Solar module back sheet, and method for manufacturing same
AssigneeKolon Industries, Inc.
InventorsYun Jo Kim, Dong-Hyeon Choi, Si Min Kim
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Abstract
Provided are a polyester white film and a back sheet for a solar cell module using the same, and in particular, provided is a polyester white film having improved light reflectance.
Claims15
A polyester white film having a whiteness index of 100 or higher, reflectance of 90% or higher at 550 nm, MD thermal shrinkage of 2.0% or lower at 150° C. after 30 minutes, a color difference (ΔE) of 2.0 or less after irradiation of QUV (1.23 W/m2×340 nm×60° C.×99 hours), and MD elongation retention of 50% or higher at 121° C. and RH 100% after 50 hours.
A method for manufacturing a polyester white film, the method comprising:
- a) preparing a first master batch chip by mixing a polyester resin powder obtained by pulverizing a first polyester resin chip, rutile type titanium dioxide, and a benzoxazole based fluorescence whitening agent, followed by melt-extrusion at an extruder temperature of 240-265° C.;
- b) preparing an unstretched sheet by feeding the first master batch chip and a second polyester resin chip into an extruder, followed by melt-extrusion at a temperature of 280-320° C.;
- and
- c) preparing a film by uniaxially or biaxially stretching the unstretched sheet.
Dependencies are inferred from the claim text.