CN112919824A - Ultrathin flexible cover plate and preparation method thereof - Google Patents
Ultrathin flexible cover plate and preparation method thereof Download PDFInfo
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- CN112919824A CN112919824A CN202110312641.0A CN202110312641A CN112919824A CN 112919824 A CN112919824 A CN 112919824A CN 202110312641 A CN202110312641 A CN 202110312641A CN 112919824 A CN112919824 A CN 112919824A
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- 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
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
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- 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
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
- C03C17/322—Polyurethanes or polyisocyanates
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- 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
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
- C03C17/326—Epoxy resins
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- 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
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
- C03C2218/116—Deposition methods from solutions or suspensions by spin-coating, centrifugation
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- Surface Treatment Of Glass (AREA)
Abstract
UTG is fixed by bottom plate glass and UV anti-adhesive double-sided adhesive tape, UTG is coated with a high polymer organic material, a high polymer organic film layer in the double-sided adhesive tape area is removed, and a hot air edge raising method is matched, so that the ultrathin flexible cover plate is easily peeled, the problem of easy peeling and frangibility is solved, the problems of easy peeling and frangibility or generation of dark cracks of the ultrathin flexible cover plate are solved, the manufacturing loss of UTG is reduced, the effect of reducing the cost is achieved, and a brand new thought is provided for peeling the ultrathin flexible cover plate. Compared with the prior art, the invention has the advantages of simple operation, high production efficiency, applicability to ultrathin flexibility, no size and thickness requirements and high compatibility.
Description
Technical Field
The invention belongs to the field of ultrathin flexible cover plate preparation, and particularly relates to an ultrathin flexible cover plate and a preparation method thereof.
Background
The ultra-thin flexible glass (UTG) is a glass having flexibility with a glass thickness of 100 μm or less, and is most prominently characterized by bendability, and a display device can be bent or folded by using the bendability, thereby providing convenience to people to carry or use. Even in this case, the glass itself is easily crushed and sputtered due to its brittleness, strength, and the like, and is harmful to the human body, so that UTG alone cannot be used alone as the outermost layer of the display device. At present, the folding display cover plate on the market is basically made of flexible plastics, and although the folding display cover plate can meet the folding requirement, due to the limitation of mechanical property, the surface of the flexible plastic cover plate is easy to scratch and break. In addition, a flexible cover plate is prepared by laminating UTG transparent polyimide (CPI), but the flexible cover plate has a folding line in a bending area after being used repeatedly, and a screen is easy to have defects such as corrugation, and the like, thereby affecting the application of a display device.
In order to improve the current situation, the ultrathin flexible cover plate can be prepared by coating a high molecular organic material on the surface of UTG, spin coating, blade coating and spray coating are generally adopted for processing, but since UTG is thin and fragile in property, the peeling of the prepared ultrathin flexible cover plate becomes a big problem at present, the Film is cut into a shape matched with UTG in size in the prior art, a non-UTG area is covered and coated, the peeling difficulty of the ultrathin flexible cover plate is reduced by reducing the overflow amount of the high molecular organic material after coating, however, since the Film is closely connected with the edge of UTG, when the Film is peeled off, the edge of UTG has the bad phenomena of turning up, falling off or sawtooth and the like.
Disclosure of Invention
The invention aims to provide a preparation method of an ultrathin flexible cover plate, wherein UTG is fixed by adopting bottom plate glass and UV (ultraviolet) anti-adhesive double-sided adhesive, after UTG is coated with a high-molecular organic material, a high-molecular organic film layer in a double-sided adhesive area is removed, and a hot air edge raising method is matched, so that the ultrathin flexible cover plate is easily peeled, the problem of easy breakage in peeling is solved, and a brand new thought is provided for peeling of the ultrathin flexible cover plate.
The invention also aims to provide the ultrathin flexible cover plate prepared by the method.
The specific technical scheme of the invention is as follows:
a preparation method of an ultrathin flexible cover plate comprises the following steps:
1) fixing one surface of the ultrathin flexible glass on the bottom plate glass by adopting UV (ultraviolet) viscosity-reducing double-sided adhesive tape, coating a macromolecular organic material on the other surface, curing after curing;
2) removing the high molecular organic materials except the ultrathin flexible glass;
3) and peeling off the edges to obtain the ultrathin flexible cover plate.
