PET (Polyethylene Terephthalate) film for solar cell backboard and preparation method of PET film

Abstract

The invention discloses a PET film for a solar cell backboard, the PET film comprises a middle PET base film, a first functional film layer and a second functional film layer, the first functional film layer and the second functional film layer are respectively arranged on the upper surface and the lower surface of the PET base film, and the first functional film layer and / or the second functional film layer are / is modified PET film layers. The modified PET film layer is prepared from polyhedral oligomeric silsesquioxane modified PET resin, an accelerant, a modified inorganic filler, an additive and a nucleating agent. The PET film for the solar cell backboard is good in overall consistency and not prone to cracking, the film layer of the PET film has the excellent performance of high temperature resistance, weather resistance, aging resistance and the like, and the requirement for the long-term service life in the severe environment is met.

Description

technical field [0001] The invention relates to the technical field of photovoltaics, in particular to a PET film for a solar battery back plate and a preparation method thereof. Background technique [0002] Backsheet is a photovoltaic encapsulation material used on the back of solar modules and directly in contact with the external environment on a large area. It should have excellent long-term aging resistance (humid heat, dry heat, ultraviolet), electrical insulation resistance, water vapor barrier and other properties . Therefore, the back film must meet the 25-year environmental test of solar cell modules in terms of aging resistance, insulation resistance, and water vapor resistance, and play the role of packaging raw and auxiliary materials of modules, protecting solar modules, and isolating busbars. [0003] There are many classifications of photovoltaic backsheets, the most commonly used are two types, that is, coating type and composite type according to the manu...

AI Technical Summary

Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the present invention provides a PET film for solar battery backplanes to solve the defects of the existing solar battery backplane film, such as poor overall consistency and easy cracking, and its high and low temperature resistance. , weather resistance, aging resistance and other performance problems, so as to further make it meet the life requirements of long-term use in harsh environments

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