CN112318796B - Flexible cover plate, preparation method thereof and flexible display device - Google Patents
Flexible cover plate, preparation method thereof and flexible display device Download PDFInfo
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- CN112318796B CN112318796B CN202011132633.XA CN202011132633A CN112318796B CN 112318796 B CN112318796 B CN 112318796B CN 202011132633 A CN202011132633 A CN 202011132633A CN 112318796 B CN112318796 B CN 112318796B
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- cover plate
- flexible cover
- flexible
- mixed solution
- glass fibers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/12—Spreading-out the material on a substrate, e.g. on the surface of a liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/42—Removing articles from moulds, cores or other substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3475—Displays, monitors, TV-sets, computer screens
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a flexible cover plate and a preparation method thereof, and a flexible display device, wherein the preparation method comprises the steps of firstly preparing a mixed solution containing aminopropyl siloxane, glass fibers and polyamide acid, then uniformly coating the mixed solution on a rigid substrate, then sequentially carrying out low-temperature pre-curing treatment and high-temperature curing treatment on the mixed solution, and finally separating the flexible cover plate from the rigid substrate through water boiling to remove a film, so as to obtain a polyimide flexible cover plate doped with glass fibers; the high mechanical strength of the glass fiber is utilized, so that the wear resistance of the flexible cover plate is improved, and the hardness of the flexible cover plate is improved; the high elastic modulus characteristic of the glass fiber is utilized, the deformation resistance of the flexible cover plate is improved, and the flexibility of the flexible cover plate is improved; the flexible cover plate meets the requirements of hardness and flexibility at the same time, the quality of the flexible display device is improved, and the service life of the flexible display device is prolonged.
Description
Technical Field
The application relates to the field of display, in particular to a flexible cover plate, a preparation method of the flexible cover plate and a flexible display device.
Background
The flexible display gradually realizes the terminal form of folding, bending and even curling by virtue of unique advantages of the flexible display in the aspects of display performance, lightness, thinness, flexibility and the like, meets the increasingly changing consumption requirements of users, and has developed into the core technology of the future display field.
The flexibility of the flexible cover plate, which is an important component of the flexible display device, becomes a decisive factor for influencing the flexible display device. In the prior art, two main types of flexible cover plates are provided, one type is a cover plate consisting of a transparent polyimide flexible substrate and a hardened layer, however, the hardened layer hardly considers high hardness and high flexibility, and polyimide is easy to deform after being repeatedly bent for many times, so that cracks are caused; the other is an ultra-thin glass cover plate, however, the flexibility and the folding performance of the glass are not good, and the glass cover plate as a flexible cover plate has the problem of being fragile.
Therefore, the problem that hardness and flexibility cannot be considered in the existing flexible cover plate needs to be solved.
Disclosure of Invention
The invention provides a flexible cover plate, a preparation method thereof and a flexible display device, aiming at solving the problem that the hardness and the flexibility of the existing flexible cover plate cannot be considered at the same time.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the invention provides a preparation method of a flexible cover plate, which comprises the following steps:
preparing a mixed solution including aminopropylsiloxane, glass fiber and polyamic acid;
uniformly coating the mixed solution on a rigid substrate;
carrying out low-temperature pre-curing treatment on the mixed solution to obtain an amidoacid-imide random copolymer film doped with aminopropyl siloxane and glass fibers;
carrying out high-temperature curing treatment on the amic acid-imide random copolymer film to obtain a polyimide flexible cover plate doped with glass fibers, wherein the glass fibers have a three-dimensional network structure;
and (3) separating the flexible cover plate from the rigid substrate by water boiling to remove the film.
In the preparation method provided by the present invention, the step of preparing the mixed solution including aminopropylsiloxane, glass fiber and polyamic acid includes:
preparing a polyamic acid solution;
uniformly dispersing aminopropyl siloxane and glass fibers into a polar aprotic solvent;
and adding the polyamic acid solution into the polar aprotic solvent, and uniformly mixing the polyamic acid solution, the aminopropyl siloxane and the glass fiber to form a mixed solution.
In the preparation method provided by the invention, the low-temperature pre-curing temperature is 120-200 ℃, and the gas environment of the low-temperature pre-curing is a vacuum environment.
In the preparation method provided by the invention, the high-temperature curing temperature is 350-450 ℃, and the gas environment of the high-temperature curing is a nitrogen environment.
