Research on the Requirements of Protective Film in the Processing and Application of AG Anti-glare Glass

With the continuous upgrading of display technology and the increasing demands for visual experience, AG anti-glare glass, due to its ability to effectively reduce surface reflectivity, minimize glare, and improve image clarity, has become a core component in various display terminals, automotive displays, industrial control panels, and building curtain walls. The core characteristic of AG anti-glare glass stems from its micron-level uneven structure formed through special processing. While this structure achieves excellent anti-glare effects, it also makes the surface fragile and susceptible to scratches, contamination, corrosion, and other damage. Especially throughout the entire processing and application process, a protective film is essential for comprehensive protection.

The processing of AG anti-glare glass is complex, encompassing multiple stages including glass substrate cleaning, surface roughening (chemical etching or physical sandblasting), coating preparation, curing, and cutting. Each stage places different demands on the performance of the protective film. Furthermore, its application scenarios vary significantly. Consumer electronics require a balance between protection and aesthetics, automotive applications need to withstand extreme temperatures and humidity, and industrial control applications require wear and impact resistance. These differences further enhance the personalized requirements for the protective film. Currently, issues such as surface scratches, residual adhesive, and decreased anti-glare performance in some AG anti-glare glass products are mostly related to improper selection and substandard performance of the protective film. Therefore, a systematic study of the core requirements for protective films in the processing and application of AG anti-glare glass, and clarifying the key points of protection in different stages and scenarios, is of great significance for improving the product quality, reducing production costs, and extending the service life of AG anti-glare glass. This article, based on the processing technology and application characteristics of AG anti-glare glass, comprehensively reviews the various requirements for protective films and proposes reasonable suggestions to provide a reference for industry practice.

1. Overview of AG Anti-Glare Glass

1.1 Structure and Characteristics of AG Anti-Glare Glass

AG anti-glare glass, also known as anti-reflective glass, has a core structure formed on the surface of ordinary glass substrate through processes such as chemical etching, physical sandblasting, or coating deposition. This structure converts incident light from specular reflection to diffuse reflection, thereby reducing surface reflectivity (typically to below 1%), reducing glare and reflections, while also reducing fingerprint residue and improving tactile comfort. Depending on the processing technology, AG anti-glare glass can be divided into chemically etched and physically sandblasted types. Chemical etching uses chemical reagents such as hydrofluoric acid to selectively erode the glass surface, resulting in a more uniform uneven structure and higher light transmittance, widely used in high-end display fields. Physical sandblasting uses high-pressure airflow to spray abrasive onto the glass surface; the process is simple and lower in cost, but the surface roughness is higher, and the light transmittance is relatively lower.

The core characteristics of AG anti-glare glass determine its surface fragility: the micron-level uneven structure reduces the surface contact area and hardness, making it easily scratched by sharp objects; surface gaps easily attract dust, oil, and other contaminants, which are difficult to clean; during processing steps such as chemical etching and coating curing, it is susceptible to the effects of chemical reagents and high temperatures, leading to surface structure damage and thus affecting anti-glare performance. Therefore, the protective film needs to provide targeted protection against these characteristics, avoiding surface damage without compromising its inherent anti-glare structure and performance.

1.2 Processing Flow and Application Scenarios of AG Anti-glare Glass

The typical processing flow of AG anti-glare glass is: glass substrate screening → cleaning → surface roughening (chemical etching/physical sandblasting) → plasma treatment → preheating → coating spraying → thermosetting → photocuring → cutting → inspection → packaging. Among these, surface roughening, coating curing, and cutting are the three stages with the highest requirements for the protective film. Surface roughening must prevent the protective film from adhering to or contaminating the glass surface; coating curing must withstand high-temperature environments; and cutting must ensure a tight fit between the protective film and the glass surface, with no residue or curling edges after cutting.

