Back sheet for a solar cell module, and solar cell module comprising same

[0104]10 parts by weight of titanium dioxide (TiO2) having an average particle size of 3 μm was mixed with 100 parts by weight of polyethylene (PE). The mixture was prepared into a 150-μm thick white PE film (hereinafter, referred to as ‘W-PE film’) through biaxial stretching.

[0105]After forming anticorrosion layers on both surfaces of a 80-μm thick aluminum (Al) film, the W-PE film (PE+TiO2) prepared above was attached on surface thereof using an acryl-based adhesive to prepare a back sheet having a stacked structure of W-PE film / anticorrosion layer / Al film / anticorrosion layer. The anticorrosion layer was formed by treating the both surfaces of the aluminum (Al) film with chromic acid to a thickness of about 1 μm.

[0106]A back sheet was prepared in the same manner as in Example 1, except for further forming a fluorine coating layer.

[0107]Specifically, a back sheet having a stacked structure of W-PE film / anticorrosion layer / Al film / anticorrosion layer / fluorine coating layer was prepared by gravure-coating and hardening a fluorine resin composition obtained by mixing PTFE and ethanol at 1:1 (weight ratio) on an anticorrosion layer with no W-PE film (PE+TiO2) attached to a thickness of 20 μm.

[0108]A back sheet was prepared in the same manner as in Example 1, except for further forming a heat-dissipating ink coating layer. Specifically, a back sheet having a stacked structure of W-PE film / anticorrosion layer / Al film / anticorrosion layer / heat-dissipating ink coating layer was prepared by gravure-coating and hardening a liquid ink composition including an acryl resin and a graphite powder at a weight ratio of 1:1 on an anticorrosion layer to a thickness of 25 μm.