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EVA adhesive film with high water vapor barrier property

A water vapor barrier and adhesive film technology, applied in the direction of adhesives, film/sheet adhesives, non-polymer adhesive additives, etc., can solve the problem of low processing temperature, weak EVA water resistance, and reduced component efficiency. problems, to achieve the effect of enhancing the water vapor barrier performance, improving the heat and humidity resistance performance, and increasing the thermal stability performance

Inactive Publication Date: 2016-06-08
ZHONGTIAN PHOTOVOLTAIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Water vapor is one of the important factors leading to module failure. Water vapor can not only cause hydrolysis of the EVA film, cause delamination and yellowing between EVA and the back sheet, but also induce snail marks, PID and other phenomena, resulting in lower module efficiency. even fail
[0004] Since EVA itself contains ester bonds that are easy to hydrolyze, the water resistance of EVA is generally weak. It is urgent to develop a high water resistance EVA. At present, the most common way to improve the water resistance of modules is to increase the thickness of the backsheet, or The backplane is coated with a water-blocking layer. These methods will not only increase the production cost of the backplane, but also make the lamination process more complicated.
Some EVA manufacturers add hydrophobic polyolefin materials to EVA, but the water blocking effect is not ideal, and EVA contains a cross-linking agent, so the processing temperature is low, and polyolefin has a high melting point, which is difficult to process at low processing temperatures. Evenly dispersed in EVA

Method used

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  • EVA adhesive film with high water vapor barrier property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 100 parts of EVA resin with a vinyl acetate content of 28%, 1.0 parts of dicumyl peroxide, 0.5 parts of 3-allyl isocyanurate, β-3,5-di-tert-butyl-4-hydroxyphenyl ) n-octadecyl propionate, 0.5 parts of 2,2'-dihydroxy-4-methoxybenzophenone, .2 parts of bis(2,2,6,6-tetramethyl-4-piperidine base) sebacate, 0.5 parts of acetyl trimethylsilane, 3 parts of talc powder are mixed evenly through a mixer, put into a casting machine, and plasticized at 110°C for extrusion, stretching, traction, and winding Form an EVA film with a thickness of about 0.5mm.

Embodiment 2

[0035] 100 parts of EVA resin with a vinyl acetate content of 28%, 1.0 parts of dicumyl peroxide, 0.5 parts of 3-allyl isocyanurate, β-3,5-di-tert-butyl-4-hydroxyphenyl ) n-octadecyl propionate, 0.5 parts of 2,2'-dihydroxy-4-methoxybenzophenone, .2 parts of bis(2,2,6,6-tetramethyl-4-piperidine base) sebacate, 0.5 parts of acetyl trimethylsilane, 10 parts of talc powder are mixed evenly through a mixer, put into a casting machine, and plasticized, extruded, stretched, drawn, and rolled at 110 ° C. Form an EVA film with a thickness of about 0.5mm.

Embodiment 3

[0037] 100 parts of EVA resin with a vinyl acetate content of 28%, 1.0 parts of dicumyl peroxide, 0.5 parts of 3-allyl isocyanurate, β-3,5-di-tert-butyl-4-hydroxyphenyl ) n-octadecyl propionate, 0.5 parts of 2,2'-dihydroxy-4-methoxybenzophenone, .2 parts of bis(2,2,6,6-tetramethyl-4-piperidine Base) sebacate, 0.5 parts of acetic trimethylsilane, 15 parts of talc powder are mixed evenly through a mixer, put into a casting machine, and plasticized at 110°C for extrusion, stretching, traction, and winding. Form an EVA film with a thickness of about 0.5mm.

[0038] prior art embodiment

[0039] In 100 parts by mass of EVA resin with a vinyl acetate content of 28%, 1.0 parts of dicumyl peroxide, 0.5 parts of 3-allyl isocyanurate, β-3,5-di-tert-butyl-4-hydroxybenzene base) n-octadecyl propionate, 0.5 parts of 2,2'-dihydroxy-4-methoxybenzophenone, .2 parts of bis(2,2,6,6-tetramethyl-4-piper Pyridyl) sebacate, 0.5 parts of acetoxytrimethylsilane are mixed evenly by a mixer, put int...

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PUM

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Abstract

The invention discloses an EVA adhesive film with the high water vapor barrier property. The EVA adhesive film is prepared from, by weight, 100 parts of EVA resin, 0.1-5 parts of a cross-linking agent, 0.1-1 part of an antioxidant, 0.3-1 part of an ultraviolet screening agent, 0.3-0.7 part of a light stabilizer and 1-20 parts of lamella packing, wherein the lamella packing is one of sericite, talcum powder, glass flake and mica. The EVA adhesive film with the high water vapor barrier property has good ultraviolet resistance and good main mechanical properties such as tensile strength and tear strength, and can have the good compatibility with other photovoltaic packaging materials and lamination technologies.

Description

technical field [0001] The invention relates to a photovoltaic module packaging material, in particular to an EVA adhesive film with high water vapor barrier. Background technique [0002] With the depletion of traditional fossil fuels, human beings are constantly looking for new energy alternatives. Solar energy is currently recognized as a green and renewable resource. At present, the most common solar photovoltaic module structures on the market are photovoltaic tempered glass, high-transparency EVA, battery sheet, high-insulation EVA and photovoltaic backsheet / glass, among which EVA is mainly It is used for bonding between the materials of battery sheet, glass and back sheet in the module. A good EVA should have the characteristics of high adhesion, high light transmittance, high water vapor penetration, high temperature resistance, and anti-ultraviolet aging, so as to ensure the long-term stable and efficient operation of battery components. [0003] Water vapor is on...

Claims

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Application Information

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IPC IPC(8): C09J7/00C09J123/08C09J11/04C09J11/06
CPCC09J7/00C08K3/34C08K5/132C08K5/1345C08K5/14C08K13/02C08L2201/08C08L2201/14C08L2203/206C09J11/04C09J11/06C09J123/08C09J2203/326
Inventor 张宪哲沙锐杨继明陈坤刘香安王怀伟王同心蒋贤明王强
Owner ZHONGTIAN PHOTOVOLTAIC MATERIALS
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