How to prevent black edge creases on glass folding screens

Abstract

The present invention discloses a method for preventing black edge creases on foldable glass screens, belonging to the technical field of foldable glass screens. The present invention adheres a polyimide film to the edge of the back of the glass to form a hollow space, which is then filled with a curing adhesive containing hollow fly ash microbeads, and the glass is then cured. The present invention utilizes hollow fly ash microbeads to enable a folded glass screen to quickly return to its original shape after being unfolded, thus significantly improving the problem of black edge creases that occur during repeated folding of the glass screen.

Description

Technical Field

[0001] The present invention relates to the technical field of glass folding screens, and in particular to a method for preventing black edge creases on glass folding screens. Background Art

[0002] For the current folding screen market, there are mainly UTG glass and polyimide (CPI) folding screens. However, compared with UTG glass, polyimide (CPI) material has lower light transmittance and poor touch, and it is easy to produce creases after repeated folding. Therefore, UTG glass is the mainstream material in the future folding screen market. However, after UTG glass is processed into folding cover glass, due to the characteristics of the process, a black border must be set on the outside of the UTG glass folding screen. After a long period of repeated folding, creases are likely to occur at the black edge position. This is because the center of the glass folding screen has been closed and bent for a long time, and it will have the inertia of bending and concave when unfolded. When the glass folding screen is flattened, there is a certain space left below and there is a lack of supporting structure, so there will be a downward concave space. Although UTG glass is resistant to folding, it will still cause black creases to deposit at the black edge position of the glass folding screen, affecting the visual effect. Therefore, there is an urgent need for a method to improve the black edge creases of glass folding screens. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide a method for preventing black edge creases on glass folding screens. Friction-resistant and fluid fly ash hollow microbeads are used as fillers. When the glass folding screen is opened horizontally, the fluidity of the filler can be used to quickly restore the glass folding screen to its original state. This can greatly improve the problem of black edge creases caused by repeated folding of the glass folding screen.

[0004] The technical solution of the present invention is:

[0005] The method for preventing black edge creases on a glass folding screen comprises the following steps:

[0006] S1 prepares curing glue;

[0007] S2 adds powdered fly ash hollow microbeads to the curing glue while stirring, and mixes them evenly to form a filler. The curing glue in the filler is used to fix the fly ash hollow microbeads in the hollow space between the polyimide film and the glass folding screen to be produced later. Otherwise, due to the fluidity of the fly ash hollow microbeads, when the glass folding screen is subjected to force, the fly ash hollow microbeads are likely to slide;

[0008] S3 uses OCA optical adhesive to adhere a polyimide film to the black frame on the back of the glass, and then cures it to make the polyimide film completely adhere to the black frame on the back of the glass. Then, nitrogen gas is passed between the polyimide film and the glass to form a hollow space.

[0009] S4: applying a filler into the hollow space formed in step S3;

[0010] S5 cures the coated glass, and then uses OCA optical glue to stick the back of the glass to the screen, thus obtaining a glass folding screen that is free of black edge creases.

[0011] Preferably, in step S1, the curing adhesive comprises the following components in percentage by mass: 10%-15% propylene glycol methyl ether, 10%-15% ethyl acetate, 10%-15% acrylic acid, and 55%-70% methyl acrylate.

[0012] Preferably, in step S1, the curing adhesive is prepared by adding propylene glycol methyl ether and ethyl acetate into a stirring barrel and stirring, then adding acrylic acid and stirring together, and finally continuously adding methyl acrylate and stirring.

[0013] Preferably, the stirring speed of propylene glycol methyl ether and ethyl acetate is 230-240 rpm, and the stirring time is 10-15 min; the stirring speed of adding acrylic acid is 350-400 rpm, and the stirring time is 5-10 min; the stirring speed of adding methyl acrylate is 350-400 rpm, and the stirring time is 5-10 min.