In the preparation method provided by the invention, the temperature range of the water boiling demoulding is 70-100 ℃.
The invention provides a flexible cover plate which is prepared by any one of the preparation methods provided by the invention, and the flexible cover plate is a polyimide flexible cover plate doped with glass fibers.
In the flexible cover plate provided by the invention, the glass fiber has a three-dimensional net structure.
In the flexible cover plate provided by the invention, the doping concentration of the glass fiber ranges from 2% to 10%.
In the flexible cover plate provided by the invention, the thickness of the flexible cover plate ranges from 50 micrometers to 100 micrometers.
Meanwhile, the present invention also provides a flexible display device, comprising:
a display panel;
the flexible cover plate provided by the invention is prepared by any preparation method provided by the invention.
The invention provides a flexible cover plate and a preparation method thereof, and a flexible display device, wherein the preparation method comprises the steps of firstly preparing a mixed solution containing aminopropyl siloxane, glass fibers and polyamic acid, then uniformly coating the mixed solution on a rigid substrate, then sequentially carrying out low-temperature pre-curing treatment and high-temperature curing treatment on the mixed solution, and finally separating the flexible cover plate from the rigid substrate through water boiling demoulding to obtain a polyimide flexible cover plate doped with glass fibers; the high mechanical strength of the glass fiber is utilized, so that the wear resistance of the flexible cover plate is improved, and the hardness of the flexible cover plate is improved; the deformation resistance of the flexible cover plate is improved by utilizing the high elastic modulus characteristic of the glass fiber, and the flexibility of the flexible cover plate is improved; the flexible cover plate meets the requirements of hardness and flexibility at the same time, the quality of the flexible display device is improved, and the service life of the flexible display device is prolonged.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a flowchart of a process for manufacturing a flexible cover according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a flexible cover plate according to an embodiment of the present invention.
Detailed Description
While the embodiments and/or examples of the present invention will be described in detail below in conjunction with the specific embodiments of the present invention, it is to be understood that the embodiments and/or examples described below are only a part of the embodiments and/or examples of the present invention, and not all of the embodiments and/or examples. All other embodiments and/or examples, which can be obtained by a person skilled in the art without making any inventive step, based on the embodiments and/or examples of the present invention, belong to the scope of protection of the present invention.
Directional terms used in the present invention, such as [ upper ], [ lower ], [ left ], [ right ], [ front ], [ rear ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding and is in no way limiting. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
Aiming at the problem that the hardness and the flexibility of the existing flexible cover plate cannot be considered at the same time, the invention provides the flexible cover plate and the preparation method thereof, which can relieve the problem.
In an embodiment, referring to fig. 1, fig. 1 shows a flowchart of a method for manufacturing a flexible cover according to an embodiment of the present invention. As shown in fig. 1, a method for manufacturing a flexible cover plate according to an embodiment of the present invention includes:
step S101, preparing a mixed solution containing aminopropyl siloxane, glass fibers and polyamic acid;
step S102, uniformly coating the mixed solution on a rigid substrate;
step S103, carrying out low-temperature pre-curing treatment on the mixed solution to obtain an amidoacid-imide random copolymer film doped with aminopropyl siloxane and glass fibers;
step S104, carrying out high-temperature curing treatment on the amic acid-imide random copolymer film to obtain a polyimide flexible cover plate doped with glass fibers, wherein the glass fibers have a three-dimensional net structure;
and S105, removing the film through water boiling, and separating the flexible cover plate from the rigid substrate.
The preparation method of the flexible cover plate is used in the embodiment, the preparation method comprises the steps of firstly preparing a mixed solution containing aminopropyl siloxane, glass fibers and polyamic acid, then uniformly coating the mixed solution on a rigid substrate, then sequentially carrying out low-temperature pre-curing treatment and high-temperature curing treatment on the mixed solution, and finally separating the flexible cover plate from the rigid substrate through water boiling to remove a film, so as to obtain the polyimide flexible cover plate doped with the glass fibers; the high mechanical strength of the glass fiber is utilized, so that the wear resistance of the flexible cover plate is improved, and the hardness of the flexible cover plate is improved; the deformation resistance of the flexible cover plate is improved by utilizing the high elastic modulus characteristic of the glass fiber, and the flexibility of the flexible cover plate is improved; so that the flexible cover plate meets the requirements of hardness and flexibility at the same time.
