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CN-121975451-A - Low-auxiliary-agent-migration multilayer packaging adhesive film, preparation method thereof and packaging adhesive film crosslinked cured product

CN121975451ACN 121975451 ACN121975451 ACN 121975451ACN-121975451-A

Abstract

The invention belongs to the technical field of photovoltaic module packaging materials, and particularly relates to a low-auxiliary-agent-migration multilayer packaging adhesive film, a preparation method thereof and a packaging adhesive film crosslinked cured product. The multilayer packaging adhesive film comprises a POE layer and an EVA/POE blending layer arranged on the surface of one side or two sides of the POE layer, wherein the POE layer comprises POE resin, a main crosslinking agent, an auxiliary crosslinking agent and a silane coupling agent, and the EVA/POE blending layer comprises EVA resin, POE resin, acrylic ester, a compatilizer, a main crosslinking agent, an auxiliary crosslinking agent, a silane coupling agent and an antioxidant. The multilayer packaging adhesive film provided by the invention has excellent comprehensive performance under the condition of keeping low auxiliary agent migration.

Inventors

  • LIU PENG
  • ZHANG LI
  • ZHAO YONGCHEN
  • HUANG YUANDAN
  • ZHAO YIBO
  • ZHAO KAIKAI

Assignees

  • 海南贝欧亿科技有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (10)

  1. 1. The low-auxiliary migration multilayer packaging adhesive film is characterized by comprising a POE layer and an EVA/POE blending layer arranged on the surface of one side or two sides of the POE layer; the POE layer comprises POE resin, a main cross-linking agent, an auxiliary cross-linking agent and a silane coupling agent; The EVA/POE blending layer comprises EVA resin, POE resin, acrylic ester, a compatilizer, a main cross-linking agent, a secondary cross-linking agent, a silane coupling agent and an antioxidant; The POE resin is prepared by copolymerizing ethylene and alpha-olefin, wherein the alpha-olefin is one or more of 1-butene, 1-octene and 1-hexene, the alpha-olefin insertion rate of the POE resin is 10-30wt%, the melt index of the POE resin measured under the conditions of 190 ℃ and 2.16kg load is 2-20 g/10min, the number average molecular weight of the POE resin is 100000-250 g/mol, the molecular weight distribution index of the POE resin is 2-4, and the density of the POE resin is 0.6-0.9 g/cm 3 .
  2. 2. The low-aid migration multilayer packaging film according to claim 1, wherein the acrylic acid ester is one or more of 1, 6-hexanediol diacrylate, ethoxylated 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, ethylene glycol dimethacrylate, 2-methyl-1, 3-propanediol diacrylate, ethoxylated 2-methyl-1, 3-propanediol diacrylate and ethoxylated trimethylolpropane triacrylate.
  3. 3. The low-aid migration multilayer packaging adhesive film according to claim 1, wherein the compatibilizer is one or more of styrene grafted polyethylene, styrene grafted polypropylene, maleic anhydride grafted acrylonitrile-butadiene-styrene polymer, maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted polyolefin elastomer, glycidyl methacrylate grafted polyolefin elastomer, and ethylene-acrylic acid copolymer.
  4. 4. The low-aid migration multilayer packaging adhesive film according to claim 1, wherein the main crosslinking agent is one or more of tert-butylperoxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexanoate, 1-bis (tert-butyl peroxide) -3, 5-trimethylcyclohexane, dicumyl peroxide, di-tert-butylperoxycumene and 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane; And/or the auxiliary cross-linking agent is one or more of triallyl isocyanurate, ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate and diallyl 1, 2-phthalate.
  5. 5. The low-aid migration multilayer packaging adhesive film according to claim 1, wherein the silane coupling agent is one or more of γ -methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, and vinyl tris (2-methoxyethoxy) silane.
  6. 6. The low-aid migration multilayer packaging adhesive film according to claim 1, wherein the antioxidant is one or more of n-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 2, 6-di-tert-butyl-4-methylphenol, butylated hydroxyanisole, dilauryl thiodipropionate, 1, 6-hexanediol-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propylene diester, triethylene glycol-bis-3- (2-tert-butyl-4-hydroxy-5-methyl-phenyl) acrylic acid, pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], bisdodecyl thiodipropionate, triphenyl phosphite, bisoctadecyl pentaerythritol phosphate, trisnonylphenyl phosphite and diphenyl-octyl phosphite.
  7. 7. The low-auxiliary migration multilayer packaging adhesive film according to claim 1, wherein the POE layer comprises the following components in parts by weight: 100 parts of POE resin; 0.3-1 parts of a main cross-linking agent; 0.5-1.1 parts of auxiliary cross-linking agent; 0.3-0.8 parts of silane coupling agent.
  8. 8. The low-auxiliary migration multilayer packaging adhesive film according to claim 1, wherein the EVA/POE blend layer comprises, in parts by weight: 100 parts of EVA resin; 1-20 parts of POE resin; 0.6-0.8 part of acrylic ester; 1-20 parts of a compatilizer; 0.6-1 part of main cross-linking agent; 0.5-1.1 parts of auxiliary cross-linking agent; 0.6-0.8 parts of silane coupling agent; 0.05-3 parts of an antioxidant.
  9. 9. A method for preparing the low-auxiliary migration multilayer packaging adhesive film according to any one of claims 1 to 8, which is characterized by comprising the following steps: preparing POE layer mixture and EVA/POE blending layer mixture respectively; and preparing a multilayer structure by taking the POE layer mixture and the EVA/POE blending layer mixture as raw materials to obtain the low-auxiliary-agent migration multilayer packaging adhesive film.
  10. 10. The crosslinked and cured product of the packaging adhesive film is characterized in that the crosslinked and cured product of the packaging adhesive film is a product obtained by crosslinking the low-auxiliary-agent-migration multilayer packaging adhesive film prepared by the preparation method of any one of claims 1 to 8 or the low-auxiliary-agent-migration multilayer packaging adhesive film prepared by the preparation method of claim 9.

