Method for separating and recycling leftover materials of composite EVA (Ethylene Vinyl Acetate) adhesive film of solar back plate

A technology of a solar back sheet and a recycling method, which is applied in the field of separation and recycling of scraps of solar back sheet composite EVA film, can solve the problems of inability to dissociate the EVA hot melt adhesive film, and the inability to complete the separation of the back sheet and composite EVA film leftovers, etc. , to achieve the effect of complete recovery 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, this method can realize the separation of the backsheet material by dissociating the polyurethane adhesive in the backsheet material, but it cannot dissociate the cross-linked EVA hot melt adhesive film, and then cannot complete the separation of the composite EVA film scraps of the backsheet

Method used

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  • Method for separating and recycling leftover materials of composite EVA (Ethylene Vinyl Acetate) adhesive film of solar back plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) By weight, 100 parts of solar backplane composite EVA film scraps are separated by 20 parts of water, 50 parts of sodium hydroxide, 5 parts of JFC-1, 60 parts of acetone and 1 part of sodium dihydrogen phosphate solution, after 0.1 hour treatment at 30°C, the separated backplane membrane was cleaned with water;

[0027] (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 ;

[0028] (3) Add the mixed membrane obtained in (1) and 200 parts of water into the centrifuge, centrifuge and let it stand, and then obtain the EVA film floating on the water surface after separation and cleaning; then mix the remaining material with 200 parts The centrifuged liquid obtained in part (2) was put into a centrifuge, centrifuged at 10 rpm for 0.1 minute, and left to stand for 0.1 hour. After separation and cleaning, the fluorine-containing material and PET material were separated.

Embodiment 2

[0030] (1) By weight, put 100 parts of solar backplane composite EVA film scraps through a separation liquid composed of 500 parts of water, 1 part of potassium hydroxide, 0.1 part of JFC-E, 10 parts of ethanol and 30 parts of sodium tripolyphosphate, After being treated at 100°C for 72 hours, the separated backsheet membrane was cleaned with water;

[0031] (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 ;

[0032] (3) Add the mixed membrane obtained in (1) and 30 parts of water into the centrifuge, centrifuge and let it stand, then separate and wash to obtain the EVA film floating on the water surface; then mix the remaining material with 30 parts The centrifuged solution obtained in part (2) was put into a centrifuge, centrifuged at 20,000 rpm for 60 minutes, and allowed to stand for 100 hours, then the fluorine-containing material and PET material we...

Embodiment 3

[0034] (1) By weight, put 100 parts of solar backplane composite EVA film scraps through a separation liquid composed of 100 parts of water, 20 parts of calcium hydroxide, 1 part of JFC-2, 20 parts of methanol and 15 parts of sodium pyrophosphate. After 10 hours of treatment at 50°C, the separated backsheet membrane was cleaned with water;

[0035] (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 ;

[0036] (3) Add the mixed membrane obtained in (1) and 2000 parts of water into the centrifuge, centrifuge and let it stand, then separate and wash to obtain the EVA film floating on the water surface; then mix the remaining material with 2000 parts The centrifuged liquid obtained in part (2) was put into a centrifuge, centrifuged at 10,000 rpm for 5 minutes, and allowed to stand for 0.5 minutes to separate the fluorine-containing material and PET material in layers.

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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, which comprises the following steps that 100 parts of leftover materials of the composite EVA adhesive film of the solar back plate is treated for 0.1-72 hours at 20-100 DEG C by using a separation solution consisting of 20-500 parts of water, 1-50 parts of alkali, 0.1-5 parts of a penetrant, 1-60 parts of an organic solvent and 1-30 parts of sodium phosphate; the mixed system is sequentially transferred into water and centrifugate with the density of 1.2-2.0 g / cm<3> at the temperature of 5-80 DEG C for centrifugal separation, centrifugation is conducted for 0.1-60 minutes at the speed of 10-20000 revolutions per minute, standing is conducted for 0.1-100 hours, and then the EVA adhesive film, the fluorine-containing material and the PET material are obtained respectively. The method for separating and recycling the solar backboard composite EVA adhesive film material has the advantages of being free of toxicity in the separation process, high in separation efficiency and low in cost, large-scale treatment is easy in the technological process, and important application value and academic significance are achieved.

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. 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 source, a number of single solar cells must be connected in series or in parallel and tightly packaged into a module; while a solar cell module is an assembly of multiple solar cells assembled by assembly, it is a solar power generation system. The core part of the solar power generation system is also 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 crystalline silicon wafer cell and...

Claims

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Application Information

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IPC IPC(8): B29B17/02
CPCB29B17/02B29B2017/0296Y02W30/62
Inventor 卓东贤瞿波陈少云王睿郑燕玉刘小英李文杰
Owner QUANZHOU NORMAL UNIV
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