In one embodiment, the step of preparing the mixed solution including aminopropylsiloxane, glass fiber and polyamic acid includes:
a polyamic acid solution was prepared.
Specifically, dianhydride, diamine and polyamine monomers are subjected to low-temperature copolymerization in a polar aprotic solvent to obtain a polyamic acid solution; wherein the dianhydride is one or more of 3,3', 4' -pyromellitic dianhydride, 3', 4' -biphenyl tetracarboxylic dianhydride, 4' -hexafluoroisopropyl phthalic anhydride and 3,3', 4' -benzophenone tetracarboxylic dianhydride; the diamine is one or more of 1, 4-p-phenylenediamine, 1, 4-diphenyldiamine, 4' -diaminoanisole and 2,2' -bis (trifluoromethyl) -4,4' -diaminobiphenyl; the polyamine is one or more of triamine, tetramine and pentamine, such as triamine tri (4-aminophenoxy) benzene; the polar aprotic solvent is one or more of N-methylpyrrolidone, N-dimethylformamide and dimethylacetamide;
the reaction temperature of the low-temperature copolymerization is-10 ℃, the low-temperature copolymerization in the embodiment of the invention is a technique known in the art, and a person skilled in the art can select raw materials and process parameters according to specific situations.
The aminopropylsiloxane and glass fibers were uniformly dispersed in a polar aprotic solvent.
Adding aminopropyl siloxane and glass fibers into the polar aprotic solvent, and uniformly dispersing the aminopropyl siloxane and the glass fibers into the polar aprotic solvent by high-speed stirring; the order of adding the aminopropyl siloxane and the glass fiber in the polar aprotic solvent can be that the aminopropyl siloxane is added firstly and then the glass fiber is added, or the glass fiber is added firstly and then the aminopropyl siloxane is added, or the aminopropyl siloxane and the glass fiber are added simultaneously;
the polar aprotic solvent is one or more of N-methyl pyrrolidone, N-dimethylformamide and dimethylacetamide, so that the polyamic acid solution, the aminopropyl siloxane and the glass fiber can be uniformly mixed in the subsequent mixing process with the polyamic acid solution.
And adding the polyamic acid solution into the polar aprotic solvent, and uniformly mixing the polyamic acid solution, the aminopropyl siloxane and the glass fiber to form a mixed solution.
Adding the polyamic acid solution into the polar aprotic solvent in which the aminopropyl siloxane and the glass fibers are dispersed, and then stirring at a high speed to uniformly mix the polyamic acid solution, the aminopropyl siloxane and the glass fibers to form a mixed solution; or adding the polar aprotic solvent in which the aminopropylsiloxane and the glass fibers are dispersed into the polyamic acid solution, and then stirring at a high speed to uniformly mix the polyamic acid solution, the aminopropylsiloxane and the glass fibers to form a mixed solution;
in the process, the aminopropyl siloxane acts as a coupling agent to promote the glass fibers to be fully dispersed in the polyamic acid solution.
In one embodiment, since the coating method of the organic solvent is well known in the art, the step of uniformly coating the mixed solution on the rigid substrate can be performed by a person skilled in the art according to the specific situation by using a suitable coating device and a suitable coating method. In the embodiment of the present invention, the rigid substrate is a substrate structure having a certain hardness and stiffness, and includes, but is not limited to, a glass substrate, a metal substrate, and preferably a glass substrate.
In one embodiment, the step of performing a low-temperature pre-curing treatment on the mixed solution to obtain the amic acid-imide random copolymer film doped with aminopropyl siloxane and glass fibers comprises:
and carrying out low-temperature pre-curing treatment on the mixed solution at the temperature ranging from 120 ℃ to 180 ℃ in a vacuum environment, and removing the polar aprotic solvent in the mixed solution to obtain the aminopropyl siloxane and glass fiber doped amic acid-imide random copolymer film. The polar aprotic solvent is heated to vaporize and evaporate at a temperature ranging from 120 ℃ to 180 ℃, preferably 150 ℃, and the vaporization of the polar aprotic solvent can be accelerated by heating in a vacuum environment.
The mixed solution is subjected to low-temperature pre-curing treatment before high-temperature curing, so that the polar aprotic solvent is slowly evaporated under a low-temperature condition, and the problem that the quality of the flexible cover plate is influenced due to generation of bubbles caused by overhigh temperature in the evaporation process of the polar aprotic solvent is solved.
