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Method for preparing polyester film for photovoltaic cell backplane

A polyester film, photovoltaic cell technology, applied in applications, circuits, electrical components, etc., can solve the problem of reducing the aging resistance of polyester film, and achieve the effect of excellent aging resistance

Inactive Publication Date: 2012-07-04
申达集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This greatly reduces the aging resistance of the polyester film

Method used

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  • Method for preparing polyester film for photovoltaic cell backplane
  • Method for preparing polyester film for photovoltaic cell backplane
  • Method for preparing polyester film for photovoltaic cell backplane

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Embodiment Construction

[0037] The present invention will be further described below with specific examples, which are easily grasped and verified by those skilled in the art. The present invention is illustrated by examples, but not limited thereto.

[0038] Terephthalic acid (PTA), ethylene glycol (EG), triethyl phosphate (TEP), antimony acetate and antioxidant 1010, the specific formulations of the five substances are as follows:

[0039] Table 3 PET synthesis monomer ratio

[0040]

[0041] On the polyester batch polymerization device, first add terephthalic acid (PTA), ethylene glycol (EG) and antimony acetate to the reactor according to the above formula, and the temperature rises to 265°C for esterification reaction. At this time, triethyl Phosphate ester (TEP) and antioxidant 1010 are formulated with ethylene glycol (EG), and when the esterification rate reaches 95%, triethyl phosphate ester formulated with ethylene glycol and antioxidant 1010 are added. Under the pressure of 25Pa, react...

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Abstract

The invention relates to a method for preparing a polyester film for a photovoltaic cell backplane, which comprises:1, a process step of synthesizing polyester chips, which is to first add terephthalic acid, glycol and antimony acetate serving as a catalyst into a reaction kettle to perform esterification, then to add triethyl phosphate and antioxidant 1010 which are blended with glycol to perform an reaction and finally to discharge the products of the reaction; 2, a process step of preparing mother particles, which is to crush the polyester chips synthesized by the step 1, dry the crushed polyester chips, add polycarbodiimide, an ultraviolet absorber MV 3638, triethyl phosphate and antioxidant 1010, mix the mixture and extrude the mixture by a double-screw extruder to produce the particles; and 3, a process step of producing a film by biaxial tension, which is to place the polyester chips synthesized by the step 1, the mother particles prepared by the step 2 and SiO2 3,000+ / -100ppm PET polyester chips into the double-screw extruder for blending the mixture, melt and extrude the mixture in the double-screw extruder, casting a piece by a casting piece machine and prepare the film by biaxial tension. The method of the invention can change an active terminal carboxyl group into a stable group, so the polyester film has high aging resistance.

Description

(1) Technical field [0001] The invention relates to a preparation method of a polyester film used for a photovoltaic battery back plate. The invention belongs to the technical field of polymer polymerization and processing. (2) Background technology [0002] The main purpose of the early invention of solar cells was to be applied to spacecraft. DuPont’s TPT three-layer composite film was selected as its back film, Tedlar (polyvinylidene fluoride film) ~ PET (polyethylene terephthalate) ~ Tedlar (polyvinylidene fluoride film) is composed of three layers. The inner layer and the outer layer are made of polyvinylidene fluoride. Due to the high bond energy of F~C bonds, the aging resistance is excellent. In the early days, a pure PET backsheet was tried, but due to the backwardness of PET synthesis technology at that time, it failed. In recent years, when it has been converted to civilian use, TPT is still used on the backplane of photovoltaic cells. The typical brand is TPT f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/12B29C47/92B29B9/06B29B13/06H01L31/18H01L31/0203C08L67/02C08K5/521B29L7/00B29C48/40B29C48/92H01L31/049
CPCB29C48/92B29C2948/92704B29C48/04B29C48/08B29C48/40B29C48/9185B29C2948/926B29C2948/92895B29C2948/92904
Inventor 魏文良薛志刚薛峰
Owner 申达集团有限公司