HIGH-TEMPERATURE PROCESS

Technical Field

The present disclosure relates to a composite material of an inorganic material and an optional organic material. Specifically, the present disclosure relates to a coating used in a glass production process; more specifically, the present disclosure relates to a protective coating for glass and a protective layer formed by the protective coating for glass.

Background

In the process of manufacturing, transportation or storage of glass, the surface of glass is easily contaminated by various chemical reagents or damaged mechanically. Especially in recent years, more and more attention has been paid to smart phones. The process used to manufacture glass components of smart phones has higher requirements on the shape, flatness, and finish of glass surfaces.

For example, in the process of manufacturing curved glass of smart phones, it is necessary to heat the glass to a high temperature of 700°C, or even 750°C or more, and bend the glass in an atmosphere of 20 atm. When heated at high temperature, due to the use of a graphite mold, contaminants in the graphite mold are easily trapped on the softened glass surface, resulting in tarnish stains or pitting defects, thus reducing the yield of products.

Existing methods use a peelable adhesive polymer film to protect a glass substrate during production. For example, Chinese patent publication No. CN108084788A (Zheng Wen-Zhong et al.) relates to a processing-resistant waterborne glass protective ink and preparation method and application thereof. The processing-resistant waterborne glass protective ink is prepared by using the following raw materials based on percent by weight: 3% to 35% of waterborne polyurethane emulsion, 40% to 85% of acrylic resin solution, 2.0% to 15% of thixotropic agent, 0.1% to 1.5% of defoaming agent, 0.1% to 1.7% of defoaming agent, 0.1% to 1.5% of adhesion promoter, 0.1% to 5.5% of carboxylic ester, 0.1% to 1.5% of carboxylate, 0.1% to 1.0% of zinc salt, 0.2% to 5.0% of defoaming agent waterborne color paste, and 1% to 20% of relevant polyurethane thickener.

However, the inventor found that a protective film of a pure organic material could not resist higher temperature (700°C, or even higher temperature) in a glass thermoforming process. In this process, an organic protection film is easily decomposed, burned or carbonized, and the carbonized material cannot protect the glass substrate from being contaminated by the mold. Therefore, it is necessary to provide a temporary protective film for glass which can provide good protection for the glass surface at the temperature of high-temperature sintering and can be easily removed after sintering.

Summary

To solve one or more of the above problems, the inventor provides the technical solution of the present disclosure.

According to a first aspect of the present disclosure, a protective coating for glass is provided, and the protective coating for glass comprises water, an aluminium-containing silicate component, and optional latex particles.

According to a second aspect of the present disclosure, a temporary protective layer applied to a glass surface is provided, and the temporary protective layer comprises the protective coating for glass provided according to the first aspect.

According to a third aspect of the present disclosure, a method of protecting glass in a high-temperature process is provided, and the method comprises: 1) applying the protective coating for glass according to the first aspect of claims onto a glass surface; 2) removing water in the protective coating for glass to form a protective layer; 3) performing a high-temperature process, wherein the high temperature is 600°C-900°C, and optionally applying pressure of 0.1- 2MPa; and 4) removing the protective layer by water washing.

A temporary protective coating composition for glass comprising an aluminium- containing silicate material (including aluminosilicate formed by A1 and/or Si) and optionally latex particles in a compounding manner, and a temporary protective layer obtained from the coating is provided in the present disclosure. The coating and protective layer of the present disclosure can prevent a glass surface from being contaminated by external particles in a glass thermoforming process. After sintering at high temperature (700°C or more, or even 750°C or more), the protective layer becomes a loose laminated structure, and then the sintered temporary protective layer can be easily washed off by water. It can prevent the contamination from external environments (graphite mold or other ceramic molds) during high-temperature sintering, and at the same time can prevent the glass form being contaminated by the protective layer.

Brief Description of the Drawings

FIG. 1 illustrates SEM images of polyurethane latex clay composite coating before and after sintering in embodiment 1-1;

FIG. 2 illustrates comparison between coating appearances before and after sintering of a coating plus after water rinsing in the technical solution of embodiment 1-1; and FIG. 3 illustrates SEM images of clay particles with different particle sizes (purified) and clay without purification and particle size selection.

