Solar panel back film and manufacturing technology thereof

A technology for solar cells and sheet back films, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of incompatible air permeability and tear strength, complicated processes, etc., and achieve good weather resistance and strong interlayer adhesion. Effect

Active Publication Date: 2013-10-09
ZHEJIANG VENTURA PHOTOVOLTAIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of the prior art that the process is complicated, the air permeability and the tear strength cannot meet the requirements of photovoltaic cells, the present invention provides a solar cell back film that is easy to process, tear-resistant, and has excellent electrical insulation performance and weather resistance

Method used

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  • Solar panel back film and manufacturing technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Treat the surface of the PET film with a thickness of 150 μm with a surfactant, then wash it with deionized water to remove the oil on the surface of the film, and dry it for later use.

[0042] The PET slices are precipitated after being dissolved in phenol-carbon tetrachloride, and the precipitate is crushed in a pulverizer to powdery PET with a particle size of less than 25 microns.

[0043] In this embodiment, the fluorine-containing resin is polyvinyl fluoride; the solvent is propylene glycol methyl ether; and the crosslinking agent is γ-butyrolactone.

[0044] Mix fluorine-containing resin, PET powder, solvent, crosslinking agent, titanium dioxide (TiO2) and ethylene glycol in a weight ratio of 49:10:10:6:20:5, and mix them uniformly in a glass bead sand mill, Sand mill for 0.5 hours to form a mixed solution with good leveling, fineness less than 25 microns, and moderate viscosity, then heat to 180 degrees Celsius, and apply a layer of fluorine on the adhesive-treat...

Embodiment 2

[0049] The fluorine-containing resin in this embodiment is polyvinylidene fluoride. The solvent is propylene glycol methyl ether; the crosslinking agent is urea-formaldehyde resin.

[0050] Mix fluorine-containing resin, PET powder, solvent, crosslinking agent, silicon dioxide and ethylene glycol in a weight ratio of 50:8:10:6:18:8, mix them uniformly in a glass bead sand mill, and sand After 1 hour, a mixed solution with good leveling, fineness less than 25 microns and moderate viscosity is formed, then heated to 80 degrees Celsius, and a layer of PVDF coating is applied on a clean PET film (thickness is about 150 μm) by roller coating. layer. After baking at a temperature of 180 degrees Celsius for 15 minutes, the solvent in the PVDF coating volatilizes to form a PVDF film with a thickness of about 20 μm.

Embodiment 3

[0052] The fluorine-containing resin in this embodiment is polytetrafluoroethylene. The solvent is methylpyrrolidone; the crosslinking agent is polyisocyanate.

[0053] The surface of PET film with a thickness of 120 μm is destaticized by corona method,

[0054] Fluorine-containing resin, PET powder, solvent, crosslinking agent, silicon dioxide and ethylene glycol are blended in a weight ratio of 30:10:20:6:30:4, mixed uniformly in a glass bead sand mill, and sanded for 1 Hours, form a mixed solution with good leveling, fineness less than 25 microns, and moderate viscosity, then heat to 180 degrees Celsius, and use a roller coating method to coat a PET film (thickness is about 124 μm) coated with EVA glue. Layer PTFE coating. After baking at a temperature of 150 degrees Celsius for 10 minutes, the solvent in the PTFE coating evaporates to form a film with a thickness of about 20 μm.

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Abstract

A solar panel back film comprises a PET film matrix with the thickness of 100-350 micrometers. Fluorine-containing polymer coatings of 15-30micrometers cover the two faces of the matrix, and the fluorine-containing polymer coatings are formed by mixing raw material components according to a proportion to obtain mixed emulsion and coating the PET film matrix by the mixed emulsion which is swollen under the temperature between 80 DEG C and 200 DEG C, wherein raw materials of the fluorine-containing polymer coatings comprise, by mass, polyester PET powder, fluorine-containing resin, solvent, a cross-linking agent, padding and ethylene glycol. The polyester PET powder is polyester PET powder with grain size smaller than 25 micrometers, wherein the polyester PET powder is formed by smashing precipitate obtained by dissolving in phenol-carbon tetrachloride mixed solvent. The fluorine-containing resin is fluorine-containing macromolecule resin. The solar panel back film is easy to process, tearing resistant and superior in electrical insulation performance and weather fastness.

Description

technical field [0001] The invention belongs to the technical field of encapsulation of semiconductor devices, and in particular relates to a back film of a solar panel and a production process thereof. Background technique [0002] The solar cell back film is an integral part of the solar cell, mainly used for the packaging of the solar cell, and is the protective material on the back of the cell panel to support and fix the solar cell. It has the characteristics of insulation (electrical breakdown resistance), aging resistance, weather resistance and corrosion resistance. [0003] At present, solar back film is divided into composite type and coating type. Composite back sheet film mainly includes TPT, TPE and FPF back sheet film. TPT is made of Tedlar / PET / Tedlar three-layer independent film through glue bonding and hot pressing. , where T represents polyvinylfluoride PVF (Polyvinylfluoride), with a thickness of about 37 μm. This layer is used as the main layer of solar c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/048C09D167/02C09D127/12C09D127/14B32B27/08H01L31/18
CPCY02E10/50Y02P70/50
Inventor 王洪钧郭昕王祖伟
Owner ZHEJIANG VENTURA PHOTOVOLTAIC MATERIALS
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