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CN-122011954-A - Co-extrusion adhesive film with high adhesion and low gram weight, and preparation method and application thereof

CN122011954ACN 122011954 ACN122011954 ACN 122011954ACN-122011954-A

Abstract

The invention relates to the technical field of photovoltaic packaging adhesive films, and discloses a high-adhesiveness low-gram-weight co-extrusion adhesive film, and a preparation method and application thereof. The co-extrusion adhesive film is formed by co-extrusion casting of an upper EVA layer, a POE layer and a lower EVA layer, wherein the total gram weight of the co-extrusion adhesive film is 300-400g/m 2 , the gram weight of the POE layer is 60-120g/m 2 , the upper EVA layer and the lower EVA layer both comprise EVA matrix resin, a cross-linking agent, a silane coupling agent with double bonds and a titanate modified corrosion-resistant auxiliary agent in specific parts by weight, and the POE layer comprises POE matrix resin, POE difunctional modified resin with double grafts of the silane coupling agent and an auxiliary cross-linking agent in specific parts by weight and a cross-linking agent. The co-extruded adhesive film has the advantages of low gram weight, low cost, light weight, high adhesion, aging and yellowing resistance, high temperature and high humidity resistance and the like, has no abnormality in the lamination process, and can improve the reliability and efficiency of the flexible photovoltaic module.

Inventors

  • XU ZHIJIAN
  • YUAN YOU
  • Chang Zhuningzi
  • WANG ZHAN
  • SUN YUHAI
  • CHENG XUDONG

Assignees

  • 江苏中来新材科技有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The co-extrusion adhesive film with high adhesiveness and low gram weight is characterized by being formed by co-extrusion casting of an upper EVA layer, a POE layer and a lower EVA layer, wherein the POE layer is positioned between the upper EVA layer and the lower EVA layer, the total gram weight of the co-extrusion adhesive film is 300-400g/m 2 , and the gram weight of the POE layer is 60-120g/m 2 ; the upper EVA layer and the lower EVA layer comprise the following raw materials, by weight, 100-120 parts of EVA matrix resin, 2.8-3.5 parts of cross-linking agent, 0.5-0.8 part of silane coupling agent with double bonds and 0.1-0.2 part of titanate modified corrosion-resistant auxiliary agent; the POE layer comprises, by weight, 100-120 parts of POE matrix resin, 15-20 parts of POE bifunctional modified resin with double grafting of a silane coupling agent and a co-crosslinking agent, and 2.5-4 parts of a crosslinking agent.
  2. 2. The high adhesion low grammage co-extruded film according to claim 1, wherein the total grammage of the co-extruded film is 300-360g/m 2 .
  3. 3. The high-adhesion low-gram-weight co-extrusion adhesive film as claimed in claim 1, wherein the silane coupling agent with double bonds is one or a mixture of a plurality of gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, vinyl t-butylsilane triperoxide, vinyl triacetoxysilane and vinyl tri (beta-methoxyethoxy) silane.
  4. 4. The high adhesion low gram weight co-extruded film of claim 1 wherein the titanate modified corrosion inhibitor is a blend of titanate modified magnesium hydroxide particles and a polyethylene-polyvinyl acetate copolymer or a blend of titanate modified magnesium oxide and a polyethylene-polyvinyl acetate copolymer.
  5. 5. The high adhesion low gram weight co-extruded film of claim 4 wherein said titanate modified corrosion inhibitor is prepared by the steps of: Removing water from magnesium oxide or magnesium hydroxide as filler to obtain dried filler, diluting titanate coupling agent with 1-3 times of absolute ethyl alcohol or toluene to obtain diluted mixed solution, preheating the dried filler to 80-110 deg.C under stirring at 400-500rpm/min, slowly adding diluted mixed solution, continuously stirring and mixing for 10-20 min to ensure uniform coating of the titanate coupling agent on the surface of the filler, adding EVA resin for premixing, adding EVA resin with the addition amount of 2-5 times of the weight of the filler, melting and blending at the processing temperature of 80-100 deg.C, vacuum-exhausting to remove water and volatile components, and granulating the extruded melt by water cooling and granulating to obtain uniform modified anti-corrosion auxiliary particles.
  6. 6. The high adhesion low gram weight coextruded film of any of claims 1-5 wherein the cross-linking agents in the upper and lower EVA layers each comprise 1-1.5 parts primary cross-linking agent and 1.8-2 parts secondary cross-linking agent; the upper EVA layer and the lower EVA layer also comprise the following raw materials in parts by weight, namely 0.1-0.2 part of antioxidant auxiliary agent and 0.1-0.2 part of light stabilizer.
  7. 7. The co-extruded adhesive film with high adhesion and low gram weight according to any one of claims 1 to 5, wherein the preparation process of the POE dual-function modified resin with double grafting of the silane coupling agent and the auxiliary crosslinking agent comprises the steps of fully mixing POE resin, the silane coupling agent, the auxiliary crosslinking agent and an initiator in advance by adopting a one-step melt grafting method, wherein the silane coupling agent, the auxiliary crosslinking agent and the initiator respectively account for 1 to 2 percent, 1 to 2 percent and 0.1 to 0.2 percent of the mass of the POE resin, then carrying out grafting reaction by adopting a screw extruder at the melting temperature of 160 to 220 ℃, uniformly dispersing and reacting a melt under the shearing action, the shearing temperature is 80 to 100 ℃, the shearing speed is 800 to 1000rpm/min, and extruding, water-cooling and granulating the melt with complete reaction to obtain a finished product.
  8. 8. The high adhesion low gram weight co-extruded film according to any one of claims 1 to 5 wherein the cross-linking agent in the POE layer comprises 1 to 2 parts of a primary cross-linking agent and 1.5 to 2 parts of a secondary cross-linking agent; The POE layer also comprises the following raw materials, by weight, 0.5-0.8 part of a silane coupling agent and 0.1-0.2 part of a light stabilizer.
  9. 9. The method for preparing the high-adhesiveness low-gram-weight co-extrusion adhesive film as claimed in any one of claims 1 to 8, which is characterized by comprising the following preparation steps: S1, uniformly mixing all raw materials of a POE layer to obtain a semi-finished product material A, and uniformly mixing all raw materials of an upper EVA layer and a lower EVA layer to obtain a semi-finished product material B1 and a semi-finished product material B2 respectively; S2, adopting an EPE co-extrusion mode to melt and co-extrude the semi-finished product material B1, the semi-finished product material A and the semi-finished product material B2, casting and cooling to form a film, and thus obtaining the co-extrusion adhesive film.
  10. 10. The use of a high adhesion low gram weight co-extruded film according to any one of claims 1 to 8 as an encapsulating material in a flexible photovoltaic module.

