CN-121991597-A - Low-corrosion type white EVA packaging adhesive film and preparation method and application thereof

CN121991597ACN 121991597 ACN121991597 ACN 121991597ACN-121991597-A

Abstract

The invention provides a low-corrosion type white EVA packaging adhesive film, and a preparation method and application thereof, wherein the low-corrosion type white EVA packaging adhesive film comprises a first low-acid layer, a main EVA layer and a second low-acid layer which are sequentially laminated; the preparation raw materials of the first low-acid layer comprise conventional EVA particles, low-acid EVA particles and an auxiliary agent, the preparation raw materials of the main EVA layer comprise conventional EVA particles, titanium dioxide and an auxiliary agent, and the preparation raw materials of the second low-acid layer comprise conventional EVA particles, low-acid EVA particles, an acid absorber and an auxiliary agent. According to the white EVA packaging adhesive film provided by the invention, the first low-acid layer and the second low-acid layer are arranged on the two sides of the main EVA layer, and the acid absorbing agent is introduced into the second low-acid layer, so that the packaging adhesive film has lower corrosiveness.

Inventors

WANG HAN
MIAO LUBIN
HE PEIYAO
LI JINGJING

Assignees

嘉兴优固应用材料有限公司
阿特斯阳光电力集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (10)

1. The low-corrosion type white EVA packaging adhesive film is characterized by comprising a first low-acid layer, a main EVA layer and a second low-acid layer which are sequentially laminated; the preparation raw materials of the first low-acid layer comprise conventional EVA particles, low-acid EVA particles and auxiliary agents; the preparation raw materials of the main EVA layer comprise conventional EVA particles, titanium dioxide and an auxiliary agent; the preparation raw materials of the second low-acid layer comprise conventional EVA particles, low-acid EVA particles, an acid absorber and an auxiliary agent.
2. The low corrosion white EVA packaging adhesive film according to claim 1, wherein the auxiliary agents in the first low acid layer, the bulk EVA layer, and the second low acid layer each independently comprise any one or a combination of at least two of a cross-linking agent, an auxiliary cross-linking agent, an acrylate, a tackifier, and a light stabilizer.
3. The low corrosion type white EVA packaging adhesive film according to claim 1 or 2, wherein the raw materials for preparing the first low acid layer comprise the following components in parts by weight: preferably, the preparation raw materials of the main EVA layer comprise the following components in parts by weight: preferably, the preparation raw materials of the second low-acid layer comprise the following components in parts by weight:
4. The low corrosion white EVA packaging adhesive film according to claim 2 or 3, wherein the crosslinking agent comprises any one or a combination of at least two of t-butyl peroxy-2-ethylhexyl carbonate, t-amyl peroxy-2-ethylhexyl carbonate, methyl ethyl ketone peroxide, benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide; Preferably, the auxiliary crosslinking agent comprises any one or a combination of at least two of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate and triethylene glycol methacrylate; Preferably, the acrylic acid ester comprises any one or a combination of at least two of propoxytrimethacrylate, trimethylolpropane triacrylate, polyethylene glycol diacrylate and tricyclodecane dimethanol diacrylate; Preferably, the method comprises the steps of, the tackifier comprises gamma-methacryloxypropyl trimethoxysilane gamma-methacryloxypropyl triethoxysilane, 3- (methacryloxyyl) propyl triethoxysilane any one or a combination of at least two of 3- (methacryloxy) propyl trimethoxy silane, vinyl trimethoxy silane and vinyl triethoxy silane; Preferably, the method comprises the steps of, the light stabilizer comprises bis (2, 6-tetramethyl-4-piperidyl) sebacate, poly (4-hydroxy-2, 6-tetramethyl-1-piperidylethanol) succinate bis-2, 6-tetramethyl piperidinol sebacate or hindered amine light stabilizer any one or a combination of at least two of 1,3, 5-trimethyl-2, 4, 6-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, tri (2, 4-di-tert-butylphenyl) phosphite and 2, 6-tetramethyl-4-piperidinyl ester.
5. The low corrosion white EVA packaging film according to any one of claims 1 to 4, wherein the titanium dioxide comprises rutile titanium dioxide produced by the commercially available conventional sulfuric acid process or chloride process.
6. The low corrosion white EVA packaging film according to any one of claims 1 to 5, wherein the acid acceptor comprises hydrotalcite; Preferably, the VA content of the conventional EVA particles in the first low-acid layer, the main EVA layer and the second low-acid layer is 25-30% respectively, and the melt index is 20-30g/10min respectively; preferably, the VA content of the low-acid EVA particles in the first low-acid layer is 16-18%, and the melt index is 10-15g/10min; preferably, the VA content of the low-acid EVA particles in the second low-acid layer is 3-15%, and the melt index is 2-5g/10min.
7. The low corrosion white EVA packaging film according to any one of claims 1 to 6, wherein the thickness of the first low acid layer is 0.1 to 0.15mm; preferably, the thickness of the main EVA layer is 0.4-0.5mm; Preferably, the thickness of the second low acid layer is 0.1-0.15mm.
8. A method for preparing the low corrosion white EVA packaging adhesive film according to any one of claims 1 to 7, comprising the steps of: And respectively mixing the preparation raw materials of the first low-acid layer, the main EVA layer and the second low-acid layer, then carrying out tape casting and coextrusion, and carrying out post-treatment to obtain the low-corrosion white EVA packaging adhesive film.
9. The method of claim 8, wherein the post-treatment comprises cooling, trimming, and rolling.
10. Use of the low corrosion white EVA encapsulant film of any one of claims 1-7 in a photovoltaic module.