In one embodiment, the step of subjecting the amic acid-imide random copolymer film to a high-temperature curing process to obtain a polyimide flexible cover plate doped with glass fibers, wherein the glass fibers have a three-dimensional network structure, comprises:
and (3) carrying out high-temperature curing treatment on the amic acid-imide random copolymer film at the temperature of 350-450 ℃ in a nitrogen environment, wherein the temperature is preferably 400 ℃, and the heating time is 30 minutes. In the high-temperature curing process, aminopropyl siloxane plays a role of a crosslinking point, so that the amic acid-imide random copolymer is subjected to crosslinking reaction to form a crosslinked network structure, and the glass fiber-doped polyimide flexible cover plate is obtained. The nitrogen environment avoids polyimide from being oxidized in the high-temperature curing process, so that the obtained flexible cover plate is yellow to influence the light transmission effect of the flexible cover plate.
The flexible cover plate obtained after high-temperature curing is a polyimide flexible cover plate doped with glass fibers, and the glass fibers are doped in the flexible cover plate, so that the high mechanical strength of the glass fibers is utilized, the wear resistance of the flexible cover plate is improved, and the hardness of the flexible cover plate is improved; the deformation resistance of the flexible cover plate is improved by utilizing the high elastic modulus characteristic of the glass fiber, and the flexibility of the flexible cover plate is improved; so that the flexible cover plate meets the requirements of hardness and flexibility at the same time.
In one embodiment, the step of separating the flexible cover sheet from the rigid substrate by water boiling off the film comprises:
and putting the flexible cover plate and the rigid substrate into water, heating the water to 70-100 ℃, and separating the flexible cover plate from the rigid substrate, wherein the temperature of the water is preferably 80 ℃.
In an embodiment, please refer to fig. 2, and fig. 2 is a structural solid diagram of a flexible cover plate according to an embodiment of the present invention. The flexible cover plate 20 provided by the invention is a polyimide flexible cover plate doped with glass fiber 201, and the doping concentration range of the glass fiber 201 is 2-10%, preferably 5%.
The embodiment provides a glass fiber-doped polyimide flexible cover plate, wherein the glass fiber is doped in the flexible cover plate, so that the high mechanical strength of the glass fiber is utilized, the wear resistance of the flexible cover plate is improved, and the hardness of the flexible cover plate is improved; the deformation resistance of the flexible cover plate is improved by utilizing the high elastic modulus characteristic of the glass fiber, and the flexibility of the flexible cover plate is improved; so that the flexible cover plate meets the requirements of hardness and flexibility at the same time.
Further, as shown in fig. 2, the glass fiber 201 has a three-dimensional network structure. The three-dimensional reticular structure of the glass fiber further enhances the wear resistance of the flexible cover plate on the basis of the one-dimensional structure, and further improves the hardness of the flexible cover plate; and meanwhile, the deformation resistance of the flexible cover plate is further enhanced, and the flexibility of the flexible cover plate is improved.
The flexible cover sheet 20 has a thickness in the range of 50 to 100 microns. Compared with a cover plate formed by a polyimide flexible substrate and a hardened layer or an ultrathin glass cover plate, the flexible cover plate 10 provided by the embodiment of the invention has the advantages that the wear resistance and flexibility of the flexible cover plate are improved, the hardened layer is omitted, and the thickness of the flexible cover plate is reduced.
The hardness of the flexible cover plate 20 is more than 5 cloth, and the requirement of the flexible cover plate on the hardness is met.
The light transmittance of the flexible cover plate 20 is greater than 90%, and the requirement of the flexible cover plate on the light transmittance is met.
In one embodiment, the present invention also provides a flexible display device comprising:
a Display panel including, but not limited to, an OLED (Organic Light-Emitting Diode) Display panel and an LCD (Liquid Crystal Display) Display panel;
the flexible cover plate is a polyimide flexible cover plate doped with glass fibers.
The embodiment provides a display device, which comprises a glass fiber doped polyimide flexible cover plate, wherein the glass fiber is doped in the flexible cover plate, so that the high mechanical strength of the glass fiber is utilized to increase the wear resistance of the flexible cover plate and improve the hardness of the flexible cover plate; the deformation resistance of the flexible cover plate is improved by utilizing the high elastic modulus characteristic of the glass fiber, and the flexibility of the flexible cover plate is improved; the flexible cover plate meets the requirements of hardness and flexibility at the same time, the quality of the flexible display device is improved, and the service life of the flexible display device is prolonged.
