CN116135941A - Adhesive film for photovoltaic packaging and preparation method thereof - Google Patents

Adhesive film for photovoltaic packaging and preparation method thereof Download PDF

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Publication number
CN116135941A
CN116135941A CN202310254456.XA CN202310254456A CN116135941A CN 116135941 A CN116135941 A CN 116135941A CN 202310254456 A CN202310254456 A CN 202310254456A CN 116135941 A CN116135941 A CN 116135941A
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resin
adhesive film
poe
parts
pvb
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CN202310254456.XA
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Inventor
王远震
吴赛
吴雷
叶青
李宜忠
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Jiangsu Huaxin New Material Co ltd
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Jiangsu Huaxin New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
    • C09J129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2429/00—Presence of polyvinyl alcohol
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Wrappers (AREA)

Abstract

The adhesive film for the photovoltaic packaging and the preparation method thereof comprise the following components in parts by weight: 10-40 parts of POE resin, 60-90 parts of PVB resin, 5-20 parts of POE grafted maleic anhydride, 1-10 parts of CBT resin and 0.3-0.7 part of efficient lubricant. The preparation method comprises the following steps: uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and efficient lubricant according to a proportion to obtain a mixture, and drying the mixture at 60-80 ℃ for 4-6 hours to ensure that the water content of the mixture is less than 100PPM; and (3) putting the dried mixture into an extruder for plasticizing, adding CBT resin into the side feed of a screw homogenization section, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material. The preparation process is simple and feasible; the prepared photovoltaic packaging adhesive film has excellent packaging adhesive property, no plasticizer precipitation and excellent ageing resistance.

