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Polyester film, laminated film, and solar-cell back sheet and solar cell both including same

A technology for solar cells and polyester films, applied in the field of polyester films, can solve problems such as hydrolysis deterioration and reduced heat and humidity resistance, and achieve the effects of high durability, excellent time-dependent high heat and humidity resistance

Active Publication Date: 2014-11-19
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in order to make polyester films, especially polyester films mainly composed of ethylene terephthalate units, highly functional, when mixing other components (such as ultraviolet absorbers, inorganic particles, etc.), mixing Deterioration occurs due to hydrolysis during kneading, and the obtained film exhibits the functions of the added components, but there is a problem that the heat and humidity resistance decreases.

Method used

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  • Polyester film, laminated film, and solar-cell back sheet and solar cell both including same
  • Polyester film, laminated film, and solar-cell back sheet and solar cell both including same
  • Polyester film, laminated film, and solar-cell back sheet and solar cell both including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] Using 100 mol% of terephthalic acid as a dicarboxylic acid component, using 100 mol% of ethylene glycol as a glycol component, and using magnesium acetate, antimony trioxide, and phosphorous acid as a catalyst, the polycondensation reaction proceeds. Then, the obtained polyethylene terephthalate was dried at 160°C for 6 hours to crystallize it, and then solid-phase polymerization was carried out at 220°C and a vacuum degree of 0.3 Torr for 9 hours to obtain a poly(ethylene terephthalate) with a melting point of 255°C. Ethylene terephthalate (PET) (crystalline polyester resin A). Next, 95 mol% terephthalic acid and 5 mol% isophthalic acid are used as the dicarboxylic acid component, 100 mol% cyclohexanedimethanol is used as the glycol component, and magnesium acetate, antimony trioxide, and phosphorous acid are used as the catalyst. The polycondensation reaction gave polycyclohexanedimethanol terephthalate (PCT / I5 mol%) (crystalline polyester resin B) containing 5 mol% of...

Embodiment 2～5、21、22

[0194] A biaxially stretched film was obtained in the same manner as in Example 1, except that the stretching ratio was changed as shown in Table 1 in the film manufacturing process. The obtained film was evaluated as follows: flatness of the dispersed phase of crystalline polyester resin B, ratio of titanium oxide particles in or in contact with the dispersed phase of crystalline polyester resin B, average relative reflectance, after humidity and heat resistance test Evaluation of the mechanical properties and mechanical properties after the light resistance test. As a result, as shown in Table 1, it is a film with good moisture and heat resistance, light resistance, and light reflectivity. Furthermore, it can be seen that the higher flatness of the crystalline polyester resin B is a film with better moisture and heat resistance. In addition, using the above-mentioned film, a solar cell back sheet was produced in the same manner as in Example 1, and the humidity resistance and...

Embodiment 6

[0196] Use 92 mol% terephthalic acid and 8 mol% isophthalic acid as the dicarboxylic acid component, use 100 mol% cyclohexanedimethanol as the glycol component, and use magnesium acetate, antimony trioxide, and phosphorous acid as a catalyst to perform the polycondensation reaction. Polycyclohexanedimethanol terephthalate (PCT / I 8 mol%) containing 8 mol% isophthalic acid with a melting point of 270°C was used as the crystalline polyester resin B, except that it was the same as in Example 1 Get the film. The resulting film was evaluated as follows: the flatness of the dispersed phase of the crystalline polyester resin B, the proportion of titanium oxide particles in or in contact with the dispersed phase of the crystalline polyester resin B, the average relative reflectivity, and the resistance after the heat and humidity test Evaluation of mechanical properties and mechanical properties after light resistance test. As a result, as shown in Table 1, it was a film with good mois...

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Abstract

The invention is to provide a polyester film excellent in moist heat resistance and other characteristics (ultraviolet ray resistance, light reflecting characteristic, etc.), and to provide a solar battery backsheet excellent in moist heat resistance and ultraviolet ray resistance by using the polyester film. It is also a task to provide a highly durable solar battery by using the solar battery backsheet. The polyester film is a polyester film containing particles and two kinds of crystalline polyester resins in which a sea-island structure is formed, and being characterized in that if a crystallization temperature of a crystalline polyester resin that forms a continuous phase (also referred to as matrix phase) (hereinafter, referred to as crystalline polyester resin A) is represented by TccA and a crystallization temperature of a crystalline polyester resin that forms a dispersion phase (also referred to as domain phase) (hereinafter, referred to as crystalline polyester resin B) is represented by TccB, an expression (1) below is satisfied, and that a degree of flatness of the dispersion phase is 3 or more, and that 70% or more of a total number of the particles are present in the dispersion phase or are in contact with the dispersion phase. TccA - TccB ‰¥ 5 �¢ °C

Description

Technical field [0001] The present invention relates to a polyester film that can be particularly preferably used as a solar cell back sheet, and also relates to a solar cell back sheet and solar cell using the film. Background technique [0002] Polyester (especially polyethylene terephthalate, polyethylene 2,6-naphthalate, etc.) resins are excellent in mechanical properties, thermal properties, chemical resistance, electrical properties, and moldability , Used for multiple purposes. The polyester resin is formed into a film to obtain a polyester film. The biaxially oriented polyester film can be used as a copper-clad laminate, solar battery backsheet, tape, and flexible printing in terms of its mechanical and electrical properties. Various electrical insulating materials such as substrates, membrane switches, planar heating elements, or flat cables, magnetic recording materials, capacitor materials, packaging materials, automotive materials, construction materials, photography...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18B32B27/36H01L31/049
CPCY02E10/52C08J5/18C08J2367/02H01L31/0481H01L31/0487B32B9/00B32B2307/412H01L31/049Y02E10/50Y10T428/254Y10T428/249921B32B27/36C08L67/02
Inventor 青山滋岛津绫子盐见笃史高桥弘造
Owner TORAY IND INC