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CN-122011570-A - Plasticizing preparation method of photovoltaic crosslinked adhesive film recycled material and plasticizing recycled product

CN122011570ACN 122011570 ACN122011570 ACN 122011570ACN-122011570-A

Abstract

The invention discloses a plasticizing preparation method of a photovoltaic crosslinked adhesive film recovery material and a plasticizing recovery product, aiming at the defect that the existing recovered crosslinked photovoltaic adhesive film material does not have thermoplastic melt processing performance, the invention firstly mixes polypropylene wax with crosslinked X-EVA/X-POE powder and then carries out heat treatment, the compatibility of the sizing material and other raw materials is improved, the thermal strength of the adhesive film powder is reduced, then the molecular chain of the crosslinked structure is broken under the action of an initiator by utilizing the high-temperature shearing effect of an extruder, the degradation and plasticization preparation of the crosslinked material are realized, and the melt processable characteristic of the recycled material (R-EVA/R-POE) is endowed again. Through the adjustment and optimization of the used formula, the blending product with good melt flow property can be screened out, can be used as a compatibilizer or a flexibilizer and applied to polymer alloy and polymer inorganic filling composite materials, and generates new economic value.

Inventors

  • MA JIAWEI
  • Hu Hanchu
  • ZOU XIANGPING
  • SONG YIHU
  • WU WUBIN

Assignees

  • 宁波甬复新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260319

Claims (10)

  1. 1. A plasticizing preparation method of a photovoltaic crosslinked adhesive film recycling material is characterized by comprising the following steps of, Crushing and grinding the recovered crosslinked photovoltaic packaging adhesive film to obtain crosslinked adhesive film powder; Fully mixing the crosslinked adhesive film powder, the low-melting-point compatilizer and the cosolvent in a high-speed stirrer, and then performing heat treatment to obtain a modified adhesive film powder mixture; the modified adhesive film powder mixture is evenly mixed with thermoplastic resin, peroxide initiator and polymerization inhibitor to obtain a mixture, which comprises the following components in percentage by mass, 65% -85% Of crosslinked adhesive film powder, 3% -10% of low-melting-point compatilizer, 2% -5% of cosolvent, 5% -20% of thermoplastic resin, 0.2% -1.0% of peroxide initiator and 0.01% -0.2% of polymerization inhibitor; and (3) carrying out melt extrusion granulation on the mixture by a double-screw extruder to obtain a flowable recovered product, and realizing plasticization preparation of the photovoltaic crosslinked adhesive film material.
  2. 2. The method for preparing the recycled material of the photovoltaic crosslinked adhesive film according to claim 1, wherein the recycled crosslinked photovoltaic packaging adhesive film comprises one or more of ethylene-vinyl acetate and ethylene-polyolefin elastomer.
  3. 3. The method for preparing the recycled material of the photovoltaic crosslinked adhesive film by plasticizing according to claim 2, wherein the recycled crosslinked photovoltaic packaging adhesive film has a melt index of less than 0.1g/10min at 230 ℃ and 10kg, and a crosslinking degree of 65% -90%.
  4. 4. The method for preparing the recycled material of the photovoltaic crosslinked film of claim 1, wherein the particle size of the crosslinked film powder is 20-200 meshes.
  5. 5. The method for preparing the recycled material of the photovoltaic crosslinked adhesive film according to claim 1, wherein the low-melting-point compatilizer is polypropylene wax with a melting point lower than 100 ℃, and the cosolvent comprises one or more of styrene, alpha-methyl styrene and ethyl styrene.
  6. 6. The method for preparing the recycled material of the photovoltaic crosslinked adhesive film according to claim 1, wherein the heat treatment is carried out at a temperature of 60-70 ℃ for 12-15 hours.
  7. 7. The method for producing a recycled material for a photovoltaic crosslinked film according to claim 6, wherein the thermoplastic resin comprises one or more of homo-polypropylene and co-polypropylene.
  8. 8. The method for producing a recycled material for a photovoltaic crosslinked film according to claim 7, wherein the peroxide initiator comprises one or more of dicumyl peroxide, di-t-amyl peroxide, and 2, 5-dimethyl-2, 5-bis (t-butylperoxy) ethane.
  9. 9. The method for preparing the recycled material of the photovoltaic crosslinked adhesive film according to claim 1, wherein the mixture is melt extruded and pelletized by a twin screw extruder, Adding the mixture into a hopper of a double-screw extruder, controlling the rotating speed of a screw host to be 100-300 r/min, controlling the current of the host to be 50-70%, controlling the temperature of each section of the screw to be respectively, The front section is 140-170 ℃, the middle section is 170-180 ℃, the rear section is 180-190 ℃, the temperature of the melt is 160-180 ℃, the residence time of the melt in a screw is 1-2 min, and the melt is cooled by water and pelletized after extrusion.
  10. 10. A plasticizable recovery product of a photovoltaic crosslinked adhesive film recovery material is characterized in that the plasticizable recovery product after plasticization treatment according to any one of claims 1-9 has a melt index of more than 7g/10min at 230 ℃ and 10 kg.

