CN109786505B - Online treatment method for production waste of transparent coating backboard - Google Patents
Online treatment method for production waste of transparent coating backboard Download PDFInfo
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- CN109786505B CN109786505B CN201910014585.5A CN201910014585A CN109786505B CN 109786505 B CN109786505 B CN 109786505B CN 201910014585 A CN201910014585 A CN 201910014585A CN 109786505 B CN109786505 B CN 109786505B
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses an online processing method of production waste of a transparent coating backboard, wherein the coating backboard comprises a base material layer and one or more layers of coatings coated on the surface of the base material layer, and the method comprises the following steps: A. collecting solvent vapor generated in the baking process in the manufacturing process of the coating backboard; B. b, filling crushed materials of the trimming waste and the semi-finished waste generated in the manufacturing process of the coating back plate into a separation container, introducing the solvent steam collected in the step A into the separation container, and turning over the crushed materials until no coating remains on the substrate layer; and in the step B, carrying out solid-liquid separation in the overturning process or after overturning, and drying the separated substrate layer for secondary utilization. The online treatment method directly utilizes the solvent steam generated in the manufacturing process of the coating backboard to carry out online treatment on the coating backboard waste, can be suitable for the online recovery treatment of the coating backboard with a transparent coating, a white coating, a black single-layer or multi-layer structure, and avoids the three wastes to the maximum extent.
Description
Technical Field
The invention belongs to the field of solar photovoltaic components, and particularly relates to an online treatment method of production waste of a transparent coating backboard.
Background
The solar photovoltaic component mainly comprises a glass cover plate, a hot melt adhesive film (EVA), a battery piece, a back plate, a junction box, a frame and the like. Because the back plate plays a role in supporting and protecting the battery piece, and the back plate is used as a packaging material which is directly contacted with the external natural environment in a large area, the performance of the back plate directly determines the power generation efficiency and the service life of the photovoltaic module, and the back plate has excellent insulativity, water vapor barrier property, weather resistance and the like. In recent years, double-sided components prepared from double-sided battery plates are favored by downstream markets due to the fact that both the positive side and the negative side can generate electricity, and the market demand for transparent back plates is increased dramatically.
The transparent coating type back plate is a double-sided fluorine coating type back plate formed by replacing a fluorine film with a three-dimensional network crosslinking fluorine coating mainly made of tetrafluoro resin or chlorotrifluoroethylene resin and the like, and is accepted by mainstream customers at home and abroad. The coating type backboard is composed of a three-layer structure of F-coating/PET/F-coating. PET has high crystallinity, low surface tension and weak polarity after biaxial stretching, and the surface polarity of PET needs to be improved through plasma treatment or corona treatment so as to generate reactive functional groups (such as OH, COOH and the like) on the surface. The functional groups can chemically react with a curing agent in the coating, so that a stable chemical bridging structure is generated between the fluororesin and the PET, and an integrated structure with three layers of chemical bonds between the coating and the PET is formed. In the production process, the fluororesin is required to be dissolved in a polar solvent to prepare a coating with the solid content of 25-45%, the coating is coated on the surface of the PET film and cured after being baked at the high temperature of 150-210 ℃, and a large amount of solvent steam is generated after baking.
For a large amount of solvent steam generated after baking in the production process of the back plate, manufacturers generally adopt a Regenerative Thermal Oxidizer (RTO) to decompose the exhaust gas at high temperature so as to meet the emission requirement. According to the current backboard product production standard, a 1-square backboard finished product corresponds to 75-100g of solvent. Estimated as the production of 100GW solar modules per year, corresponding to burning up to a hundred thousand tons of solvent at high temperature during the production of the backsheet product per year. In the production process of the coating type back sheet, in order to sufficiently dissolve the tetrafluoro resin or the chlorotrifluoroethylene copolymer resin, a mixed polar solvent such as a mixture of xylene, toluene, methyl ethyl ketone, butyl acetate, propylene glycol methyl ether acetate, and the like is used, and the solvent is completely vaporized after baking in the high-temperature curing stage of the fluorine coating. The traditional treatment mode is to discharge the waste gas after decomposing the waste gas into carbon dioxide and water at high temperature, and the traditional treatment mode has certain risk of incomplete combustion and also causes waste of solvent value.