[0014] Preferably, in step S2, the mass ratio of the curing adhesive to the fly ash hollow microbeads is 1.2-1.6:1.

[0015] Preferably, in step S3, a curing adhesive is evenly coated on the front surface of the glass, and a strengthening film is formed on the surface of the glass after curing.

[0016] Preferably, in step S3, the curing method is: the glass coated with the curing adhesive is first dried for surface curing, and then UV ultraviolet deep curing is performed, and the two curings make the curing more complete.

[0017] Preferably, in step S5, the curing method is as follows: the glass coated with the filler is first dried for surface curing, and then subjected to UV deep curing. Because the filler is filled in the hollow space, if only a single curing process is performed, only the surface filler will be cured, while the internal filler will not be fully cured. Therefore, a double curing process can further improve the curing effect.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The method of the present invention can produce a glass folding screen with a composite structure, in which a polyimide film is bonded to the edge of the back of the glass to form a hollow space, and a curing glue containing fly ash hollow microbeads is filled therein, and the glass is then cured. With the help of fillers, the present invention can quickly restore the folded glass folding screen to its original state after opening, which can greatly improve the problem of black edge creases generated by the glass folding screen during repeated folding. The present invention also applies curing glue on the front of the glass to form a layer of strengthening film, which can enhance the impact resistance of the glass folding screen, improve the uneven stress of the glass, and then improve the deformation and warping of the glass, thereby reducing the accumulation of fillers in the black edge part, and effectively preventing the problem of black edge creases. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a diagram showing the crease effect of the glass folding screen produced in Example 1 of the present invention after folding.

[0022] Figure 2 This is a diagram showing the crease effect of the glass folding screen produced in Example 2 of the present invention after folding.

[0023] Figure 3 This is a diagram showing the crease effect of the glass folding screen produced in Comparative Example 1 of the present invention after folding.

[0024] Figure 4 This is a diagram showing the crease effect of the glass folding screen produced in Comparative Example 2 of the present invention after folding. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] Example 1

[0027] The method of preventing black edge creases on a glass folding screen in this embodiment includes the following steps:

[0028] S1: Prepare curing adhesive: Add propylene glycol methyl ether and ethyl acetate into mixing bucket A and stir at 230 rpm for 10 minutes. Then, add acrylic acid and stir at 350 rpm for 5 minutes. Finally, add methyl acrylate and stir continuously at 350 rpm for 5 minutes. The mass percentages of the components in the curing adhesive are: 10% propylene glycol methyl ether, 10% ethyl acetate, 10% acrylic acid, and 70% methyl acrylate.

[0029] S2: Pour the prepared curing glue into the mixing barrel B, add the powdered fly ash hollow microbeads while stirring, and mix them evenly to form a filler;

[0030] S3 uses OCA optical adhesive to adhere the polyimide film to the black frame on the back of the glass. After surface curing in an oven, it is deep-cured with UV light to ensure that the polyimide film is completely adhered to the black frame on the back of the glass. Nitrogen is then introduced between the polyimide film and the glass to form a hollow space.

[0031] S4 uses a Tacmina pulse-free pump and a sandwich coating method to apply the filler containing fly ash hollow microspheres into the hollow space between the polyimide film and the glass through a flow meter;

[0032] The S5 will first pass the glass coated with filler through an air-floating non-contact heat drying oven for surface curing, and then deep-curing it through UV ultraviolet rays. After curing, the back of the glass is bonded to the screen with OCA optical glue to produce a glass folding screen that is free of black edges and creases.

[0033] The above operations are all carried out in a Class 100 cleanroom. The finished glass folding screen is repeatedly opened and closed 100,000 times on a multi-point staggered bending test machine to observe the black edge creases of the glass folding screen. Figure 1 shown.

