Composite anti-aging adhesive film shaped like Chinese character'hui '

Abstract

The utility model provides a composite anti-aging adhesive film shaped like a Chinese character'hui ', and belongs to the field of photovoltaic technology. The composite clip-shaped anti-aging adhesive film is characterized by comprising an EVA (Ethylene Vinyl Acetate) layer, a POE (Polyolefin Elastomer) layer is arranged at the periphery of the EVA layer, and the EVA layer and the POE layer are integrally in a clip-shaped structure. According to the utility model, through the edge pure POE layer, water vapor is prevented from entering, the edge volume resistivity is improved, and the anti-PID performance of a POE adhesive film can be shown at an assembly end; and the large-area EVA layer is adopted in the central area, so that the cost can be saved by more than 15%, the raw material cost is close to that of an EVA adhesive film, the crosslinking degree is improved while the cost is reduced, and the adhesive performance between the adhesive films, a battery and glass is also improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaics and relates to a composite anti-aging adhesive film. Background Art

[0002] Photovoltaic EPE film is a polymer material specially used for solar cell module encapsulation. It is located between the cell and the glass or transparent backplane, and plays the role of isolation, bonding and protection. It can not only prevent moisture and oxygen from entering the battery and protect the battery's electrical properties, but also absorb and disperse external impacts to protect the cell from damage. Common films are currently divided into POE, EVA, and EPE. The cost of POE film raw materials is high and the degree of cross-linking is low, but it has strong anti-aging, anti-water permeability, anti-PID ability, and high volume resistivity; EVA film raw materials are low in cost and high in cross-linking, but it is easy to decompose, has weak anti-water permeability, weak anti-PID ability, and low volume resistivity; EPE film is a two-layer EVA sandwiched with a layer of POE, the ratio of POE to EVA is about 1:2, the cost is still high, the EVA layer is a whole piece, after encapsulation, water vapor is still easy to penetrate from the edge of the component to the battery, and the anti-PID ability is not as good as POE. Summary of the invention

[0003] The purpose of the utility model is to solve the above problems in the existing technology and propose a composite anti-aging film, which solves the problem of water permeability of the EVA layer of the EPE film and the problem of still high cost.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A composite anti-aging adhesive film is characterized in that it comprises an EVA layer, a POE layer is arranged around the EVA layer, and the EVA layer and the POE layer are in an overall anti-aging structure.

[0006] In the above-mentioned composite reversible anti-aging adhesive film, the EVA layer and the POE layer are bonded by staggered melting.

[0007] In the above-mentioned composite retractable aging-resistant adhesive film, the width of the POE layer is 30 mm to 50 mm.

[0008] In the above-mentioned composite reversible aging-resistant adhesive film, the cross-linking degree of the POE layer is greater than 75%, and the volume resistivity is greater than 10^16Ω / cm.

[0009] In the above-mentioned composite anti-aging adhesive film, the cross-linking degree of the EVA layer is greater than 85%, and the volume resistivity is greater than 5×10^15Ω / cm.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] The pure POE layer at the edge can block the entry of water vapor while also improving the edge volume resistivity, and can exhibit anti-PID performance comparable to that of POE film at the component end; the use of a large-area EVA layer in the central area can save more than 15% of the cost, and the raw material cost is close to that of EVA film. While reducing the cost, it also increases the degree of cross-linking and improves the bonding performance between the film, battery, and glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure,

[0014] 1. EVA layer; 2. POE layer. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] like Figure 1 As shown,

[0017] A composite anti-aging adhesive film is characterized in that it comprises an EVA layer 1, wherein a POE layer 2 is arranged around the EVA layer 1, and the EVA layer 1 and the POE layer 2 are in an overall anti-aging structure.

[0018] In this embodiment, the edge pure POE layer 2 is used to isolate water vapor from entering while also improving the edge volume resistivity, and can exhibit anti-PID performance comparable to that of the POE film at the component end; a large-area EVA layer 1 is used in the central area, which can save more than 15% of the cost, and the raw material cost is close to that of the EVA film. While reducing the cost, the cross-linking degree is increased, and the bonding performance between the film, the battery, and the glass is also improved.

[0019] In this embodiment, the EVA layer 1 and the POE layer 2 are bonded by staggered melt bonding.

[0020] In this embodiment, the width of the POE layer 2 is 30 mm to 50 mm.

[0021] In this embodiment, the cross-linking degree of the POE layer 2 is greater than 75%, and the volume resistivity is greater than 10^16Ω / cm.

[0022] In this embodiment, the cross-linking degree of the EVA layer 1 is greater than 85%, and the volume resistivity is greater than 5×10^15Ω / cm.

[0023] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. At the same time, the meaning of "and / or" appearing in the full text is that it includes three schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] The above components are all common standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0026] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A composite anti-aging film, characterized in that: It comprises an EVA layer (1), a POE layer (2) is arranged around the EVA layer (1), and the EVA layer (1) and the POE layer (2) are in a circular structure as a whole.

2. The composite anti-aging adhesive film according to claim 1, characterized in that: The EVA layer (1) and the POE layer (2) are bonded together by staggered melt bonding.

3. The composite anti-aging adhesive film according to claim 1, characterized in that: The POE layer (2) has a width of 30 mm to 50 mm.

4. The composite anti-aging adhesive film according to claim 1, characterized in that: The POE layer (2) has a cross-linking degree greater than 75% and a volume resistivity greater than 10^16Ω / cm.

5. The composite anti-aging adhesive film according to claim 1, characterized in that: The EVA layer (1) has a cross-linking degree greater than 85% and a volume resistivity greater than 5×10^15Ω / cm.

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