Further, in step 1), in order to ensure that the high molecular organic material cannot seep into the back side of UTG, when the bottom plate glass, the UV adhesion-reducing double-sided adhesive tape and UTG are bonded, the size of the UV adhesion-reducing double-sided adhesive tape is cut to be larger than UTG; preferably, the backplane glass is larger in size than the ultra-thin flexible glass;
further, the high molecular organic material is coated on the surface of UTG by adopting a spin coating, spray coating or blade coating mode, and the thickness of the cured and cured high molecular organic material layer is 5-200 μm; after coating, the whole surface is coated, and UTG is thin, so the polymer organic material inevitably adheres to the UV-adhesive double-sided tape area, and the polymer organic material layer in the UV-adhesive double-sided tape area and the polymer organic material layer on UTG are integrated, if the film is directly torn off, the bad phenomena such as turning up, dropping off or sawtooth of the polymer layer at the UTG edge can occur.
The polymer organic material layer in the UV-vis double-sided adhesive region is referred to as the non-UTG region polymer organic material layer, and the polymer organic material layer on the surface of the ultra-thin flexible glass is referred to as the UTG region polymer organic material layer.
The high molecular organic material in the step 1) comprises but is not limited to polyurethane resin, epoxy resin or polymethyl methacrylate (PMMA);
the curing in the step 1) refers to curing for 30-60min at 40-80 ℃;
the curing in the step 1) refers to curing at the temperature of 110-;
further, in step 1), at least one layer of polymer organic material is coated on the surface of UTG.
Further, in step 1), at least one high molecular organic material is coated on the surface of UTG.
The step 2) is specifically as follows: and removing the high molecular organic material layer in the UV adhesive double-sided tape area, namely removing the high molecular organic material layer in the non-UTG area.
The removing method in the step 2) comprises the following steps: covering the surface of the ultrathin flexible glass by using a baffle, spraying and cleaning by using pure water after spraying the mixed solution, removing the baffle and drying.
The mixed solution is a mixed solution of pure water and an organic solvent, or a mixed solution of pure water, an organic solvent and an acid.
Because part of the high molecular organic materials have special properties and have better dissolving effect under the acidic condition, organic acid or inorganic acid with different volume ratios can be added into the mixed solution.
The temperature of the mixed solution is 40-50 ℃.
The organic solvent includes but is not limited to one or more of ethanol, acetone, methanol, glycerol, propylene glycol, toluene, xylene, dimethylacetamide (DMAc), dimethyl sulfoxide, dichloromethane or ether alcohol. The main action principle of removing the macromolecular organic materials except the ultrathin flexible glass by spraying the mixed solution is that the mixed solution and the macromolecular organic materials can be dissolved through similar compatibility.
When the organic polymer material is polyurethane resin, preferably, the mixed solution is formed by mixing pure water, ethanol, glycerol, propylene glycol and dimethylacetamide (DMAc) according to a volume ratio of 4:2:1:1: 2.
When the organic polymer material is epoxy resin, preferably, the mixed solution is prepared by mixing pure water, dichloromethane, formic acid, phenol and sulfuric acid according to the volume ratio of 3:2:2:2: 1.
When the organic polymer material is PMMA, preferably, the mixed solution is pure water, acetone, methanol and glycerol in a volume ratio of 4:2: 3: 1.
The mixed solution can dissolve the high molecular organic material film, the spraying mode is fan-shaped spraying, and the spraying rate is controlled to be 1-1.5cm3S, root of time of sprayingThe spraying time is determined according to the thickness of the high molecular organic material film, and the high molecular organic material film is dissolved. The spraying time is generally controlled to be 1-2 h.
Preferably, the pure water spray adopts the same fan-shaped spray mode;
the pure water temperature is controlled at 40-50 deg.C, and the flow rate is 2.0-3.0cm3And/s, the cleaning time is 30-40 min.
After the mixed solution or pure water is sprayed, the liquid can be recycled after falling into the tank.