CN107839105A discloses a method for directly hot-pressing and molding a plastic product with a fixed shape after pulverizing a back plate product, which is simple but has low added value. CN107214878A discloses a method for hydrolyzing a backboard under an alkaline condition by using a large amount of water and a solvent, which can realize the separation of different materials, but consumes a large amount of pure water and the solvent, thereby being uneconomical and environment-friendly. CN107425094A discloses a method for separating a back plate by high-temperature alcoholysis, wherein the dosage of an alcohol reagent is 2-6 times of that of the back plate, and the cost is high. The above methods all consider the method for treating and recycling the backboard products after use, and do not relate to the utilization of waste materials in the backboard production process.
In addition, the leftover materials and scrap materials of the coating backboard can not be directly reprocessed and utilized, and can only be treated as solid waste incineration, landfill and the like.
Disclosure of Invention
The invention aims to solve the defects and problems in the prior art, and provides an online treatment method of the production waste of the coating backboard.
In order to achieve the purpose, the invention adopts the following technical scheme:
an online treatment method for production waste of a coated back plate, wherein the coated back plate comprises a substrate layer and one or more layers of coatings coated on the surface of the substrate layer, and the online treatment method comprises the following steps:
A. collecting solvent vapor generated in the baking process in the manufacturing process of the coating backboard;
B. b, filling crushed materials of the trimming waste and the semi-finished waste generated in the manufacturing process of the coating back plate into a separation container, introducing the solvent steam collected in the step A into the separation container, and turning over the crushed materials until no coating remains on the substrate layer;
and in the step B, carrying out solid-liquid separation in the overturning process or after overturning, and drying the separated substrate layer for secondary utilization.
In the step B, the mixed turbid liquid after solid-liquid separation is treated for reuse.
Furthermore, after the mixed turbid liquid is treated, the solid content is detected, the proportion is calculated, and a small amount of coating raw materials are added again for mixing and then used as the coating again.
Specifically, after the mixed turbid liquid is subjected to precise filtration, the solid content is detected and calculated, and then fluororesin, inorganic filler, curing agent and dispersing agent are added according to the calculation result, and the mixed turbid liquid is ground to the working concentration and used as a coating again.
Further, in the step A, a polar solvent is used for preparing a coating from the coating raw material, the coating is coated on the surface of the substrate layer, and the backing plate is cured into a semi-finished product after baking.
Further, in the step a, the polar solvent is one or a mixture of more of xylene, toluene, butanone, butyl acetate, propylene glycol methyl ether acetate, N-dimethylformamide, N-dimethylacetamide and the like.
Further, in the step A, solvent vapor is collected at a negative pressure air outlet at the top or the side of the oven.
Further, in the step B, rake teeth are provided in the separation vessel, and the crushed material is turned over by rotating the rake teeth.
Further, in the step B, the overturning is kept for 10-100 minutes.
Further, in the step B, the turbid liquid generated by dissolving the coating layer by the solvent vapor flows to the liquid storage unit below the separation container, and the separated substrate layer is remained in the cavity of the separation container.
Further, the separation container is a plurality of and is connected in parallel with each other.
Further, the coating of the coated backing sheet comprises a single or multiple layer coating.
Further, the coating of the coated backing sheet includes, but is not limited to, a clear coating, a white coating, a black coating.
Further, the base material of the back plate includes but is not limited to one or more of PET, PBT, PP, PA, PPO, PEN, PI, PC, PMMA, PS and other high polymer materials.
