EVA, PVB, POE, which one is better in laminated glass applications?
1. Optical properties:
PVB interlayer has an advantage in areas with extremely high clarity requirements such as automobile windshields due to its extremely high transparency and good optical uniformity, and can provide drivers with a clear view. POE interlayer also has excellent light transmittance and low haze, which makes the glass present a transparent and clean visual effect. It is often used in high-end architectural glass. Although EVA interlayer is slightly inferior to the first two in light transmittance, it can also meet the needs of most conventional buildings and photovoltaic modules, and its surface is not prone to rainbow patterns, and the visual perception is good.
2. Adhesion performance
PVB has a strong adhesion to glass, especially after high temperature and high pressure treatment, which can make the glass and the interlayer tightly bonded. Even if the glass is broken, the fragments will adhere firmly to PVB, which is extremely safe. Therefore, it is widely used in automotive glass and building curtain walls with strict safety requirements. POE interlayer also has excellent bonding performance and good adhesion to a variety of materials. In photovoltaic module packaging, it can effectively protect the battery cells and improve the reliability of the module. EVA interlayer has a fast bonding speed and can achieve good bonding effect at room temperature or lower temperature. The operation is relatively simple, but its bonding performance may be affected to a certain extent in a long-term humid environment.
3. Usage method
There are differences between the three materials. PVB interlayer usually needs to be laminated for a long time (about 60 minutes) under high temperature (130℃ - 150℃) and high pressure (10 - 15 atmospheres) to ensure sufficient bonding. It has high requirements on equipment and a long production cycle. POE interlayer is also suitable for high temperature and high pressure lamination process, but in some special processes, vacuum hot pressing and other methods can also be used. The processing conditions of EVA interlayer are relatively loose. It can be bonded after 30 - 60 minutes of lamination at 120℃ - 140℃ and 10 - 15 atmospheres. The production efficiency is higher and energy consumption can be reduced.
4. Environmental protection perspective: EVA interlayer has the advantage of being recyclable. After being discarded, it can be recycled by physical or chemical methods to make recycled materials. POE interlayer also has good recyclability and is environmentally friendly. However, PVB interlayer is slightly inferior in environmental protection due to the difficulty of recycling.
In general, PVB has excellent optical and bonding properties, and is particularly suitable for fields with high requirements for safety and clarity, but its processing is complex and costly; POE has balanced performance and has obvious advantages in the photovoltaic and high-end construction fields; EVA is superior in terms of easy processing, low cost, and good environmental protection, and is suitable for projects that are sensitive to cost and efficiency. In actual applications, it is necessary to weigh and select according to specific needs to maximize the value of the material.
