金属硝酸盐（或碱金属硫酸盐）8-10%，余量为水。优选的，所述超薄玻璃母片在所述蚀刻液中的切割条件为：温度20-60℃，时间30-50min。需要说明的是，所述胶层与所述平板玻璃之间具有一定的粘附力，以保证所述超薄玻璃母片被蚀刻成多个相互独立隔开的超薄玻璃盖板后，所述超薄玻璃盖板可以比较稳定的附着在所述胶层上，而不随所述蚀刻液的流动而移动。
步骤S6，将所述胶层与所述超薄玻璃盖板一起取出所述蚀刻液后分离所述胶层和所述超薄玻璃盖板（参见图8）；在这一步骤中，利用吸盘吸住所述胶层连带着所述超薄玻璃盖板从所述蚀刻液中取出。
步骤S7，祛除所述超薄玻璃盖板的正面和背面上的抗酸油墨；具体的，所述抗酸油墨在特定的退墨剂的作用下可以迅速的退掉，退墨过程中可利用吸盘或机械手抓取所述超薄玻璃盖板浸泡在退墨剂中。另外，还可以将所述超薄玻璃盖板放在密闭的容器中高温碳化、粉化所述抗酸油墨，从而祛除所述抗酸油墨。
步骤S8，将祛除所述抗酸油墨后的所述超薄玻璃盖板在60-150℃温度下烘干。
通过以上步骤可以得到本发明提供的超薄玻璃盖板，其边缘不会有裂纹和破损，从而具有更好的强度，并且可以通过化学强化获得更高的强度，最终应用在OLED柔性屏幕上。
以上步骤中所用到的蚀刻液、化学切割液、抗酸油墨、退墨剂均为市售产品。
另外，可选的，所述步骤S1中的所述平板玻璃的背面具有与所述切割图案对应的预留缝，所述预留缝的深度至少为2um。所述预留缝可以在所述步骤S1前实施步骤S01或步骤S02来形成。其中，所述步骤S01是采用激光切割的方法在所述平板玻璃的背面形成预留缝；所述步骤S02是先在所述平板玻璃的背面布设对应于所述切割图案的抗酸油墨，后使用所述蚀刻液对所述平板玻璃的背面进行处理一定时间后得到所述预留缝。在所述平板玻璃的背面形成预留缝的目的是，为了在所述步骤S5中对所述超薄玻璃母片进行正面蚀刻时，蚀刻液对所述超薄玻璃母片由上之下切割下来的过程中，在即将蚀穿所述超薄玻璃母片并与所述预留缝对齐时，所述超薄玻璃母片更加容易被蚀穿，从而更容易获得相应外形的超薄玻璃盖板。
再有，可选的，在所述步骤S6与所述步骤S7之间实施步骤SA：将由所述步骤S6中得到的多个所述超薄玻璃盖板进行叠片后，用所述蚀刻液对多个所述超薄玻璃盖的侧边进行抛光。如此，进一步确保所述超薄玻璃盖板的边缘光滑平整。
需要补充说明的是，在所述步骤S2中，还可以采用抗酸的间隔物来替代所述胶层，所述间隔物可以是纸片或是塑料片或是其他抗酸材料制成的片状物，所述间隔物与所述平板玻璃和所述基座均不粘连，方便后续的分离作业。
本发明提供的超薄强化玻璃盖板的制备方法，包括如下步骤：
按照步骤S1-步骤S7制备超薄玻璃盖板，然后，将所述超薄玻璃盖板置于化学强化盐浴中进行离子交换，得到所述超薄强化玻璃盖板。优选的，所述超薄强化玻璃盖板的正面或背面具有深度小于自身厚度的20%的压应力层。
通过以上步骤制备得到的所述超薄强化玻璃盖板的可耐折弯能力大幅度提高，对折半径小于5mm的情况下，180°对折次数可达20万次以上。
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例1
步骤S1，准备具有相对的正面和背面的厚度为0.45mm的平板玻璃，所述平板玻璃的材质是高铝钠玻璃，首先对所述平板玻璃的背面进行抛光，打磨，直至背面为光滑平整面，然后采用丝网印刷法在所述平板玻璃的整个背面印刷所述抗酸油墨；
