Modified polyvinylidene fluoride material used for solar cell protective films and preparation method thereof

Abstract

The invention provides a modified polyvinylidene fluoride (PVDF) material used for solar cell protective films and a preparation method thereof. The material comprises: 55-70% of PVDF, 10-20% of high density polyethylene (HDPE), 3-6% of polyethylene grafted maleic anhydride, 10-20% of an ethane-octylene copolymer, 0.3-0.6% of an anti-oxidant, and 0.2-0.5% of a lubricant. The preparation process consists of: first adding each component material into a high speed mixing bucket according to the ratio for uniform mixing; adding the obtained mixture into a double-screw extruder for mixing; controlling the extrusion temperature of the first and second segment of the double-screw extruder composed of six segments at 150-170DEG C, and controlling the extrusion temperature of the other segments at 170-200DEG C; leaving the reactant to stay in the double-screw extruder for 3-6min totally, and keeping the rotating speed of the double-screw extruder at 300-350r.min<-1>; conducting cooling and pelletizing to the obtained material after extrusion, thus obtaining the modified polyvinylidene fluoride material used for solar cell protective films. The adding of HDPE into PVDF for modification can obviously reduce the crystallization degree of PVDF, and enhance the processibility of PVDF.

Description

technical field

[0001] The invention relates to a polyvinylidene fluoride material, in particular to a modified polyvinylidene fluoride material used for a protective film of a solar cell and a manufacturing method thereof. Background technique

[0002] A solar cell is a solar power generation device that directly converts sunlight energy into DC power, and is a clean energy source with economic benefits, environmental benefits and sustainable development. The solar cell module is composed of a high conversion efficiency monolithic solar conversion silicon wafer, ethylene-vinyl acetate copolymer film (E / VAC), low-iron tempered glass, and a back film made of fluorine plastic film and polyester film. composition. These elements are heated and laminated under vacuum to form a whole, and finally the anti-corrosion aluminum alloy frame and junction box are installed to become the finished solar cell module.

[0003] At present, the adhesion of the fluoroplastic film in the back...

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