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Polyester Film, Process For Producing Same, Back-Protective Sheet For Solar Cell, And Solar Cell Module

A technology of solar cells and polyester films, applied in circuits, photovoltaic power generation, electrical components, etc., to achieve the effect of excellent thickness uniformity and excellent long-term durability

Active Publication Date: 2017-12-01
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the polyester film is colored white, the film usually contains white particles such as titanium oxide

Method used

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  • Polyester Film, Process For Producing Same, Back-Protective Sheet For Solar Cell, And Solar Cell Module
  • Polyester Film, Process For Producing Same, Back-Protective Sheet For Solar Cell, And Solar Cell Module
  • Polyester Film, Process For Producing Same, Back-Protective Sheet For Solar Cell, And Solar Cell Module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0325]

[0326] -Synthesis of polyester-

[0327] In a slurry prepared by mixing 100 kg of high-purity terephthalic acid (manufactured by Mitsui Chemicals, Inc.) and 45 kg of ethylene glycol (manufactured by Nippon Shokubai Co., Ltd.), bis(hydroxyethyl)terephthalic acid was charged in advance. Formate is about 123kg, which is supplied sequentially over 4 hours to maintain a temperature of 250°C and a pressure of 1.2×10 5 Pa's esterification tank. After the end of supply, esterification reaction was further carried out over 1 hour. Then, 123 kg of the obtained esterification reaction product was moved to the polycondensation reaction tank.

[0328] Next, 0.3 mass % of ethylene glycol was added to the obtained polymer in the polycondensation reaction tank which transferred the esterification reaction product. After stirring for 5 minutes, ethylene glycol solutions of cobalt acetate and manganese acetate were added to the polycondensation reaction tank so that the cobalt ato...

Embodiment 2～5、 Embodiment 8

[0419] (Examples 2-5, Example 8, Comparative Examples 1-3)

[0420] In Example 1, the PET pellet 1 was replaced by any one of the following PET pellets 2 to 3 or PEN pellets, and the production conditions of the white polyester film were changed as shown in Table 2. In the same manner as in Example 1, a biaxially stretched polyethylene terephthalate film was produced and evaluated. The evaluation results are shown in Table 3.

[0421] -Preparation of PET particles 2~3 and PEN particles-

[0422] (1) Preparation of PET particles 2

[0423] In the production of PET pellet 1, PET pellet 2 was produced in the same manner as in the production of PET pellet 1, except that the temperature and time of the solid-phase polymerization reaction were changed from 220°C for 30 hours to 230°C for 60 hours. .

[0424] (2) Preparation of PET particles 3

[0425] In the production of PET pellet 1, PET pellet 3 was produced in the same manner as in the production of PET pellet 1, except tha...

Embodiment 6

[0428] (Example 6, Comparative Example 4)

[0429] In Example 1, the amount of titanium oxide was changed, and the production conditions of the white polyester film were changed as shown in Table 2, except that, in the same manner as in Example 1, biaxially stretched polyterephthalic acid was produced. Glycol ester films were evaluated. The evaluation results are shown in Table 3.

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Abstract

The present invention provides: a polyester film which contains white particles and satisfies relationships 1 and 2 and in which when two or more areas located along the width direction perpendicular to the lengthwise direction are each examined for 10I+T, then the width of variations, which is represented by the absolute value of the difference between the maximum and minimum of the values of 10I+T, is 2.0 or less; a process for producing the polyester film; a back-protective sheet for solar cells; and a solar cell module. (2 mass%)<=T<=(20 mass%) relationship 1 (0.6 dL / g)<=I<=(0.8 dL / g) relationship 2 In the relationships, T indicates the content of the white particles relative to the mass of the film per unit volume, and I indicates the intrinsic viscosity of the area where T was determined.

Description

technical field [0001] The present disclosure relates to a polyester film, a method for producing the same, a back protection sheet for solar cells, and a solar cell module. Background technique [0002] Polyester films are widely used as various optical films from the viewpoint of being excellent in strength, dimensional stability, and chemical resistance, and the use of colored polyester films is also expanding depending on applications. For example, in recent years, a white polyester film colored white has been used as a support for a back surface protection sheet (so-called back sheet) arranged on the back surface of a solar cell module with the aim of improving power generation efficiency. [0003] In order to make a polyester film suitable for a back sheet, not only durability against heat and light, but also various properties according to the application are required. Specifically, for example, when an adjacent layer is coated on a polyester film, it is required tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/14B29C47/86C08J5/18C08L67/02H01L31/049B29C48/08B29C48/305
CPCC08J5/18C08L67/02H01L31/049Y02E10/50B29C48/305B29C48/86B29C48/08C08K3/22
Inventor 中居真一
Owner FUJIFILM CORP