AG anti-glare glass has extremely wide applications, mainly covering three major areas: First, the consumer electronics field, including screens and back covers of smartphones, tablets, and laptops, and smartwatch faces, where the requirements for the protective film's light transmittance, adhesion, and appearance are extremely high; second, the automotive display field, including in-vehicle central control screens, instrument panels, and head-up display (HUD) glass, requiring it to withstand extreme temperature and humidity ranges from -40℃ to 85℃, and possessing properties such as UV resistance, aging resistance, and anti-fogging; and third, industrial control and special fields, including industrial control panels, medical equipment displays, building curtain walls, and outdoor advertising screens, where industrial control and medical applications require wear resistance, impact resistance, and chemical corrosion resistance, while building and outdoor applications require excellent weather resistance and UV resistance. The differences in various processing stages and application scenarios necessitate diverse performance indicators for protective films.

2. Requirements for Protective Films During AG Anti-Glare Glass Processing

The processing flow of AG anti-glare glass is complex, with significant differences in process conditions at different stages. The performance requirements for protective films vary, but the core principles revolve around three main areas: protection, compatibility, and ease of operation. Specifically, the film must protect the glass surface from damage, be compatible with the processing technology, and facilitate subsequent processes. Specific requirements are as follows:

2.1 Protective Film Requirements During Surface Roughening

Surface roughening is a core stage in AG anti-glare glass processing, involving both chemical etching and physical sandblasting. The core requirements for the protective film in this stage are chemical corrosion resistance, impact resistance, and non-polluting properties.

For chemical etching processes, the glass substrate needs to be coated with a protective film before immersion in corrosive agents such as hydrofluoric acid for surface etching. Therefore, the protective film must possess excellent chemical corrosion resistance, resisting the erosion of etching agents such as hydrofluoric acid and organic acids without dissolving, breaking, or deforming. Simultaneously, the edges of the protective film must be tightly adhered, free of bubbles and curling, to prevent etching agents from seeping into the gaps between the protective film and the glass, causing defects such as localized corrosion and scratches on the glass surface. Furthermore, the protective film itself must be free of volatile substances and have a surface free of impurities and residues to prevent the release of harmful substances or the shedding of impurities from the protective film, which could contaminate the etching agents or the glass surface and affect the uniformity of the anti-glare structure.

For physical sandblasting processes, high-pressure airflow carries abrasive particles to impact the glass surface for roughening. The protective film must possess sufficient impact resistance and surface hardness to withstand the high-speed impact of the abrasive particles without breaking or scratching. It must also be tightly adhered, without looseness or bubbles, to prevent abrasive particles from entering gaps and scratching the glass surface. Furthermore, the protective film in this stage must possess certain antistatic properties to prevent electrostatic adsorption of abrasive particles, which could lead to impurities remaining on the glass surface and affect the roughening effect.

Simultaneously, regardless of whether chemical etching or physical sandblasting is used, the roughened glass surface will form a micron-level uneven structure. The protective film must possess moderate adhesion, ensuring it adheres tightly to the glass surface to prevent detachment during processing, while also being easily peeled off after roughening without leaving any residue. This prevents residue from filling the gaps in the uneven structure, making it difficult to clean and affecting subsequent coating preparation and anti-glare performance.

2.2 Protective Film Requirements in Coating Preparation and Curing Stages

The coating preparation and curing stage is crucial for improving the surface performance of AG anti-glare glass. It typically includes three steps: AG anti-glare coating spraying, thermal curing, and UV curing. The core requirements for the protective film in this stage are high-temperature resistance, light transmittance, and compatibility.

AG anti-glare coatings are mostly prepared using materials such as silicone resins. After spraying, they require thermal curing (70~80℃) and UV curing (UV irradiation) treatments to form a dense, high-strength structure. Therefore, the protective film must possess excellent high-temperature resistance, remaining unaffected by shrinkage, deformation, yellowing, or decomposition under the high-temperature environment of thermosetting. Simultaneously, it must exhibit good UV resistance, resisting UV radiation during photocuring without aging or embrittlement, ensuring continuous protection throughout the curing process.

Furthermore, during coating spraying and curing, the protective film must maintain high light transmittance, especially for single-sided AG anti-glare glass. The protective film on the unprocessed side must guarantee a light transmittance ≥90% to avoid affecting UV radiation penetration and coating curing. Simultaneously, the protective film must be compatible with the coating material, not chemically reacting with the coating or releasing harmful substances, avoiding impacts on coating adhesion, hardness, and anti-glare performance. After curing, the protective film should not cause the coating to detach during peeling, ensuring the integrity of the coating structure.

