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CN-121975447-A - Modified polyolefin elastomer packaging adhesive film and preparation method and application thereof

CN121975447ACN 121975447 ACN121975447 ACN 121975447ACN-121975447-A

Abstract

The invention provides a modified polyolefin elastomer packaging adhesive film, a preparation method and application thereof, wherein the modified polyolefin elastomer packaging adhesive film comprises, by weight, 80-96 parts of a polyolefin elastomer, 0.8-3 parts of a main crosslinking agent, 0.5-3 parts of a secondary crosslinking agent, 0.1-2 parts of silane, 0.2-1 part of an acid absorber and 0.1-1.5 parts of a light stabilizer, and the secondary crosslinking agent comprises polybutadiene compounds. In the invention, the packaging adhesive film has excellent bonding performance, ageing resistance and high volume resistivity, and meanwhile, the packaging adhesive film has low water permeability, high friction coefficient, good barrier performance and anti-skid effect, and the light transmittance of the adhesive film is not affected.

Inventors

  • MIAO LUBIN
  • WANG HAN
  • PENG LIXIA

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
20260505
Application Date
20241025

Claims (10)

  1. 1. The modified polyolefin elastomer packaging adhesive film is characterized by comprising, by weight, 80-96 parts of polyolefin elastomer, 0.8-3 parts of main crosslinking agent, 0.5-3 parts of auxiliary crosslinking agent, 0.1-2 parts of silane, 0.2-1 part of acid absorber and 0.1-1.5 parts of light stabilizer; the auxiliary cross-linking agent comprises polybutadiene compounds.
  2. 2. The modified polyolefin elastomer packaging adhesive film as claimed in claim 1, wherein the polybutadiene-based compound comprises a homopolymer of butadiene and/or a copolymer of butadiene.
  3. 3. The modified polyolefin elastomer packaging adhesive film as claimed in claim 2, wherein the homopolymer of butadiene comprises liquid polybutadiene rubber and/or epoxidized polybutadiene; preferably, the number average molecular weight of the liquid polybutadiene rubber is 1000-8500, more preferably 2000-5000; Preferably, the glass transition temperature of the liquid polybutadiene rubber is-90 to-45 ℃, more preferably-85 to-65 ℃; Preferably, the viscosity of the liquid polybutadiene rubber is 700-15000 cps, more preferably 2000-10000 cps under the condition of 25 ℃; Preferably, the mole percentage of 1, 2-vinyl in the liquid polybutadiene rubber is 25-70%, more preferably 28-58%.
  4. 4. The modified polyolefin elastomer packaging adhesive film as claimed in claim 2, wherein the copolymer of butadiene comprises a liquid styrene-butadiene rubber and/or a butadiene-styrene-divinylbenzene copolymer; preferably, the number average molecular weight of the liquid styrene-butadiene rubber is 3000-9000; Preferably, the glass transition temperature of the liquid styrene-butadiene rubber is-65 to-20 ℃; preferably, the viscosity of the liquid styrene-butadiene rubber is 17000-80000 cps under the condition of 25 ℃; Preferably, the mol percentage of the 1, 2-vinyl in the liquid styrene-butadiene rubber is 25-70%.
  5. 5. The modified polyolefin elastomer packaging adhesive film according to any one of claims 1 to 4, wherein the polybutadiene compound comprises a combination of polybutadiene compound A and polybutadiene compound B, wherein the viscosity of the polybutadiene compound A is smaller than that of the polybutadiene compound B; preferably, the mass ratio of the polybutadiene compound A to the polybutadiene compound B is 1 (1.1-1.8).
  6. 6. The modified polyolefin elastomer of any of claims 1-5, wherein the primary crosslinking agent comprises a peroxide-based crosslinking agent; Preferably, the peroxide cross-linking agent comprises at least one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexyl carbonate, dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide or dicumyl hydroperoxide; Preferably, the method comprises the steps of, the silane comprises at least one of isocyanatopropyl trioxyethyl silane, vinyl triacetoxy silane, vinyl trimethoxy silane, methacryloxypropyl trimethoxy silane or gamma-aminopropyl triethoxy silane.
  7. 7. The modified polyolefin elastomer of any of claims 1-6, wherein the acid acceptor comprises at least one of Mg 4 Al 2 (OH) 12 CO 3 ·3H 2 O、Mg 15 Zn 0.5 Al 2 (OH) 12 CO·3H 2 O、Mg 4.5 Al 2 (OH) 13 CO 3 ·3.5H 2 O、Mg 6 Al 2 (OH) 16 CO 3 ·3H 2 O、Mg 15 Zn 0.5 Al 2 (OH) 12 CO 3 、Mg 6 Al 2 (OH) 16 CO 3 、Mg 4.5 Al 2 (OH) 13 CO 3 ; preferably, the light stabilizer comprises at least one of a polymer of succinic acid and 4-hydroxy-2, 6-tetramethyl-1-piperidinol, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, tris (2, 4-di-tert-butylphenyl) phosphite or 2, 6-tetramethyl-4-piperidyl ester; Preferably, the 2, 6-tetramethyl-4-piperidinyl ester comprises bis (2, 6-tetramethyl-4-piperidinyl) sebacate.
  8. 8. A method for preparing the modified polyolefin elastomer packaging adhesive film according to any one of claims 1 to 7, characterized in that the method comprises the following steps: mixing the polyolefin elastomer, the main crosslinking agent, the auxiliary crosslinking agent, the silane, the acid absorber and the light stabilizer, extruding and casting to obtain the modified polyolefin elastomer packaging adhesive film.
  9. 9. The method according to claim 8, wherein the extrusion casting temperature is 80 to 120 ℃.
  10. 10. A photovoltaic module characterized in that it comprises the modified polyolefin elastomer encapsulating film according to any one of claims 1 to 7.

