What are the application characteristics of solar double glass adhesive tape?
Solar double-glass adhesive tape is a special adhesive product for photovoltaic double-glass module packaging. Its core is adapted to the glass-glass packaging structure of double-glass module, which replaces some traditional application scenarios of silica gel. It has the characteristics of adhesive sealing, weather resistance, aging resistance, insulation and flame retardant, and meets the outdoor use requirements of photovoltaic modules for more than 25 years. Its application characteristics are centered on the three cores of photovoltaic industry, namely, packaging technology, outdoor working conditions and module reliability, and are specifically divided into three core performance characteristics, process application characteristics and scene adaptation characteristics.
First, the core performance characteristics: adapt to the harsh outdoor conditions of photovoltaic, and meet the long-term reliability.
Solar double glass tape is a modified acrylic foam tape/butyl rubber tape (mainstream model), which is designed for the complicated working conditions of photovoltaic modules such as outdoor high and low temperature, ultraviolet light, wind and rain, high and low humidity, and its performance index completely matches the photovoltaic industry standards (such as GB/T 2951 and IEC 61730), which is its core application advantage:
High adhesion and long-lasting stability.
It has the characteristics of high initial adhesion and long-lasting adhesion to photovoltaic ultra-white tempered glass, and the peeling strength is more than or equal to ≥10N/25mm. After bonding, it has no degumming and glue opening, which can resist the stress and deformation of double-glass components due to outdoor thermal expansion and contraction, ensure the bonding tightness between glass and glass, and does not react chemically with glass, photovoltaic backboard and other component materials.
All-weather weather resistance, suitable for all outdoor scenes.
It can withstand **-40℃~125℃** high and low temperature cycles (covering extreme areas such as the north and south poles and deserts), resist ultraviolet aging (no performance degradation over 3000 h of UV), resist water and damp heat (no debonding after 1000h of damp heat test at 85℃/85% RH), and meet the requirements of photovoltaic modules for long-term outdoor use.
Excellent sealing, waterproof and gas barrier.
The adhesive tape is of closed-cell foam/butyl rubber structure, which has no pores and good air tightness. It can effectively block water vapor and air from entering the inside of the double-glass module, prevent the oxidation corrosion of battery cells and welding strips inside the module, avoid the degradation of the insulation performance of the module caused by the infiltration of rain and dew, and improve the IP protection level of the module (up to IP67 and above).
Electrical insulation and flame retardancy, in line with photovoltaic safety standards.
The volume resistivity is more than or equal to ≥10¹⁴Ω・cm, and the dielectric strength is more than or equal to 20 kV/mm. It has excellent electrical insulation performance and can avoid the formation of leakage channels between the internal circuit of the double glass module and the glass shell. The flame retardant grade reaches UL94 V-0, and it does not spread or drip when exposed to open fire, which meets the fire safety requirements of photovoltaic modules and adapts to the fire protection specifications of photovoltaic power plants.
Buffer and shock absorption to offset the stress of thermal expansion and cold contraction of components
The adhesive tape itself is an elastic foam structure, which has a certain compression resilience (resilience is more than or equal to 90% after being compressed by 50%), which can offset the thermal expansion and cold contraction stress of the double-glass module caused by outdoor temperature difference between day and night and seasonal temperature difference, avoid the cracking and edge collapse of the glass caused by hard contact stress, and protect the structural integrity of the module.
Solvent-free, environment-friendly and pollution-free, and suitable for photovoltaic production process.
During the production and use, there is no VOC release and solvent leakage, which will not pollute the surface of photovoltaic glass, and will not react with EVA/POE film, battery sheet and other materials inside the module. It meets the environmental protection standards such as RoHS and REACH, and meets the green production requirements of photovoltaic modules.
Second, the characteristics of process application: it adapts to the automatic production of double glass components and improves the packaging efficiency.
The design of solar double-glass adhesive tape fits the large-scale and automatic production process of photovoltaic modules. Compared with traditional silicone packaging, it greatly simplifies the process, improves the production efficiency, and reduces the difficulty of process control. It is an important choice for photovoltaic module manufacturers to reduce costs and increase efficiency.
Automatic sizing, suitable for high-speed production line.
The adhesive tape is in the structure of coiled release paper, which can be matched with the automatic gluing machine of photovoltaic module production line to realize the accurate and automatic gluing of glass frames and junction boxes. The gluing speed can reach more than 10m/min, which is much higher than the manual/semi-automatic gluing efficiency of silica gel, and it is suitable for large-scale production of double-glass modules.
Instant bonding and positioning, no curing time, shortening production cycle.
Curing is not required after attaching, and effective bonding and positioning are realized immediately after pressing. After attaching, the double glass module can directly enter the subsequent lamination and lamination process, without waiting for 24-48h curing time like silica gel, which greatly shortens the production cycle of photovoltaic modules and improves the productivity of production lines.
The thickness of the adhesive layer is even, and there is no problem of overflow or lack of adhesive.
The adhesive tape has a fixed thickness structure (usually 0.5~3mm in thickness), and the thickness of the adhesive layer is uniform after being attached. There will be no problems such as glue overflow (polluting glass/battery chip), glue shortage (lax sealing), uneven glue line, etc. when silicone glue is applied, which will reduce process rework and improve the package yield of components.
Convenient construction, no need for professional gluing technology, reducing labor costs.
