A kind of white encapsulating adhesive film for solar cell module

Abstract

The invention discloses a white packaging adhesive film for a solar cell module. The white packaging adhesive film for the solar cell module comprises the following components in parts by mass: 10 to90 parts of EVA, 10 to 90 parts of modified POE, 5 to 20 parts of a white filler, 0.1 to 5 parts of a silane coupling agent and 0.1 to 8 parts of an aid. Experiments prove that the melt extrusion of the white packaging adhesive film still can be controlled to be within a short time and the laminating time is relatively short, so that the preparation of the adhesive film and the solar cell module is facilitated and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of solar cells, in particular to a white packaging adhesive film used for solar cell components. Background technique [0002] At present, energy and environmental problems are becoming more and more severe, and it is imminent to seek a clean and sustainable new energy source. The solar photovoltaic power generation industry based on the photoelectric conversion effect is gradually entering the human energy structure. Among them, solar cell modules are one of the products that have achieved commercial success and have also attracted worldwide attention. Solar cell modules are mainly composed of high-efficiency monocrystalline / polycrystalline solar cells, glass, EVA packaging film, backplane and aluminum alloy frame. Among them, the EVA encapsulation film is a polar polymer compound with strong adhesion, and is currently the conventional choice for encapsulation films in solar cell modules. [0003] For solar cell co...

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Problems solved by technology

[0004] However, the existing EVA encapsulation film has the following problems: (1) Since EVA is a polar polymer compound, it is not resistant to hydrolysis, and it is easy to decompose and yellow during the use of solar cells, especially under high temperature and high humidity conditions. , will produce PID phenomenon, resulting in module power attenuation; (2) The melt index of EVA encapsulation film is high, and in the subsequent lamination process of preparing components, the melt fluidity of EVA is high, which will cause white EVA to overflow to the front of the cell (i.e. overflowing white phenomenon), resulting in partial blocking of the battery sheet, which will reduce the output power and durability of the module; Defects such as wrinkles

[0005] In order to solve this problem, the prior art mostly adopts non-polar polyolefin instead of EVA as the encapsulation film. For example, Chinese invention patent application CN106684186A discloses a method for preparing a good encapsulation film without flanging. A kind of adhesive film with three-layer structure solves the problem that the packaging adhesive film is easy to overflow

[0006] However, the above-mentioned encapsulation film has the following problems: (1) Since there is no polar group in the polyolefin molecule, the surface adsorption capacity of the material is very poor, the surface tension is small, and it is difficult to bond, which makes the inorganic pigment powder (titanium dioxide) difficult to bond. It is well dispersed in polyolefin, and the dispersion problem will affect the performance of all aspects of the film, especially after long-term use, the polyolefin resin will cause glue opening due to insufficient adhesion; (2) polyolefin Resin has poor moisture and heat aging resistance, and it is prone to edge blistering and even delamination during lamination

[0007] Therefore, developing a white encapsulation film that has excellent performance and can solve the problem of easy overflow of the encapsulation film has become an urgent technical problem in this field.

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