Description

Modified polyolefin elastomer packaging adhesive film and preparation method and application thereof Technical Field The invention belongs to the technical field of photovoltaic materials, and particularly relates to a modified polyolefin elastomer packaging adhesive film, and a preparation method and application thereof. Background Photovoltaic cells are classified by substrate material and can be classified into P-type cells and N-type cells. The P-type battery refers to a battery piece taking a P-type silicon wafer as a substrate, and the N-type battery refers to a battery piece taking an N-type silicon wafer as a substrate. Since the P-type battery approaches the theoretical efficiency limit, the N-type battery technology is becoming a future development direction. The TOPCon battery piece is a main current N type battery piece which is rapidly developed in the current market, and the TOPCon battery piece becomes a main current choice of the component market in the next few years. Although TOPCon battery pieces have the highest theoretical efficiency of 28.7% and the highest mass production efficiency of 24-25%, and have the advantages of low attenuation, high double-sided rate, low temperature coefficient and the like. However, compared with the conventional battery piece, the front surface of the TOPCon battery piece is made of silver-aluminum paste, and is easy to be corroded by acid, water vapor and the like, so that the generated power of the assembly is attenuated. Therefore, the packaging adhesive film for protecting the battery piece has higher requirements on the performance of the packaging adhesive film, and the packaging adhesive film is required to have the characteristics of low acid, water resistance, strong adhesive property and the like. At present, a packaging adhesive film commonly used for a single glass TOPCon component is a polyolefin elastomer (POE) packaging adhesive film. Because the traditional POE adhesive film is difficult to meet the performance requirements of low acid, high barrier and the like, a crosslinking assistant is generally added into the adhesive film formula, so that the free acid is reduced, the crosslinking density is improved, and the performance requirements of low acid, high barrier of the packaging adhesive film are realized. However, the conventional auxiliary crosslinking system usually adopts triallyl isocyanurate (TAIC) and acrylic ester additives, the compatibility of the two materials and POE is poor, the problem of auxiliary precipitation is easy to generate, the adhesive film is severely slipped, the use of the adhesive film at the end of the component is limited, the production efficiency of the component is seriously affected, an auxiliary layer is easily formed between the POE adhesive film and glass after the auxiliary precipitation, the adhesive effect between the adhesive film and glass cannot be fully exerted, the long-term reliability of the component is reduced, and meanwhile, the conventional auxiliary crosslinking system is poor in ageing resistance and low in volume resistivity, and the long-term reliability of the component is further affected. Therefore, developing a POE packaging adhesive film with low acid, high barrier and anti-skid effects, high bonding strength, good ageing resistance, high volume resistivity and unaffected light transmittance is a problem to be solved in the art. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a modified polyolefin elastomer packaging adhesive film, and a preparation method and application thereof. The modified polyolefin elastomer packaging adhesive film has excellent bonding performance, ageing resistance and high volume resistivity, and meanwhile, the packaging adhesive film is low in water permeability, high in friction coefficient, good in barrier performance and anti-skid effect, and the light transmittance of the adhesive film is not affected, so that the photovoltaic module comprising the packaging adhesive film has higher efficiency and longer service life. To achieve the purpose, the invention adopts the following technical scheme: According to the first aspect, the invention provides a modified polyolefin elastomer packaging adhesive film, which is prepared from, by weight, 80-96 parts of a polyolefin elastomer, 0.8-3 parts of a main crosslinking agent, 0.5-3 parts of a secondary crosslinking agent, 0.1-2 parts of silane, 0.2-1 part of an acid absorber and 0.1-1.5 parts of a light stabilizer, wherein the secondary crosslinking agent comprises a polybutadiene compound. According to the invention, the polybutadiene compound is adopted as the auxiliary crosslinking agent as the raw material of the modified polyolefin elastomer packaging adhesive film, so that the crosslinking density of the packaging adhesive film can be improved, the packaging adhesive film with higher bonding strength, better barrier property, better ageing resista