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Method for separating and recycling leftover materials of composite EVA (Ethylene Vinyl Acetate) adhesive film of solar back panel based on low-temperature grinding method

A technology of solar back sheet and low temperature grinding, applied in the field of polymer material recycling, can solve the problems of inability to dissociate EVA hot-melt adhesive film, a large amount of waste liquid, etc., and achieve the effect of effective separation and high separation efficiency

Pending Publication Date: 2022-02-08
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this method can realize the separation of the backsheet material by dissociating the polyurethane adhesive in the backsheet material, it cannot dissociate the crosslinked EVA hot-melt adhesive film, and a large amount of waste liquid will be generated during the treatment process.

Method used

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  • Method for separating and recycling leftover materials of composite EVA (Ethylene Vinyl Acetate) adhesive film of solar back panel based on low-temperature grinding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Grind the solar backplane composite EVA film scraps into 800-mesh powder by a disc grinder at -30°C;

[0021] (2) Choose BaCl 2 The aqueous solution is used as the centrate, and the density of the centrate at 5°C is adjusted to 1.2 g / cm 3 ;

[0022] (3) Add 100 parts by weight of the powder obtained in (1) and 200 parts by weight of water into a centrifuge, centrifuge at 10 rpm for 0.1 minute, let stand for 0.1 hour, and separate the EVA film; The material and 200 parts by weight of the centrifuged liquid obtained in (2) were put into a centrifuge, centrifuged at 10 rpm for 0.1 minute, and allowed to stand for 0.1 hour to separate the fluorine-containing material and the PET material.

Embodiment 2

[0024] (1) Grind the leftovers of solar backplane composite EVA film into 50-mesh powder at 5°C with a rotating shaft grinder;

[0025] (2) Select CaCl 2 High saline solution is used as the centrifugal separation liquid, and the density of the centrifugal separation liquid at 80°C is adjusted to 2.0g / cm 3 ;

[0026] (3) Put 100 parts by weight of the powder obtained in (1) and 2,000 parts by weight of water into a centrifuge, centrifuge at 20,000 rpm for 60 minutes, let it stand for 100 hours, and separate the EVA film; Add 30 parts by weight of the centrifuged liquid obtained in (2) into a centrifuge, centrifuge at 20,000 rpm for 60 minutes, and let stand for 100 hours to separate the fluorine-containing material and the PET material.

Embodiment 3

[0028] (1) Grind the solar backplane composite EVA film scraps into 400-mesh powder through a central hole grinder at -15°C;

[0029] (2) Select KCl high-salt solution as the centrifugation liquid, and adjust the density of the centrifugation liquid at 20°C to 1.5g / cm 3 ;

[0030] (3) Add 100 parts by weight of the powder obtained in (1) and 500 parts by weight of water into a centrifuge, centrifuge at 10,000 rpm for 5 minutes, and after standing for 0.5 hours, separate the EVA film; The material and 2000 parts by weight of the centrifuged liquid obtained in (2) were put into a centrifuge, centrifuged at 10,000 rpm for 5 minutes, and left to stand for 0.5 hours to separate the fluorine-containing material and the PET material.

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Abstract

The invention discloses a method for separating and recycling leftover materials of a composite EVA adhesive film of a solar back plate based on a low-temperature grinding method, which comprises the following steps of: grinding the leftover materials of the composite EVA adhesive film of the solar back plate into 50-800-mesh powder by a grinding machine at the temperature of -30-5 DEG C, and sequentially transferring the powder into water at the temperature of 5-80 DEG C and centrifugate with the density of 1.2-2.0 g / cm<3> for centrifugal separation, centrifuging for 0.1 to 60 minutes at the speed of 10 to 20000 revolutions per minute, and standing for 0.1 to 100 hours, so as to respectively obtain the EVA adhesive film, the fluorine-containing material and the PET material. The method disclosed by the invention has the characteristics of no toxicity in the separation process, high separation efficiency and low cost, is simple and convenient in process flow and easy for large-scale treatment, and has important application value and academic significance.

Description

technical field [0001] The invention relates to the field of recycling and utilization of polymer materials, in particular to a method for separating and recycling solar backboard composite EVA film leftovers based on a low-temperature grinding method. Background technique [0002] Solar cells, also known as "solar chips" or "photovoltaic cells", are photoelectric semiconductor sheets that use sunlight to generate electricity directly. A single solar cell cannot be directly used as a power source. As a power supply, several single solar cells must be connected in series, parallel and tightly packaged into modules; a solar cell module is an assembly of multiple solar cells, which is the core part of the solar power generation system and also the core part of the solar power generation system. The most important part, its composition see figure 1 . [0003] It can be seen from the composition of the solar module that the EVA adhesive film plays the role of bonding the cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/02B29B17/04
CPCB29B17/02B29B17/0412B29B2017/0293Y02W30/52Y02W30/62
Inventor 卓东贤瞿波陈少云王睿
Owner QUANZHOU NORMAL UNIV
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