Because part of sprayed solvent is volatile, preferably, the spraying system is in a closed and recyclable state, so that the production cost can be reduced, and the utilization rate of the solution and pure water can be improved; and simultaneously controlling the temperature of the spraying system to be kept at 40-50 ℃ all the time.
Furthermore, the temperature in the tank can be regulated at any time, and the main function of the device is to ensure that the spraying system is in a constant temperature state, so that the incomplete reaction between the spraying solution and the high-molecular organic material caused by temperature difference is avoided, and the spraying effect is further influenced.
Preferably, the side face of the baffle is provided with a slope, the slope inclination is controlled to be 30-60 degrees, so that the retention amount of the spraying solution on the baffle or the side face of the baffle in the treatment process is reduced as much as possible, the spraying solution is prevented from seeping into the UTG area, the residual amount of the high molecular organic material coating at the edge of the ultrathin flexible cover plate is ensured to be less than 0.2mm, and the subsequent processing of the ultrathin flexible cover plate is not influenced.
Preferably, the dimension of each side of the surface of the baffle plate, which is in contact with the polymer organic material coating, is 0.2 to 0.3mm longer than the dimension of each side of the baffle plate UTG.
Furthermore, the baffle is of a three-layer structure, the uppermost layer is made of resin materials, the middle layer is made of rubber materials, and the lower layer is made of a protective film; the resin material is acid-resistant and alkali-resistant;
or the baffle has a two-layer structure, wherein the upper layer is made of resin materials, and the lower layer is a protective film with one sticky surface; the protective film is adhered and fixed with the resin material by the self-adhesion of the protective film.
The thickness of the baffle is not limited;
the resin material comprises but is not limited to PP, PPR, PPH, PVDF or PTFE, the main property of the resin material is acid resistance and alkali resistance, the phenomenon that a baffle is corroded by a solvent in the long-time use process is avoided, the shielding effect is influenced, and meanwhile, the resin material plays a supporting and fixing role in the sticking clothes of a glue material and a protective film;
the protective film or the protective film with one side having viscosity comprises but not limited to PE, PP, PET or PC, and is mainly used for protecting the surface film layer of the ultrathin flexible cover plate and preventing the surface film layer of the cover plate from being scratched, stained or indented by abrasion, burrs or stains generated by long-term use of resin materials.
The protective film is connected with the resin material through a glue material, wherein the glue material comprises but is not limited to RPET, DPET, PET or PVC, and the glue material is mainly used for fixing the resin material and the protective film. If the protective film is not fixed by using the adhesive material, the protective film may have collapse, wrinkles or bubbles and other defects in the process of attaching the protective film, so that the protective film cannot well protect the surface film layer of the cover plate.
The main principle of the removal in the step 2) is to remove the high molecular organic material in the double-sided adhesive tape area by utilizing the characteristic that the high molecular organic material layer is similar to and compatible with the sprayed mixed solution, the main processing mode is spraying, washing and dissolving, then the baffle is not removed, the residual sprayed solution and the high molecular organic material are cleaned by pure water, and then the baffle is removed.
The drying in the step 2) refers to that the system is put into a drying oven with the temperature of 40-45 ℃ for drying for 25-35 min.
The step 3) is specifically as follows: and (3) tearing off the UV viscosity reducing glue from the bottom plate glass on one side by utilizing ultraviolet illumination, and then peeling off the edge of the ultrathin flexible cover plate on the other side of the UV viscosity reducing glue by utilizing hot air to obtain the ultrathin flexible cover plate.
Preferably, the tearing of the UV-reduced adhesive from the bottom plate glass on one side by utilizing ultraviolet illumination is specifically as follows: irradiating with 365nm ultraviolet light at a wavelength of at least 500MJ/cm for 5 s2And (4) reducing the viscosity of the UV viscosity reduction double-sided adhesive tape, and removing the bottom plate glass.
