Acid-resistant protective film liquid for ultra-thin glass edge processing as well as preparation method and application of acid-resistant protective film liquid

Abstract

The invention belongs to the technical field of glass processing, and relates to an acid-resistant protective film liquid for ultrathin glass edge processing, and a preparation method and application thereof. The acid-resistant protective film liquid comprises the following components in parts by mass: 100 parts of phenolic resin with different molecular weights; 25 to 35 parts of acrylic resin; 5.1-10 parts of an additive; the additive comprises a flatting agent and a tackifier; and 520-560 parts of a solvent. The preparation method comprises the following steps: mixing phenolic resins with different molecular weights, mixing with a solvent, and heating and stirring until the phenolic resins are completely dissolved to obtain a phenolic resin solution; mixing acrylic resin with a solvent, heating and stirring until the acrylic resin is completely dissolved to obtain an acrylic resin solution; mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution; and mixing the additive with the mixed resin solution, and uniformly stirring to obtain the acid-resistant protective film solution. The problems of film thickness uniformity and poor base material adhesion of the acid-resistant protective film liquid are effectively solved, and the stability of the acid-resistant protective film liquid is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of glass processing, and in particular relates to an acid-resistant protective film liquid for ultra-thin glass edge processing, a preparation method and application thereof. Background Art

[0002] Ultra-Thin Glass (UTG) has the advantages of being not easy to be scratched, having a good touch feeling, and a transmittance of over 90%, which can bring a better viewing experience to users. Currently, ultra-thin glass is gradually becoming the mainstream material for mobile phone manufacturers.

[0003] The thickness of ultra-thin glass is generally 30-100 microns. After laser cutting, the edges are sharp and there are many micro cracks at the corners, which is not conducive to the post-processing of mobile phone folding screens. In order to remove the micro cracks remaining after UTG cutting and avoid sharp edges, the glass edges need to be chemically etched to remove the tiny micro cracks on the glass edges and make the edges smoother, effectively improving the beauty and safety of UTG.

[0004] The existing UTG edge chamfering process requires the ultra-thin glass to be coated with glue, coated with acid-proof glue, etched at the edge, separated by glue dissolution, and other subsequent processing steps. This method of processing the UTG edge is not only time-consuming, but also causes the residual glue after hydrolysis to be not thoroughly cleaned, and the edge pickling solvent penetration causes in-plane / edge etching pits, resulting in a low one-time yield.

[0005] The current mainstream processing method is to use ink or glue to coat the front and back of the glass, without coating the edges, and then use acid etching to etch the glass edges, thereby making the glass edges smoother and rounder to form edge chamfers. In order to achieve glass edge chamfering, an acid-resistant protective film liquid is required, with good uniformity of film thickness, good adhesion to the glass substrate, and a transmittance of more than 85%.

[0006] After searching, the patent document with application number 202211268684.4 proposes to use UV adhesive protective film to cover both sides of the glass for protection. The protective film has complex components and a cumbersome processing process, and there is a risk of peeling damage and uncleanness;

[0007] Patent document with application number 202310854750.4 proposes a method for processing a single piece of ultra-thin glass, which adopts the method of spraying acid-resistant protective ink on the front and back sides of the raw ultra-thin glass, and then performing acid washing and chamfering morphology treatment after laser cutting. The acid-resistant protective ink components include epoxy-containing polymers, phenolic hydroxyl-containing polymers, amino-containing polymers, etc. The transmittance of the obtained protective film is not high, and sodium hydroxide solution is required for subsequent stripping to remove the protective ink, which will damage the glass substrate. Summary of the invention

[0008] The purpose of the present invention is to provide an acid-resistant protective film liquid for ultra-thin glass edge processing and a preparation method and application thereof, which solves the problems of uniform film thickness and poor substrate adhesion of the acid-resistant protective film liquid coating and improves the stability of the acid-resistant protective film liquid.

