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Method for producing polyester film, polyester film, back sheet for solar cell, and solar cell module

A manufacturing method and polyester film technology, applied in chemical instruments and methods, circuits, applications, etc., can solve the problems of large melt viscosity difference, high manufacturing cost, uneven thickness, etc., and achieve excellent hydrolysis resistance and uneven thickness. The effect of suppressing and suppressing uneven thickness

Active Publication Date: 2016-05-04
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the lamination of dissimilar polymers, although the hydrolysis resistance is excellent, there are concerns about i) high manufacturing cost, ii) strong coloring due to photodegradation, iii) difference in melt viscosity when laminating PET and PEN, for example Larger, easy to produce uneven thickness during film production

Method used

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  • Method for producing polyester film, polyester film, back sheet for solar cell, and solar cell module
  • Method for producing polyester film, polyester film, back sheet for solar cell, and solar cell module
  • Method for producing polyester film, polyester film, back sheet for solar cell, and solar cell module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0228] -Twin-screw extruder-

[0229] As an extruder, prepare as figure 1 As shown, the drum with two ventilation holes is equipped with the screw of the following structure, and the drum is equipped with a heater (temperature control unit) that can be divided into 9 zones in the longitudinal direction for temperature control. The twin-screw extruder of the double-ventilation hole type and the same direction rotating meshing type.

[0230] Screw diameter D: 65mm

[0231] Length L[mm] / Screw diameter D[mm]: 31.5 (width of zone 1: 3.5D)

[0232] Screw shape: in front of the first ventilation hole is the plasticizing and kneading section, in front of the second ventilation hole is the degassing promotion kneading section

[0233] After the extruder outlet of the twin-screw extruder, such as figure 2 As shown, a gear pump, a metal fiber filter, and a die having the following configurations were connected, and the set temperature of the heater of the heating die was set to 280°...

Embodiment 2～15

[0268] Except having changed the raw material and extrusion conditions as shown in Table 1, it carried out similarly to Example 1, and produced and evaluated the polyester film. In addition, "catalyst 1" in Table 1 is a Ti-citric acid complex (manufactured by Johnson Matthey, VERTECAC-420), and "catalyst 2" is TiO 2 (manufactured by Sumitomo Metal Industries, Ltd.). In addition, in Examples 14 and 15, a carbodiimide-based compound: "Stabaxol P100" manufactured by Rhein Chemie Co., Ltd., and an epoxy-based compound: "Cardura E10P" manufactured by Hexion Specialty Chemicals Co. Cooperate in the machine.

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Abstract

The present invention provides a method for producing a laminated polyester film, wherein polyester raw resin A including polyester raw resins A1 and A2 with an IV of 0.60 to 0.85 and an AV of 5 to 20 equivalent / ton is prepared, and a polyester raw resin with an IV of 0.55 Recycled material B of polyester resin with an AV of ∼0.80 and an AV of 35 equivalents / ton or less, where raw resin A1 and a mixed raw resin containing resin A2 and recycled material B (10 to 40% by mass) are dried to a moisture content of 100 ppm or less After that, it is co-extruded in such a way that the temperature of the molten resin extruded from the T-die is 280-300°C, and the thickness of the film of the second molten resin containing resin A1 and the first molten The resin film is cooled and solidified on a casting roll in a state of being laminated so as to be relatively thick, and after forming a laminate composed of at least two layers, it is biaxially stretched.

Description

technical field [0001] The present invention relates to a method for producing a polyester film, a polyester film, a solar cell back sheet, and a solar cell module. Background technique [0002] In recent years, a resin material such as polyester has been used for the back sheet arranged on the side opposite to the sunlight incident side of the solar cell module. Polyester usually has many carboxyl groups or hydroxyl groups on its surface, and is likely to be hydrolyzed in an environment where moisture exists, and tends to deteriorate over time. Therefore, polyesters used in solar cell modules and the like that are placed outdoors and are often exposed to wind and rain are required to suppress their hydrolyzability. [0003] As methods for imparting hydrolysis resistance to polyester resins, there are (1) low carboxylation (solid phase polymerization, compounding of end-capping materials, etc.), (2) lamination of different polymers (for example, refer to Japanese Patent App...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/06B29C55/12B32B27/36H01L31/049B29K67/00B29L9/00B29C48/08B29C48/40B29C48/535B29C48/54B29C48/57
CPCB29C48/022B29C48/57B29C48/54B29C55/023B29C55/12B29K2067/00B29K2995/0018B29C48/08B29C48/535B29C48/402B32B27/08B32B27/36B32B2250/244B32B2272/00B32B2307/518B32B2457/00B29B7/483B29B7/845B29B7/86B29B7/823B29B7/826B29B7/726B29B7/421B29C48/40Y02E10/50B29C48/18H01L31/042
Inventor 桑原崇喜
Owner FUJIFILM CORP
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