A kind of encapsulating adhesive film for solar cell and preparation method thereof
A film and formula technology, applied in the field of solar cell materials, can solve the problems of reducing the service life of solar cell modules, power generation efficiency power attenuation, aging and yellowing, etc., and achieves the improvement of volume resistivity, improvement of barrier performance, and enhancement of barrier effect. Effect
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[0022] The present invention also provides a preparation method of the packaging adhesive film, specifically comprising the following steps:
[0023] (1) Fully mix the components of EVA layer and POE layer respectively. Among them, the PLA in the POE layer is first heated to a molten state, and the temperature of the melt is lowered, and the remaining components of the POE layer are added and fully mixed.
[0024] (2) First mix the POE in the EVA-POE layer and the same amount of EVA thoroughly, then add the same amount of EVA as the mixed POE and EVA, and mix thoroughly; then add the rest of the components, and mix well at high speed.
[0025] (3) Add the mixed materials of EVA layer, POE layer and EVA-POE layer to the co-extrusion casting machine respectively, and the POE layer is located in the middle layer. Three layers of materials are co-extruded, cooled, shaped, rolled, and packaged to obtain the required film. Wherein, the temperature of the runner, extrusion and die ...
Embodiment
[0028] 1. Prepare 14 groups of films according to the above method, and the formula composition of each group is shown in Table 1. And at the same time, common EVA film was purchased from the market as a positive control group. Wherein, the parts of each group in the table refer to parts by weight; there is only one layer in groups 1, 2, and 3, so it can be directly extruded and shaped without co-extrusion. It should be noted that the applicant did not only conduct the experiments in Table 1, but only selected some representative groups and data for display due to space limitations.
[0029] Table 1 Display of the components of the film formulations in each group
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[0034] 2. Refer to the methods and standards of GB / T 29848-2018 "Ethylene-vinyl acetate copolymer (EVA) film for photovoltaic module encapsulation" to measure and evaluate the basic performance of each group of films. Choose cells of the same batch and type, use each...
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