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Method for preparing low-melt-flow-index EVA (Ethylene-Vinyl Acetate) three-layer composite photovoltaic film

A layer compounding and melting finger technology is applied in the field of preparation of low-melting finger EVA three-layer composite white photovoltaic adhesive film, which can solve the problems of low hot-melt fluidity, improve hot-melt viscosity, eliminate air bubbles and hidden cracks, and reduce The effect of manufacturing costs

Inactive Publication Date: 2018-02-23
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is a method for preparing a low-melt EVA three-layer composite white photovoltaic adhesive film with low hot-melt fluidity and no risk of wrinkles and whitening

Method used

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  • Method for preparing low-melt-flow-index EVA (Ethylene-Vinyl Acetate) three-layer composite photovoltaic film
  • Method for preparing low-melt-flow-index EVA (Ethylene-Vinyl Acetate) three-layer composite photovoltaic film
  • Method for preparing low-melt-flow-index EVA (Ethylene-Vinyl Acetate) three-layer composite photovoltaic film

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Embodiment Construction

[0019] Such as figure 1 As shown, the low-melt index EVA three-layer composite white photovoltaic film of the present invention includes a middle white EVA layer 1 and an upper transparent EVA layer 2 and a lower transparent EVA layer 3 arranged above and below the middle white EVA layer. In the middle white EVA layer Contains white filler.

[0020] The materials used are:

[0021] Main material: ethylene-vinyl acetate copolymer (EVA). The VA content is 33%, and the melt index is 7.5g / 10min.

[0022] Titanium dioxide: the surface is coated with organic matter and processed into 30-70% concentration EVA white masterbatch for use.

[0023] Antioxidant: the main antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl) stearyl propionate; the auxiliary antioxidant is tris(4-nonylphenol) phosphorous acid A compound of ester and tris(2,4-di-tert-butylphenyl) phosphite.

[0024] Cross-linking agent: cross-linking curing agent is a compound of 2-ethylhexyl tert-butyl peroxide and 3,3-di(tert-bu...

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Abstract

The invention relates to the technical field of photovoltaic films and in particular relates to a method for preparing a low-melt-flow-index EVA (Ethylene-Vinyl Acetate) three-layer composite photovoltaic film. The method comprises the following steps: fully mixing a low-melt-flow-index EVA copolymer, a white filler, an antioxidant as well as a cross-linking agent and a silane coupling agent, andadding the mixture into an extruder hopper so as to prepare a white EVA layer; fully mixing the low-melt-flow-index EVA copolymer, the antioxidant as well as the cross-linking agent and the silane coupling agent, adding the mixture into the extruder hopper so as to prepare upper and lower transparent EVA layers; and performing melt co-extrusion, controlling the temperature and humidity in each area of the extruder and the die head to be 80-90 DEG C, extruding by a co-extrusion die head, cooling by a casting roller, performing thickness measuring and embossing for setting, and finally trimmingand rolling, and packaging and warehousing. With the adoption of the method, the product manufactured by the method disclosed by the invention is wide in application range, the reflective rate reaches90% or higher, the photovoltaic conversion efficiency of the photovoltaic module can be improved, and phenomena such as bubbles, subfissure, fold and bleeding can be simultaneously eliminated.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic adhesive films, in particular to a method for preparing a low-melting finger EVA three-layer composite white photovoltaic adhesive film. Background technique [0002] In the past ten years, due to technological progress and low cost, my country's photovoltaic industry has developed very rapidly. Since 2008, its output and output value have surpassed that of photovoltaic powerhouses such as Germany and Japan, ranking first in the world. However, it is difficult to improve the photoelectric conversion effect of solar cells at present, and it has been maintained between 18% and 19%. How to improve the photoelectric conversion efficiency of photovoltaic cells has become the focus of the world's photovoltaic industry and an important reference for governments in the new energy industry layout. The current photoelectric conversion efficiency is still far from the theoretically calculated power generatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K13/02C08K5/54C08K5/134C08K5/526B29C47/06B29C47/92B29C48/92
CPCB29C48/18B29C48/92B29C2948/92704C08K5/1345C08K5/526C08K5/54C08K13/02C08L23/0853
Inventor 曾金栋何胡送
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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