Description

Co-extrusion adhesive film with high adhesion and low gram weight, and preparation method and application thereof Technical Field The invention relates to the technical field of photovoltaic packaging adhesive films, in particular to a high-adhesiveness low-gram-weight co-extrusion adhesive film, and a preparation method and application thereof. Background And the solar photovoltaic module packages the solar cells connected in series and parallel on the double-layer photovoltaic glass plate (or between the photovoltaic glass plate on one side and the photovoltaic backboard on the other side) through the photovoltaic packaging adhesive film. Along with the progress of packaging materials and process technologies, the photovoltaic module is also developing towards the trend of light weight, and the load on a bracket system and the like are reduced by reducing the dead weight of the photovoltaic module so as to adapt to more scenes and application environments. The existing photovoltaic packaging adhesive films are various in types, such as EVA adhesive films, POE adhesive films, EPE co-extrusion adhesive films, white adhesive films (such as white EVA adhesive films) or black high-reflection adhesive films, and the like, and can be applied to different environments and use scenes to improve the power generation efficiency of the photovoltaic module. However, as the quality of the photovoltaic module decreases, the reliability of the photovoltaic module itself faces higher demands as the packaging material changes. Aiming at the conventional production requirements of the photovoltaic module and the performance requirements of packaging materials, the gram weight of the photovoltaic packaging adhesive film can reach 400-500g/m 2, the gram weight of the traditional photovoltaic packaging adhesive film is large, the application scene of the photovoltaic packaging adhesive film is limited to a certain extent while the cost is increased, and the packaging requirements of more photovoltaic modules (such as light-weight flexible photovoltaic modules) can not be met. The lower gram weight of the adhesive film can reduce the total weight of the photovoltaic module and reduce the load of transportation and installation. Meanwhile, the light film gram weight can improve the light transmission performance of the photovoltaic module, increase the light absorption capacity of the photovoltaic cell and improve the photoelectric conversion efficiency. However, in general, there is a contradiction between the light weight and high adhesion properties of the adhesive film, and the adhesive film performance is also reduced due to the interface effect between the layers of the co-extruded adhesive film, resulting in deterioration of the adhesive property, aging yellowing resistance (such as PCT aging yellowing resistance, wet heat aging yellowing resistance) and crosslinking properties of the co-extruded adhesive film, and appearance defects such as laminated snowflake bubbles (as shown in publication No. CN116970351 a) of the co-extruded adhesive film. Therefore, developing a low-gram-weight co-extrusion adhesive film with the performances of light weight, high adhesion and the like has important significance for improving the performance of a photovoltaic module and reducing the cost. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a high-adhesiveness low-gram-weight co-extrusion adhesive film, a preparation method and application thereof, so that the co-extrusion adhesive film has excellent adhesiveness, ageing and yellowing resistance (such as PCT ageing and yellowing resistance and humidity and heat ageing and yellowing resistance) and crosslinking performance, and can greatly reduce laminated snowflake bubble phenomenon. Based on the above, the invention discloses a high-adhesiveness low-gram-weight co-extrusion adhesive film, which is formed by co-extrusion casting of an upper EVA layer, a POE layer and a lower EVA layer, wherein the POE layer is positioned between the upper EVA layer and the lower EVA layer, the total gram weight of the co-extrusion adhesive film is 300-400g/m 2, and the gram weight of the POE layer is 60-120g/m 2; the upper EVA layer and the lower EVA layer comprise the following raw materials, by weight, 100-120 parts of EVA matrix resin, 2.8-3.5 parts of cross-linking agent, 0.5-0.8 part of silane coupling agent with double bonds and 0.1-0.2 part of titanate modified corrosion-resistant auxiliary agent; the POE layer comprises, by weight, 100-120 parts of POE matrix resin, 15-20 parts of POE bifunctional modified resin with double grafting of a silane coupling agent and a co-crosslinking agent, and 2.5-4 parts of a crosslinking agent. The co-extrusion technology is adopted to thin the POE layer sandwiched between two EVA layers, the EVA layers and the POE layer are subjected to raw material formula improvement, and the EVA layers are subjected to thickn