Detailed Description

In the description of specific implementations below, specific details are described to provide a comprehensive understanding of each disclosed implementation. However, those skilled in the art would realize that the purpose of the present disclosure may be achieved by adopting similar methods and materials without using one or more of these specific details when reading the description of the present disclosure.

Unless otherwise specified in the present application, in the entire description and claims, the terms “including”, “comprising”, “containing” and the like should be interpreted as open and inclusive meaning, that is, “including but not limited to”. It is desirable to point out that, on the basis in which some technical solutions of the present disclosure adopt “including a certain component” or “comprising a certain component”, the technical solution (composition) may only be composed of these components in other alternative implementations. In addition, the sum of the content (e.g., the sum of the mass) of the components in the composition is 100%. On the other hand, although the open expression of “including” or “comprising” is used in the present disclosure, in the implementations of the present disclosure, the protective coating or protective layer may only be composed of the components, and other components not described are excluded from the composition.

As mentioned above, in order to cope with higher sintering temperature and higher requirements on the shape and surface of glass, the existing organic coatings are not suitable for sintering at higher temperature. In addition, the inventor found that an inorganic material alone would cause adhesion between the glass surface and the inorganic material, which are also difficult to be removed after sintering.

The inventor surprisingly found that the mixture of latex particles and some particle materials containing aluminium-containing silicate can solve the problems of glass protection during high-temperature sintering and coating removal after sintering. Such coating and temporary protective layer obtained are advantageous solutions to protect the glass from being contaminated by the mold.

In some solutions provided in the present disclosure, the protective coating comprises an aluminium-containing silicate component, water, and optional latex particles, wherein the aluminium-containing silicate component includes aluminium-containing silicate.

The aluminium-containing silicate in the present disclosure includes a layered or chain layered structure. For example, the aluminum -containing silicate particles may contain a layered or chain-layered mineral structure composed of silica (S1O ₂ ) and alumina (AI ₂ O ₃ ) and other possible mineral elements, and may further include organic components, and mineral particles containing organic components may be formed into clay or other natural/synthetic mineral materials.

In other solutions, the used aluminium-containing silicate mineral particles has a layered structure, and the lamellar structure of aluminosilicate may be, for example, a double-layer structure, a three-layer structure or a multi-layer structure with a stereo polyhedron, so as to facilitate peeling and preventing it from being adhered to glass after high-temperature heating or sintering.

The protective coating in the present disclosure can provide good protection for high- temperature sintered glass products. Aluminosilicate mineral particles can hardly react with the glass surface at high temperature, while small particles of mineral materials can form stable semi gel in water to form a stable film.

In addition to A1 and/or Si, the mineral particles of aluminium-containing silicate may further contain one or more elements of Li, Na, K, Ca, Mg, Fe, Cr, Cu and Ti. In alternative solutions, the mineral particles of aluminium-containing silicate do not contain Mg and Ca elements.

In alternative solutions of the present disclosure, the aluminium-containing silicate particle component includes clay particles.

In a solution of the present disclosure, an emulsifier or a dispersant may be further included. The emulsifier or dispersant can assist in stabilizing the uniformity and gel of the mineral particles or clay particles. A solution of the present disclosure may further comprise or may not comprise (other) reinforcing components/materials (such as fibers and the like).

The main component of clay is a layered aluminosilicate mineral, which has smaller particles. Clay may be classified into layered minerals with rigid lattice, such as kaolin and the like; clay may also be layered minerals with expansive lattice, such as bentonite and montmorillonite; and clay may also be layered minerals with fibrous structure. In the clay obtained from geological materials, clay particles are mainly composed of layered silicate minerals, which contain a certain amount of water remaining in the mineral structure. It is known that the clay particles can form an oriented film by dispersing in water or alcohol. The clay particles are easily dispersed in water and can be easily manufactured into a uniform film. In addition, due to the excellent affinity between the clay and hydrophilic chemicals, it also contributes to formation of complexes. As will be explained in more detail below, a mixture of clay-like materials and optional latex particles can form a continuous film after being applied to the glass. In addition, after sintering, due to the hydrophilicity of the clay, the remaining film material is easily removed from the glass when washed with water. This provides a temporary and beneficial protection for the glass from being contaminated by molds. In further alternative solutions, the aluminium-containing silicate particle component is one or more selected from bentonite, montmorillonite, kaolin, illite, chlorite, pyrophyllite, vermiculite and allophane.

