What raw materials and additives are the main components of EVA photovoltaic film?

Introduction What are the main raw materials and additives of photovoltaic EVA film? EVA is a copolymer of ethylene and vinyl acetate. It is the fourth largest EVA film after HDPE, LDPE and LLDPE.

What raw materials and additives are the main components of EVA photovoltaic film?

EVA is a copolymer of ethylene and vinyl acetate. It is the fourth largest polymer in the ethylene series after HDPE, LDPE and LLDPE. It is a typical statistical copolymer. In its molecular structure, the substituents are arranged irregularly on the molecular chain. At the same time, the asymmetric carbon atoms in the molecular chain have different configurations and irregular arrangements. It is therefore a less crystalline and polar material. flexibility. In addition, it has good wettability when heated and melted, and has good flexibility, stress crack resistance and bonding performance when cooled and solidified.

The properties of EVA mainly depend on its vinyl acetate (VA) content and its melt flow index (MI). When the VA content increases and MI remains unchanged, the transparency increases and the adhesion strength also increases, and theCorresponding properties such as crystallinity, hardness, softening point, stiffness, tensile strength, chemical resistance and resistance to thermal deformation are all the same. Decrease ; when the MI increases and the VA content remains unchanged, that is, the molecular weight of EVA decreases and the melt viscosity, toughness, tensile strength and strength to cracking under corresponding environmental stress all decrease. EVA used for solar cell packaging requires light transmission above 90% and good weather resistance. Currently, EVA materials with VA content of 26-33% are widely used.

Pure EVA itself is a linear polymer, a thermoplastic resin, and does not cross-link to form a three-dimensional network structure. Usually when applying it as adhesive film of inkapsulation, a certain amount of cross-linking agent and co-cross-linking agent must be added to cross-link the molecular chains with each other, thus making them thermoset. The cross-linking and curing process during the encapsulation process is the decomposition of peroxide cross-linker (RO-OM) into free radicals RO· and MO·, which triggers the combination of EVA molecular branched vinyl acetate (VA) to form a three-dimensional network structure, cross-linking and curing of EVA

Advantages, disadvantages and modifications of EVA encapsulation materials

Solar cell modules generally need be used normally for 25 hours. 30 years, and because solar cell modules usually work outdoors, so the environment is relatively harsh, so the requirements for packaging materials are more strict. EVA has the characteristics of ttransparency, softness, hot melt adhesiveness, low melting temperature and good melting fluidity. These characteristics meet the requirements of solar cell packaging materials. However, pure EVA has poor heat and humidity resistance and UV resistance, is prone to aging and yellowing, has poor cohesive strength and poor creep resistance. This will affect the photoelectric conversion efficiency and lifespan of solar cells. to modify EVA to improve molecular structure and weather resistance. The main reason for the aging and yellowing of EVA film is that its molecular chain has a linear structure, composed of carbon-oxygen bonds, carbon-hydrogen bonds, etc. These chemical bonds will break, recombine, or oxidize in humid, outdoor conditions. alternating hot environments and irradiation with ultraviolet lightHead, this produces chromophores, causing the EVA film to yellow and degrade. Current methods of modifying EVA mainly focus on adding cross-linking agents to cross-link it and adding some additives with functions such as antioxidant, UV absorption or stability to the light. The cross-linking agents are generally organic peroxides. During the heating and encapsulation process of solar cells, the adhesive film A will be thermally decomposed to generate free radicals, which will trigger the EVA molecular chains to combine to form a structure of network and increase molecular stability. Added additives such as antioxidants, UV absorption or light stability can generally reduce the oxidative decomposition rate of EVA film, improve anti-aging and UV performance, and reduce the degree of yellowing. crosslinks in the EVA sealant will also react chemically with these additives upon prolonged aging, causing bubbles and yellowing of the adhesive film during use.

EVA is a hot melt adhesive film mainly used in the production of photovoltaic modules. Ordinary photovoltaic modules are placed with tempered glass, EVA, cells, EVA and TPT up and down in the laminator, through suction, heating, pressurization and fusion of EVA, the layers are tightly bonded together to achieve the insulation function. drum sheet from the air.

  • Popular Focus
  • Where is the cheapest battery wholesale?