Description

Adhesive film for photovoltaic packaging and preparation method thereof
Technical Field
The invention relates to the technical field of adhesive films for photovoltaic packaging, in particular to an adhesive film for photovoltaic packaging and a preparation method thereof.
Background
Perovskite solar cells are a new type of solar cells that use perovskite organometallic halide semiconductors as light absorbing materials. Perovskite materials, such as lead methylammonium halides and all-inorganic cesium halides, are inexpensive to produce and easy to manufacture. Perovskite solar cells have the potential to achieve higher efficiency and extremely low production costs, with perovskite solar cells being the fastest growing solar technology at present. However, a major challenge of perovskite solar cells is short-term and long-term stability, the instability of which is mainly related to environmental influences (moisture and oxygen), thermal stress and inherent stability of perovskite based on methylammonium, which is subject to mechanical brittle failure when heated under an applied voltage, due to water, steam, uv light. Therefore, oxygen resistance and water resistance are important for popularization and use of perovskite solar cells.
The photovoltaic packaging adhesive film is a bonding material among glass, a battery and a backboard in the photovoltaic module and is positioned on the upper side and the lower side of the battery piece, and the main functions comprise bonding, protection and insulation. Therefore, the photovoltaic adhesive film needs to have the characteristics of good cohesiveness, high light transmittance, ultraviolet resistance, damp-heat yellowing resistance, oxygen resistance, water resistance and the like. At present, the photovoltaic adhesive film is mainly divided into EVA adhesive film, POE adhesive film, PVB adhesive film and the like.
EVA adhesive film is the mainstream packaging material at present, and the processing property is good, supply is more abundant, but stability is poor. The vinyl acetate groups enable the EVA adhesive film to be degraded and aged easily due to ultraviolet light and wet heat oxidation, and the adhesive film is yellowing and delamination, so that the assembly efficiency and the service life are affected. The vinyl acetate group in the EVA material has hydrophilicity, EVA is easy to hydrolyze to produce acetic acid after water vapor at the edge of the component enters, the acetic acid reacts with glass to generate a large amount of sodium ions which move freely, the sodium ions on the surface of the glass migrate to the surface of the battery through the packaging material and carry out electric corrosion reaction with silver grid lines on the surface of the battery piece, so that the battery grid lines are corroded, the series resistance is increased, and the performance of the component is attenuated.
The POE adhesive film has the characteristics of low water vapor permeability, high volume resistivity and good PID resistance, meets the packaging requirement of an N-type component better, but has poor processing property and limited POE resin supply. The POE resin is a nonpolar material, the adhesive property is poor compared with EVA, the additive added in the conventional preparation of the adhesive film is basically a polar additive, the compatibility with the POE resin is poor, the POE adhesive film has a series of processing problems of additive precipitation, easy bubble generation and the like in application, the lamination yield of the assembly is low, the surface of the POE adhesive film is smooth and easy to shift, and the production efficiency of the assembly is affected.
The PVB adhesive film is an adhesive film which is formed by taking PVB resin (polyvinyl butyral) as a main raw material and adding a large amount of plasticizer for modification and melt processing, and has the advantages of excellent mechanical strength, high safety and strong adhesive property. Patent CN107681015a discloses a preparation method of a PVB photovoltaic film, but the addition of a large amount of plasticizer causes poor stability, and migration of the plasticizer affects adhesion and water resistance, so that the PVB photovoltaic film is difficult to be applied to a traditional assembly. CN111834481a discloses a way of stacking and combining PVB/POE to improve the performance of the product, but this way still fails to solve the problem of stability of both, and migration of plasticizer and auxiliary agent affects the service life of the product. The combination of POE film and butyl rubber is considered as the most effective way of perovskite encapsulation, but the coating of butyl rubber increases the process and the reject ratio.
Disclosure of Invention
The invention aims to provide a glue film for photovoltaic packaging and a preparation method thereof, and the preparation process is simple and easy to implement; the prepared photovoltaic packaging adhesive film has excellent packaging adhesive property, no plasticizer precipitation and excellent ageing resistance.
In order to achieve the purpose, the invention provides a photovoltaic packaging adhesive film which comprises the following components in parts by weight: 10-40 parts of POE resin, 60-90 parts of PVB resin, 5-20 parts of POE grafted maleic anhydride, 1-10 parts of CBT resin and 0.3-0.7 part of efficient lubricant.
Preferably, the melt index of the POE resin is 10-30g/10min, and the Shore hardness is 40-75 degrees.
Preferably, the PVB resin is a plasticizer-free film grade PVB resin having a melt flow rate of from 0.8 to 2.2g/10min and a hydroxyl content of from 17 to 20%.
Preferably, the grafting rate of POE grafted maleic anhydride is 1.0-1.3 MA, and the melt index is 0.6-2.0 g/10min.
Preferably, the CBT resin is CBT100.
Preferably, the high-efficiency lubricant is a hyperbranched lubricant.
Preferably, the hyperbranched lubricant HyPer C182.
The invention also provides a preparation method for preparing the adhesive film for photovoltaic packaging, which comprises the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and efficient lubricant according to a proportion to obtain a mixture, and drying the mixture at 60-80 ℃ for 4-6 hours to ensure that the water content of the mixture is less than 100PPM;
(2) And (3) putting the dried mixture into an extruder for plasticizing, adding CBT resin into the side feed of a screw homogenization section, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material, namely the adhesive film for photovoltaic packaging.
Preferably, in the step (2), the process temperature of each device is respectively 150-240 ℃ of the extruder, 160-235 ℃ of the filter, 180-240 ℃ of the melt pump, 160-240 ℃ of the die temperature and 20-70 ℃ of the three-roll calender.
Compared with the prior art, the invention has the following advantages:
according to the invention, the defect of poor POE bonding performance is overcome by adopting a mode of blending POE resin and PVB resin, and the photovoltaic packaging adhesive film which has no plasticizer precipitation, excellent ageing resistance and stable bonding performance is obtained; the POE grafted maleic anhydride is added, so that the compatibility of the two resins is improved; the melt index of PVB resin in the plasticizing initial stage is improved by using the hyperbranched lubricant, and the plasticizing processing difficulty is reduced; meanwhile, the CBT100 is added at the homogenizing end of the screw, incomplete plasticizing of a plasticizing section caused by adding the CBT100 in advance is avoided, and the melt viscosity of the plasticized POE/PVB resin is effectively greatly reduced by the plasticizing section, so that the PVB resin is easy to process under the condition of no plasticizer. The preparation method is simple and feasible, widens the application prospect of POE/PVB adhesive film, promotes the material functionalization process, and has huge application prospect.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The starting materials referred to in the following examples are all commercially available. POE grafted maleic anhydride used in the following specific examples was purchased from Dow in the United states.
Example 1
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
10 parts of POE resin, wherein the melt index is 10g/10min, and the Shore hardness is 75 ℃;
