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Method for preparing polyester film for solar cell backsheet film

A technology of solar cells and polyester films, which is applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of insufficient flame retardancy, difficulty in meeting the performance requirements of solar cell backplane films, and poor heat and humidity resistance, and achieve improvement Effects of crystallization performance, reduction of water vapor transmission rate, and increase of steric hindrance

Active Publication Date: 2011-02-09
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, after aging for 1000 hours at 85°C and 85% humidity, the film becomes brittle; the water vapor transmission rate of commonly used polyester films with a thickness of 0.250mm is 2.5g / m2 at 38°C and 90% humidity 2 .24h or more; the flame retardancy cannot reach UL94VTM-2 (if a flame retardant is added, its flame retardancy can reach UL94VTM-2, but its heat and humidity resistance will be worse); it is difficult to meet the requirements of TPT, TPE, KPK composite film, etc. Performance requirements of solar cell backsheet film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Production of modified polyester resin chips: 200 parts by mass of terephthalic acid, 50 parts by mass of 2,6-naphthalene dicarboxylic acid, 96 parts by mass of ethylene glycol, 0.01 parts by mass of adipic acid, 0.5 parts by mass of The pentaerythritol, the cobalt acetate of 0.09 mass parts, the antimony trioxide of 0.10 mass parts and the triphenyl phosphate of 0.02 mass parts are added to the pulping tank, start the mixer, after beating for 25 minutes with 60 rev / min speeds, gradually Add an esterification kettle, the esterification reaction is controlled at 250-255°C, the reaction is controlled within 3-4 hours, the temperature is kept at 250-265°C, and the pressure is kept at 1×10 5 ~2×10 5 Pa, about 30 minutes, when the water output reaches more than 95% of the theoretical water output, it is considered that the esterification is completed, and it is transferred to the diesterification kettle. Add 0.3 parts by mass of cis 9, cis 12, cis 15-octadecatrienoic acid, ...

Embodiment 2

[0048] Production of modified polyester resin chips: 400 parts by mass of terephthalic acid, 155 parts by mass of ethylene glycol, 5 parts by mass of 1,3-propanediol, 0.01 parts by mass of pentaerythritol, 0.07 parts by mass of Add cobalt acetate, 0.04 parts by mass of antimony trioxide and 0.03 parts by mass of phosphoric acid into the pulping tank, start the mixer to beat at a speed of 50 rpm for 30 minutes, then gradually add an esterification kettle, and the esterification reaction is controlled at 245- 255°C, the reaction is controlled within 3 to 4 hours, and the temperature is kept at 250 to 265°C, and the pressure is kept at 1×10 5 ~2×10 5 Pa, about 30 minutes, when the water output reaches more than 95% of the theoretical water output, it is considered that the esterification is completed, and it is transferred to the diesterification kettle. Add 1.0 parts by mass of cis 6, cis 9, cis 12-octadecatrienoic acid, start the mixer, stir at a speed of 50 rpm, keep the temp...

Embodiment 3

[0052] Production of modified polyester resin chips: 50 parts by mass of terephthalic acid, 350 parts by mass of 2,6-naphthalene dicarboxylic acid, 130 parts by mass of ethylene glycol, 2 parts by mass of neopentyl glycol, 0.1 parts by mass Parts of pentaerythritol, 0.1 parts by mass of 1,3,5 cyclohexanetriol, 0.08 parts by mass of cobalt acetate, sodium acetate mixture (cobalt acetate: sodium acetate=1:3), 0.09 parts by mass of trioxide Diantimony and 0.06 parts by mass of trimethyl phosphate are added to the pulping tank, the mixer is started, and after beating at a speed of 100 rpm for 15 minutes, they are gradually added to an esterification kettle. Finish adding within 3-4 hours, keep warm at 250-265°C, hold pressure 1×10 5 ~2×10 5 Pa, about 30 minutes, when the water output reaches more than 95% of the theoretical water output, it is considered that the esterification is completed, and it is transferred to the diesterification kettle. Add 0.03 parts by mass of cis 6, c...

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Abstract

The invention discloses a method for preparing a polyester film for a solar cell backsheet film, which is characterized by comprising the following steps of: mixing 200 to 400 mass parts of binary acid, 80 to 160 mass parts of dihydric alcohol, 0.01 to 0.5 mass part of highly-branched polyatomic alcohol, an esterification catalyst for synthesis of polyester, a polycondensation catalyst and a stabilizing agent and carrying out an esterification reaction; adding 0. 1 to 1.0 mass part of high-grade polyenoic fatty acid or alcohol, continuously esterifying, filtering materials and pressing into a polycondensation kettle for a pre-polycondensation reaction so as to prepare modified polyester resin slices; mixing the modified polyester resin slices and master batch polyester slices according to a mass ratio of 100:5-30; and drying, melting, filtering, extruding, cooling a cast piece, biaxially drawing, performing molding treatment and the like so as to prepare the polyester film for the solar cell backsheet film. The film product has excellent mechanical and electrical performances, heat and humidity resistance, dimensional stability, flame retardant property and water vapor permeability resistance.

Description

technical field [0001] The invention belongs to a method for manufacturing a material for parts of solar equipment, and relates to a method for manufacturing a polyester film for a solar battery backplane film. The prepared polyester film is suitable for use as an intermediate layer (or called a base film) of a solar cell back sheet film, mainly as a main support to improve the outdoor service life of the solar cell. Background technique [0002] In the prior art, there are mainly the following types of composite solar cell backsheet films at home and abroad: [0003] TPT (the composite film is made of PVF polyvinyl fluoride film layers on both sides, that is, the Tedlar film layer of DuPont Company of the United States, and the PET polyester film layer in the middle, which is made by compounding, referred to as TPT); [0004] TPE (the composite film is composed of a PVF film layer on one side, an EVA ethylene-vinyl acetate copolymer film layer on the other side, and a PET ...

Claims

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Application Information

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IPC IPC(8): C08L67/06C08K3/36C08K3/30H01L31/0203C08G63/21B29C55/14C08K3/22C08L67/00H01L31/048
CPCY02E10/50
Inventor 曾强李建学胡俊祥罗春明
Owner SICHUAN DONGFANG INSULATING MATERIAL
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