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Low-melt-index white EVA (ethylene vinyl acetate) photovoltaic adhesive film preparation method

A melting index and white technology, applied in the field of preparation of low-melting index white EVA photovoltaic film, can solve the problems of unstable operation of electronic radiation generators, cracked cells, difficult preparation, etc., and reduce wrinkles and white overflow. risk, improve photoelectric conversion efficiency, eliminate bubbles and cracks

Inactive Publication Date: 2018-01-30
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of the technical level, the current electronic radiation generator is not stable, and it is easy to cause radiation inhomogeneity, that is, local excess or low amount. Excessive amount will bring the risk of cell cracks and bubbles, and low amount will appear again. Risk of wrinkling and whitening
At the same time, due to poor hot melt performance, the low-melt EVA film will bring greater load to the equipment during hot-melt extrusion, causing greater difficulties in processing. The traditional casting method is difficult to prepare, but the calendering method has the ability to operate. Features of reduced load and high production rate

Method used

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with specific embodiments.

[0018] The materials used are:

[0019] Main material: ethylene-vinyl acetate copolymer (EVA), VA content is 33%, melt flow rate is 1.0g / 10min~10g / 10min.

[0020] White filler: particles of titanium dioxide, white carbon black or barium sulfate, the surface of which is coated with organic matter, and processed into 30-70% concentration of EVA white masterbatch for use.

[0021] Antioxidant: the main antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate; the secondary antioxidant is tris(4-nonylphenol) phosphorous acid A complex of esters and tris(2,4-di-tert-butylphenyl)phosphite.

[0022] Cross-linking agent: the cross-linking curing agent is a compound of tert-butyl peroxide 2-ethylhexyl carbonate and 3,3-bis(tert-butyl peroxy) ethyl butyrate; the auxiliary cross-linking agent is triallyl Compounds of isocyanurate, triallyl cyanurate and trimethylol...

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Abstract

The invention relates to the technical field of photovoltaic adhesive films, in particular to a low-melt-index white EVA (ethylene vinyl acetate) photovoltaic adhesive film preparation method. The method includes: well mixing a low-melt-index ethylene-vinyl acetate copolymer, an antioxidant, a cross-linking agent and a silane coupling agent, and performing melt coextrusion, wherein the temperatureof each area of an extruder is 80-90 DEG C; after extruding, subjecting to three-roll rolling and cooling rollers, and then performing embossing, thickness measuring and shaping; finally trimming, winding, packaging and storing. By adoption of the technical scheme, the method has advantages that 1, by adoption of low-melt-index EVA adhesive particles, hot melt viscosity of an EVA adhesive film can be remarkably improved while hot melt fluidity and risks of creasing and excessive white in a lamination vacuumizing process are reduced; 2, by adoption of a rolling method for preparing the low-melt-index white EVA film, defects of high load and processing difficulty of a casting method are overcome, and easiness in processing is achieved while efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic adhesive films, in particular to a method for preparing a low-melt white EVA photovoltaic adhesive film. Background technique [0002] The basic structure of solar photovoltaic modules consists of 5 layers from top to bottom: upper layer of high-transparency photovoltaic glass, upper layer of EVA film, battery sheet, lower layer of EVA film, photovoltaic backplane or lower layer of photovoltaic glass. Due to this structure, sunlight is incident from the glass, passes through the upper layer of EVA film, and reaches the battery sheet to realize photoelectric conversion. The sunlight will be greatly lost in the interval between the battery sheets and the blank space between the battery sheet and the module edge. If the bottom is For photovoltaic glass, the sunlight will be emitted directly. If it is a photovoltaic backplane, since the reflectivity of the backplane is not high, about 70-80%, 20-...

Claims

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Application Information

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IPC IPC(8): C09J123/08C09J11/06C09J11/04H01L31/048
CPCY02E10/50
Inventor 曾金栋何胡送
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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