2.3 Protective Film Requirements in Cutting and Inspection Stages The cutting stage is the final step in AG anti-glare glass processing. Based on actual application requirements, the cured glass must be cut to specified dimensions. The core requirements for the protective film in this stage are tight adhesion, cut resistance, and easy peeling.

During the cutting process, the cutting tool will contact the protective film and cut the glass. Therefore, the protective film must have a certain degree of cut resistance to withstand the friction and cutting force of the tool, preventing damage or tearing and avoiding direct scratches to the glass surface. Simultaneously, the protective film must adhere tightly to the glass surface, without air bubbles or looseness, ensuring even stress on the glass surface during cutting and preventing defects such as dimensional deviations and edge chipping due to poor adhesion.

The testing phase requires evaluating the surface quality, anti-glare performance, and light transmittance of the AG anti-glare glass. Therefore, the protective film must possess good light transmittance and appearance quality, with a surface free of scratches, impurities, and haze, ensuring the accuracy of the test results. Furthermore, after testing, the protective film must be easily peeled off without residue or marks, ensuring a clean and tidy glass surface for subsequent packaging and application.

2.4 General Requirements for the Entire Processing Flow In addition to the specific requirements for each stage mentioned above, the protective film must also meet the following general requirements throughout the entire AG anti-glare glass processing flow:

First, cleanliness requirements: The surface of the protective film must be free of dust, oil, and impurities, and it must be odorless and free of volatile harmful substances to avoid contaminating the glass surface.

Second, dimensional stability requirements: Within the temperature and humidity variation range during processing, the protective film must not shrink, stretch, or deform to ensure bonding accuracy and processing quality.

Third, environmental protection requirements: The protective film must comply with national environmental protection standards, be easily recyclable and degradable, and avoid causing environmental pollution.

Fourth, cost-effectiveness requirements: While meeting all performance requirements, the protective film must have a high cost-performance ratio to reduce the processing cost of AG anti-glare glass.

3. Requirements for Protective Films in AG Anti-Glare Glass Applications

AG anti-glare glass has diverse applications, with varying usage environments and needs across different scenarios. Therefore, the requirements for protective films also exhibit individualized characteristics. However, the core principles revolve around three key aspects: long-lasting protection, adaptability, and user experience. Specifically, the film must protect the glass from damage during use, be compatible with the application environment, and not affect the glass's performance or user experience. Specific requirements are as follows:

3.1 Protective Film Requirements in Consumer Electronics

Consumer electronics is the primary application scenario for AG anti-glare glass, including smartphones, tablets, and laptops. This sector has the most stringent requirements for protective films, focusing on light transmittance, adhesion, appearance, and feel.

Regarding light transmittance, AG anti-glare glass for consumer electronics must ensure a clear display. Therefore, the protective film must possess extremely high light transmittance (≥92%) and extremely low haze (≤1%), without affecting the glass's anti-glare performance and display clarity. It must also have good optical consistency, with no rainbow patterns or reflections, to avoid impacting the visual experience. In terms of adhesion, a low- or medium-low-adhesion design is required. This ensures a tight fit to the glass surface, preventing it from detaching or allowing dust to enter during daily use, while allowing for easy peeling when replacement is needed, leaving no residue and not damaging the anti-glare structure of the glass.

Regarding appearance, the protective film must possess good transparency and surface smoothness, free of scratches, impurities, and bubbles. The edges should be neatly cut, perfectly matching the glass size and not affecting the overall appearance and texture of the consumer electronics product. In terms of feel, the protective film surface must have good smoothness, reducing fingerprint residue, and providing a smooth, non-sticky touch, conforming to the usage habits of consumer electronics users. Furthermore, protective films for consumer electronics must also possess a certain level of abrasion resistance (pencil hardness ≥2H) to resist minor scratches from daily use and extend the lifespan of the AG anti-glare glass.

3.2 Protective Film Requirements for Automotive Displays AG anti-glare glass in automotive displays is mainly used for central control screens, instrument panels, and HUD glass. The operating environment is complex, requiring it to withstand extreme temperatures and humidity, UV radiation, vibration, and other factors. Therefore, the environmental adaptability of the protective film is extremely important.

