High-barrier-property photovoltaic backboard of multilayer structure

Abstract

The invention discloses a high-barrier-property photovoltaic backboard of a multilayer structure. The photovoltaic backboard sequentially comprises a weather-proof outer layer, a first obstruction coating, a first base layer, a second obstruction coating, a second base layer, a third obstruction coating and an inner layer from top to bottom. The first obstruction coating, the second obstruction coating and the third obstruction coating are all double-component polyurethane systems. A component A is prepared from 15-25 parts of fluorine resin, 20-40 parts of polypropylene oxide polyhydric alcohols, 1-2 parts of defoaming agent, 0.5-1 part of catalyst, 5-10 parts of inorganic filler and 10-30 parts of organic solvent. A component B is a mixture containing one or two of toluene diisocynate, isophorone diisocyanate and trimethyl 1,6-hexamethylene diisocyanate. The component A and the component B are mixed according to the ratio NCO / OH=0.5-1.1. According to the high-barrier-property photovoltaic backboard, by designing the two base layers and the three obstruction coatings, the moisture barrier property and the insulativity of the backboard are effectively improved.

Description

technical field [0001] The invention relates to a backboard of a photovoltaic module, in particular to a photovoltaic backplane with a high barrier property multilayer structure. Background technique [0002] Photovoltaic backsheet is an extremely important packaging material in photovoltaic modules, which plays a supporting role for the cells. At the same time, it directly contacts with the external environment in a large area, and undertakes the important mission of ensuring the stable power generation of photovoltaic modules for 25 years. Excellent insulation, barrier Durability and weather resistance are the reliability guarantees for its long-term application. [0003] Traditional photovoltaic backsheets such as TPT and KPK are general-purpose backsheets. The middle base layer is polyester film, and the inner and outer layers are fluoropolymer films (PVF film, PVDF film, etc.), which have excellent insulation properties and weather resistance. (UV resistance, heat and ...

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Problems solved by technology

[0003] Traditional photovoltaic backsheets such as TPT and KPK are general-purpose backsheets. The middle base layer is polyester film, and the inner and outer layers are fluoropolymer films (PVF film, PVDF film, etc.), which have excellent insulation properties and weather resistance. (UV resistance, heat and humidity resistance), but the overall barrier properties of the backsheet, the adhesion to the EVA film and the thermal conductivity are insufficient, which cannot fully meet the changing climate conditions, and are used under some harsh environmental conditions There will also be failure phenomena of delamination, pulverization, and yellowing

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