According to the chemical components and compositions, the aluminium-containing silicate particle component is one or more selected from aluminium-containing silicates of the following chemical compositions: AhfSiO _t KOH^; Na _x (Al2- _x ,Mg _x )2[Si40io](OH)2 .nthO (the value of X is 0-2); Al ₂ [Si ₂ 0 ₅ ](0H) ₄ , A1 ₂ [¾05](0H) ₄ .h H ₂ 0; K<1(A1, R ²⁺ ) ₂ [(Si,Al)Si ₃ Oio][OH]2 nH ₂ 0 (R ²⁺ is Mg ²⁺ and/or Fe ²⁺ ); Y3[Z ₄ O _IO ](OH)2 U ₃ (OH) ₆ (Y is one or more selected from Mg ²⁺ , Fe ²⁺ , Al ³⁺ or Fe ³⁺ , Z is selected from Si and/or Al); and (Mg,Al) ₂ [Si ₄ Oio] ₂ (OH).4H ₂ 0.

Those skilled in the art can clearly know the expression of silicate component in clay. For example, the composition of bentonite may be expressed by Na _x (Al2- _x ,Mg _x )2[Si ₄ Oio](OH)2 .nFFO (the value of X is 0-2), kaolin may be expressed by AhfS OsKOH)^ or AhfS OsKOFQzi.n FhO, in which kaolin contains part of adsorbed water ¾0 that can be removed during heating and drying (about 100°C), and constitution water (OH) escapes form 600°C to 1000°C or more.

Those skilled in the art clearly know the source of the above particle components and the main compositions of the particles, as well as the composition and meaning of the chemical components in the art. It may come from natural mineral soil, or powdery substance obtained from stone material after corresponding milling process. In an implementation of the present disclosure, raw materials may also come from commercially available products. For example, for montmorillonite, which is a natural mineral of aluminosilicate, and the structural formula thereof may be expressed by, for example, Na _x (Al2- _x ,Mg _x )2[Si ₄ Oio](OH)2 .nH ₂ 0 to express main components thereof, and particulates thereof may have a lamellar structure (bentonite may have a three-layer lamellar structure).

In an implementation of the present invention, a selected latex is waterborne latex. The waterborne latex may be natural latex and/or artificial latex.

In an example of useful latex, one or more of polyurethane latex (PU latex), polyacrylate latex (PA latex), polystyrene latex, and poly(styrene-butadiene) latex (PSB latex) is used in an exemplary solution of the present disclosure. However, the implementation of the present disclosure is not limited thereto.

According to the different types of latex and modification of implementations, based on percent by weight, the ratio of the latex particles to the aluminium -containing silicate component is 0: 100 to 90: 10. In some embodiments, the ratio is 0: 100 to 80:20.

When the latex particles are used, the ratio of the latex component to the aluminium- containing silicate particle component is one of the problems that the inventor pays attention to. When the glass is heated at high temperature, the temperature used may be different according to the components of the glass. Therefore, the type and ratio of the latex component and the particle component may be adjusted according to different glass heating processes. As found by the inventor, when the glass is to be subjected to a heating temperature less than or equal to 750°C, the mass ratio of the latex particles to the aluminium -containing silicate component is preferably (0: 100)-(90: 10) or (0: 100 to (80:20); preferably, the mass ratio of the latex particles to the aluminium-containing silicate component is (60:40)-(80:20), or (60:40)-(50:50). This facilitates the protection for glass and the removal of residual protective coating after heating. When the glass is subjected to higher heating temperature, for example, higher than 770°C, the mass ratio of the solid substance in the emulsion component to the particle component is preferably (25 :75)-(50:50) (preferably (35:65) to (50:50), or (40:60 to (50:50)), which facilitates protection for glass and removal of coating. In addition, when heated or sintered at higher temperature, the particle component is preferably clay subjected to purification or particle size selection, comprising kaolin and/or bentonite.

