In view of excellent chemical stability and weather resistance of fluoropolymers,PVDF resin for solar backsheet film is becoming more and more popular.
Polyvinylidene fluoride (PVDF) is a semi-crystalline thermoplastic fluoropolymer. Its C-F bonds are characterized by short bond lengths and high bond energies, and the F atom has high electronegativity, readily forming hydrogen bonds between molecules. This allows it withstand corrosion from strong acids and alkalis, resist ultraviolet radiation, resist long-term aging, and easy to process. Meanwhile, PVDF resin does not contain hydrophilic groups, it is strongly hydrophobic, thus effectively isolating it from moisture.
PVDF backsheet film works as the important packaging material for solar cell modules.
As the picture shown, the outermost layer is fluoropolymer resin film with excellent weather resistance, good corrosion resistance, and can block moisture and resist ultraviolet aging. The middle layer is a PET polyester film with good insulation performance and ensures mechanical strength. The outer fluoropolymer film and PET film are bonded with adhesive. The inner film is bonded to EVA and then connected to the cell wafer.
In order to improve the overall performance of PVDF resin for solar backsheet film, it is often necessary to modify treatment on PVDF film so as to better meet the backsheet design and application requirements.
| No. | ITEM | UNIT | VALUE | |||
|---|---|---|---|---|---|---|
| A | B | C | D | |||
| 1 | Appearance | Pellet/Powder | ||||
| 2 | Melting Index | g/10min | 1.0-7.0 | 7.1-14.0 | 14.1-25.0 | ≥25.1 |
| 3 | Tensile Strength≥ | Mpa | 35 | |||
| 4 | Elongation≥ | % | 25 | |||
| 5 | Relative Density | / | 1.75-1.79 | |||
| 6 | Melting Point | ℃ | 165-175 | |||
| 7 | Thermal decomposition temperature≥ | ℃ | 380 | |||
| 8 | Hardness | Shore D | 70-80 | |||
Mainly used for PVDF products by injection, extrusion and other processing technology.
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