EVA (Ethylene Vinyl-Acetate) packaging glue film with high gas-water barrier property and preparation method thereof

A water vapor barrier and encapsulation film technology, which is applied in the direction of adhesives, polymer adhesive additives, film/sheet adhesives, etc., can solve the problems of fading, discoloration, and photoelectric conversion efficiency reduction of photovoltaic modules, and achieve good results. The effects of moisture and heat aging resistance, good water vapor barrier performance, and good hydrolysis resistance

Inactive Publication Date: 2014-04-30
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The EVA film will degrade during long-term outdoor use, causing aging phenomena such as discoloration, fading, delamination, generation of acetic acid and corrosion of electrodes.
In addition to being irradiated by ultraviolet light, EVA film may also be exposed to harsh environments with high temperature and humidity
EVA that has been exposed to high temperature and high humidity for a long time will undergo hydrolysis reactions, resulting in bubbles, yellowing, delamination, etc., resulting in a significant decrease in the photoelectric conversion efficiency of photovoltaic modules.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1.0 parts of initiator 3,3-di(tert-butylperoxy) ethyl butyrate, 0.5 part of triallyl isocyanurate, 0.3 part β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, 0.3 parts of 2-hydroxy-4-n-octyloxybenzophenone, 0.2 parts of bis(2, 2,6,6-Tetramethyl-4-piperidinyl) sebacate, 0.5 parts of vinyl tris(β-methoxyethoxy)silane, 2 parts of zinc methacrylate are mixed uniformly through a mixer , put it into the casting machine, and make an EVA film with a thickness of about 0.5mm after plasticizing, extruding, stretching, pulling, and winding at 115°C. EVA film volume resistivity: 3×10 15 Ω·cm, water vapor transmission rate (38℃ / 90%RH): 5.6G / (m 2 ·d), damp heat aging resistance (RH85%, 85°C, 1000h): yellowing index (ΔYI): 1.7.

Embodiment 2

[0026] Add 1.0 parts of initiator 3,3-di(tert-butylperoxy) ethyl butyrate, 0.5 part of triallyl isocyanurate, 0.3 part β-3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, 0.3 parts of 2-hydroxy-4-n-octyloxybenzophenone, 0.2 parts of bis(2,2 , 6,6-tetramethyl-4-piperidinyl) sebacate, 0.5 parts of vinyltrimethoxysilane, 1 part of zinc stearate are mixed uniformly through a mixer, put into the tape casting machine, at 115 ℃After plasticizing, extruding, stretching, pulling, and winding, it is made into an EVA film with a thickness of about 0.5mm. EVA film volume resistivity: 5×10 15 Ω·cm, water vapor transmission rate (38℃ / 90%RH): 4.8G / (m 2 ·d), damp heat aging resistance (RH85%, 85°C, 1000h): yellowing index (ΔYI): 1.8.

Embodiment 3

[0028] Add 1.0 parts of initiator peroxy 2-ethylhexyl carbonate tert-butyl carbonate, 0.5 parts of triallyl isocyanurate, 0.3 parts of β-3,5 in 100 parts by mass of EVA raw materials with a vinyl acetate content of 28%. -n-octadecyl di-tert-butyl-4-hydroxyphenyl)propionate, 0.3 parts of 2-hydroxy-4-n-octyloxybenzophenone, 0.2 parts of bis(2,2,6,6- Tetramethyl-4-piperidinyl) sebacate, 0.5 parts of vinyltrimethoxysilane, 10 parts of polyolefin elastomer POP are mixed evenly through a mixer, put into a casting machine, and plasticized at 115 ° C Extrude, stretch, pull, and roll to make an EVA film with a thickness of about 0.5mm. EVA film volume resistivity: 8×10 15 Ω·cm, water vapor transmission rate (38℃ / 90%RH): 3.5G / (m 2 ·d), damp heat aging resistance (RH85%, 85°C, 1000h): yellowing index (ΔYI): 1.5.

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Abstract

The invention discloses an EVA (Ethylene Vinyl-Acetate) packaging glue film with high gas-water barrier property and a preparation method thereof. The glue film is prepared from the following raw materials in parts by weight: 100 parts of an EVA copolymer, 0.5-5 parts of a crosslinking agent, 0.1-0.5 part of an antioxidant, 0.1-0.5 part of an ultraviolet absorber, 0.05-0.5 part of a light stabilizer, 0.1-3 parts of a silane coupling agent and 0.01-55 parts of a water resistant. The preparation method comprises the following steps: plastifying and extruding; stretching; drawing; rolling and the like. The glue film disclosed by the invention has the beneficial effects that the EVA glue film obtained by the invention has good gas-water barrier property and hydrolysis resistance as well as better damp-heat aging resistance.

Description

technical field [0001] The invention relates to an EVA adhesive film, in particular to an EVA packaging adhesive film with high water vapor barrier property, which is mainly used in the field of photovoltaic module packaging. Background technique [0002] The EVA adhesive film for solar cell encapsulation is based on EVA resin, added with various modification additives, and melted and extruded by a screw extruder. It is a thermosetting adhesive film with the characteristics of anti-ultraviolet, anti-aging and yellowing, and high peel strength. . It is mainly used for the packaging of solar cell components, which can improve the light transmittance of the cell components, prevent water vapor penetration, high and low temperature resistance, and anti-ultraviolet aging, etc., to ensure the long-term stable and efficient use of the cell components. [0003] The EVA film will degrade during long-term outdoor use, and there will be aging phenomena such as discoloration, fading, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J123/08C09J11/06C09J11/08H01L31/048
CPCY02E10/50
Inventor 赵世界陈坤
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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