[0009] The present invention is achieved through the following technical solutions:

[0010] An acid-resistant protective film liquid for ultra-thin glass edge processing, comprising, by weight:

[0011] 100 parts of phenolic resins of different molecular weights;

[0012] 25-35 parts of acrylic resin;

[0013] 5. 1 to 10 parts of additives; the additives include leveling agents and tackifiers;

[0014] 520-560 parts of solvent.

[0015] Further, the phenolic resins of different molecular weights include low molecular weight phenolic resins, medium molecular weight phenolic resins and high molecular weight phenolic resins;

[0016] The molecular weight of the low molecular weight phenolic resin is 1000-2000, the molecular weight of the medium molecular weight phenolic resin is 4000-5000, and the molecular weight of the high molecular weight phenolic resin is 9000-10000.

[0017] Furthermore, based on mass proportions, the low molecular weight phenolic resin is 1 to 5 parts, the medium molecular weight phenolic resin is 50 to 60 parts and the high molecular weight phenolic resin is 35 to 45 parts.

[0018] Furthermore, the molecular weight of the acrylic resin is 10,000 to 15,000.

[0019] Furthermore, the additive includes 0.1 to 1 parts of a leveling agent and 4 to 9 parts of a tackifier.

[0020] Furthermore, the leveling agent is a polyether siloxane copolymer surfactant; and the tackifier is an organic silane coupling agent.

[0021] Furthermore, the solvent is propylene glycol methyl ether acetate.

[0022] The present invention also discloses a method for preparing the acid-resistant protective film liquid for ultra-thin glass edge processing, comprising:

[0023] The phenolic resins with different molecular weights are mixed, and then mixed with the solvent, and heated and stirred until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0024] Mixing the acrylic resin and the solvent, heating and stirring until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0025] Mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0026] The additive is mixed with the mixed resin solution, and stirred evenly to obtain an acid-resistant protective film solution.

[0027] Furthermore, when preparing the phenolic resin solution and the mixed resin solution, the heating temperature is 45-55°C.

[0028] The invention also discloses the application of the acid-resistant protective film liquid in ultra-thin glass edge processing. The acid-resistant protective film liquid is diluted with a solvent to a viscosity required by a coating process, and a spraying process is adopted to form a film layer on the surface of the ultra-thin glass after baking and curing.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] The present invention discloses an acid-resistant protective film liquid, which uses a combination of phenolic resins with different molecular weights to form a uniform and dense film skeleton structure, and is matched with acrylic resin, and the joint action of polyether siloxane copolymer surfactant and organic silane coupling agent forms an acid-resistant protective film liquid with good wettability on the surface of a glass substrate. The molecular weight of the phenolic resin and acrylic resin used in the present invention is smaller than that of ordinary resin polymers, and is dissolved in a solvent to form a low-viscosity resin solution. Under the joint action of a leveling agent and a tackifier, a film layer with good film uniformity is formed on the glass surface, and the glass substrate interface has good adhesion, and can be soaked in hydrofluoric acid for a long time, so as to achieve glass cross-section etching morphology control, effectively solve the problems of film thickness uniformity and poor substrate adhesion of the acid-resistant protective film liquid, and improve the stability of the acid-resistant protective film liquid.

[0031] Furthermore, the present invention further refines the specific types and molecular weight ranges of phenolic resins with different molecular weights, which helps to accurately control the performance of phenolic resins in the formula. Phenolic resins with different molecular weights may play different roles in the protective film liquid. Small molecular weight phenolic resins may help to improve permeability, and medium molecular weight and large molecular weight phenolic resins play an important role in the strength and stability of the film.

[0032] Furthermore, the specific mass fractions of small, medium and large molecular weight phenolic resins were determined, making the formula of the protective film liquid more specific and operable. By clarifying the proportions of each component, the performance of the protective film liquid can be ensured to be stable, which facilitates quality control during the production process.

[0033] Furthermore, the molecular weight range of the acrylic resin is specified to be 10,000 to 15,000 to ensure the specific properties of the protective film liquid. The acrylic resin with a specific molecular weight may have advantages in terms of acid resistance, adhesion, etc.