[0034] Example 2

[0035] The method of preventing black edge creases on a glass folding screen in this embodiment includes the following steps:

[0036] S1: Prepare curing adhesive: same as in Example 1;

[0037] S2: Pour a portion of the prepared curing glue into the mixing barrel B, add the powdered fly ash hollow microbeads while stirring, and mix well to form a filler;

[0038] S3 evenly applies the curing glue on the front of the glass, and then performs surface curing in an air-floating non-contact heat drying oven. After exiting the oven, it is further subjected to UV deep curing to form a strengthening film on the glass surface. OCA optical adhesive is used to adhere the polyimide film to the black frame position on the back of the glass. After surface curing in the oven, it is further subjected to UV deep curing to ensure that the polyimide film is completely adhered to the black frame position on the back of the glass. Subsequently, nitrogen gas is introduced between the polyimide film and the glass to form a hollow space.

[0039] S4 uses a Tacmina pulse-free pump and a sandwich coating method to apply the filler containing fly ash hollow microspheres into the hollow space between the polyimide film and the glass through a flow meter;

[0040] The S5 will first pass the glass coated with filler through an air-floating non-contact heat drying oven for surface curing, and then deep-curing it through UV ultraviolet rays. After curing, the back of the glass is bonded to the screen with OCA optical glue to produce a glass folding screen that is free of black edges and creases.

[0041] The above operations are all carried out in a Class 100 cleanroom. The finished glass folding screen is repeatedly opened and closed 100,000 times on a multi-point staggered bending test machine to observe the black edge creases of the glass folding screen. Figure 2 shown.

[0042] Comparative Example 1

[0043] The conventional black-edge glass folding screen manufacturing method includes the following steps:

[0044] S1 uses screen printing to print ink onto the black border of the glass to complete the black border production;

[0045] After the S2 ink is printed, it is cured using an oven and UV lamp. After curing, the back of the glass is bonded to the screen using OCA optical glue to produce a glass folding screen.

[0046] The above operations are all carried out in a Class 100 cleanroom. The finished glass folding screen is repeatedly opened and closed 100,000 times on a multi-point staggered bending test machine to observe the black edge creases of the glass folding screen. Figure 3 shown.

[0047] Comparative Example 2

[0048] The method for manufacturing a glass folding screen coated with a strengthening film includes the following steps:

[0049] S1: Prepare curing adhesive: same as in Example 1;

[0050] S2 evenly applies the curing glue on the front of the glass, and then performs surface curing in an air-floating non-contact heat drying oven. After exiting the oven, it is further subjected to UV deep curing to form a strengthening film on the glass surface.

[0051] S3 produces black edges according to the method of comparative example 1;

[0052] After the S4 ink is printed, the ink is cured using an oven and UV lamp. After curing, the back of the glass is bonded to the screen using OCA optical glue to produce a glass folding screen.

[0053] The above operations are all carried out in a Class 100 cleanroom. The finished glass folding screen is repeatedly opened and closed 100,000 times on a multi-point staggered bending test machine to observe the black edge creases of the glass folding screen. Figure 4 shown.