Description

Plasticizing preparation method of photovoltaic crosslinked adhesive film recycled material and plasticizing recycled product Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a plasticizing preparation method of a photovoltaic crosslinked adhesive film recovery material and a plasticizing recovery product. Background The photovoltaic packaging adhesive film material has the functions of adhering the photovoltaic glass, the battery piece and the backboard together in the photovoltaic module, protecting the battery piece and isolating air, and the types of the adhesive film material are mainly EVA adhesive film, POE adhesive film and laminated mixture thereof. EVA is a nontoxic, odorless and transparent thermoplastic elastomer similar to rubber elastomer, which is obtained by copolymerizing ethylene and vinyl acetate monomers under the action of an initiator, and has excellent flexibility, impact resistance, elasticity, optical transparency and the like. POE is a thermoplastic elastomer polymerized in situ from ethylene and an alpha-olefin (e.g., 1-octene) and has excellent weatherability, ozone resistance, ultraviolet linearity resistance and aging resistance, and can maintain stable performance under severe environmental conditions. In the application of the photovoltaic packaging adhesive film, the two materials are usually required to be subjected to certain pretreatment under the action of a cross-linking agent, when the temperature reaches the decomposition temperature of the cross-linking agent, a peroxy bond in the cross-linking agent is broken to form a peroxy free radical RO-, which is extremely easy to combine with H of alkyl on a branched chain, and a three-dimensional cross-linked network structure is formed in the structure after two alkyl active groups are combined, so that the adhesive film material has certain cross-linking degree and loses the thermoplastic melting processable characteristic. After recycling, the crosslinked material of the photovoltaic packaging cannot be further processed and used in a melt processing mode, and can only be processed in a landfill or incineration mode at present. If the monomer is required to be cracked again, high energy consumption modes such as pyrolysis, hydrolysis and the like are usually needed, but the cost of the methods is too high, and the economic value and the use value are low. Therefore, there is a need in the art to develop a method capable of changing the processing characteristics of crosslinked materials and further converting into new high-value materials that can be melt processed to facilitate recycling of resources, which has great environmental significance and market value. Disclosure of Invention This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application. The present invention has been made in view of the above and/or problems occurring in the prior art. Therefore, the invention aims to overcome the defects in the prior art and provide a plasticizing preparation method of a recycled material of a photovoltaic crosslinked adhesive film. In order to solve the technical problems, the invention provides a plasticizing preparation method of a photovoltaic crosslinked adhesive film recycling material, which comprises the steps of crushing and grinding a recycled crosslinked photovoltaic packaging adhesive film to obtain crosslinked adhesive film powder. And fully mixing the crosslinked adhesive film powder, the low-melting-point compatilizer and the cosolvent in a high-speed stirrer, and then performing heat treatment to obtain a modified adhesive film powder mixture. The adhesive film powder modified mixture is uniformly mixed with thermoplastic resin, peroxide initiator and polymerization inhibitor to obtain a mixture, which comprises the following components in percentage by mass, 65% -85% Of crosslinked adhesive film powder, 3% -10% of low-melting-point compatilizer, 2% -5% of cosolvent, 5% -20% of thermoplastic resin, 0.2% -1.0% of peroxide initiator and 0.01% -0.2% of polymerization inhibitor. And (3) carrying out melt extrusion granulation on the mixture by a double-screw extruder to obtain a flowable recovered product, and realizing plasticization preparation of the photovoltaic crosslinked adhesive film material. As a preferable scheme of the plasticization preparation method of the recycled material of the photovoltaic crosslinked adhesive film, the recycled crosslinked photovoltaic packaging adhesive film comprises one or more of ethylene-vinyl acetate and ethylene-polyolefin elastomer. As a preferable scheme of the plasticization preparation method of the recycled material of the p