90 parts of PVB resin, with a melt flow rate of 0.8g/10min and a hydroxyl content of 17%;
5 parts of POE grafted maleic anhydride, wherein the grafting rate is 1.0MA, and the melt index is 0.6g/10min;
0.7 parts of HyPer C182;
1 part of CBT100 resin.
The preparation method of the photovoltaic packaging adhesive film comprises the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and HyPer C182 according to a proportion to obtain a mixture, and drying the mixture at 60 ℃ for 4 hours to ensure that the water content of the mixture is less than 100PPM;
(2) Putting the dried mixture into an extruder for plasticizing, feeding CBT100 resin at the side of a screw homogenization section, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material; the process temperature of each equipment is respectively that of an extruder 150 ℃, a filter 160 ℃, a melt pump 180 ℃, a die temperature 160 ℃ and a three-roll calender 20 ℃.
Example 2
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
40 parts of POE resin, wherein the melt index is 30g/10min, and the Shore hardness is 40 ℃;
60 parts of PVB resin, wherein the melt flow rate is 2.2g/10min, and the hydroxyl content is 20%;
20 parts of POE grafted maleic anhydride, wherein the grafting rate of the maleic anhydride is 1.3MA, and the melt index is 2.0g/10min;
0.3 parts of HyPer C182;
10 parts of CBT100 resin.
The preparation method of the photovoltaic packaging adhesive film comprises the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and HyPer C182 according to a proportion to obtain a mixture, and drying at 80 ℃ for 6 hours to ensure that the water content of the mixture is less than 100PPM;
(2) Putting the dried mixture into an extruder for plasticizing, feeding CBT100 resin at the side of a screw homogenization section, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material; the process temperature of each equipment is respectively that of an extruder 240 ℃, a filter 235 ℃, a melt pump 240 ℃, a die temperature 240 ℃ and a three-roll calender 70 ℃.
Example 3
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
20 parts of POE resin, wherein the melt index is 17g/10min, and the Shore hardness is 55 degrees;
80 parts of PVB resin, wherein the melt flow rate is 1.2g/10min, and the hydroxyl content is 18%;
10 parts of POE grafted maleic anhydride, wherein the grafting rate of the maleic anhydride is 1.3MA, and the melt index is 2.0g/10min;
0.6 part of HyPer C182;
10 parts of CBT100 resin.
The preparation method of the photovoltaic packaging adhesive film comprises the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and HyPer C182 according to a proportion to obtain a mixture, and drying at 70 ℃ for 6 hours to ensure that the water content of the mixture is less than 100PPM;
(2) Putting the dried mixture into an extruder for plasticizing, feeding CBT100 resin at the side of a screw homogenization section, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material; the process temperature of each equipment is respectively that of the extruder 200 ℃, the filter 235 ℃, the melt pump 240 ℃, the die temperature 210 ℃ and the three-roller calender 50 ℃.
Example 4
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
40 parts of POE resin, wherein the melt index is 30g/10min, and the Shore hardness is 45 degrees;
60 parts of PVB resin, wherein the melt flow rate is 2g/10min, and the hydroxyl content is 17%;
5 parts of POE grafted maleic anhydride, wherein the grafting rate of the maleic anhydride is 1.3MA, and the melt index is 2.0g/10min;
0.7 parts of HyPer C182;
10 parts of CBT100 resin.
The preparation method of the photovoltaic packaging adhesive film comprises the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and HyPer C182 according to a proportion to obtain a mixture, and drying the mixture at 70 ℃ for 4 hours to ensure that the water content of the mixture is less than 100PPM;
(2) And (3) putting the dried mixture into an extruder for plasticizing, feeding the CBT100 resin at the side of a screw homogenization section, and cooling and shaping the mixture through a melt filter, a melt pump, a die and a three-roller calendar to obtain the POE/PVB adhesive film base material. The process temperature of each equipment is respectively that of the extruder 210 ℃, the filter 220 ℃, the melt pump 240 ℃, the die temperature 220 ℃ and the three-roller calender 20 ℃.
Comparative example 1
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
100 parts of PVB resin, wherein the melt flow rate is 2.2g/10min, and the hydroxyl content is 20%;
0.7 parts of HyPer C182;
10 parts of CBT100 resin.
The preparation method of the photovoltaic packaging adhesive film refers to the example 2.
Comparative example 2
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
40 parts of POE resin, wherein the melt index is 30g/10min, and the Shore hardness is 40 ℃;
60 parts of PVB resin, wherein the melt flow rate is 2.2g/10min, and the hydroxyl content is 20%;
20 parts of POE grafted maleic anhydride, wherein the grafting rate of the maleic anhydride is 1.3MA, and the melt index is 2.0g/10min;
HyPer C182, 0.3 parts.
The preparation method of the photovoltaic packaging adhesive film refers to the example 2.
Comparative example 3
The photovoltaic packaging adhesive film comprises the following components in parts by weight:
40 parts of POE resin, wherein the melt index is 30g/10min, and the Shore hardness is 40 ℃;
60 parts of PVB resin, wherein the melt flow rate is 2.2g/10min, and the hydroxyl content is 20%;
20 parts of POE grafted maleic anhydride, wherein the grafting rate of the maleic anhydride is 1.3MA, and the melt index is 2.0g/10min;
0.3 parts of HyPer C182;
10 parts of CBT100 resin.
The preparation method of the photovoltaic packaging adhesive film comprises the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride, hyPer C182 and CBT100 resin according to a proportion to obtain a mixture, and drying at 80 ℃ for 6 hours to ensure that the water content of the mixture is less than 100PPM;
(2) And (3) putting the dried mixture into an extruder for plasticizing, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material. The process temperature of each equipment is respectively that of an extruder 240 ℃, a filter 235 ℃, a melt pump 240 ℃, a die temperature 240 ℃ and a three-roll calender 70 ℃.
The film packaging performance test was performed on the POE window films of examples 1 to 4, comparative examples 1 to 3 and the commercial POE and the commercial PVB window films according to the photovoltaic film packaging standard GB/T29848-2013, respectively, and the results are shown in the following Table 1:
TABLE 1 film packaging Performance test
Figure BDA0004129035920000061
As can be seen from Table 1, the processability of examples 1 to 4 and comparative example, and comparative example 1, with reference to example 2, was poor in plasticizing effect without POE resin, indicating that the addition of POE has plasticizing effect on the resin system; in the comparative example 2, no CBT resin is added, the pressure of a melt pump end is too high, the resin cannot be plasticized and processed, and the CBT resin can flow like water after the temperature exceeds 130 ℃, so that the plasticizing capacity of a resin system is greatly improved; in comparative example 3, CBT resin was added in the raw material mixing section, and CBT with extremely low viscosity was first plasticized, resulting in insufficient plasticization of PVB in the first section, and the apparent white point of the product was large, and the CBT resin could solve the problem of insufficient plasticization in the homogenization section, and could also reduce the melt pump pressure. In addition, through an ultraviolet rapid aging test for 2000 hours, it can be seen that the ageing resistance of the material is improved by mixing POE/PVB resin, the FF value reduction rate of the material is low compared with that of a POE film and a PVB window film, and the material has excellent ageing peeling force and yellowing resistance, so that the encapsulation adhesion capability of the whole resin is improved by adding PVB, a system does not contain micromolecule auxiliary agent and plasticizer, the material is not separated out after ultraviolet ageing, the encapsulation durability of the material is ensured, and the photovoltaic encapsulation material with excellent performance is obtained in the embodiment.

