Polyester film for protecting rear surface of solar cell

A back protective film and solar cell technology, which is applied in polyester coatings, circuits, photovoltaic power generation, etc., can solve the problems of insufficient hydrolysis resistance, reduced power generation performance of solar cell modules, and uneconomical problems, and achieve excellent resistance to detachment Laminarity, good protection function, and the effect of suppressing the reduction of mechanical properties

Inactive Publication Date: 2013-03-20
TEIJIN DUPONT FILMS JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the hydrolysis resistance of the white film is obtained only by increasing the molecular weight of the polymer as in Patent Document 9, a long polymerization time is required, which is not economical, and the obtained hydrolysis resistance cannot be said to be sufficient.
[0009] In addition, the white polyester film is more likely to delaminate inside the film than a transparent film that does not contain a colorant, and the solar cell element is affected by moisture, etc., resulting in a decrease in the power generation performance of the solar cell module.

Method used

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  • Polyester film for protecting rear surface of solar cell
  • Polyester film for protecting rear surface of solar cell
  • Polyester film for protecting rear surface of solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0157] Examples are given below to describe the present invention in detail. The evaluation method is as follows.

[0158] (1) Film thickness

[0159] The thickness of the film sample was measured at 10 locations with an electric micrometer (K-402B manufactured by Anritsu), and the average value was used as the thickness of the film.

[0160] (2) Intrinsic viscosity number (η)

[0161] The solution viscosity measured at a temperature of 35° C. after dissolving in a mixed solvent of phenol:tetrachloroethane at a weight ratio of 6:4 was used, and a value calculated by the following formula was used.

[0162] ηsp / C=[η]+K[η] 2 ?C

[0163] Among them, ηsp=(solution viscosity / solvent viscosity)-1, C is the dissolved polymer weight per 100ml of solvent (g / 100ml), and K is Huggins constant. In addition, the solution viscosity and the solvent viscosity were measured using an Ostwald viscometer. The unit is expressed in [dl / g].

[0164] (3) Weight average molecular weight

[0165]...

reference example 11）

[0237] (Reference Example 11) Production of polyethylene terephthalate (PET-n)

[0238] 85% by weight of the polymer (PET-b) obtained in Reference Example 2 and 15% by weight of aromatic polycarbodiimide "Stabaxol P100" manufactured by Lan Chemie Co., Ltd. were mixed, and supplied to a twin-screw kneader. Melting at ℃. The melt-kneaded polyester composition was formed into strands, discharged into water, and fragmented by a cutter. Call it PET-n.

Embodiment 1～3

[0240] Polyester raw materials were mixed in the compounding ratio shown in Table 1, dried at 180°C for 3 hours with a rotary vacuum dryer, supplied to an extruder, melted and extruded at 285°C, and molded by a slotted die into flaky. Further, the sheet was cooled and solidified with a cooling drum with a surface temperature of 20°C to obtain an unstretched film, which was stretched 3.4 times in the longitudinal direction (longitudinal direction) at 100°C, and cooled with a set of rolls at 25°C. Next, the longitudinally stretched film was introduced into a tenter while holding both ends of the longitudinally stretched film with clips, and stretched 3.7 times in the direction perpendicular to the length (transverse direction) in an atmosphere heated to 130°C. Then heat-fix in an atmosphere heated to 222°C for 15 seconds in a tenter, reduce the width by 4.0% in the lateral direction, then subtract both ends, and relax at a relaxation rate of 2.5% in the longitudinal direction T...

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Abstract

Disclosed is a polyester film that is for protecting the rear surface of a solar cell and that suppresses a decrease in mechanical properties during long-term use in a high-temperature, humid environment. Namely, the polyester film that is for protecting the rear surface of a solar cell and that contains a white polyester film layer comprising a polyester composition containing 85-96 mass% polyethylene terephthalate polymerized with an antimony compound and / or a titanium compound as a polycondensation catalyst and 4-15 mass% of a rutile titanium dioxide. With the number of moles of the entire dicarboxylic acid component that constitutes the polyethylene terephthalate as a benchmark, said polyethylene composition contains 10-40 millimole % of a particular phosphorus compound and, in terms of metal atoms, a total of 2-50 millimole % of antimony and / or titanium derived from the polycondensation catalyst. The initial delamination strength of said polyester film for protecting the rear surface of a solar cell is at least 6 N / 15 mm, and the elongation retention rate before and after aging for 3000 hours in a 85 DEG C, 85% RH environment is at least 50%.

Description

technical field [0001] The present invention relates to a white polyester film for a solar cell back surface protection film excellent in environmental resistance. In detail, it relates to a white solar cell back protection film that can suppress the decrease in mechanical properties when used for a long time in a high-temperature or high-humidity environment, has excellent delamination resistance, and can maintain a good protective function even after long-term use polyester film. Background technique [0002] In recent years, a photovoltaic power generation system using a solar cell module has become popular as one of power generation systems utilizing clean energy. The structure of a solar cell module is, for example, as described in Japanese Patent Application Laid-Open No. 2007-129014 (Patent Document 1). Generally, a transparent front substrate on the light-receiving side, a filling material, a solar cell element, a filling material, and a solar cell backside are prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/042C08G63/85C08J5/18
CPCC08K5/5313Y02E10/52C08K3/22C08J5/18B32B27/20C08K5/5317C08J2367/02C09D167/02H01L31/0487B32B27/36Y02E10/50B32B2307/402H01L31/049Y10T428/24975C08L67/03H01L31/042
Inventor 松村直子清水智子小山松淳
Owner TEIJIN DUPONT FILMS JAPAN
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