Preferably, the edge peeling of the ultra-thin flexible glass on the other side of the UV visbreaker by using hot air is specifically as follows: and blowing the UV viscosity-reducing double-sided adhesive by using hot air at 33-38 ℃, softening the UV viscosity-reducing adhesive adhered to the ultrathin flexible cover plate by using hot air at a proper temperature, and peeling the ultrathin flexible cover plate from the adhesive material by using wind power in a manual or mechanical film tearing mode to obtain a finished ultrathin flexible cover plate. After UV irradiation, the viscosity of the UV viscosity-reducing double-sided adhesive is reduced, and the ultrathin glass is easy to peel, but due to the fact that the ultrathin glass is thin in thickness, hot air is further adopted to cooperate with edge peeling, the ultrathin glass can be peeled more easily, damage to the ultrathin glass is reduced, and the yield is improved.
The preparation method provided by the invention has no limit to the size and thickness of UTG, and can ensure the yield of the ultrathin flexible cover plate.
The ultrathin flexible cover plate provided by the invention is prepared by adopting the method.
The invention adopts UV anti-sticking double faced adhesive tape to fix UTG on the bottom plate glass, so that the coating is more uniform, and the loss of UTG coating pair is reduced. After coating, a sample is firstly sprayed by a mixed solution to dissolve the high molecular organic material in the UV viscosity-reducing double-sided adhesive area, then the high molecular organic material after dissolution is sprayed by pure water to be cleaned, in order to ensure that the dissolution and cleaning effects of the high molecular organic material are better, the temperature of the spraying solution and the pure water in a spraying system are set to be 40-50 ℃, the temperature in a tank can be regulated and controlled at any time, in view of the fact that part of the solvent sprayed is volatile, the spraying system is in a closed and recyclable state, and the utilization rate of the mixed solution and the pure water is mainly improved in order to reduce the production cost.
The invention utilizes the characteristic of similarity and intermiscibility between high-molecular organic materials and spraying solution to remove the high-molecular organic film layer in the double-sided adhesive tape area, and is matched with a hot air edge raising method, so that the ultrathin flexible cover plate is easier to peel, the problems of easy breakage or generation of dark cracks and the like of the ultrathin flexible cover plate can be well overcome, and the manufacturing loss of UTG is reduced, thereby achieving the effect of reducing the cost and providing a brand new idea for peeling the ultrathin flexible cover plate.
The ultrathin flexible cover plate only comprises UTG coated with a high molecular organic material. UTG is fixed by using the baseplate glass and the UV adhesive reducing double-sided adhesive tape in the coating process, in order to ensure that the high molecular organic material cannot seep into the back face of UTG, when the baseplate, the UV adhesive reducing double-sided adhesive tape and UTG are adhered, the size of the UV adhesive reducing double-sided adhesive tape is cut to be larger than that of UTG, after the UTG is coated with the high molecular organic material, the high molecular organic material is coated in a double-sided adhesive area inevitably due to the whole-face coating, and a high molecular layer in the double-sided adhesive area and a high molecular layer on UTG are integrated and cannot be directly torn off.
Compared with the prior art, the invention is covered by a baffle UTG before spraying, the baffle is mainly formed by combining a protective film and a resin material with strong acid and alkali resistance, the protective film is arranged below the protective film, the resin material is arranged above the protective film, and the protective film and the resin material are connected through a glue material, and the protective film is used for protecting a high polymer material film coated on the surface of UTG, thereby avoiding bad appearance such as dirt, indentation, scratch and the like. According to the preparation method of the ultrathin flexible cover plate, provided by the invention, the macromolecular organic materials in the double-sided adhesive tape area can be completely removed by a method of dissolving by spraying solution and cleaning by pure water, and then the ultrathin flexible cover plate is peeled by combining a hot air edge raising mode, so that the peeling damage rate of the ultrathin flexible cover plate is reduced to be within 10% from 50%, and the effect is obvious; the side face of the baffle is set to be a slope, and the spraying solution can be further prevented from permeating into an UTG area by matching with a fan-shaped spraying method, so that the coating overflow amount of the ultrathin flexible glass cover plate after being stripped is ensured to be less than 0.2 mm; the method is simple to operate, high in production efficiency, applicable to ultrathin flexibility, free of size and thickness requirements and high in compatibility.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