In one embodiment, the glass fibers have a three-dimensional network structure. The three-dimensional reticular structure of the glass fiber further enhances the wear resistance of the flexible cover plate on the basis of the one-dimensional structure, and further improves the hardness of the flexible cover plate; and meanwhile, the deformation resistance of the flexible cover plate is further enhanced, and the flexibility of the flexible cover plate is improved.
The flexible cover plate has a thickness in a range of 50 to 100 microns. Compared with a cover plate formed by a polyimide flexible substrate and a hardened layer or an ultrathin glass cover plate, the flexible cover plate provided by the embodiment of the invention has the advantages that the wear resistance and flexibility of the flexible cover plate are improved, the hardened layer is omitted, and the thickness of the flexible cover plate is reduced.
The hardness of the flexible cover plate is more than 5 cloth, and the requirement of the flexible cover plate on the hardness is met.
The light transmittance of the flexible cover plate is larger than 90%, and the requirement of the flexible cover plate on the light transmittance is met.
The doping concentration of the glass fibers ranges from 2% to 10%, preferably 5%.
According to the above embodiment:
the embodiment of the invention provides a flexible cover plate and a preparation method thereof, and a flexible display device, wherein the preparation method comprises the steps of firstly preparing a mixed solution containing aminopropyl siloxane, glass fibers and polyamic acid, then uniformly coating the mixed solution on a rigid substrate, then sequentially carrying out low-temperature pre-curing treatment and high-temperature curing treatment on the mixed solution, and finally separating the flexible cover plate from the rigid substrate through water boiling demoulding to obtain a polyimide flexible cover plate doped with glass fibers; the high mechanical strength of the glass fiber is utilized, so that the wear resistance of the flexible cover plate is improved, and the hardness of the flexible cover plate is improved; the deformation resistance of the flexible cover plate is improved by utilizing the high elastic modulus characteristic of the glass fiber, and the flexibility of the flexible cover plate is improved; the flexible cover plate meets the requirements of hardness and flexibility at the same time, the quality of the flexible display device is improved, and the service life of the flexible display device is prolonged.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A method for preparing a flexible cover plate is characterized by comprising the following steps:
preparing a mixed solution including aminopropylsiloxane, glass fiber and polyamic acid;
uniformly coating the mixed solution on a rigid substrate;
carrying out low-temperature pre-curing treatment on the mixed solution to obtain an amidoacid-imide random copolymer film doped with aminopropyl siloxane and glass fibers;
carrying out high-temperature curing treatment on the amic acid-imide random copolymer film to obtain a polyimide flexible cover plate doped with glass fibers, wherein the glass fibers have a three-dimensional network structure;
and (3) separating the flexible cover plate from the rigid substrate by water boiling to remove the film.
2. The method according to claim 1, wherein the step of preparing the mixed solution comprising aminopropylsiloxane, glass fiber and polyamic acid comprises:
preparing a polyamic acid solution;
uniformly dispersing aminopropylsiloxane and glass fibers into a polar aprotic solvent;
and adding the polyamic acid solution into the polar aprotic solvent, and uniformly mixing the polyamic acid solution, the aminopropyl siloxane and the glass fiber to form a mixed solution.
3. The method of claim 1, wherein the low temperature pre-cure temperature ranges from 120 ℃ to 180 ℃ and the low temperature pre-cure gas environment is a vacuum environment.
4. The method of claim 1, wherein the temperature of the high temperature curing is in a range of 350 ℃ to 450 ℃, and the gas environment of the high temperature curing is a nitrogen environment.
5. The method of claim 1, wherein the poaching to remove the film is at a temperature in the range of 70 ℃ to 100 ℃.
6. A flexible cover plate prepared by the preparation method of any one of claims 1 to 5, wherein the flexible cover plate is a glass fiber-doped polyimide flexible cover plate.
7. The flexible cover sheet of claim 6, wherein the glass fibers have a three-dimensional network structure.
8. The flexible cover sheet of claim 6, wherein the glass fibers are doped at a concentration in the range of 2% to 10%.
9. The flexible cover sheet of claim 6, wherein the flexible cover sheet has a thickness in a range of 50 microns to 100 microns.
10. A flexible display device, comprising:
a display panel;
the flexible cover sheet according to any one of claims 6 to 9, which is produced by the production method according to any one of claims 1 to 5.
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