The high-temperature heating or high-temperature sintering in the present disclosure may be performed at a temperature higher than 650°C; in some implementations, the temperature may be 650°C or more, and lower than 900°C; 700°C or more, and lower than 850°C; or 700°C or more, and 800°C or less.

In an alternative implementation of the present disclosure, a certain ratio of water to latex/aluminium -containing silicate component is set. In an implementation, according to different types of latex and modification of implementations, based on mass, the solid content of the protective coating is 1% to 19.5% of the total mass of the protective coating.

In an alternative implementation of the present disclosure, the size of the aluminium- containing silicate particle component is 100 pm or less, preferably the size of the aluminium- containing silicate particle component is 50 pm or less, and more preferably the size of the aluminium-containing silicate particle component is 30 pm or less.

A protective layer applied to the glass surface provided in the present disclosure comprises one or more of the protective coatings for glass in the above alternative solutions. The protective layer is obtained by applying the protective coating for glass onto the glass surface and removing water.

The protective layer applied onto the glass surface provided in the present disclosure has the following characteristics: at least one portion of the protective layer is still adhered to the glass when heated at a temperature of 700°C or more, preferably 750°C or more, more preferably 800°C or higher.

The protective layer applied to the glass surface provided in the present disclosure has a thickness of 5-500 um, and preferably 10-300 um.

A method of protecting glass in a high-temperature process provided in the present disclosure comprises: 1) applying the protective coating for glass according to any one of claims 1 to 11 onto a glass surface; 2) removing water in the protective coating for glass to form a protective layer; 3) performing a high-temperature process, wherein the high temperature is 600°C-900°C, and optionally applying pressure of 0.1-2 MPa; and 4) removing the protective layer by water wash. The coating and protective layer provided according to the implementations of the present disclosure can provide good temporary protection for glass during high-temperature heating. At the same time, after sintering, a bright and clean appearance of the sintered glass can be obtained only by simple washing with deionized water. Examples

The implementations of the present disclosure would be described below in combination with more specific experiments (embodiments and comparative examples).

Table 1: List of raw materials Experimental Example 1 : preparation of a composition of a protective coating for glass for heating glass at 750°C Embodiment 1-1

0.9g of SMP clay, 6.4g of R966 latex and 6.4g of deionized water were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform viscous dispersion was obtained. Embodiment 1-2

0.46g of SMP clay, 5.6g of R966 latex and 5.6g of deionized water were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform dispersion was obtained. Embodiment 1-3

5.6g of R966 latex, 5.6g of deionized water and 0.2g of SMP clay were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform dispersion was obtained. Embodiment 1-4

6.4g of R966 latex, 6.4g of deionized water and 0.9g of bentonite were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform dispersion was obtained. Embodiment 1-5

6.4g of R966 latex, 6.4g of deionized water and 0.9g of kaolin were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform dispersion was obtained. Embodiment 1-6

0.92g of SMP clay, 4.5g of 7015G latex and 4.1g of deionized water were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform viscous dispersion was obtained.

Comparative example 1-1

5.8 lg of Nalco DVSZN004 and 3g of R966 latex were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform viscous dispersion was obtained.

Comparative example 1-2

3.2ml of deionized water and 0.29g of Laponite RD clay were added into a 20ml glass vial, and the mixture thereof was stirred for 15 minutes by mechanical stirring at a speed of 1000 rpm until the clay was completely dispersed and a uniform viscous dispersion was obtained. Comparative example 1-3

In this experiment, R966 latex was directly used as a coating component.

Preparation of temporary protective layer for glass surface For the coating prepared in each of the above Embodiments and Comparative examples, the coating with a thickness of about 150 pm was applied onto glass to be heated by using scrape coating. The sample was heated for 5 minutes at 120°C to remove the water by drying.

Heating glass at high temperature: the sample was placed on a ceramic plate, and the side with the coating faced to the ceramic plate. Each sample was put into a heating furnace (SQFL- 1700 provided by Shanghai Precision Instrument Manufacturing Co., Ltd.). First, the heating furnace was vacuumed and then nitrogen was blown into the heating furnace until standard atmospheric pressure (1 atm) was reached. Then, a heating process (heating to 750°C within 35 minutes, holding at 750°C for 1 minute, and cooling to room temperature overnight) was started and the sample was continuously purged with nitrogen. The sample was washed with tap water and the coating residue was cleaned by wiping slightly. Then, the experimental result of each sample was checked. The results are shown in Table 2 below.

