Low-End Carboxyl Film-grade PET Chip for PV Backsheet And Antiblock Agent
Stable Thermal Film Grade PET Polymer for Photovoltaic Panels BOPET
Film-grade PET Chip enjoys the characteristics of good thermal stability, high cleanliness, and excellent film-forming properties. It is mainly used to produce PET back sheets in PV or solar modules, BOPET film, packaging film, printing film, protective film, plastic wrap, high transparent film, tape film, etc.
1. PET Film for PV Backsheet
A back sheet is a polymeric cover of a photovoltaic (PV) module and is designed to protect the inner components. It is very essential for the solar panel to have a back sheet of high quality, which withstands various environmental elements for many years. Polyethylene terephthalate (PET) is an important material and mainly acts as the core and outer layer of back sheets. These layers provide mechanical stability and electrical isolation. Our film-grade PET Chips can produce such a PET layer.
2. Anti-block Agent for Plastic
Blocking in polymer films refers to the adhesion of two polymer surfaces to one another, resulting in difficulty in separating the films. An anti-blocking agent can help reduce blocking at the surface of polymer films and other plastic articles to allow easier processing and handling.
3. BOPET Film
BOPET Film is made from film-grade PET chips through processes, such as drying, melt extrusion, casting, biaxial stretching orientation, drawing, and winding.
The intrinsic viscosity mainly affects the strength of the film. When the viscosity reaches a certain value, the strength will no longer rise. Generally speaking, the IV value of film grade PET granule is (0.62-0.68) ± 0.01dl/g. When film with higher strength is required, PET with a higher IV value should be used.
The melting point indirectly reflects the DEG (diethylene glycol) content, molecular weight distribution, and oligomer content of PET resin. When the melting point is low, the resin has poor heat resistance.
The b value of polyester chips directly affects the color of the film. The measurement is based on the principle of chromatography and photometry and related international standards. And it is tested by a color difference meter using the Hunter (L-whiteness, a-green/red index, b-yellow index) method.
The high content of DEG (diethylene glycol) will affect the heat resistance and light resistance of PET. But because the ether bond in DEG has a certain degree of flexibility, its existence reduces the rigidity of the PET molecule and lowers the melting point of PET. It also reduces the crystallization rate of PET, which is conducive to film pulling.
The content of the terminal carboxyl group (-COOH) not only affects the film drawing performance of chips but also affects the performance of the film. If the content of end groups is too high, it is easy to cause the degradation of the melt and cause the film to break when being stretched.
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