[0034] Furthermore, the leveling agent can improve the surface flatness of the protective film liquid, and the tackifier can improve the adhesion of the film, thereby improving the overall performance of the protective film liquid.

[0035] Furthermore, the specific type of solvent was determined to be propylene glycol methyl ether acetate, which helps to ensure the solubility and stability of the protective film liquid. Propylene glycol methyl ether acetate has good solubility for phenolic resin, acrylic resin and additives, and may have low toxicity and volatility during use.

[0036] Further, the present invention also discloses a method for preparing the acid-resistant protective film liquid. The phenolic resin and the acrylic resin are completely dissolved in the solvent respectively by heating and stirring, and the uniform dispersion of each component in the solution can be ensured, so that the performance advantages of the phenolic resin and the acrylic resin can be fully utilized, so that the prepared protective film liquid has better stability and consistency. At the same time, complete dissolution also helps to improve the coating performance of the film liquid, ensuring that a uniform and continuous protective film can be formed in the subsequent application process. The phenolic resin solution, the acrylic resin solution and the final mixed resin solution are prepared in stages, which is convenient for testing and adjusting the quality of the solution at each stage. If a problem is found at a certain stage, it can be dealt with in time without affecting the entire preparation process. This staged preparation method helps to improve the quality stability of the product and reduce the defective rate. Finally, the additive is mixed with the mixed resin solution, and stirred evenly to obtain an acid-resistant protective film liquid concentrate, which can ensure that the additive plays a full role in the film liquid, such as the leveling agent can improve the surface flatness of the film liquid, and the tackifier can improve the adhesion of the film. The uniform mixing of the additives helps to improve the overall performance of the protective film liquid and meet the needs of different application scenarios.

[0037] The present invention also discloses the application of the acid-resistant protective film liquid, which adopts a spraying process and is baked and solidified to form a film layer with good uniformity of film thickness, high transmittance, high adhesion and high density on the glass surface. The film layer has good adhesion to the interface of the glass substrate and can be soaked in hydrofluoric acid for a long time to achieve glass cross-section etching morphology control, effectively solving the problems of film thickness uniformity and poor substrate adhesion of the acid-resistant protective film liquid coating, and improving the stability of the acid-resistant protective film liquid. The protective film liquid can provide effective protection for edge processing of ultra-thin glass. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following is further described in detail with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] The detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention claimed for protection, but merely represents a selected embodiment of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0040] The present invention discloses an acid-resistant protective film liquid for ultra-thin glass edge processing, which comprises, by weight:

[0041] 100 parts of phenolic resins of different molecular weights;

[0042] 25-35 parts of acrylic resin;

[0043] 5. 1 to 10 parts of additives; the additives include leveling agents and tackifiers;

[0044] 520-560 parts of solvent.

[0045] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0046] Example 1

[0047] Embodiment 1 of the present invention discloses an acid-resistant protective film liquid, which comprises, by weight:

[0048] 100 parts of phenolic resins with different molecular weights; 25 parts of acrylic resins; 5.1 parts of additives, wherein the additives include 0.1 parts of leveling agents and 5 parts of tackifiers; and 520 parts of propylene glycol methyl ether acetate.

[0049] The 100 parts of phenolic resins with different molecular weights specifically include 3 parts of low molecular weight phenolic resins, 55 parts of medium molecular weight phenolic resins and 42 parts of high molecular weight phenolic resins.

[0050] The leveling agent used is Maitu 408, and the tackifier used is KH550.

[0051] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0052] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0053] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0054] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0055] 4) Add Maitu 408 and KH550 to the mixed resin solution and stir evenly to obtain an acid-resistant protective film solution.

[0056] Example 2

[0057] Embodiment 2 of the present invention discloses an acid-resistant protective film liquid, which comprises, by weight:

[0058] 100 parts of phenolic resins with different molecular weights; 30 parts of acrylic resins; 11 parts of additives, wherein the additives include 1 part of a leveling agent and 10 parts of a tackifier; and 540 parts of propylene glycol methyl ether acetate.

[0059] The 100 parts of phenolic resins with different molecular weights specifically include 5 parts of low molecular weight phenolic resin, 60 parts of medium molecular weight phenolic resin and 35 parts of high molecular weight phenolic resin.

[0060] The leveling agent used is HY-5030, and the tackifier used is KH560.

[0061] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0062] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0063] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 45° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0064] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0065] 4) Add HY-5030 and KH560 to the mixed resin solution and stir evenly to obtain the acid-resistant protective film solution.

[0066] Example 3

[0067] Embodiment 3 of the present invention discloses an acid-resistant protective film liquid, which comprises, by weight:

[0068] 100 parts of phenolic resins with different molecular weights; 35 parts of acrylic resins; 7.1 parts of additives, wherein the additives include 0.1 parts of leveling agents and 7 parts of tackifiers; and 560 parts of propylene glycol methyl ether acetate.

[0069] The 100 parts of phenolic resins with different molecular weights specifically include 1 part of a low molecular weight phenolic resin, 55 parts of a medium molecular weight phenolic resin and 44 parts of a high molecular weight phenolic resin.

[0070] The leveling agent used is HY-5030, and the tackifier used is KH560.

[0071] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0072] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0073] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 55° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0074] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0075] 4) Add HY-5030 and KH560 to the mixed resin solution and stir evenly to obtain the acid-resistant protective film solution.

[0076] Example 4

[0077] Embodiment 4 of the present invention discloses an acid-resistant protective film liquid, which comprises, by weight:

[0078] 100 parts of phenolic resins with different molecular weights; 30 parts of acrylic resins; 5.1 parts of additives, wherein the additives include 0.1 parts of leveling agents and 5 parts of tackifiers; and 540 parts of propylene glycol methyl ether acetate.

[0079] The 100 parts of phenolic resins with different molecular weights specifically include 5 parts of low molecular weight phenolic resin, 50 parts of medium molecular weight phenolic resin and 45 parts of high molecular weight phenolic resin.

[0080] The leveling agent used is HY-5030, and the tackifier used is KH560.

[0081] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0082] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0083] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0084] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0085] 4) Add HY-5030 and KH560 to the mixed resin solution and stir evenly to obtain the acid-resistant protective film solution.

[0086] Example 5

[0087] Embodiment 5 of the present invention discloses an acid-resistant protective film liquid, which comprises, by weight:

[0088] 100 parts of phenolic resins with different molecular weights; 30 parts of acrylic resins; 6.5 parts of additives, wherein the additives include 0.5 parts of leveling agents and 6 parts of tackifiers; and 540 parts of propylene glycol methyl ether acetate.

[0089] The 100 parts of phenolic resins with different molecular weights specifically include 4 parts of low molecular weight phenolic resins, 60 parts of medium molecular weight phenolic resins and 36 parts of high molecular weight phenolic resins.

[0090] The leveling agent used is Maitu 408, and the tackifier used is KH550.

[0091] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0092] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0093] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0094] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0095] 4) Add Maitu 408 and KH550 to the mixed resin solution and stir evenly to obtain an acid-resistant protective film solution.

[0096] Example 6

[0097] Embodiment 6 of the present invention discloses an acid-resistant protective film liquid, which comprises, by weight:

[0098] 100 parts of phenolic resins with different molecular weights; 35 parts of acrylic resins; 7.1 parts of additives, wherein the additives include 0.1 parts of leveling agents and 7 parts of tackifiers; and 560 parts of propylene glycol methyl ether acetate.

[0099] The 100 parts of phenolic resins with different molecular weights specifically include 5 parts of low molecular weight phenolic resin, 55 parts of medium molecular weight phenolic resin and 40 parts of high molecular weight phenolic resin.

[0100] The leveling agent used is Maitu 408, and the tackifier used is KH570.

[0101] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0102] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0103] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0104] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0105] 4) Add Maitu 408 and KH570 to the mixed resin solution and stir evenly to obtain an acid-resistant protective film solution.