In a preferred embodiment, the online processing method specifically includes:
step A, preparing a fluorine resin solvent, an inorganic pigment and a dispersing agent into 25-45% fluorine coating by using a mixed polar solvent, coating the fluorine coating on the surface of a substrate layer, baking the fluorine coating by using a high-temperature baking oven at 90-210 ℃ and curing the fluorine coating into a semi-finished back plate, generating a large amount of solvent steam after baking, and collecting the solvent steam at a negative air pressure outlet at the top or the side of each baking oven;
step B, mechanically crushing the edge cutting waste and the dead semi-finished product waste of the coating back plate, putting the crushed materials into a separation container, introducing solvent steam, rotating rake teeth to continuously overturn the crushed materials of the back plate, and keeping for 10-100 minutes until no fluorine coating residue exists on the substrate layer;
b, solid-liquid separation is realized in the step B, mixed turbid liquid formed after the fluorine coating is dissolved by solvent vapor flows to a liquid storage unit below the separation container, the substrate layer sheet is retained in a cavity of the separation container, and secondary utilization can be realized after drying; after the mixed turbid liquid is subjected to precise filtration and solid content measurement, the fluororesin, the inorganic pigment and the dispersing agent are newly added according to the proportion and ground to the working concentration, and then the fluorine coating can be used again.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
the waste material can be directly recycled on line, the waste material is treated in time, impurities are not introduced, the physical properties of the separated material are not influenced, and the separated material can be recycled; the heat energy in the production is utilized, the waste gas is not required to be combusted, and the energy is saved and the environment is protected; the separated substances can be reused in the original product after simple treatment, so that the value is maximized, and the three wastes are avoided to the maximum; the recycling can be realized, and no new material is consumed in the process; the evaporated solvent is a good solvent of the fluorine coating material, and can dissolve or swell the coating which is not completely cured in the presence of a high-temperature saturated solvent, and the fluorine resin can be reused after being ground and dispersed in the solvent.
Detailed Description
The following detailed description of the preferred embodiments of the invention is provided to enable those skilled in the art to more readily understand the advantages and features of the invention.
The embodiment provides an online treatment method of production waste of a coating type backboard, in particular to an online treatment method of production powder of a transparent coating type backboard. The coating type back plate comprises a base material layer and a coating coated on the surface of the base material layer; specifically, in this embodiment, the base layer is a PET sheet, and the coating layer is a fluorine coating layer formed by coating the surface of the PET sheet.
The online processing method comprises the following specific processes:
step 1, selecting 100 parts of chlorotrifluoroethylene-vinyl ether copolymer resin, 60 parts of dimethylbenzene, 40 parts of butyl acetate, 20 parts of butanone, 10 parts of flatting powder, 3 parts of dispersing agent and 1.5 parts of flatting agent, uniformly grinding, adding 30 parts of hexamethylene diisocyanate curing agent and 180 parts of butyl acetate to adjust the working concentration of the fluorine coating to be 40%, uniformly scraping the coating on a biaxially oriented PET substrate layer, passing through a three-section high-temperature oven, wherein the temperature range of each section of the oven is between 90 and 200 ℃, and collecting solvent steam at a negative pressure air outlet at the top or the side of each oven;
and 2, mechanically crushing the trimming scrap of 100KG coated back plate to about 5cm, putting the trimming scrap into a separation container, introducing the solvent steam collected in the step 1, controlling the revolution of rake teeth to be 2 times/min, keeping for 80 minutes, closing the solvent steam introduction valve, and drying to obtain the pure PET sheet stock of which the surface has no residual coating, wherein the pure PET sheet stock of which the surface has 86.5 KG.
In the process, solvent steam dissolves fluorine coating substances on the back plate and flows to a liquid storage unit below the container after being converted into mixed turbid liquid, 180KG mixed turbid liquid is obtained after precision filtration, the solid content is 7.5% after testing, chlorotrifluoroethylene-vinyl ether copolymer resin, titanium dioxide and a dispersing agent are newly added according to a ratio and are ground to normal working concentration for reuse, if the mixed turbid liquid is used as the fluorine coating in the step 1.
In the embodiment, a plurality of separation containers which are connected in parallel are arranged, so that continuous operation is realized, rake teeth are arranged in each separation container, and the crushed materials in the cavities of the separation containers are turned over through rotation of the rake teeth. The separation vessel is embodied as a rake separator.