Table 2: Coatings of respective embodiments and experimental examples under sintering condition of 750°C

FIG. 1 illustrates SEM images of a coating of embodiment 1 before and after sintering. From the upper figure of FIG. 1, it can be seen that when the polymer latex and the clay particles are mixed according to a certain ratio, the clay/polymer latex dispersion is coated on the glass and dried to form a continuous film. Surprisingly, after sintering at 750°C, the polymer is decomposed, but the remaining portion of the coating becomes a loose clay laminated structure (see the lower figure of FIG. 1). At this moment, the coating is still robust and continuous enough to avoid contamination from foreign substances. Since the polymer is decomposed such that the coating becomes loose and the clay is hydrophilic, when washed with water, the clay expands and can be easily removed from the glass. In this way, the implementation of the present disclosure provides a good temporary protection solution for manufacturing glass (such as glass for mobile phone cover) during high-temperature heating with more stringent requirements.

Moreover, in the experimental temperature range of this experimental example, not only can the coating be continuously preserved, but also it can be completely washed off with water (see FIG. 2). From the physical photographs of embodiment 1-1, it can be seen that before and after sintering, the coating of the present disclosure can form a uniform protective layer to provide a good temporary protection for glass during high-temperature heating. At the same time, after sintering, a bright and clean appearance of the sintered glass can be obtained only by simple washing with deionized water, thereby avoiding adhesion result caused by using inorganic materials alone.

Experimental example 2: preparation of a composition of a protective coating for glass for heating glass at a temperature higher than 750°C

In this embodiment, purified clay or kaolin having smaller particle size and clay that is not subjected to purification and particle selection were used as particle components, respectively.

Therefore, in an alternative or preferred solution of the present disclosure, the selected clay, bentonite, montmorillonite, kaolin, illite soil, chlorite soil, pyrophyllite soil, vermiculite soil and allophane soil were purified and/or modified raw material products. Purification and/or modification may be performed by using surfactants or other nano-materials.

In an alternative solution, the particle sizes of the above clay, bentonite, montmorillonite, kaolin, illite soil, chlorite soil, talc soil, pyrophyllite soil, vermiculite soil and allophane soil were less than 100 pm, preferably less than 50 pm, and more preferably less than 30 pm. Comparative example 2- 1 (preparation of clay dispersion)

5.06g of Optigel WH (white clay powder) and 47.6g of deionized water were added to a 200ml plastic bottle, and the mixture was stirred for lh by a magnetic bar until the clay was completely dispersed and a uniform viscous dispersion was obtained.

3.55g of viscous dispersion (9.6% clay dispersion) in comparative example 2-1 and 0.08g of R966 latex were added to a 20ml glass vial, and the mixture was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

4.78g of viscous dispersion (9.6% clay dispersion) in comparative example 2-1 and 1.39g of R966 latex were added to a 20ml glass vial, and the mixture was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

5.05g of viscous dispersion (9.6% clay dispersion) in comparative example 2-1 and 0.08g of DL 510PA PSB latex were added to a 20ml glass vial, and the mixture was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

0.9 lg of Optigel white clay 0.91 and 9.3g of deionized water were added to a 20ml glass vial, and the mixture was stirred for lh by a magnetic bar. Then, 1 82g of DL 510PA PSB latex was added and mixed for lh to obtain a uniform viscous dispersion.

Lmbodiment 2-1 (preparation ot clay dispersion sumected to purilication and particle size selection)

52g of SFV clay powder (clay that is purified as purchased and that has an average particle size of 30 micrometers based on Scanning Electron Microscopic analysis) and 753.6g of deionized water were added to a 1L plastic bottle, and the dispersion was stirred for lh by mechanical stirring at a speed of 630 rpm until the clay was completely dispersed and a uniform viscous dispersion was obtained.