Description

Low-auxiliary-agent-migration multilayer packaging adhesive film, preparation method thereof and packaging adhesive film crosslinked cured product Technical Field The invention belongs to the technical field of photovoltaic module packaging materials, and particularly relates to a low-auxiliary-agent-migration multilayer packaging adhesive film, a preparation method thereof and a packaging adhesive film crosslinked cured product. Background The photovoltaic solar energy is used as one of clean low-carbon, environment-friendly and efficient green energy, and the photovoltaic solar energy is converted into dominant energy in an accelerating way. The photovoltaic packaging adhesive film is arranged between the glass and the solar cell or between the backboard and the solar cell of the photovoltaic module, is used for packaging and protecting the solar cell, is one of key materials of the photovoltaic module, and plays a vital role in improving and guaranteeing the quality of the photovoltaic module. Currently, the main stream adhesive film in the market is mainly an EVA adhesive film, wherein the POE adhesive film and EVA and POE form an EVA/POE/EVA multilayer coextrusion adhesive film (EPE adhesive film) in a multilayer coextrusion mode. The EPE adhesive film has the characteristics of low water vapor transmittance of POE, better PID resistance, high adhesion of EVA and the like, and solves the technical problems that a pure POE adhesive film slips and is easy to generate bubbles, the water vapor transmittance of the pure EVA adhesive film is higher, and potential induced attenuation (PID) is caused by acetate ions hydrolyzed in the EVA, so that the output power of a battery is seriously affected. However, because the molecular weight of POE is saturated and no polar monomer is contained, and EVA is a polar molecule and has good compatibility with an auxiliary agent, the polar auxiliary agent in the POE layer is easy to migrate to the EVA layer in the long-term use process, so that the crosslinking degree of the middle POE layer is reduced, the ageing speed of the EPE adhesive film is too high, the problem of layering between the EVA adhesive film layer and the POE adhesive film layer is caused, and the adhesive film performance is reduced. Disclosure of Invention In view of the above, the present invention aims to provide a low-auxiliary-migration multilayer packaging adhesive film, a preparation method thereof and a crosslinked cured product of the packaging adhesive film. The invention provides a low-auxiliary-agent-migration multilayer packaging adhesive film, which comprises a POE layer and an EVA/POE blending layer arranged on the surface of one side or both sides of the POE layer; the POE layer comprises POE resin, a main cross-linking agent, an auxiliary cross-linking agent and a silane coupling agent; The EVA/POE blending layer comprises EVA resin, POE resin, acrylic ester, a compatilizer, a main cross-linking agent, a secondary cross-linking agent, a silane coupling agent and an antioxidant; The POE resin is prepared by copolymerizing ethylene and alpha-olefin, wherein the alpha-olefin is one or more of 1-butene, 1-octene and 1-hexene, the alpha-olefin insertion rate of the POE resin is 10-30wt%, the melt index of the POE resin measured under the conditions of 190 ℃ and 2.16kg load is 2-20 g/10min, the number average molecular weight of the POE resin is 100000-250 g/mol, the molecular weight distribution index of the POE resin is 2-4, and the density of the POE resin is 0.6-0.9 g/cm 3. Preferably, the acrylic acid ester is one or more of 1, 6-hexanediol diacrylate, ethoxylated 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, ethylene glycol dimethacrylate, 2-methyl-1, 3-propanediol diacrylate, ethoxylated 2-methyl-1, 3-propanediol diacrylate and ethoxylated trimethylolpropane triacrylate. Preferably, the compatilizer is one or more of styrene grafted polyethylene, styrene grafted polypropylene, maleic anhydride grafted acrylonitrile-butadiene-styrene polymer, maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted polyolefin elastomer, glycidyl methacrylate grafted polyolefin elastomer and ethylene-acrylic acid copolymer. Preferably, the primary crosslinking agent is one or more of tert-butylperoxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexanoate, 1-bis (tert-butyl peroxy) -3, 5-trimethylcyclohexane, dicumyl peroxide, di-tert-butylperoxycumene and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane; And/or the auxiliary cross-linking agent is one or more of triallyl isocyanurate, ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate and diallyl 1, 2-phthalate. Preferably, the silane coupling agent is one or more of gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, and vinyl tris (2-methoxyethoxy) silane. Preferably, the antioxidant is one or more of n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyp