Method for recycling of coated honeycomb insulation panels

Abstract

The application discloses a recycling method of a film-coated honeycomb isolation plate, and belongs to the field of recycling of the film-coated honeycomb isolation plate. 5 Ω-10 10 Ω. The recycling method of the film-coated honeycomb isolation plate can realize accurate repair and recycling of the film-coated honeycomb isolation plate, meet the requirement of recycling of the original purpose, improve resource utilization, and avoid waste.

Description

Technical Field

[0001] This invention relates to the field of board recycling technology, and specifically to a method for recycling coated honeycomb partition panels. Background Technology

[0002] In existing technologies, coated honeycomb partition boards are generally for single use only, with no dedicated recycling and repair system. Moreover, the relevant recycling technologies are only focused on the crushing and recycling of general honeycomb paperboard, that is, crushing waste honeycomb boards and re-pulping them for the production of low-end paper products. This cannot achieve the reuse of coated honeycomb partition boards for their original purpose, resulting in low resource utilization. Summary of the Invention

[0003] The purpose of this invention is to provide a method for recycling coated honeycomb isolation panels, thereby solving the problem of low resource utilization in existing recycling systems.

[0004] To achieve the objectives of this invention, the following technical solution is provided: This invention provides a method for recycling a coated honeycomb separator, the coated honeycomb separator comprising a substrate and a coating disposed on the surface of the substrate, comprising: Waste coated honeycomb partition panels are classified into repairable panels and scrap panels. The repairable board material is cleaned and repaired to obtain a repaired board material with a surface resistivity of 10 Ω·cm. 5 Ω–10 10 Ω.

[0005] In one embodiment, the damaged area of ​​the repairable board is less than or equal to 10%; and / or The coating peeling rate of the repairable board is less than or equal to 5%; and / or The collapsed area of ​​the scrapped building materials is greater than or equal to 50%; and / or The film removal rate of the scrapped boards is greater than or equal to 50%.

[0006] In one embodiment, cleaning the repairable board material includes: Perform a cleaning on the repairable board material; Secondary cleaning is performed using environmentally friendly solvents; The repairable board material is dried and cleaned twice, and static electricity is removed.

[0007] In one embodiment, the primary cleaning process includes one or more of the following: high-pressure air knife, environmentally friendly solvent atomization spray, and ultrasonic cleaning; and / or The environmentally friendly solvent includes one or more of ethanol, isopropanol, benzyl alcohol, and ethyl lactate.

[0008] In one embodiment, the initial compressive strength of the coated honeycomb insulation panel is A1, and the repair of the repairable panel includes: The surface function of the repairable board is repaired so that the flatness of the repaired board is less than or equal to 0.5 mm; The repairable board material is tested and reinforced so that the compressive strength of the repaired board material is greater than or equal to 85%A1.

[0009] In one embodiment, repairing the surface function of the repairable board material includes: The film covering the repairable board material is repaired by hot air leveling or hot pressing. An antistatic layer is applied to the repairable board material.

[0010] In one embodiment, the temperature of the hot air leveling or hot press repair is 80℃-110℃; and / or, the pressure of the hot press repair is 0.1MPa-0.3MPa; and / or, the duration of the hot air leveling or hot press repair is 0.5min-2min.

[0011] In one embodiment, the repairable board material is tested and reinforced, including: The repairable board material with collapse is injected with glue and then hot-pressed for shaping; The repairable board material with damaged edges is cut. The repairable board material with separated layers is coated with adhesive and then laminated.

[0012] In one embodiment, the hot pressing temperature is 70℃-90℃; and / or, the hot pressing pressure is 0.2MPa-0.4MPa; and / or, the hot pressing duration is 0.5min-1.5min.

[0013] In one embodiment, the initial compressive strength of the coated honeycomb separator is A1, and it further includes: Record relevant data of the repairable board material after multiple repairs; Repair shall cease when the performance of the repairable board reaches the scrap standard after multiple repairs. The scrap standard is defined as follows: the compressive strength of the repairable board is less than 60%A1, and / or the damaged area of ​​the repairable board is greater than 10%, and / or the surface resistivity of the repairable board is less than 10%. 5 Ω, and / or, the surface resistivity of the repairable sheet material is greater than 10 Ω. 10 Ω.