[0106] When used, the acid-resistant protective film liquid prepared in the embodiment of the present invention is diluted with propylene glycol methyl ether acetate to the viscosity required by the coating process, and the diluted acid-resistant protective film liquid is evenly sprayed on the front and back surfaces of the glass by a spraying process. After curing at 110°C for 30 minutes, it is baked at 135°C for 30 minutes, and the film thickness and uniformity, transmittance, adhesion, pencil hardness and acid resistance time are tested.

[0107] Comparative Example 1

[0108] Comparative Example 1 discloses an acid-resistant protective film liquid, which comprises, by weight:

[0109] 100 parts of phenolic resins with different molecular weights; 30 parts of acrylic resins; 0.1 parts of additives, wherein the additives include 0.1 parts of leveling agents; and 520 parts of propylene glycol methyl ether acetate.

[0110] The 100 parts of phenolic resins with different molecular weights specifically include 3 parts of low molecular weight phenolic resins, 55 parts of medium molecular weight phenolic resins and 42 parts of high molecular weight phenolic resins.

[0111] The leveling agent used is Momentive 408.

[0112] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0113] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0114] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0115] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0116] 4) Add Maitu 408 to the mixed resin solution and stir evenly to obtain an acid-resistant protective film solution.

[0117] Comparative Example 2

[0118] Comparative Example 2 discloses an acid-resistant protective film liquid, which comprises, by weight:

[0119] 100 parts of phenolic resins with different molecular weights; 10 parts of acrylic resins; 0.1 parts of additives, wherein the additives include 0.1 parts of leveling agents and 6 parts of tackifiers; and 540 parts of propylene glycol methyl ether acetate.

[0120] The 100 parts of phenolic resins with different molecular weights specifically include 3 parts of low molecular weight phenolic resins, 55 parts of medium molecular weight phenolic resins and 42 parts of high molecular weight phenolic resins.

[0121] The leveling agent used is Maitu 408, and the tackifier used is KH550.

[0122] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0123] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0124] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0125] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0126] 4) Add Maitu 408 and KH550 to the mixed resin solution and stir evenly to obtain an acid-resistant protective film solution.

[0127] Comparative Example 3

[0128] Comparative Example 3 discloses an acid-resistant protective film liquid, which comprises, by weight:

[0129] 100 parts of phenolic resins with different molecular weights; 50 parts of acrylic resins; 0.1 parts of additives, wherein the additives include 0.1 parts of leveling agents and 6 parts of tackifiers; and 540 parts of propylene glycol methyl ether acetate.

[0130] The 100 parts of phenolic resins with different molecular weights specifically include 3 parts of low molecular weight phenolic resins, 55 parts of medium molecular weight phenolic resins and 42 parts of high molecular weight phenolic resins.

[0131] The leveling agent used is Maitu 408, and the tackifier used is KH550.

[0132] The method for preparing an acid-resistant protective film liquid of this embodiment includes the following steps:

[0133] 1) mixing a phenolic resin consisting of a low molecular weight phenolic resin, a medium molecular weight phenolic resin and a high molecular weight phenolic resin with propylene glycol methyl ether acetate, and stirring at 50° C. until the phenolic resin is completely dissolved to obtain a phenolic resin solution;

[0134] 2) mixing acrylic resin and propylene glycol methyl ether acetate, and stirring under heating condition of 50° C. until the acrylic resin is completely dissolved, to obtain an acrylic resin solution;

[0135] 3) mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution;

[0136] 4) Add Maitu 408 and KH550 to the mixed resin solution and stir evenly to obtain an acid-resistant protective film solution.

[0137] After the test is completed, the glass sheet is placed in a stripping solution to remove the protective film. The main components of the stripping solution are monoethanolamine (MEA), dimethyl sulfoxide (DMSO) and diethylene glycol monobutyl ether (BDG).