Example 1
A preparation method of an ultrathin flexible cover plate comprises the following steps:
1) coating a high molecular organic material on the ultrathin flexible glass: the size of the ultrathin flexible glass UTG is 40mm multiplied by 80mm, one surface of the ultrathin flexible glass UTG is fixed on the bottom plate glass by adopting UV (ultraviolet) adhesive reducing double-sided adhesive, and the size of each side of the UV adhesive reducing double-sided adhesive is larger than that of each side of UTG; the size of each side of the bottom plate glass is larger than that of each side of the ultrathin flexible glass; coating the other surface of UTG with polyurethane resin by spin coating, curing at 60 deg.C for 30min, and curing at 110 deg.C for 30 min; the thickness of the polyurethane resin layer on the UTG surface is 50 μm, after coating, the whole surface is coated, and UTG is thin, so the polyurethane resin layer inevitably adheres to the UV visbreaking double-sided adhesive tape area, the polyurethane resin layer is a non-UTG area in the UV visbreaking double-sided adhesive tape area, and is a UTG area on the ultrathin flexible glass surface;
2) after the product is treated in the step 1), a polyurethane resin layer in an UTG area is shielded by a baffle, the size of the surface of the baffle, which is in contact with the polyurethane resin layer, is 40.2mm multiplied by 80.2mm, the side surface of the baffle is a slope, the inclination is 30 degrees, the baffle is of a 3-layer structure, the uppermost layer of PP resin material, the middle layer of glue material PVC and the lower layer of PE protective film are used, then, a mixed solution of pure water, ethanol, glycerol, propylene glycol and dimethylacetamide DMAc in a volume ratio of 4:2:1:1:2 is used as a spraying solution, the polyurethane resin layer in a double-sided glue area (non-UTG area) is dissolved, residual glue is washed clean by spraying with the pure water in a fan-shaped spraying mode, and the spraying rate of the mixed solution is controlled to be 1.5cm3(s) spraying time of 1.5h to gather in a region other than UTGAfter dissolving the urethane, spraying with pure water at a rate of 2.0cm3(s) spraying for 30 min; the temperature of the sprayed mixed solution and the pure water is controlled to be 45 ℃, the spraying system is in a closed and recyclable state, the temperature of the spraying system is controlled to be always kept at 45 ℃, after spraying, the liquid falls into the tank and can be recycled, the production cost can be reduced, the utilization rate of the mixed solution and the pure water is improved, after spraying, the baffle is removed, and the mixed solution and the pure water are dried in an oven at 40 ℃ for 30 min;
3) removing the residual edge (polyurethane resin layer in the region other than UTG) in step 2), and irradiating with UV at wavelength of 365nm at 500MJ/cm2The ultraviolet light irradiates for 5 seconds to make the UV viscosity reduction double-sided adhesive reduce the viscosity, the bottom plate glass is removed, then the hot air is adopted to assist the edge rising, the hot air with the temperature of 35 ℃ is utilized to soften the UV viscosity reduction adhesive adhered with the ultrathin flexible cover plate, and meanwhile, the ultrathin flexible cover plate is peeled off from the adhesive material in a manual or mechanical film tearing mode by means of wind power, so that the finished ultrathin flexible cover plate is obtained.
Example 2
A preparation method of an ultrathin flexible cover plate comprises the following steps:
1) coating a high molecular organic material on the ultrathin flexible glass: the size of the ultrathin flexible glass UTG is 141.3mm multiplied by 136.2mm, one surface of the ultrathin flexible glass UTG is fixed on the bottom plate glass by adopting UV adhesive reducing double-sided adhesive, and the size of the UV adhesive reducing double-sided adhesive is larger than UTG; the size of the bottom plate glass is larger than that of the ultrathin flexible glass; coating the other surface of UTG with epoxy resin by spin coating, curing at 60 deg.C for 60min in a baking oven, and curing at 110 deg.C for 30 min; the thickness of the epoxy resin layer on the surface of UTG is 30 μm; after coating, the whole surface is coated, and UTG is thin, so the epoxy resin layer inevitably adheres to the UV adhesive double-sided tape area, the epoxy resin layer is a non-UTG area in the UV adhesive double-sided tape area, and a UTG area on the surface of the ultrathin flexible glass.
