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Aging-resistant EVA film adhesive for solar cell package and method for preparing same

A solar cell and anti-aging technology, which is applied in the direction of chemical instruments and methods, applications, circuits, etc., can solve the problems of insufficient adhesion, poor weather resistance of the film, and influence on light transmittance, etc., to achieve weather aging resistance Good performance, high production efficiency, and good light transmittance

Inactive Publication Date: 2005-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the literature published abroad, the composition and aging performance of EVA film are mainly studied, and the preparation process of EVA film is rarely involved, and the price of EVA film is high.
Domestic studies have also been carried out on EVA solar energy packaging film, and the finished product has been sold in the market, but its effect still cannot fully meet the requirements of solar cell packaging. The more prominent problem is still that the film has poor weather resistance and is easy to turn yellow. Affect its own light transmittance, thereby reducing the photoelectric conversion efficiency of solar modules
In addition, if the PC with good light transmittance, light weight, and good weather aging resistance is used as the upper cover, the current domestic EVA film and PC adhesion cannot meet the requirements, and it is easy to degumming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In terms of parts by mass, 0.25 parts of tackifier γ-aminopropyltriethoxysilane and 1.25 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane were used as Add the joint curing agent to 100 parts of EVA pellets (ethylene-vinyl acetate copolymer) with a VA content of 33% and mix evenly; then add 0.2 parts of β-(4-hydroxy-3,5 di-tert-butylphenyl) N-octadecanyl propionate is used as an antioxidant, 0.1 part of UV light stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate is added to the above mixture, and mixed well . Pour the mixture into an extruder for blending and extrusion, the temperature is controlled at 80°C, and the extruded product is cast, cooled, drawn, and coiled to obtain an EVA film B-1 with a thickness of 0.5mm. The cross-linked EVA film was subjected to thermo-oxidative aging test and ultraviolet light aging test. The condition of the former is 100℃, 720h; the condition of the latter is UVB 313 ultraviolet lamp, the radiation energy is 0.63W / m 2 / ...

Embodiment 2

[0026] Add 0.40 parts of tackifier γ-aminopropyltriethoxysilane and 1.50 parts of crosslinking curing agent 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to 100 parts VA content is mixed uniformly in the EVA pellet of 33%; Then 0.2 part of antioxidant tris (2,4-di-tert-butylphenyl) phosphite, 0.10 part of ultraviolet light stabilizer bis(2,2,6 , 6-tetramethyl-4-piperidinyl) sebacate and 0.05 parts of bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate were added above mixture, and mix well. Pour the mixture into an extruder for blending and extrusion, the temperature is controlled at 85°C, and the extruded product is cast, cooled, drawn, and coiled to obtain an EVA film B-2 with a thickness of 0.5mm. The cross-linked EVA film was subjected to thermo-oxidative aging test and UV aging test. The condition of the former was 100°C, 720h; the condition of the latter was UVB 313 ultraviolet lamp, and the radiation energy was 0.63W / m 2 / nm; exposure conditions, first irradiate...

Embodiment 3

[0028] Add 0.25 parts of tackifier γ-aminopropyltriethoxysilane and 1.00 parts of crosslinking curing agent 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to 100 parts VA content is mixed uniformly in the EVA pellet of 33%; Then 0.2 part of antioxidant tris (2,4-di-tert-butylphenyl) phosphite, 0.2 part of ultraviolet absorber 2-hydroxyl-4-normal Octyloxybenzophenone and 0.1 part of UV light stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate were added to the above mixture and mixed evenly. Pour the mixture into an extruder for blending and extrusion, the temperature is controlled at 83°C, and the extruded product is cast, cooled, drawn, and coiled to obtain an EVA film B-3 with a thickness of 0.5mm. The cross-linked EVA film was subjected to thermo-oxidative aging test and ultraviolet light aging test. The condition of the former is 100℃, 720h; the condition of the latter is UVB 313 ultraviolet lamp, the radiation energy is 0.63W / m 2 / nm; exposure conditions, first irr...

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Abstract

The invention relates to an aging-resistant EVA film adhesive for solar cell package and method for preparation, wherein the preparation constituents include ethane-vinyl acetate copolymer (EVA), cross-linking and curing agent, ultraviolet light absorbent, anti-oxidant, and hindered amine light-stability agent. The preparation comprises the steps of mixing homogeneously, blending extrusion, flow casting the extrudate, cooling down, drawing, and winding.

Description

technical field [0001] The invention relates to a solar cell encapsulation material, in particular to an EVA (ethylene-vinyl acetate copolymer) adhesive film for solar cell encapsulation which is resistant to thermal oxygen and ultraviolet light aging and a preparation method thereof. Background technique [0002] Solar cells are packaged with silicon wafers by means of two layers of polymer packaging films, and then bonded with upper and lower protective layer materials glass and TPT film. First of all, the encapsulation material must be transparent, and the transmittance must be high, so as to ensure that the encapsulated solar cell module has sufficient photoelectric conversion efficiency; in addition, the encapsulation material must have strong adhesive force, so that it can be better fixed and Protect the solar cells; the packaging material must be soft and easy to change shape before curing and packaging, so that it can be packaged according to...

Claims

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Application Information

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IPC IPC(8): C08L23/08H01L31/048
CPCB32B2457/12B32B17/10788B32B17/10678
Inventor 李光吉李连春徐雪青沈辉
Owner SOUTH CHINA UNIV OF TECH
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