Claims (9)

1. The adhesive film for photovoltaic packaging is characterized by comprising the following components in parts by weight: 10-40 parts of POE resin, 60-90 parts of PVB resin, 5-20 parts of POE grafted maleic anhydride, 1-10 parts of CBT resin and 0.3-0.7 part of efficient lubricant.
2. The adhesive film for photovoltaic packaging according to claim 1, wherein the melt index of the POE resin is 10-30g/10min, and the shore hardness is 40-75 degrees.
3. The photovoltaic packaging adhesive film according to claim 1 or 2, wherein the PVB resin is a plasticizer-free film grade PVB resin having a melt flow rate of 0.8-2.2g/10min and a hydroxyl content of 17-20%.
4. The adhesive film for photovoltaic packaging according to claim 1 or 2, wherein the grafting rate of POE grafted maleic anhydride is 1.0-1.3 MA, and the melt index is 0.6-2.0 g/10min.
5. The adhesive film for photovoltaic packaging according to claim 1 or 2, wherein the CBT resin is CBT100.
6. The adhesive film for photovoltaic packaging according to claim 1 or 2, wherein the efficient lubricant is a hyperbranched lubricant.
7. The adhesive film for photovoltaic packaging according to claim 6, wherein the hyperbranched lubricant HyPer C182.
8. A method for preparing the adhesive film for photovoltaic packaging according to claim 1, comprising the following steps:
(1) Uniformly mixing POE resin, PVB resin, POE grafted maleic anhydride and efficient lubricant according to a proportion to obtain a mixture, and drying the mixture at 60-80 ℃ for 4-6 hours to ensure that the water content of the mixture is less than 100PPM;
(2) And (3) putting the dried mixture into an extruder for plasticizing, adding CBT resin into the side feed of a screw homogenization section, and cooling and shaping through a melt filter, a melt pump, a die and a three-roller calender to obtain the POE/PVB adhesive film base material, namely the adhesive film for photovoltaic packaging.
9. The method according to claim 8, wherein in the step (2), the process temperature of each equipment is respectively 150-240 ℃ for the extruder, 160-235 ℃ for the filter, 180-240 ℃ for the melt pump, 160-240 ℃ for the die temperature, and 20-70 ℃ for the three-roll calender.
CN202310254456.XA 2023-03-16 2023-03-16 Adhesive film for photovoltaic packaging and preparation method thereof Pending CN116135941A (en)

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