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Multilayer coextruded surface-layer pre-crosslinked adhesive film

A multi-layer co-extrusion and surface layer technology, applied in adhesives, film/sheet adhesives, photovoltaic power generation, etc., can solve problems such as unclear color interface, color penetration of the upper and lower layers, and affect the appearance of components, etc., to achieve suitable For large-scale promotion and application, the effect of simple structure and ingenious design

Active Publication Date: 2013-04-03
SHANGHAI HIUV NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the melting speed of the upper and lower layers of the adhesive film is inconsistent because the adhesive film cannot be completely flattened, causing the color of the lower layer to penetrate into the upper layer, resulting in unclear color interface and affecting the appearance of the component.
Some companies use double-layer co-extrusion to try to solve the problem, that is, the upper layer is a transparent layer and the lower layer is a color layer, but the color penetration of the upper and lower layers still occurs in the manufacture of solar cell modules

Method used

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  • Multilayer coextruded surface-layer pre-crosslinked adhesive film
  • Multilayer coextruded surface-layer pre-crosslinked adhesive film
  • Multilayer coextruded surface-layer pre-crosslinked adhesive film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

Not crosslinked

[0029] The composition of the upper and lower layers is as follows:

[0030]

[0031] The produced double-layer co-extruded EVA film is irradiated by ultraviolet light, and the upper layer (surface layer) faces the ultraviolet light tube. The ultraviolet light adopts an inorganic lamp, and the intensity of the lamp is 1800 milliwatts / square centimeter, and the time is 3 seconds. The test method of the degree of cross-linking is that xylene is extracted for 4 hours at 140° C. with a spherical flask equipped with a condenser tube, and the ratio of the weight of EVA that cannot be dissolved in xylene to the original weight is compared.

[0032] Place the above adhesive film and the transparent EVA adhesive film on the lower side and the upper side of the solar battery sheet respectively. The adhesive film on the upper side is an ordinary transparent adhesive film. After lamination, it was found that the surface of the white layer was smooth, and th...

Embodiment 2

slightly crosslinked

[0037] The composition of the upper and lower layers is as follows:

[0038]

[0039] The surface layer of the above adhesive film was pre-crosslinked by ultraviolet light similar to that used in Example 1. It is used in solar cell modules with front glass / transparent EVA film / cell sheet / multilayer co-extruded surface layer pre-crosslinked EVA film / back glass structure. The measured pulling force of the multi-layer co-extruded film and the back glass is greater than 60 N / cm. The interface of the black layer of the multi-layer co-extrusion adhesive film is clear, and the black color does not penetrate into the upper side adhesive film, nor does it cover the edge of the battery sheet or cover the welding ribbon connecting the battery sheet. Because the lower layer of the multi-layer co-extrusion film is black, it absorbs heat under ultraviolet radiation. Although there is no photoinitiator, it also leads to resin crosslinking caused by some pe...

Embodiment 3

[0041]

[0042] Except that 4% talcum powder (EVA correspondingly reduces 4%) is added in the formula of upper layer, other is identical with embodiment 1. Lower layer formula is with embodiment 1. After being irradiated by ultraviolet light, it is used for lamination of glass / transparent EVA adhesive film / cell sheet / adhesive film of Example 3 / back plate. The lamination temperature is 145 degrees centigrade and the time is 15 minutes. The type of the back sheet is fluoroplastic / PET / EVA, wherein the EVA is EVA with 8% VA content, and the thickness of the layer is 0.25 mm. After lamination, the interface of the white layer of the lower EVA film was clear, and the white did not seep into the upper transparent film, nor did the white cover the edges of the cells or the solder strips connecting the cells. The lower layer of EVA cannot be separated from the backplane.

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Abstract

The invention relates to a multilayer coextruded surface-layer pre-crosslinked adhesive film which comprises at least two coextruded adhesive film layers, wherein the surface layer is a pre-crosslinked surface layer, and at least one of the other layers is a color layer. Preferably, the surface layer is transparent or semitransparent. The surface layer is a partially pre-crosslinked surface layer or completely pre-crosslinked surface layer. The degree of crosslinking of the surface layer is greater than 10%. The main component of the coextruded adhesive film is ethylene-vinyl acetate resin. The thickness of the multilayer coextruded surface-layer pre-crosslinked adhesive film is 0.1-2 millimeters. The multilayer coextruded surface-layer pre-crosslinked adhesive film provided by the invention has the advantages of ingenious design and simple structure, can be used as a lower-layer adhesive film of a cell piece in a solar cell module, prevents the color of the lower-layer adhesive film from infiltrating into the upper-layer adhesive film of the cell piece, and is suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of adhesive films, in particular to the technical field of adhesive films for solar cells, and specifically refers to a multi-layer co-extruded surface layer pre-crosslinked adhesive film, which can be used as an ordinary solar crystal silicon module between the battery sheet and the back plate The encapsulation film can also be used as the encapsulation film between the cell and the lower glass in the double glass module. Background technique [0002] Solar cell modules need to be encapsulated with a suitable adhesive film to protect the cells or deposited cell layers. The most common film is EVA film, which is composed of ethylene-vinyl acetate copolymer (EVA) and a small amount of crosslinking agent, anti-aging agent and other functional additives. EVA resin is a general-purpose plastic, the weight content of vinyl acetate (VA) is from 5% to 40%, and EVA with VA content between 18% and 33% is mainly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J4/06C09J4/02C09J123/08H01L31/048
CPCY02E10/50
Inventor 李民
Owner SHANGHAI HIUV NEW MATERIALS
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