Sealing sheet for solar cell modules, solar cell module, and method for manufacturing the sealing sheet

Abstract

[Problem] To provide a sealing sheet for solar cell modules that has a desirable level of molding properties and heat resistance. [Solution] A sealing sheet for solar cell modules, wherein the base resin is a polyolefin resin, and the polyolefin resin is a linear low-density polyethylene resin composed of at least one selected from the group consisting of α-olefin with 4 carbon atoms, α-olefin with 6 carbon atoms, and α-olefin with 8 carbon atoms, the α-olefin content is 12 to 13 mol%, and the melt viscosity at a measurement temperature of 90°C is 3260 Pa·s or more and 3780 Pa·s or less. [Selected Figure] Figure 1

Claims

1. A sealing sheet for solar cell modules, Using polyolefin resin as the base resin, The aforementioned polyolefin resin is A linear low-density polyethylene resin composed of α-olefins having 4 carbon atoms and α-olefins having 6 carbon atoms, wherein the α-olefin content is 13 mol% and the melt viscosity at a measurement temperature of 90°C is 3260 Pa·s or more and 3550 Pa·s or less. Alternatively, a linear low-density polyethylene resin composed of α-olefins having 8 carbon atoms, wherein the α-olefin content is 12 mol%, and the melt viscosity at a measurement temperature of 90°C is 3340 Pa·s or more and 3780 Pa·s or less. Sealing sheet.

2. A solar cell module equipped with solar cell elements, The solar cell element comprises a front sealing layer and a back sealing layer, At least one of the front sealing layer and the back sealing layer is made of the sealing sheet described in claim 1. Solar cell module.

3. The gel fraction of the sealing material sheet is 50% or more and 90% or less. The solar cell module according to claim 2.

4. A method for manufacturing a encapsulant sheet for a solar cell module obtained by melt molding an encapsulant composition, The aforementioned sealing material composition contains a resin having a polyolefin resin as a base resin, and a crosslinking agent. The polyolefin resin is a linear low-density polyethylene resin composed of α-olefin with 4 carbon atoms and α-olefin with 6 carbon atoms, wherein the α-olefin content is 13 mol%, and the melt viscosity at a measurement temperature of 90°C is 3260 Pa·s or more and 3550 Pa·s or less. Alternatively, a linear low-density polyethylene resin composed of α-olefins having 8 carbon atoms, wherein the α-olefin content is 12 mol%, and the melt viscosity at a measurement temperature of 90°C is 3340 Pa·s or more and 3780 Pa·s or less. The content of the crosslinking agent is in the range of 0.2% by mass or more and 1.2% by mass or less of the total amount of the sealing material composition. The sealing material composition is melt-molded such that the resulting sealing material sheet has a melting point of 45°C or higher and 60°C or lower, and the temperature difference between the extracellular melting initiation temperature and the melting point is 11°C or less. A method for manufacturing sealing material sheets.

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