Embodiment 2-2

6.58g of dispersion in embodiment 2-3 and 0.18g of R966 latex were added to a 20ml glass vial, and the dispersion was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

Embodiment 2-3

4.65g of dispersion in embodiment 2-1 and 0.82g of R966 latex were added to a 20ml glass vial, and the dispersion was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion. Embodiment 2-4

4.76g of dispersion in embodiment 2-1 and 4.47g of R966 latex were added to a 20ml glass vial, and the dispersion was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

Embodiment 2-5

2.91g of viscous dispersion (6.5% clay dispersion) in embodiment 2-1 and 0.25g of DL 510PA PSB latex were added to a 20ml glass vial, and the dispersion was stirred for lh by a magnetic bar until the clay was completely dispersed and a uniform viscous dispersion was obtained.

Embodiment 2-6

198g of dispersion (6.5% clay dispersion) in embodiment 2-1 and 25.6g of DL 510PA PSB latex were added to a 500ml plastic bottle, and the dispersion was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

Embodiment 2-7

137.4g of dispersion (6.5% clay dispersion) in embodiment 2-1 and 87.5g of DL 510PA PSB latex were added to a 500ml plastic bottle, and the dispersion was stirred for lh by a magnetic bar to obtain a uniform viscous dispersion.

Sintering was performed at a temperature of 770°C and a temperature of 800°C respectively in this series of experiments. For the coating prepared in each of the above embodiments and comparative examples, the coating with a thickness of about 150 pm was applied onto two sides of glass to be heated by using a glass bar coater, and the area of the coating was about 16cm ² . The sample was heated for 5 minutes at 120°C to remove the water by drying.

Heating glass at high temperature: the sample was placed in a 3D graphite mold. Each sample was put into a heating furnace (SQFL-1700 provided by Shanghai Precision Instrument Manufacturing Co., Ltd.). A weight of 16kg was loaded on the mold. First, the heating furnace was vacuumed and then nitrogen was blown into the heating furnace until standard atmospheric pressure (1 atm) was reached. Then, a heating process (heating to 770°C/800°C within 55/60 minutes, holding at 770°C/800°C for 1 minute, and cooling to room temperature overnight) was started and the sample was continuously purged with nitrogen. The sample was washed with tap water and the coating residue was cleaned by wiping slightly. Then, the experimental result of each sample was checked.

After the test is finished, effects of cleaning with deionized water were characterized by numerical values 0-5. 0-almostno visible stains (completely removed); 1-few small spots; 2-more small spots; 3-some large stains; 4-rough surface; 5-coating not completely removed. Table 3: Glass sintering process (55 minutes, 770°C/1 minute)

Table 4: Glass sintering process (60 minutes, 800°C/1 minute) In this series of experiments, the used SFV series clay was subjected to purification and particle size selection, while the WH clay was clay that is not purified and modified. The SEM images of FIG. 3 illustrate topography of the composition of clay particles subjected to purification and particle size selection and the WH clay that is not subjected to selection and purification. From the upper figure of FIG. 3, it can be seen that the purified clay particles have uniform particle size distribution, and the particle size thereof is small and about 30 pm, the clay with small particle size can cooperate with latex components to achieve better protection and peeling effect after sintering. From the comparative tests shown in the tables, it can be seen that the test at 800°C may be more challenging for the requirement on the protective film layer. For example, when sintering at higher temperature about 800°C, if the proportion of organic components (latex) is too low, it would not facilitate removal of the temporary protective layer. When the proportion of latex is too high (e.g., embodiment 8), more residual spots would be formed, which may also make the glass surface rough. In addition, the inventor also found that the performance of PSB latex is better than the performance of the PU latex in this series of tests, which can facilitate forming a clear and bright glass surface.

According to the implementations and technical contents described in the present disclosure, although the contents of the present disclosure include specific embodiments, it is obvious to a person skilled in the art that various replacements or changes in the forms and details can be made to these embodiments without departing from the spirit and scope of the claims of the present invention and equivalent technical solutions thereof. The embodiments described herein should be considered to be for the purpose of description only, instead of limitation. The description of features and aspects in each embodiment is considered to be applicable to similar features and aspects in other embodiments. Therefore, the scope of the present disclosure should not be limited by the specific description, but by the technical solutions of the claims, and all changes within the scope of the claims and equivalents thereof should be interpreted as included in the technical solutions of the present disclosure.