[0014] This recycling method for coated honeycomb insulation panels involves the overall classification and repair of the panels. In the classification stage, based on multiple dimensions such as material characteristics, coating type, degree of damage, and usage history, the coated honeycomb insulation panels are precisely divided into different categories. This meticulous classification lays a solid foundation for subsequent repair work, ensuring that each panel receives the most suitable treatment for its condition. For different types of damage, such as coating wear and peeling, and deformation and breakage of the honeycomb structure, specialized repair equipment and materials are used for precise repair. This achieves precise repair and recycling of the coated honeycomb insulation panels, meeting the requirements for reuse in their original purpose, improving resource utilization, and avoiding waste. Furthermore, limiting the surface resistance of the coated honeycomb insulation panels ensures good insulation performance under normal use conditions, preventing leakage and ensuring the safety of personnel and equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a flowchart of a method for recycling a coated honeycomb separator according to one embodiment; Figure 2 This is a flowchart of one step in a method for recycling a coated honeycomb separator according to one embodiment. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0019] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0020] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0021] The core application of coated honeycomb separators in the photovoltaic field is as a structural backsheet and supporting substrate for photovoltaic modules, especially in the field of building-integrated photovoltaics (BIPV), where it is becoming a key solution. Coated honeycomb panels are widely used in BIPV, directly replacing many traditional building components. For example, they can be used in photovoltaic roofs, photovoltaic curtain walls, photovoltaic walls, and photovoltaic agricultural greenhouses without limitation. The honeycomb structure of coated honeycomb separators can also effectively absorb and disperse vibrations and impacts during transportation, preventing scratches, microcracks, or even breakage caused by direct contact between photovoltaic modules. The coating process makes the surface of the coated honeycomb separator dense, effectively blocking external dust and moisture, protecting the surface of the photovoltaic panels from dirt and moisture.

[0022] A coated honeycomb separator consists of a substrate and a coating applied to the surface of the substrate. The substrate is the core supporting structure of the coated honeycomb separator and typically employs a sandwich-like layered structure. The substrate represents the honeycomb core layer and can be either paper-based or composite-based. The main materials for paper-based substrates are corrugated paper, special insulating paper, or aramid paper, while the main materials for composite-based substrates can be aluminum alloy, polypropylene (PP), PET, fiberglass reinforced plastic (GFRP), etc., with no restrictions. The substrate includes a face panel and a honeycomb core. The face panel is located at the end of the honeycomb core, and the coating is applied to the side of the face panel facing away from the honeycomb core.

[0023] In photovoltaic applications, coatings can comprise multiple functional materials, including encapsulant films, coatings, and insulating layers. The encapsulant film can be made of materials such as ethylene-vinyl acetate copolymer (EVA) and polyvinyl butyral (PVB). Surface functional coatings / films can include polyethylene terephthalate film (PET), fluorocarbon paint, and weather-resistant polyester. Insulating layers can be made of polymer insulating films, ceramic particles and polymer composites, etc., with no restrictions. The insulating layer primarily serves critical protective functions such as electrical insulation and prevention of electrochemical corrosion.

[0024] Existing coated honeycomb partition boards mainly focus on the crushing and recycling of general honeycomb paperboard (crushing waste honeycomb boards and re-pulping them for the production of low-end paper products), or simple water washing of PP (polypropylene) hollow boards (only removing surface dust, which cannot meet the cleanliness requirements of photovoltaics). There is no dedicated repair process for photovoltaic scenarios. General honeycomb paperboard recycling technology can only crush and recycle, which cannot achieve the original purpose of photovoltaic partition boards, resulting in low resource utilization. Moreover, there is no photovoltaic-specific cleaning process, which cannot remove impurities such as silicon powder and oil stains unique to photovoltaic scenarios. There are also no anti-static repair or structural reinforcement steps, which cannot restore the original performance of the product. The cleaning method of PP hollow board recycling technology is simple, only removing surface dust, which cannot completely remove silicon powder and oil stains, and it is easy to leave impurities that contaminate new silicon wafers. Similarly, there is no anti-static coating repair step, so the static performance cannot be restored and cannot be adapted to photovoltaic requirements. There is no graded sorting, and blind repair leads to high repair costs and no commercial value. There is no performance testing and traceability system, so the quality of repaired products is unstable and cannot meet the quality control requirements of photovoltaic companies. Therefore, a dedicated recycling and repair system for photovoltaic coated honeycomb separators is needed to enable the large-scale recycling and reuse of waste separators for their original purpose, reduce resource waste and packaging costs and environmental pressures for photovoltaic companies, and meet the ESG assessment requirements of enterprises.

[0025] Please refer to Figure 1 This invention provides a method for recycling coated honeycomb separators, comprising: Step S10: Classify the waste coated honeycomb isolation panels to obtain repairable panels and scrapped panels; Step S20: Clean and repair the repairable board material to obtain a repaired board material with a surface resistivity of 10 Ω·cm. 5 Ω–10 10 Ω.

[0026] Optionally, in step S10, the waste coated honeycomb partition panels are first recycled, and the sorting method can be visual sorting or manual sorting. Different sorting standards can be used for coated honeycomb partition panels of different materials and with different usage requirements.

[0027] Optionally, the surface resistivity of the repaired board is 10. 5 Ω, 10 6 Ω, 10 7 Ω, 10 8 Ω, 10 9 Ω, 10 10Ω, etc., are not limited. When the surface resistance is too high, the charge cannot be effectively discharged and will accumulate on the surface, which can easily cause high-voltage electrostatic discharge (ESD), potentially damaging the sensitive electronic components of the photovoltaic module and causing permanent damage. When the surface resistance is too low, the surface of the coated honeycomb separator will be close to a "conductor", increasing the risk of leakage or easily introducing stray currents from the environment, interfering with the normal operation of the photovoltaic system.

