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Multi-layer co-extrusion anti-polarization type composite adhesive film and preparation method thereof

A multi-layer co-extrusion and anti-polarization technology, which is applied in the direction of adhesives, films/sheets without carriers, photovoltaic power generation, etc., can solve the problem of reducing the light transmittance and volume resistivity of adhesive films, reducing the power generation efficiency of cells, and reducing components. Power generation efficiency and other issues, to achieve the effect of reducing light transmittance and volume resistivity, improving anti-PID performance, and reducing power generation efficiency

Inactive Publication Date: 2019-08-02
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the power generation process of the solar photovoltaic module, a negative voltage will be generated through the outer frame, which will cause the sodium ions and potassium ions in the glass to pass through the adhesive film layer to reach the surface of the battery sheet, and accumulate on the surface of the battery sheet to form a positive electric field, thereby causing the battery The accumulation of negative charges inside the cell forms a negative electric field to counterbalance, reducing the carriers in the cell, thereby reducing the power generation efficiency of the cell and causing the PID phenomenon
[0003] Taineng photovoltaic modules will be eroded and penetrated by water vapor when used outdoors for a long time. Water vapor will penetrate into the module through the back plate and glass. If the conventional EVA packaging film is used, because the VA segment in the EVA molecular segment encounters Water vapor will degrade, release acetic acid, produce bubbles, delamination and yellowing, reduce the light transmittance and volume resistivity of the adhesive film, and reduce the potential on the cell, thereby reducing the power generation efficiency of the module and shortening the service life of the module

Method used

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  • Multi-layer co-extrusion anti-polarization type composite adhesive film and preparation method thereof
  • Multi-layer co-extrusion anti-polarization type composite adhesive film and preparation method thereof

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Experimental program
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Effect test

Embodiment approach 1

[0024] POE resin adopts melt flow rate of 18g / 10min, light transmittance > 90%, volume resistivity ≥ 1.0×10 15 , pellets with a melting temperature of 64°C, control the extrusion thickness of the POE resin layer to 0.25mm; the EAA anti-polarization layer uses EAA resin, the EAA resin uses acrylate content of 30%, the melting point is 65°C, and the melt index is 11g / 10min pellets, control the extrusion thickness of the EAA layer to 0.3mm; EVA resin adopts a melt flow rate of 25g / 10min, light transmittance > 86%, volume resistivity ≥ 1.0×10 14 , with a melting temperature of 56°C and a VA content of 28%, the extruded thickness of the EVA resin layer is controlled to be 0.25mm; the POE resin layer, the copolymer resin anti-polarization layer and the EVA resin layer are respectively produced by three single-screw extruders Extruded to the same three-layer co-extrusion die head, the extrusion temperature is 80-100°C, and the three-layer material is extruded from the die head to pr...

Embodiment approach 2

[0026] The melt flow rate of POE resin is 14g / 10min, the light transmittance is >90%, and the volume resistivity is ≥1.0×10 15 , pellets with a melting temperature of 58°C, the extruded thickness of the POE resin layer is controlled to be 0.3mm; the EAA anti-polarization layer is made of EMA resin, the EMA resin is made of acrylate content of 25%, the melting point is 63°C, and the melt index is 15g / 10min pellets, control the extrusion thickness of the EMA layer to 0.2mm; EVA resin adopts a melt flow rate of 20g / 10min, light transmittance > 91%, volume resistivity > 1.0×10 14 , with a melting temperature of 54°C and a VA content of 25%, the extrusion thickness of the EVA resin layer is controlled to be 0.3mm; the POE resin layer, the copolymer resin anti-polarization layer and the EVA resin layer are respectively produced by three single-screw extruders Extruded to the same three-layer co-extrusion die head, the extrusion temperature is 80-100°C, and the three-layer material ...

Embodiment approach 3

[0028] POE resin adopts melt flow rate of 18g / 10min, light transmittance > 90%, volume resistivity ≥ 1.0×10 15 , pellets with a melting temperature of 64°C, control the extruded thickness of the POE resin layer to 0.3mm; the EAA anti-polarization layer uses PTW resin, the PTW resin uses acrylate content of 28%, the melting point is 69°C, and the melt index is 8g / 10min pellets, control the extrusion thickness of PTW layer to 0.3mm; EVA resin adopts melt flow rate of 25g / 10min, light transmittance> 86%, volume resistivity ≥ 1.0×10 14 , with a melting temperature of 56°C and a VA content of 28%, the extruded thickness of the EVA resin layer is controlled to be 0.3mm; the POE resin layer, the copolymer resin anti-polarization layer and the EVA resin layer are respectively produced by three single-screw extruders Extruded to the same three-layer co-extrusion die head, the extrusion temperature is 80-100°C, and the three-layer material is extruded from the die head to prepare a com...

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Abstract

The invention relates to the technical field of a packaging adhesive film for a solar photovoltaic module, in particular to a multi-layer co-extrusion anti-polarization type composite adhesive film. The multi-layer co-extrusion anti-polarization type composite adhesive film comprises a POE (polyolefin elastomer) resin layer, a polymer resin anti-polarization layer and an EVA (ethylene-vinyl acetate copolymer) resin layer which are arranged from top to bottom in sequence, wherein the POE resin layer, the polymer resin anti-polarization layer and the EVA resin layer are subjected to three-layerco-extrusion. With the adoption of the structure and the method, the problems of bubbles, no melting and cell combination in a laminating process of the photovoltaic module can be solved, steam permeation in a using process of the module can be effectively reduced, the PID problem of the module can be solved, the packaging defect rate is reduced, the production efficiency of the module is improved, and the PID risk of the module is reduced. The preparation method is simple, the production efficiency is high, the cost is low, and large-scale production can be realized.

Description

technical field [0001] The invention relates to the technical field of packaging adhesive films for solar photovoltaic modules, in particular to a multilayer co-extrusion anti-polarization composite adhesive film and a preparation method thereof. Background technique [0002] The traditional packaging film for solar photovoltaic modules is mainly ethylene-vinyl acetate copolymer (EVA) film, and the VA (vinyl acetate) content in the film needs to be greater than 25%. Since EVA is a polar resin, it has good compatibility with polar additives, and it is not easy to produce bubbles, unfused and laminated problems during component lamination. However, during the power generation process of the solar photovoltaic module, a negative voltage will be generated through the outer frame, which will cause the sodium ions and potassium ions in the glass to pass through the adhesive film layer to reach the surface of the battery sheet, and accumulate on the surface of the battery sheet to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/10H01L31/048
CPCC09J2203/322C09J2423/04C09J7/10C09J2301/208H01L31/0481Y02E10/50
Inventor 金旭黄宝玉吕松张刚乔刚童伟
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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