Low-melt-flow-index EVA composite white photovoltaic adhesive film

Abstract

The invention relates to the technical field of photovoltaic adhesive films, in particular to a low-melt-flow-index EVA composite white photovoltaic adhesive film, which comprises a lower white EVA layer and an upper transparent EVA layer, wherein the white EVA layer is prepared from the following ingredients in percentage by mass: 80 to 95 percent of low-melt-flow-index ethylene-vinyl acetate copolymer resin, 5 to 20 percent of white filling materials, 0.05 to 5 percent of antioxidants, 0.25 to 2 percent of cross-linking agents and 0.1 to 4 percent of silane coupling agents; the transparent EVA layer is prepared from the following ingredients in percentage by mass: 87 to 98 percent of low-melt-flow-index ethylene-vinyl acetate copolymer resin, 0.05 to 5 percent of antioxidants, 0.25 to 2percent of cross-linking agents and 0.1 to 4 percent of silane coupling agents. After the use of the structure, the low-melt-flow-index EVA composite white photovoltaic adhesive film provided by the invention has a wide application range; the reflection rate reaches 90 percent or higher; the photoelectric conversion efficiency of a photovoltaic assembly can be improved; phenomena of bubbles, invisible cracks, drapes and whitening can be eliminated at the same time.

Description

technical field [0001] The invention relates to the technical field of photovoltaic adhesive films, in particular to a low melting point EVA composite white photovoltaic adhesive film. Background technique [0002] In the past ten years, due to technological progress and low cost, my country's photovoltaic industry has developed very rapidly. Since 2008, its output and output value have surpassed Germany, Japan and other photovoltaic powerhouses to rank first in the world. However, at present, the photoelectric conversion effect of solar cells is difficult to improve, and has been maintained between 18% and 19%. How to improve the photoelectric conversion efficiency of photovoltaic cells has become the focus of the world's photovoltaic industry and an important reference for the government's new energy industry layout. The current photoelectric conversion efficiency is still far from the theoretically calculated power generation efficiency of 26.8% to 30%. The sources of the...

AI Technical Summary

Problems solved by technology

However, with the deepening of the research, the problems of bubbles, wrinkles and white overflow gradually emerged.

Photovoltaic modules require high-temperature lamination to be cured and formed, and in order to solve the generation of air bubbles in the lamination process, vacuuming is required. Under the dual effects of air pressure and internal stress, the white EVA film appears wrinkled, and it is easy to spill white onto the battery sheet and bus bars, which not only affects the appearance of photovoltaic modules, but also reduces the power

Images