When gluing manually, only the release paper needs to be torn off, and after gluing, the bonding can be realized by light pressure, which does not require workers to have professional gluing techniques like silica gel, and has low requirements on the skills of operators, which can reduce the cost of manual training and reduce the errors of manual operation.
Can be customized by die cutting, and can be adapted to the special-shaped structure of double glass components.
Precise die cutting can be carried out according to the frame size, junction box opening, junction box position, etc. of photovoltaic double-glass modules, and customized shaped adhesive tapes (such as rings, strips, and shaped parts) can be made, which can be directly attached without field cutting, and can be adapted to double-glass modules with different specifications and structures, thus improving process adaptability.
Third, the scene adaptation characteristics: matching the packaging requirements of double glass components, replacing and complementing traditional silica gel.
Solar double-glass adhesive tape is not a complete substitute for silica gel, but a targeted adaptation to the core packaging scene of double-glass components, which is complementary to silica gel. It is mainly used in the sealing of the inner side of the frame of double-glass components, the bonding sealing of junction boxes/confluence boxes, the sealing of local glass splicing, etc., with strong adaptability and obvious advantages:
Core application scenario: inner ring seal of double glass component frame
This is its main application scene. It is attached to the inner glass surface of the outer frame of the double glass module, and cooperates with the aluminum alloy frame to form a double sealing structure of "adhesive tape+frame", which replaces the traditional inner sealing of silica gel, and the sealing effect is more stable, and it is avoided that silica gel overflows to pollute the glass surface and affect the appearance of the module.
Secondary application scenario: bonding and sealing of junction box/junction box
It is used for bonding and sealing the junction box and the junction box on the back of the double-glass module with glass, and has the dual functions of bonding and fixing and waterproof sealing. Compared with silica gel, the bonded junction box has no risk of displacement and the sealing layer has no gap, which can effectively prevent water vapor from infiltrating into the module from the junction box.
Supplementary application scenario: local splicing/sealing repair of double glass components
Aiming at the local splicing of glass in the production process of double-glass components, the repair of packaging defects, or the local sealing repair of power station field components, it can be quickly attached to realize sealing, and it is not necessary to glue on the spot and wait for curing, so as to meet the emergency sealing requirements of production and power station field.
Adapting thin/lightweight double glass module
The adhesive tape itself is light in weight and thin in thickness, which will not increase the overall weight and thickness of the double-glass module, and is in line with the current development trend of thin, light and large-size photovoltaic modules, and is suitable for distributed photovoltaic, rooftop photovoltaic and other scenes that require the weight/size of the module.
Fourth, the core application difference (advantage comparison) with the traditional silica gel package.
Compared with traditional silicone rubber, solar double-glass adhesive tape has obvious advantages in production efficiency, process control and sealing stability. The core application differences between the two are as follows, which is also the key to become the mainstream packaging material of photovoltaic double-glass modules:
Contrast dimension solar double glass tape traditional silicone rubber
Automatic gluing with high production efficiency, no curing time, high efficiency, slow gluing, 24-48h curing and long period.
The process control has no glue overflow at constant thickness, high yield, low requirement for manpower, easy glue overflow/lack, high requirement for gluing technique and high rework rate.
Closed-cell structure with sealing stability, good weather resistance, long-term aging-free degumming, easy to be affected by temperature and humidity, and easy to powder, crack and degum outdoors for a long time.
The component protects elastic buffer, counteracts thermal expansion and cold contraction stress, prevents glass from cracking and hardening, has no buffer, and is easy to cause glass cracking due to stress.
The field application can be quickly attached on the spot, and the field gluing needs to be cured, and the repair cycle is long.
V. Precautions in application: Fit the photovoltaic production process to ensure the bonding and sealing effect.
Cleaning of bonding surface: The bonding surface of photovoltaic glass should be free of oil, dust and water stains, otherwise the bonding force will be greatly reduced. Plasma cleaning/dust-free wiping should be carried out on the glass surface during production to ensure the surface cleanliness.
Pressing in place: after gluing, use a special pressure roller (pressure 0.3~0.5MPa) to press evenly, so as to ensure that the adhesive tape is completely attached to the glass surface, and there is no air bubble or edge warping, which will lead to sealing failure and water vapor infiltration.
Storage and use environment: the adhesive tape should be stored at normal temperature (about 25℃), in a dry and dark environment, and the shelf life is generally 12 months; The gluing operation environment should be dust-free and free of condensation, and the ambient temperature should be ≥10℃ to avoid the decrease of initial adhesion caused by low-temperature gluing.
Matching glass thickness: according to the glass thickness and frame gap of the double-glass assembly, choose the tape with appropriate thickness to ensure that the tape is moderately compressed (compression rate is 30%~50%). Insufficient compression will lead to lax sealing, and excessive compression will lead to the loss of cushioning performance of the tape.
summary
The core application characteristics of solar double-glass adhesive tape are * * "Performance adapts to harsh outdoor conditions, process adapts to automatic production, and scene adapts to double-glass module packaging", which not only meets the long-term reliability requirements of photovoltaic modules for 25 years, but also improves the production efficiency of module packaging and reduces the difficulty of process control. It is a special preferred material for photovoltaic double-glass module packaging. It is complementary to the traditional silica gel, and is mainly used in core scenes such as sealing the inner side of the frame and bonding and sealing the junction box. It has become the mainstream gluing scheme for large-scale production of photovoltaic modules, which is in line with the development trend of high efficiency, reliability and cost reduction in photovoltaic industry.