2) In the product treated in the step 1), the epoxy resin layer in the UTG area is shielded by a baffle, the size of the surface of the baffle contacting with the epoxy resin layer is 141.5mm multiplied by 136.4mm, the side surface of the baffle is a slope, the inclination is 45 degrees, the baffle is of a 3-layer structure,using a mixed solution of pure water, dichloromethane, formic acid, phenol and sulfuric acid in a volume ratio of 3:2:2:2:1 as a spraying solution to dissolve the epoxy resin layer in the double-sided adhesive tape area, and then spraying the pure water to clean residual adhesive, wherein the spraying rate of the mixed solution is controlled to be 1.3cm3Spraying for 2h to a region other than UTG for dissolving the epoxy resin, spraying with pure water at a speed of 2.5cm3And/s, the temperature of the mixed solution and pure water was controlled to 40 ℃. The spraying system is in a closed and recyclable state, the temperature of the spraying system is controlled to be always kept at 40 ℃, after spraying, the liquid falls into the tank and can be recycled, the production cost can be reduced, the utilization rate of the mixed solution and the pure water is improved, after spraying, the baffle is removed, and the mixed solution and the pure water are dried in an oven at 40 ℃ for 25 min;
3) removing the residual edge (the epoxy resin layer in the area other than UTG) in step 2), and irradiating with UV at wavelength of 365nm to obtain UV radiation of 600MJ/cm2The ultraviolet light irradiates for 5 seconds to ensure that the UV viscosity reduction double-sided adhesive tape is subjected to viscosity reduction, the bottom plate glass is removed, then hot air with the temperature of 35 ℃ is adopted to assist edge rising, the UV viscosity reduction adhesive tape adhered with the ultrathin flexible cover plate is softened, and meanwhile, the ultrathin flexible cover plate is peeled off from the adhesive material in a manual or mechanical film tearing mode by means of wind power, so that the finished ultrathin flexible cover plate is obtained.
Example 3
A preparation method of an ultrathin flexible cover plate comprises the following steps:
1) coating a high molecular organic material on the ultrathin flexible glass: the size of the ultra-thin flexible glass UTG is 70.5mm multiplied by 135.3mm, the ultra-thin flexible glass UTG is fixed on the bottom plate glass by adopting UV adhesive reducing double-sided adhesive, and the size of the UV adhesive reducing double-sided adhesive is larger than UTG; the size of the bottom plate glass is larger than that of the ultrathin flexible glass; coating the PMMA on the other surface of UTG by adopting a spin coating mode, then putting the PMMA in an oven, curing for 40min at 80 ℃, curing for 30min at 120 ℃, wherein the thickness of the PMMA layer on the surface of UTG is 60 mu m; after coating, the whole surface is coated, and UTG is thin, so the PMMA layer inevitably adheres to the UV visbreaking double-sided adhesive tape area, the PMMA layer is a non-UTG area in the UV visbreaking double-sided adhesive tape area, and a UTG area on the surface of the ultrathin flexible glass.
2) The PMMA layer in the UTG area of the product processed in the step 1) is shielded by a baffle, the size of the surface of the baffle contacting with the PMMA layer is 70.7mm multiplied by 135.5mm, the side surface of the baffle is a slope, the inclination is 35 degrees, the baffle comprises the PPR resin material on the uppermost layer and the PET acid-proof protective film with the viscosity on the lower layer, and then, pure water, acetone, methanol and glycerol are used according to the volume ratio of 4: taking the mixed solution of 2:3:1 as a spraying solution, dissolving PMMA in a double-sided adhesive tape area, washing residual adhesive tapes clean by using pure water, and controlling the spraying rate of the mixed solution to be 1.2cm3Spraying for 1h to a region other than UTG for PMMA dissolution, and spraying with pure water at a rate of 3.0cm3The temperature of the spraying solution and the pure water is controlled to be 50 ℃, the spraying system is in a closed and recyclable state, the temperature of the spraying system is controlled to be always kept at 50 ℃, after spraying, the liquid falls into the tank and can be recycled, the production cost can be reduced, the utilization rate of the mixed solution and the pure water is improved, after spraying, the baffle is removed, and drying is carried out in a 45 ℃ oven for 25 min;
3) removing the residual edge in the step 2), and irradiating with UV radiation of 500MJ/cm at 365nm2The ultraviolet light irradiates for 5 seconds to make the UV viscosity-reducing double-sided adhesive tape reduce the viscosity, the bottom plate glass is removed, then hot air with the temperature of 35 ℃ is adopted to assist the edge rising, the UV viscosity-reducing adhesive tape adhered with the ultrathin flexible cover plate is softened, and meanwhile, the ultrathin flexible cover plate is peeled off from the adhesive material in a manual or mechanical film tearing mode by means of wind power, so that the finished ultrathin flexible cover plate is obtained.