步骤S2，将背面布设有抗酸油墨的平板玻璃固定在全部表面均涂覆有所述抗酸油墨的玻璃材质的基座上，所述基座的上表面为用于承接所述平板玻璃的支撑面，将抗酸胶涂布在所述基座的支撑面上以形成胶层，所述平板玻璃的背面支撑于所述胶层，所述平板玻璃的侧面完全与所述胶层胶合；
步骤S3，对所述平板玻璃的正面进行蚀刻减薄处理以得到厚度为100um的超薄玻璃母片；
步骤S4，在所述超薄玻璃母片的正面布设对应于切割图案的抗酸油墨，所述切割图案为如图1所示的四角倒角的长方形；
步骤S5，将所述超薄玻璃母片浸没在蚀刻液中处理一定时间后得到形状与所述切割图案一致的超薄玻璃盖板；所述超薄玻璃母片在所述蚀刻液中的切割条件为：温度60℃，时间50min；
步骤S6，将所述胶层与所述超薄玻璃盖板一起取出所述蚀刻液后分离所述胶层和所述超薄玻璃盖板；
步骤S7，利用吸盘或机械手抓取所述超薄玻璃盖板浸泡在退墨剂中，祛除所述超薄玻璃盖板的正面和背面上的抗酸油墨；
步骤S8，将祛除所述抗酸油墨后的所述超薄玻璃盖板在150℃温度下烘干。
将所述超薄玻璃盖板置于化学强化盐浴中进行离子交换，得到所述超薄强化玻璃盖板，化学强化盐浴为纯硝酸钾盐浴，离子交换温度为400℃，离子交换时间为100min。
如此，得到的所述超薄强化玻璃盖板的正面和背面具有深度约为20um的压应力层。
经试验，对折半径小于5mm的情况下，其180°对折次数可达25万次以上。
实施例2
步骤S1，准备具有相对的正面和背面的厚度为0.3mm的平板玻璃，所述平板玻璃的材质是高铝钠玻璃，首先对所述平板玻璃的背面进行抛光，打磨，直至背面为光滑平整面，然后采用丝网印刷法在所述平板玻璃的整个背面印刷所述抗酸油墨；
步骤S2，将背面布设有抗酸油墨的平板玻璃固定在全部表面均涂覆有所述抗酸油墨的玻璃材质的基座上，所述基座的上表面为用于承接所述平板玻璃的支撑面，将抗酸胶涂布在所述基座的支撑面上以形成胶层，所述平板玻璃的背面支撑于所述胶层，所述平板玻璃的侧面完全与所述胶层胶合；
步骤S3，对所述平板玻璃的正面进行蚀刻减薄处理以得到厚度为75um的超薄玻璃母片；
步骤S4，在所述超薄玻璃母片的正面布设对应于切割图案的抗酸油墨，所述切割图案为如图2所示的四角倒角的正方形；
步骤S5，将所述超薄玻璃母片浸没在蚀刻液中处理一定时间后得到形状与所述切割图案一致的超薄玻璃盖板；所述超薄玻璃母片在所述蚀刻液中的切割条件为：温度40℃，时间40min；
步骤S6，将所述胶层与所述超薄玻璃盖板一起取出所述蚀刻液后分离所述胶层和所述超薄玻璃盖板；
步骤S7，利用吸盘或机械手抓取所述超薄玻璃盖板浸泡在退墨剂中，祛除所述超薄玻璃盖板的正面和背面上的抗酸油墨；
步骤S8，将祛除所述抗酸油墨后的所述超薄玻璃盖板在110℃温度下烘干。
将所述超薄玻璃盖板置于化学强化盐浴中进行离子交换，得到所述超薄强化玻璃盖板，化学强化盐浴为硝酸钾和硝酸钠的混合盐浴，比例为90:10，离子交换温度为380℃，离子交换时间为60min。
如此，得到的所述超薄强化玻璃盖板的正面和背面具有深度约为14.8um的压应力层。
经试验，对折半径小于5mm的情况下，其180°对折次数可达23万次以上。
实施例3
步骤S1，准备具有相对的正面和背面的厚度为0.25mm的平板玻璃，玻璃的材质是高铝锂钠玻璃，首先对所述平板玻璃的背面进行抛光，打磨，直至背面为光滑平整面，然后采用丝网印刷法在所述平板玻璃的整个背面印刷所述抗酸油墨；