[0054] Depend on Figure 1-4It can be seen that the glass folding screen produced in Comparative Example 1 using a conventional black-border production method exhibited severe creases after repeated opening and closing and folding 100,000 times; whereas the glass folding screens produced using the methods of Example 1 and Comparative Example 2 exhibited less creases after repeated opening and closing and folding 100,000 times compared to Comparative Example 1. This is because the fly ash hollow microspheres in Example 1 have the characteristics of reducing glass shrinkage and warping, being friction-resistant, and having high fluidity. When the glass folding screen is repeatedly folded at the crease, the cured adhesive containing the fly ash hollow microspheres at the black border corresponding to the crease will expand due to repeated friction at the crease. At this time, the fly ash hollow microspheres contained within the cured adhesive will move with the thermally expanded cured adhesive due to their high fluidity, flowing regularly during the repeated folding movement. When the folded glass folding screen is restored, the fly ash hollow microspheres will slowly flow back to their original positions. Combined with the friction resistance of fly ash hollow microspheres, long-term folding will not cause particle dispersion at the fold, thus preventing the problem of missing white creases at the black edge of the folding glass screen. In contrast, in Comparative Example 2, a layer of curing adhesive is applied to the front of the glass, forming a reinforced protective film on its surface. On the one hand, the reinforced film can effectively alleviate the impact of external stress on the folding glass screen; on the other hand, the folding glass screen is a brittle material and still has a certain amount of stress after forming. When subjected to external impact, it is easy to cause uneven stress and cause micro-deformation of the glass. The amount of warping at the micro-deformation will change. When warping exists at the black edge crease, it will affect the flow and release of the black edge filler, causing the filler to accumulate in the warped or deformed area. In contrast, in Comparative Example 2, a layer of curing adhesive is applied to the glass surface. The components in the curing adhesive formula are mostly ester organic compounds, which have a certain degree of flexibility. After being applied to the glass surface, it is equivalent to adding a layer of adhesive film on its surface, which can form a compressive stress layer on the glass surface, squeezing out some microcracks caused by external stress and preventing their growth. This can improve the uneven stress of the glass, and then improve the deformation and warping of the glass, thereby reducing the accumulation of fillers in the black edge part, effectively preventing the problem of black edge creases. In addition, it can be further seen from the creases of Examples 1-2 and Comparative Example 2 that, compared to Example 1, which only fills the back of the glass with curing adhesive containing fly ash hollow microbeads, and Comparative Example 2, which only applies a layer of strengthening film to the glass folding screen, the glass folding screen of Example 2 hardly folds, greatly improving the problem of black edge creases.

[0055] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present invention may easily conceive of changes or substitutions within the technical scope disclosed in the present invention, and such changes or substitutions shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for preventing black edge creases on a glass folding screen, characterized in that: The following steps are involved: S1 prepares curing glue; S2 adds powdered fly ash hollow microbeads to the solidified adhesive while stirring, and mixes them evenly to form a filler; S3 uses OCA optical adhesive to adhere a polyimide film to the black frame on the back of the glass, and then cures it to make the polyimide film completely adhere to the black frame on the back of the glass. Then, nitrogen gas is passed between the polyimide film and the glass to form a hollow space. S4: applying a filler into the hollow space formed in step S3; S5 solidifies the coated glass and then bonds the back of the glass to the screen, thus obtaining a foldable glass screen with anti-black edge creases. In step S1, the curing adhesive includes the following components in percentage by mass: 10%-15% propylene glycol methyl ether, 10%-15% ethyl acetate, 10%-15% acrylic acid, and 55%-70% methyl acrylate; In step S1, the curing adhesive is prepared by adding propylene glycol methyl ether and ethyl acetate into a mixing barrel and stirring, then adding acrylic acid and stirring together, and finally continuously adding methyl acrylate and stirring; In step S2, the mass ratio of the curing adhesive to the fly ash hollow microbeads is 1.2-1.6:

1.

2. The method for preventing black edge creases on a folding glass screen according to claim 1, characterized in that: The stirring speed of propylene glycol methyl ether and ethyl acetate is 230-240 rpm, and the stirring time is 10-15 minutes; the stirring speed of adding acrylic acid is 350-400 rpm, and the stirring time is 5-10 minutes; the stirring speed of adding methyl acrylate is 350-400 rpm, and the stirring time is 5-10 minutes.

3. The method for preventing black edge creases on a folding glass screen according to claim 1, wherein: In step S3, a curing adhesive is evenly coated on the front surface of the glass, and a strengthening film is formed on the surface of the glass after curing.

4. The method for preventing black edge creases on a folding glass screen according to claim 1, wherein: In step S3, the curing method is as follows: the glass coated with the curing adhesive is first dried for surface curing, and then subjected to UV deep curing.

5. The method for preventing black edge creases on a folding glass screen according to claim 1, wherein: In step S5, the curing method is as follows: the glass coated with the filler is first dried for surface curing, and then subjected to UV deep curing.

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