    Where is the cheapest battery wholesale in Tangxia, Sanyuanli, Baiyun District? There is an enterprise specializing in the independent production of electric vehicles in Tangxia, Sanyuanli, Baiyun District, Baiyun Sanyuanli Avenue, Baiyun Sanyuanli Street
    08-02
  • Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. How to reduce it to 4.8V/4.4A?

    Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. I personally think it is impossible to reduce it to 4.8V/4.4A. Because the discharge platform of lithium batteries is generally set
    08-10
  • What are the materials of the negative electrodes of lithium batteries?

    What are the materials of the negative electrodes of lithium batteries? The main commercial applications of lithium batteries include graphite, which is a sheet of copper used to guide current and which does not react. another safe
    08-02
  • The difference between 18500 and 26500 batteries

    What is the difference between 18500 and 26500 batteries? The answer above is 18650. The person asking the question should ask what is the difference between 18505 and 26500 batteries. In the case of Fuant ER1
    08-02
  • What does 3.7V 80mAh written on a lithium battery mean?

    What does 3.7V 80mAh written on a lithium battery mean? 3.7 V, 80 mA = 0.08 A, H means 1 hour, or 3600 seconds. Taken together, it is
    08-02
  • How long does a lithium battery (cell phone battery) last?

    How long does a lithium battery (cell phone battery) last? The lifespan of mobile phone batteries, under normal conditions of use and without serious impact, the lifespan set by the manufacturer must be 5 years.
    08-02
  • Will lithium batteries explode when charging?

    Will lithium batteries explode when charged? Will lithium batteries explode when charged? Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materi
    08-02
  • Parameters of lgdas31865 lithium battery

    Parameters of lgdas31865 lithium battery The parameters of lgdas31865 lithium battery are as follows: LGDAS31865 is a model 18650 lithium battery with a capacity of
    08-02
  • What are the main components of lithium battery electrolyte?

    What are the main components of lithium battery electrolyte? The composition of lithium battery electrolyte is shown below. 1. Ethylene carbonate: molecular formula C3H4O3. Colorless transparent liquid (>35℃), room temperature
    08-02
  • Who are the lithium battery manufacturers in Shandong?

    What are the lithium battery manufacturers in Shandong? Shandong Shengyang Power Supply Co., Ltd. and Shandong Weineng Environmental Protection Power Technology Co., Ltd. 1. Shandong Shengyang Power Supply Co., Ltd. is located in Shengyang, Qufu City.
    08-02
  • Types of drone batteries available in 2024

    Part 1. Types of drone batteries available in 2024In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in
    07-30
  • How long does it take to charge 26650 battery?

    How long does it take to charge a 26650 battery? The charging time for a 26650 battery is generally between 3 and 6 hours, but the precise time depends on the power of the charger and the capacity of the battery. in general
    08-02
  • For what?Sure, here's an article based on the phrase "For what?

    The simple yet profound question, "For what?" often serves as a gateway to deeper reflections on purpose and intention. It is a query that invites us to delve into the reasons behind actions, decisions, and circumstances that shape our lives and the wor
    08-02
  • Choosing the Right Cart Battery

    This comprehensive guide will walk you through everything you need about cart batteries, from understanding different types to making an informed purchase decision.
    08-02
  • 30mAh~500mAh 3.7 V Li-ion Battery

    Welcome to Ufine's collection of 3.7V lithium-ion batteries ranging from 30mAh to 500mAh. Explore a diverse range of compact and lightweight batteries suitable for various electronic devices,
    08-02
  • Here are 10 essential facts about drone batteries for 2024.

    10 Key Facts About Drone Battery for 2024 In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in the consumer, commercial, and industrial sectors. Below are the primary types of drone batteries avai
    08-02
  • Could you please explain the difference among IMR, ICR, INR, and IFR 18650 batteries?

    What is the Difference Between IMR, ICR, INR, and IFR 18650 Battery?In 18650 batteries, discerning the differences among IMR, ICR, INR, and IFR types is fundamental for tailored and efficient battery usage. These distinct
    08-02
  • Safety considerations for cart batteries

    Selecting the ideal cart battery is crucial for ensuring optimal performance and longevity of your electric vehicle or vaping device. This comprehensive guide w
    08-01