The principle of the online treatment method for treating the composite backboard production waste provided by the invention is as follows:
and (3) carrying out high-temperature treatment on the edge cutting waste material of the coating back plate and the recycled back plate waste material by using high-temperature solvent steam in the production process of the coating back plate, and separating the fluorine coating from the substrate layer to obtain the fluorine-containing coating and the substrate resin sheet again. The fluorine-containing coating can be reused after readjusting the acid value, the hydroxyl value and the working solid content concentration, and the base material resin sheet can be reused.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The online treatment method of the production waste of the coated back plate comprises a substrate layer and one or more layers of coatings coated on the surface of the substrate layer, and is characterized by comprising the following steps:
A. collecting solvent vapor generated in the baking process in the manufacturing process of the coating backboard;
B. b, filling crushed materials of the trimming waste and the semi-finished waste generated in the manufacturing process of the coating back plate into a separation container, introducing the solvent steam collected in the step A into the separation container, and turning over the crushed materials until no coating remains on the substrate layer;
and in the step B, carrying out solid-liquid separation in the overturning process or after overturning, and drying the separated substrate layer for secondary utilization.
2. The on-line treatment method according to claim 1, wherein in the step B, the mixed turbid liquid after the solid-liquid separation is treated for reuse.
3. The on-line processing method as claimed in claim 2, wherein the mixed turbid liquid is processed, the solid content is detected and the proportion is calculated, and the coating raw materials are added again for mixing and used as the coating again.
4. The on-line processing method according to claim 3, wherein the mixed turbid solution is subjected to microfiltration, solid content is detected and calculated, and then fluororesin, inorganic filler, curing agent and dispersing agent are added according to the calculation result, and are ground to working concentration for being used as a coating again.
5. The on-line processing method according to claim 1, wherein in the step a, the coating raw material is prepared into a coating material by using a polar solvent, the coating material is coated on the surface of the substrate layer, and the coating material is cured into a semi-finished back plate after being baked.
6. The on-line processing method according to claim 1, wherein in the step A, solvent vapor is collected at a negative pressure air outlet at the top or the side of the oven.
7. The on-line processing method according to claim 1, characterized in that: in the step B, rake teeth are arranged in the separation container, and the crushed material is turned over by rotating the rake teeth.
8. The on-line processing method according to claim 1, wherein in the step B, the turning is kept for 10 to 100 minutes.
9. The on-line processing method according to claim 1, wherein in the step B, the turbid liquid generated by dissolving the coating layer with the solvent vapor flows to the liquid storage unit below the separation container, and the separated substrate layer remains in the cavity of the separation container.
10. The on-line process according to claim 1, wherein the separation vessel is plural and connected in parallel with each other.
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| CN201910014585.5A CN109786505B (en) | 2019-01-08 | 2019-01-08 | Online treatment method for production waste of transparent coating backboard |
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| CN201910014585.5A CN109786505B (en) | 2019-01-08 | 2019-01-08 | Online treatment method for production waste of transparent coating backboard |
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| CN109786505B true CN109786505B (en) | 2021-01-05 |
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| CN111076176B (en) * | 2019-12-20 | 2022-08-09 | 北京京能清洁能源电力股份有限公司北京分公司 | Pyrolysis device |
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| JP2007085012A (en) * | 2005-09-20 | 2007-04-05 | Atsushi Tsunoda | Vegetation board and tatami floor |
| EP2585292A1 (en) * | 2010-06-24 | 2013-05-01 | Dow Global Technologies LLC | Electronic device module comprising heterogeneous polyolefin copolymer and optionally silane |
| JP5982977B2 (en) * | 2012-04-13 | 2016-08-31 | 日立化成株式会社 | Solvent recovery method and coating drying equipment |
| JP6068948B2 (en) * | 2012-11-27 | 2017-01-25 | 横浜油脂工業株式会社 | Recycling method of solar cell module |
| US11421135B2 (en) * | 2016-05-20 | 2022-08-23 | Mitsui Chemicals, Inc. | Curable composition, coating material, solar cell coating material, solar cell back sheet coating material, adhesive, solar cell adhesive, solar cell back sheet adhesive, producing method of sheet, and curing agent |
| CN107425094B (en) * | 2017-06-07 | 2018-12-04 | 中天光伏材料有限公司 | One kind scrapping Crystalline Silicon PV Module insulating back panel method for innocent treatment |
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