In order to verify the appearance and performance of the ultrathin flexible cover plate obtained in the embodiment of the invention, the ultrathin flexible cover plates obtained after the treatment of the embodiments 1 to 3 are detected, and the detection results are shown in table 1.
Table 1 results of testing the performance of ultra-thin flexible cover plates obtained after the treatments of examples 1 to 3
Remarking:
bending times are more than or equal to 20W, the adhesive force reaches 5B (the highest of the current judging grades is 5B), and the use requirement can be met;
the bending times are not the breaking times of the glass bending experiment but the times when the bending experiment is stopped after 20W times, and the glass is still not broken;
the bending performance test is carried out according to GB/T34171-2017 (three-point bending method of thin and ultrathin glass bending performance test method), and the adhesion test is carried out according to GB/T9286-1998 (grid drawing test of paint films of color paint and varnish);
the edge external expansion amount refers to the distance between the high molecular organic material and UTG external expansion on the finished product of the ultrathin flexible cover plate, and the use requirement can be met when the edge external expansion amount is less than or equal to 0.2mm through measuring by a 2.5D microscope;
fifthly, the yield includes the proportion of normal products after removing defects such as scratches, dirt, foreign matters, warping, peeling, breaking and the like.
Claims (10)
1. The preparation method of the ultrathin flexible cover plate is characterized by comprising the following steps of:
1) fixing one surface of the ultrathin flexible glass on the bottom plate glass by adopting UV (ultraviolet) viscosity-reducing double-sided adhesive tape, coating a macromolecular organic material on the other surface, curing after curing;
2) removing the high molecular organic materials except the ultrathin flexible glass;
3) and peeling off the edges to obtain the ultrathin flexible cover plate.
2. The method according to claim 1, wherein the curing in step 1) is performed at 40-80 ℃ for 30-60 min; the curing is performed at the temperature of 110 ℃ and 130 ℃ for 15-30 min.
3. The preparation method according to claim 1, wherein the step 2) is specifically: covering the surface of the ultrathin flexible glass by using a baffle, spraying and cleaning by using pure water after spraying the mixed solution, removing the baffle and drying.
4. The production method according to claim 1, wherein the mixed solution is a mixed solution of pure water and an organic solvent, or a mixed solution of pure water, an organic solvent, and an acid.
5. The method of claim 4, wherein the organic solvent includes but is not limited to one or more of ethanol, acetone, methanol, glycerol, propylene glycol, toluene, xylene, dimethylacetamide (DMAc), dimethyl sulfoxide, dichloromethane or ether alcohol.
6. The production method according to claim 3 or 4, wherein the baffle side is provided as a slope.
7. The manufacturing method according to claim 3 or 6, wherein each side dimension of the contact surface of the baffle and the ultra-thin glass is 0.2 to 0.3mm longer than each side dimension of the ultra-thin glass.
8. The production method according to claim 4 or 6, wherein the baffle has a three-layer structure of an uppermost resin material, an intermediate adhesive material, and a lower protective film;
or the baffle is of a two-layer structure, the upper layer of resin material and the lower layer of the baffle are respectively a protective film with one side provided with viscosity.
9. The preparation method according to claim 1, wherein the step 3) is specifically: and (3) tearing off the UV viscosity reducing glue from the bottom plate glass on one side by utilizing ultraviolet illumination, and then peeling off the edge of the ultrathin flexible cover plate on the other side of the UV viscosity reducing glue by utilizing hot air to obtain the ultrathin flexible cover plate.
10. An ultra-thin flexible cover sheet prepared by the preparation method of any one of claims 1 to 9.
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