Description

Low-corrosion type white EVA packaging adhesive film and preparation method and application thereof Technical Field The invention belongs to the technical field of solar cells, and relates to a low-corrosion white EVA (ethylene-vinyl acetate copolymer) packaging adhesive film, and a preparation method and application thereof. Background The photovoltaic power generation is taken as one of important parts of new energy, the technology is developed and mature in recent years, the photovoltaic module consists of 8 parts of auxiliary materials, the battery piece can carry out photovoltaic power generation, the other 7 auxiliary materials are taken as core components and are updated around the iteration of the battery piece technology, currently, the technology iteration is carried out on the market mainly by TOPCon battery technology, the battery piece slurry is firstly subjected to Ag/Al composite slurry, the conventional EVA packaging adhesive film corrodes the battery piece slurry, and POE is adopted for packaging, but after the updating based on LECO technology, the slurry is changed into Ag, and the Ag is inert metal, so that the battery piece can be packaged by EVA, the relative corrosiveness is reduced, and the cost of packaging materials is also reduced. At present TOPCon, the back of the battery generally adopts a white EVA packaging technology, can reflect certain sunlight so as to increase the power generation efficiency of the component, but as the service life of the photovoltaic component increases, VA groups in EVA are decomposed into acetic acid so as to corrode a battery piece, and the existence of white EVA filler titanium dioxide can accelerate the corrosion of the battery piece, so that the power of the component is attenuated, the service life of the component is reduced, in addition, due to the existence of titanium dioxide, the specific surface energy of a film is low, and as the service life increases, the layering failure risk exists, so that the adhesive force with a back plate or glass is reduced, so that the development of the high-performance white EVA packaging film suitable for TOPCon single/double-glass components is significant. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a low-corrosion white EVA packaging adhesive film, and a preparation method and application thereof. The low corrosion type white EVA packaging adhesive film provided by the invention is a three-layer co-extrusion type EVA adhesive film, is suitable for packaging single/double glass components by LECO technology TOPCon, and compared with a conventional white EVA packaging adhesive film, has relatively reduced acetic acid content after aging, and has low corrosion and obviously improved DH (Damp-heat) aging resistance. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the invention provides a low-corrosion type white EVA packaging adhesive film, which comprises a first low-acid layer, a main EVA layer and a second low-acid layer which are sequentially stacked; the preparation raw materials of the first low-acid layer comprise conventional EVA particles, low-acid EVA particles and auxiliary agents; the preparation raw materials of the main EVA layer comprise conventional EVA particles, titanium dioxide and an auxiliary agent; the preparation raw materials of the second low-acid layer comprise conventional EVA particles, low-acid EVA particles, an acid absorber and an auxiliary agent. In actual use, the first low acid layer is adjacent to one side of the glass or back plate and the second low acid layer is adjacent to one side of the battery plate. According to the white EVA packaging adhesive film provided by the invention, the first low-acid layer adopts the low-acid EVA particles (EVA particles with low VA content) and the conventional EVA particles to be mutually doped, so that VA decomposition of the adhesive film after wet and heat aging can be reduced, the proportion of acetic acid penetrating into the main EVA layer and the second low-acid layer is reduced, and as the main EVA layer contains the colored mother powder, the specific surface energy is low, and the layering failure risk is caused along with the increase of the service life, the first low-acid layer also has the effect of improving the adhesive force between the adhesive film and the backboard/glass. According to the white EVA packaging adhesive film provided by the invention, the EVA particles with lower VA content and the conventional EVA particles are adopted for the second low-acid layer to be mutually doped, so that VA decomposition of the adhesive film after wet and heat aging can be reduced, and thus the risk of corrosion of a battery piece is reduced; The other function of the second low-acid layer is that the fluidity of the upper and lower adhesive films is reduced by adding a certain proportion of low-melt resin parti