步骤S2，将背面布设有抗酸油墨的平板玻璃固定在全部表面均涂覆有所述抗酸油墨的玻璃材质的基座上，所述基座的上表面为用于承接所述平板玻璃的支撑面，将抗酸胶涂布在所述基座的支撑面上以形成胶层，所述平板玻璃的背面支撑于所述胶层，所述平板玻璃的侧面完全与所述胶层胶合；
步骤S3，对所述平板玻璃的正面进行蚀刻减薄处理以得到厚度为50um的超薄玻璃母片；
步骤S4，在所述超薄玻璃母片的正面布设对应于切割图案的抗酸油墨，所述切割图案为如图3所示的四角倒角的且临近一短边处留有圆形孔的长方形；
步骤S5，将所述超薄玻璃母片浸没在蚀刻液中处理一定时间后得到形状与所述切割图案一致的超薄玻璃盖板；所述超薄玻璃母片在所述蚀刻液中的切割条件为：温度20℃，时间30min；
步骤S6，将所述胶层与所述超薄玻璃盖板一起取出所述蚀刻液后分离所述胶层和所述超薄玻璃盖板；
步骤S7，利用吸盘或机械手抓取所述超薄玻璃盖板浸泡在退墨剂中，祛除所述超薄玻璃盖板的正面和背面上的抗酸油墨；
步骤S8，将祛除所述抗酸油墨后的所述超薄玻璃盖板在60℃温度下烘干。
将所述超薄玻璃盖板置于化学强化盐浴中进行离子交换，得到所述超薄强化玻璃盖板，化学强化盐浴为硝酸钾和硝酸钠的混合盐浴，比例为70:30，离子交换温度为370℃，离子交换时间为15min。
如此，得到的所述超薄强化玻璃盖板的正面和背面具有深度约为9.8um的压应力层。
经试验，对折半径小于5mm的情况下，其180°对折次数可达20万次以上。
实施例4
其与实施例1的区别在于：
在步骤S1中，准备具有相对的正面和背面的厚度为0.45mm的平板玻璃，所述平板玻璃的材质是高铝钠玻璃，首先对所述平板玻璃的背面进行抛光，打磨，直至背面为光滑平整面，然后采用激光切割的方法在所述平板玻璃的背面形成深度为2um的轮廓与所述切割图案对应的预留缝，之后再采用丝网印刷法在所述平板玻璃的整个背面印刷所述抗酸油墨。
在所述步骤S2中，采用纸片替代所述胶层。
实施例5
其与实施例1的区别在于：
在步骤S1中，准备具有相对的正面和背面的厚度为0.45mm的平板玻璃，首先对所述平板玻璃的背面进行抛光，打磨，直至背面为光滑平整面，然后在所述平板玻璃的背面布设对应于所述切割图案的抗酸油墨，后使用所述蚀刻液对所述平板玻璃的背面进行处理一定时间后得到深度为2um的轮廓与所述切割图案对应的预留缝，之后再采用丝网印刷法在所述平板玻璃的整个背面印刷所述抗酸油墨。
在所述步骤S2中，采用塑料片替代所述胶层。
实施例6
其与实施例1的区别在于：
在所述步骤S6与所述步骤S7之间实施步骤SA：将由所述步骤S6中得到的多个所述超薄玻璃盖板进行叠片后，用所述蚀刻液对多个所述超薄玻璃盖的侧边进行抛光。如此，进一步确保所述超薄玻璃盖板的边缘光滑平整。
实施例上面结合附图对本发明的实施例进行了描述，但是本发明并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本发明的启示下，在不脱离本发明宗旨和权利要求所保护的范围情况下，还可做出很多形式，这些均属于本发明的保护范围之内。

Claims (11)

  1. 一种超薄玻璃盖板的制备方法，其特征在于，利用蚀刻液将正面喷涂有对应于切割图案的抗酸油墨、背面布设有抗酸油墨的厚度小于等于150um的超薄玻璃母片蚀刻成形状与所述切割图案一致的超薄玻璃盖板。
