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Readily bondable polyester film for solar cells

A solar cell, easy-adhesive technology, applied in polyurea/polyurethane coatings, circuits, adhesives, etc., can solve problems such as inability to obtain adhesiveness, and achieve good adhesion, firm adhesion, and heat and humidity resistance excellent effect

Inactive Publication Date: 2012-08-15
TOYO TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sufficient adhesiveness cannot be obtained for polyester films that have not been surface-treated, and improvement is required.

Method used

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  • Readily bondable polyester film for solar cells
  • Readily bondable polyester film for solar cells
  • Readily bondable polyester film for solar cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] (1) Preparation of coating liquid

[0193]

[0194] (Silicon-based, solid content concentration 100% by mass)

[0195] (2) Manufacture of easily-adhesive polyester film for solar cells

[0196]As a film raw material polymer, PET resin pellets (intrinsic viscosity: 0.62 dl / g) containing 0.03% by mass of silica particles with an average particle diameter of 2.5 μm were dried at 135° C. under a reduced pressure of 133 Pa for 6 hours. Then, it was supplied to an extruder and melted at about 285°C. The PET resins were respectively filtered through stainless steel sintered filter media (nominal filtration accuracy: 10 μm particle 95% cut), and melt extruded into a sheet shape. The unstretched PET sheet was obtained by rapid cooling and solidification on a rotary cooling metal roll maintained at a surface temperature of 30°C.

[0197] This unstretched PET sheet was heated to 100° C. by a heated roll set and an infrared heater, and then stretched 3.5 times in the longitud...

experiment example 1

[0200] Except having changed polyurethane resin into polyurethane resin (A-5), it carried out similarly to Example 1, and obtained the easily-adhesive polyester film for solar cells.

experiment example 2

[0202] Except having changed polyurethane resin into polyurethane resin (A-6), it carried out similarly to Example 1, and obtained the polyester film for solar cells.

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Abstract

Provided are: a readily bondable polyester film for solar cells which exhibits excellent adhesiveness; and a back sheet using the same. A polyester film which bears a coating layer on at least one surface thereof and which has a base sheet thickness of 20 to 500[mu]m, wherein the coating layer comprises, as the main component, a urethane resin containing an aliphatic polycarbonate polyol as a constituent component, and exhibits, in the infrared spectroscopy, a ratio of absorbance in the vicinity of 1460cm-1 to that in the vicinity of 1530cm-1 of 0.70 to 1.60, the former absorbance being assignable to the aliphatic polycarbonate component and the latter absorbance being assignable to the urethane component.

Description

technical field [0001] The present invention relates to an easily-adhesive polyester film for solar cells. Specifically, it is a polyester film excellent in adhesion to a sealant under high temperature and high humidity. Background technique [0002] In recent years, solar cells have been attracting attention as energy means to replace petroleum energy which is a cause of global warming. A solar cell is a photovoltaic power generation system that directly converts the energy of sunlight into electricity. As solar cell elements, semiconductors such as single crystal silicon, polycrystalline silicon, and amorphous silicon, compound-based or organic-based dyes, and the like are used. Generally, several to dozens of solar cell elements are wired in series or parallel, and various packages are performed to protect the elements for a long period of time (about 20 years or more). The unit assembled in this package is called a solar cell module. [0003] A solar cell module gene...

Claims

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Application Information

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IPC IPC(8): C08J7/04B32B27/36B32B27/40C09J7/02C09J175/04H01L31/042C08J7/043C08J7/048
CPCC08G18/44C08J2367/00C08J2475/08C09D175/06Y02E10/50C09J2203/322C09J2467/006C09J2475/00H01L31/049C09J7/35C09J7/22C08J7/0427C08J7/048C08J7/043C08L2666/20H02S10/30C09J7/29C09J7/255B32B27/36
Inventor 伊藤晃侍矢吹宽子森宪一
Owner TOYO TOYOBO CO LTD