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Easily adhesive polyester film for solar cell back surface-protecting film and solar cell back surface-protecting film obtained using the same

A technology of solar cells and polyester films, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as insufficient effect and inability to use

Inactive Publication Date: 2007-10-31
TEIJIN DUPONT FILMS JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its effect is not sufficient, and it cannot be used especially when constructing a large-scale solar cell power generation system.

Method used

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  • Easily adhesive polyester film for solar cell back surface-protecting film and solar cell back surface-protecting film obtained using the same
  • Easily adhesive polyester film for solar cell back surface-protecting film and solar cell back surface-protecting film obtained using the same
  • Easily adhesive polyester film for solar cell back surface-protecting film and solar cell back surface-protecting film obtained using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7 and comparative example 1

[0154] Polyethylene terephthalate (intrinsic viscosity: 0.62) was melt-extruded onto a rotating cooling drum maintained at 20° C. to make an unstretched film. Next, after stretching to 3.3 times at 100° C. in the longitudinal direction, an aqueous coating liquid having a concentration of 8% by weight of the following composition for a coating film (Table 1) was uniformly applied to both sides by a roll coater. Next, the coated film was stretched further, dried at 95°C, stretched to 3.6 times in the transverse direction at 110°C, shrunk by 3% in the width direction at 220°C, and heat-set to obtain a thickness of 50 μm polyester film. In addition, the thickness of the coating film was 0.05 micrometers. These evaluation results are shown in Table 2.

[0155] Table 1

[0156]

[0157] Crosslinking agent A-1: ​​30 mol% of methyl methacrylate / 2-isopropenyl-2-oxazoline 30 mol% / polyethylene oxide (n=10) methacrylate 10 mol% / A polymer having an oxazoline group composed of 30 mo...

Embodiment 8

[0170] Polyethylene terephthalate (intrinsic viscosity: 0.62) containing 1% by weight of an ultraviolet absorber represented by the following formula was melt-extruded onto a rotating cooling drum maintained at 20° C. to form an unstretched film.

[0171]

[0172] Thereafter, a film was obtained in the same manner as in Example 3. Table 2 shows the evaluation results of the polyester film.

Embodiment 9

[0176] Polyethylene 2,6-naphthalate (intrinsic viscosity: 0.58) was melt-extruded onto a rotating cooling drum maintained at 60° C. to make an unstretched film. Next, after stretching to 3.3 times in the longitudinal direction at 140° C., the aqueous coating liquid used in Example 3 was uniformly applied to one surface with a roll coater. Next, the coated film was stretched, dried at 130°C, stretched to 3.6 times in the transverse direction at 150°C, shrunk by 3% in the width direction at 240°C, and heat-set to obtain a thickness 50μm polyester film. In addition, the thickness of the coating film was 0.05 micrometers. These evaluation results are shown in Table 2.

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Abstract

Disclosed is a highly adhesive polyester film which is used for protecting the back side of a solar cell and composed of a polyester film and a resin coating arranged on one side of the polyester film. This highly adhesive polyester film is characterized in that the resin coating is made of a crosslinking agent and a resin selected from polyester resins having a glass transition point of 20-100 DEG C, acrylic resins having a glass transition point of 20-100 DEG C, combinations of those resins, and combinations of at least one of those resins and a polyvinyl alcohol having a saponification degree of 70-90 mol%. This highly adhesive polyester film is excellent in adhesion to EVA while achieving excellent mechanical properties, heat resistance and moisture resistance.

Description

technical field [0001] The present invention relates to an easy-adhesive film and a solar cell back protection film. More specifically, it relates to a polyester film that exhibits excellent adhesion to ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVA) as a solar cell sealing resin by forming an easily-adhesive coating film containing a specific composition on at least one side of a polyester film. A composite easy-adhesive polyester film and a solar cell backside protective film using the same. Background technique [0002] In recent years, solar power generation systems have been gaining popularity as one of the means of generating electricity using non-polluting energy. The structure of the solar cell module is as described in Japanese Patent Application Laid-Open No. 6-38264. Generally speaking, it forms the following structure: between the glass substrate on the light-receiving side and the protective film on the back side, a plurality of plate-shaped s...

Claims

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Application Information

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IPC IPC(8): H01L31/048
CPCY02E10/50
Inventor 久保耕司
Owner TEIJIN DUPONT FILMS JAPAN
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