[0138] Table 2 Test results of acid-resistant protective film liquids prepared in Examples 1 to 6 and Comparative Examples 1 to 3

[0139]

[0140] As can be seen from Table 2, in Comparative Example 1, no tackifier was added, and the acid resistance time of the obtained film layer was only 10 minutes. In Comparative Example 2, less acrylic resin was added, and the transmittance of the obtained film layer was low, which was not conducive to the uniformity of subsequent laser cutting. In Comparative Example 3, more acrylic resin was added, and the transmittance of the obtained film layer was higher, but its pencil hardness and adhesion properties were reduced, which was not conducive to subsequent processing operations.

[0141] In summary, by using medium and low molecular weight phenolic resins and combining them with acrylic resins, and by the combined action of high-efficiency nonionic surfactants and organic silane coupling agents, an acid-resistant protective film liquid with good wettability on the surface of the glass substrate is formed. By using a spraying process and baking and curing, a film layer with good uniformity of film thickness, high transmittance, high adhesion and high density is formed on the glass surface. The film layer can withstand a long period of immersion in hydrofluoric acid, and a high etching depth of the glass appearance is achieved, which effectively solves the problems of uniformity of film thickness and poor adhesion to the substrate of the acid-resistant protective film liquid, and improves the stability of the acid-resistant protective film liquid.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An acid-resistant protective film liquid for ultra-thin glass edge processing, characterized in that: Calculated by mass, including: 100 parts of phenolic resins of different molecular weights; 25-35 parts of acrylic resin; 5. 1 to 10 parts of additives; the additives include leveling agents and tackifiers; 520-560 parts of solvent.

2. The acid-resistant protective film liquid for ultra-thin glass edge processing according to claim 1, characterized in that: The phenolic resins of different molecular weights include low molecular weight phenolic resin, medium molecular weight phenolic resin and high molecular weight phenolic resin; The molecular weight of the low molecular weight phenolic resin is 1000-2000, the molecular weight of the medium molecular weight phenolic resin is 4000-5000, and the molecular weight of the high molecular weight phenolic resin is 9000-10000.

3. The acid-resistant protective film liquid for ultra-thin glass edge processing according to claim 2, characterized in that: Calculated by weight, the low molecular weight phenolic resin is 1 to 5 parts, the medium molecular weight phenolic resin is 50 to 60 parts and the high molecular weight phenolic resin is 35 to 45 parts.

4. The acid-resistant protective film liquid for ultra-thin glass edge processing according to claim 1, characterized in that: The molecular weight of the acrylic resin is 10,000 to 15,000.

5. The acid-resistant protective film liquid for ultra-thin glass edge processing according to claim 1, characterized in that: The additives include 0.1 to 1 parts of a leveling agent and 4 to 9 parts of a tackifier.

6. The super acid-resistant protective film liquid for ultra-thin glass edge processing according to claim 5, characterized in that: The leveling agent is a polyether siloxane copolymer surfactant; and the tackifier is an organic silane coupling agent.

7. The acid-resistant protective film liquid for ultra-thin glass edge processing according to claim 1, characterized in that: The solvent is propylene glycol methyl ether acetate.

8. The method for preparing the acid-resistant protective film liquid for ultra-thin glass edge processing according to any one of claims 1 to 7, characterized in that: include: The phenolic resins with different molecular weights are mixed, and then mixed with the solvent, and heated and stirred until the phenolic resin is completely dissolved to obtain a phenolic resin solution; Mixing the acrylic resin and the solvent, heating and stirring until the acrylic resin is completely dissolved, to obtain an acrylic resin solution; Mixing the phenolic resin solution and the acrylic resin solution to obtain a mixed resin solution; The additive is mixed with the mixed resin solution, and stirred evenly to obtain an acid-resistant protective film solution.

9. The preparation method according to claim 8, characterized in that: When preparing the phenolic resin solution and the mixed resin solution, the heating temperature is 45-55°C.

10. Application of the acid-resistant protective film liquid according to any one of claims 1 to 7 in ultra-thin glass edge processing, characterized in that: The acid-resistant protective film liquid is diluted with a solvent to a viscosity required by a coating process, and a spraying process is adopted to form a film layer on the surface of the ultra-thin glass after baking and curing.

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