Regarding temperature resistance, the temperature fluctuations in automotive environments are significant. The protective film must maintain stable performance within an extreme temperature and humidity range of -40℃ to 85℃, without shrinking, deforming, yellowing, becoming brittle, or peeling, ensuring effective protection under both high-temperature exposure and low-temperature freezing conditions. Regarding UV resistance, automotive glass is constantly exposed to sunlight. The protective film must possess excellent UV resistance (UV blocking rate ≥98%) to effectively block UV radiation, preventing aging and yellowing of the AG anti-glare glass surface, while also preventing UV rays from penetrating the protective film and damaging the vehicle's electronic components.

In addition, protective films for automotive displays must possess good vibration resistance and adhesion, able to withstand vibrations during vehicle operation without loosening or peeling; they must have a certain degree of anti-fogging performance to prevent fogging caused by temperature differences between the inside and outside of the vehicle, thus affecting display clarity; they must be wear-resistant and impact-resistant, resisting scratches and minor impacts during daily use, and must be odorless and free of volatile harmful substances, meeting automotive environmental standards.

3.3 Protective Film Requirements for Industrial Control and Specialty Applications AG anti-glare glass in industrial control and specialty applications is mainly used in industrial control panels, medical equipment displays, building curtain walls, outdoor advertising screens, etc. The core requirements for protective films in this field are wear resistance, impact resistance, chemical corrosion resistance, and weather resistance.

In the fields of industrial control and medical equipment, AG anti-glare glass frequently comes into contact with various chemical reagents (such as alcohol and disinfectants) and sharp objects. Therefore, the protective film must possess excellent chemical corrosion resistance, resisting the erosion of chemical reagents such as alcohol and acid/alkali solutions without dissolving or breaking. It must also possess high abrasion resistance (pencil hardness ≥3H) and impact resistance, resisting scratches from sharp objects and minor impacts to ensure the glass surface remains intact. Simultaneously, the protective film in the medical equipment field must be sterile, non-toxic, meet medical industry standards, and not release harmful substances.

In the fields of building curtain walls and outdoor advertising screens, AG anti-glare glass is exposed to the outdoor environment for extended periods, enduring the effects of wind, sun, rain, dust, and other factors. Therefore, the protective film must possess excellent weather resistance, resisting the erosion of wind, sun, and rain without aging, fading, or peeling. It must also possess good dustproof and waterproof properties, preventing dust and rainwater from entering the gaps between the protective film and the glass and contaminating the glass surface. Furthermore, it must have UV resistance to prevent the glass surface from aging and yellowing, extending its service life. In addition, the protective film used for building curtain walls must also possess certain light transmittance and appearance quality, without affecting the overall aesthetics of the building.

3.4 General Requirements for All Application Scenarios

Regardless of the application scenario, the protective film used in the application of AG anti-glare glass must meet the following general requirements: First, long-term protection, maintaining stable protective performance throughout the entire service life (usually 1-3 years) without aging, breakage, or peeling; second, compatibility, perfectly matching the surface structure of the AG anti-glare glass without affecting its anti-glare performance, light transmittance, or feel; third, ease of maintenance, the surface is not easily contaminated with dust or oil, easy to clean, and can be easily replaced when damaged; fourth, safety, with no sharp edges or volatile harmful substances, posing no harm to human health or the environment.

4 Existing problems and optimization suggestions for protective film for AG anti-glare glass

4.1 Existing main problems

Based on the current processing and application practice of AG anti-glare glass, the protective film still has the following problems in actual use: First, the adhesive matching degree is insufficient. Some protective films have too high adhesiveness, and it is easy to leave residual glue when peeling, which fills the uneven structure of the AG anti-glare glass surface and is difficult to clean, affecting the anti-glare performance and appearance; some protective films have too low adhesiveness, and are easy to fall off during processing or use, and cannot provide effective protection. Second, the environmental adaptability is insufficient. Some protective films are prone to shrinkage, deformation, yellowing and aging under high temperature, low temperature or ultraviolet radiation environment, shortening the service life, especially in vehicle and outdoor scenarios, this problem is more prominent[3]. Third, the material compatibility is poor. Some protective films react chemically with the coating material of AG anti-glare glass, resulting in coating peeling and discoloration, affecting the surface performance of the glass; some protective films have insufficient hardness and cannot effectively resist scratches and impacts. Fourth, there is an imbalance between cost and performance. The cost of some high-performance protective films is too high, making it difficult to meet the needs of large-scale production; the performance of some low-cost protective films is substandard, resulting in a decline in the processing qualification rate and product quality of AG anti-glare glass.