  2. 根据权利要求1所述的超薄玻璃盖板的制备方法，其特征在于，包括如下步骤：
    步骤S1，准备具有相对的正面和背面的平板玻璃，在所述平板玻璃的背面布设抗酸油墨；
    步骤S2，将背面布设有抗酸油墨的平板玻璃固定在基座上，所述基座具有一个用于承接所述平板玻璃的支撑面，所述支撑面上设有抗酸的胶层或间隔物，所述平板玻璃的背面支撑于所述胶层或所述间隔物，所述平板玻璃的侧面完全与所述胶层或所述间隔物胶合；
    步骤S3，对所述平板玻璃的正面进行蚀刻减薄处理以得到厚度小于等于150um的超薄玻璃母片；
    步骤S4，在所述超薄玻璃母片的正面布设对应于切割图案的抗酸油墨；
    步骤S5，将所述超薄玻璃母片浸没在蚀刻液中处理一定时间后得到形状与所述切割图案一致的超薄玻璃盖板；
    步骤S6，将所述胶层与所述超薄玻璃盖板一起取出所述蚀刻液后分离所述胶层和所述超薄玻璃盖板；
    步骤S7，祛除所述超薄玻璃盖板的正面和背面上的抗酸油墨。
  3. 根据权利要求2所述的超薄玻璃盖板的制备方法，其特征在于，在所述步骤S6与所述步骤S7之间实施步骤SA：将由所述步骤S6中得到的多个所述的超薄玻璃盖板进行叠片后，用所述蚀刻液对多个所述超薄玻璃盖的侧边进行抛光。
  4. 根据权利要求2所述的超薄玻璃盖板的制备方法，其特征在于，所述步骤S3包括步骤S31和步骤S32，其中，
    所述步骤S31是利用所述蚀刻液对所述平板玻璃进行蚀刻减薄处理一定时间；
    所述步骤S32是利用蚀刻能力相比所述蚀刻液更低的化学切割液对所述平板玻璃进行蚀刻减薄处理一定时间；
    所述步骤S31在所述步骤S32之前或之后实施，所述步骤S31和所述步骤S32实施一次或重复实施多次。
  5. 根据权利要求2所述的超薄玻璃盖板的制备方法，其特征在于，所述步骤S1中的所述平板玻璃的背面具有与所述切割图案对应的预留缝，所述预留缝的深度至少为2um。
  6. 根据权利要求5所述的超薄玻璃盖板的制备方法，其特征在于，还包括步骤S01或步骤S02，其中，
    所述步骤S01是采用激光切割的方法在所述平板玻璃的背面形成所述预留缝；
    所述步骤S02是先在所述平板玻璃的背面布设对应于所述切割图案的抗酸油墨，后使用所述蚀刻液对所述平板玻璃的背面进行处理一定时间后得到所述预留缝；
    所述步骤S01或所述步骤S02在所述步骤S1之前实施。
  7. 根据权利要求2所述的超薄玻璃盖板的制备方法，其特征在于，所述步骤S1所描述的平板玻璃背面为光面。
  8. 根据权利要求2所述的超薄玻璃盖板的制备方法，其特征在于，所述平板玻璃的厚度为0.3±0.15mm。
  9. 一种超薄玻璃盖板，其特征在于，按照如权利要求1-8中任意一项所述的制备方法制备获得。
  10. 一种超薄强化玻璃盖板的制备方法，其特征在于，包括如下步骤：
    按照如权利要求1-8所述的制备方法制备超薄玻璃盖板；
    将所述超薄玻璃盖板置于化学强化盐浴中进行离子交换，得到所述超薄强化玻璃盖板。
  11. 一种超薄强化玻璃盖板，其特征在于，按照如权利要求10所述的制备方法制备获得，所述超薄强化玻璃盖板的正面或背面具有深度小于自身厚度的20%的压应力层。
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