Quick crosslinked ethylene-vinyl acetate copolymer (EVA) adhesive film for double-glazed module, and preparation method of EVA adhesive film

Abstract

The invention discloses a quick crosslinked ethylene-vinyl acetate copolymer (EVA) adhesive film for a double-glazed module, and a preparation method of the EVA adhesive film. The EVA adhesive film is prepared by mixing an EVA, a compatibilizer, a photoinitiator, a crosslinking agent, a defoaming agent and an antioxidant. The preparation method comprises the following steps: A. evenly mixing the EVA with the photoinitiator, the crosslinking agent, the compatibilizer, the defoaming agent and the antioxidant; B. evenly mixing the raw materials in a high mixing machine, and putting the mixture into an extruder for mixing, wherein the temperature of the extruder is controller to be within a range of 80-120 DEG C; C. carrying out tape casting, embossing, cooling, ultraviolet (UV)-curing and prepolymerization to form a film; carrying traction cutting, and finally winding to obtain the EVA adhesive film; D. packaging photovoltaic coated glass, a battery piece or the double-glazed module by means of the quick crosslinked EVA adhesive film for the double-glazed module. The method provided by the invention is easy to implement, simple and convenient to operate and lower in cost, reduces the processing time of the double-glazed module, and does not generate a merged piece; the defoaming agent is adopted as the raw material, so that the module is improved to be free from bubbles, and the yield of double-glazed modules is increased to be more than 99%; the preparation method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic encapsulation film, more specifically relates to a fast cross-linking EVA film for double-glass components, and also relates to a method for preparing a fast-cross-linking EVA film for double-glass components. Improve efficiency and reduce defect rate in the production of glass components. Specifically, it involves EVA through pre-polymerization modification so that the cells and bus bars are not displaced and combined, the defoamer improves the components without bubbles, and the production yield of double-glass components is increased to more than 99%. Background technique [0002] At present, the development of adhesive films for solar cell packaging has begun to take shape in China, and its bonding strength, visible light transmittance, and high-temperature, high-humidity, and UV-aging resistance are all comparable to foreign products. [0003] EVA is ethylene vinyl acetate copolymer, wh...

AI Technical Summary

Problems solved by technology

Long-term practice has proved that it has achieved quite satisfactory results in solar cell encapsulation and outdoor use, but there is no product in the field of fast cross-linking EVA encapsulation film for double-glass modules.

[0004] Although CN103173145A has invented a special EVA adhesive film for encapsulating double-glass solar modules, other ethylene-octene copolymers and polyethylene resins are added, and phase separation will form between EVA and these resins, and the light transmittance and shrinkage will be affected. impact, and cannot fundamentally solve the problems of cell displacement and assembly and component bubbles

CN10413704A has invented a double-glass photovoltaic module structure and packaging method, which uses transparent packaging materials, and the lower layer is non-transparent packaging materials, the scope is too wide, and does not involve the problems of module battery sheet merging, displacement and air bubbles, etc. The key issue

[0005] The above patent scheme has the following two problems: 1. The use of blended resins does not solve the compatibility problem, the lamination time is long, and the efficiency is low. 2. It does not involve solving the problems of cell displacement and assembly in the module and module bubbles question

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