4.2 Optimization Suggestions In response to the above problems, and in combination with the processing technology and application requirements of AG anti-glare glass, the following optimization suggestions are proposed: First, optimize the adhesive formula. According to different processing links and application scenarios, develop protective films with different adhesive grades, use low-residue and easy-to-peel adhesive materials, and ensure that the adhesive is moderate, so that it can be tightly adhered and peeled off without residue. At the same time, an anti-residue coating can be added to the surface of the protective film to further improve the peeling performance [4]. Second, improve environmental adaptability. Select high-temperature resistant, low-temperature resistant, and UV-resistant high-quality substrates (such as PET, PI, etc.), optimize the coating process of the protective film, add anti-aging agents, UV absorbers and other additives to enhance the weather resistance and stability of the protective film, so that it can adapt to the environmental requirements of different scenarios [3]. Third, enhance material compatibility. Based on the coating materials and surface structure of AG anti-glare glass, develop a dedicated protective film to ensure no chemical reaction occurs between the protective film and the coating material. Simultaneously, improve the surface hardness and wear resistance of the protective film by selecting a substrate with a hardness ≥2H and adding a wear-resistant coating to enhance the protective effect. Fourth, balance cost and performance. Optimize the production process of the protective film to reduce the production cost of high-performance protective films. At the same time, strengthen quality control to improve the performance stability of low-cost protective films, and launch products with different cost-performance ratios to meet the needs of different fields. In addition, multifunctional composite protective films can be developed, integrating anti-glare, anti-fingerprint, anti-scratch, and UV protection functions to enhance the overall protective performance of the protective film and adapt to diverse application scenarios.

5. Conclusion and Outlook In the entire process of processing and applying AG anti-glare glass, the protective film, as a key protective carrier, directly affects the glass's processing qualification rate, surface quality, and service life. Considering the surface characteristics, processing technology, and application scenarios of AG anti-glare glass, the protective film must meet multiple requirements: During processing, it must possess properties such as chemical corrosion resistance, high temperature resistance, tight adhesion, and easy peeling, based on the process characteristics of different stages such as surface roughening, coating curing, and cutting, while also meeting cleanliness, dimensional stability, and environmental protection requirements. During application, it must possess properties such as light transmittance, abrasion resistance, weather resistance, and pollution resistance, based on the needs of different scenarios such as consumer electronics, automotive, and industrial control, while also meeting compatibility, ease of maintenance, and safety requirements. Currently, protective films for AG anti-glare glass still suffer from problems such as insufficient adhesion matching, poor environmental adaptability, poor material compatibility, and an imbalance between cost and performance. These issues need to be addressed by optimizing the adhesion formula, improving weather resistance, enhancing compatibility, and balancing cost and performance.

With the continuous expansion of the application fields of AG anti-glare glass, especially the rapid development of high-end consumer electronics, smart automotive, and new energy fields, the performance requirements for protective films will continue to increase. In the future, the development trend of protective films for AG anti-glare glass will mainly be reflected in three aspects: First, multi-functionality, integrating anti-glare, anti-fingerprint, anti-scratch, anti-ultraviolet, and anti-fog functions into one, improving comprehensive protection performance, and adapting to diversified scenario needs; Second, high-end, developing high-transmittance, high wear resistance, high weather resistance, and residue-free high-end protective films to meet the stringent requirements of high-end consumer electronics and automotive fields; Third, environmental protection, using biodegradable and non-volatile harmful materials, optimizing production processes, achieving green and environmentally friendly production, and conforming to national environmental protection policies and industry development trends. At the same time, with the continuous emergence of new materials and new processes, it is expected that more targeted and higher-performance special protective films will be developed, further promoting the high-quality development of the AG anti-glare glass industry and providing better products and solutions for various display and protection fields.