[0028] Optionally, this also includes performance re-inspection and coding reuse of the repaired panels. Specifically, the repaired panels undergo comprehensive testing, including surface resistivity, cleanliness, flatness, and compressive strength, with the testing standards matching the initial performance of the coated honeycomb separator. Repaired panels that pass the re-inspection are laser-coded, with information including the number of cycles, repair date, and a pass / fail mark. These panels are then clean-packaged and reused; unqualified panels are either repaired again or designated as scrap. Laser coding records cyclical information, enabling quality traceability and meeting the quality control needs of photovoltaic companies.

[0029] This recycling method for coated honeycomb insulation panels involves the overall classification and repair of the panels. In the classification stage, based on multiple dimensions such as material characteristics, coating type, degree of damage, and usage history, the coated honeycomb insulation panels are precisely divided into different categories. This meticulous classification lays a solid foundation for subsequent repair work, ensuring that each panel receives the most suitable treatment for its condition. For different types of damage, such as coating wear and peeling, and deformation and breakage of the honeycomb structure, specialized repair equipment and materials are used for precise repair. This achieves precise repair and recycling of the coated honeycomb insulation panels, meeting the requirements for reuse in their original purpose, improving resource utilization, and avoiding waste. Furthermore, limiting the surface resistance of the coated honeycomb insulation panels ensures good insulation performance under normal use conditions, preventing leakage and ensuring the safety of personnel and equipment.

[0030] In one embodiment, the damaged area of ​​the repairable panel is less than or equal to 10%. Optionally, the damaged area of ​​the repairable panel can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., without limitation. Repairing panels with excessively large damaged areas requires removing a large area and then filling it with new honeycomb cores and panels, and the material and labor costs may even exceed those of replacing the entire panel. Therefore, panels with a damaged area of ​​less than or equal to 10% are repaired, while panels with excessively large damaged areas are scrapped.

[0031] For repairable boards, the coating delamination rate is less than or equal to 5%. For localized or small-area delamination of the substrate and coating, injection repair (resin injection method) can be used. A low-viscosity resin with good flowability is injected into the delaminated area to re-bond it. Furthermore, after repair using this method, the shear and bending strength recovery rate of the repaired board can reach over 80%.

[0032] The collapsed area of ​​scrapped panels is greater than or equal to 50%. Large-area collapse of the substrate of scrapped panels indicates that its internal structure has undergone plastic deformation or damage, completely losing its load-bearing capacity. Simply using methods such as glue injection cannot restore the mechanical properties of its honeycomb structure; replacing the entire panel is more economical and safer.

[0033] For scrapped boards, the coating detachment rate is greater than or equal to 50%. An excessively high coating detachment rate indicates a large-scale separation between the substrate and the coating. Applying adhesive over such a large area can easily lead to excessive structural weight and makes it difficult to ensure uniform adhesive distribution. Furthermore, the structural strength and stability of the repaired board will not meet usage requirements, posing a serious safety hazard. Therefore, boards with excessively high coating detachment rates should be scrapped.

[0034] Please refer to Figure 2 In one embodiment, step S20 involves cleaning the repairable board material, including: Step S21: Clean the repairable board material once; Step S22: Perform secondary cleaning using environmentally friendly solvents; Step S23: Dry the repairable board material after secondary cleaning and remove static electricity.

[0035] The purpose of primary cleaning is to efficiently remove loose and easily removable contaminants from the surface, while secondary cleaning can remove stubborn contaminants that are difficult to remove, ultimately achieving an absolutely clean surface.

[0036] Optionally, in step S22, the concentration of the environmentally friendly solvent can be 70%–85%, specifically 70%, 72%, 75%, 78%, 80%, 82%, 85%, etc., without limitation. Choosing an environmentally friendly solvent can balance cleaning effect, safety and environmental protection, and cost-effectiveness. Environmentally friendly solvents show good compatibility with commonly used PET films, aluminum honeycomb cores, and composite materials in coated honeycomb panels, and will not cause swelling or damage.

[0037] Optionally, in step S23, the drying method can be natural air drying or low-temperature drying, and the drying temperature can be 40℃-60℃, etc., without limitation. Static electricity can be removed using an ion fan, ion bar, ion gun, or static eliminator. Alternatively, a cleaning agent with built-in anti-static function can be used during primary and secondary cleaning, allowing static electricity control to begin simultaneously with cleaning.

[0038] A secondary cleaning and static electricity removal process can thoroughly remove silicon powder and oil stains from the surface of repairable panels, while keeping the surface of the coated honeycomb insulation panel static-free. The cleaned repairable panels achieve an impurity removal rate of at least 98%, with no solvent or ion residue.

[0039] In one embodiment, the primary cleaning process includes one or more of the following: high-pressure air knife, environmentally friendly solvent atomization spray, and ultrasonic cleaning. For surface dust, the high-pressure air knife achieves efficient "non-contact" cleaning, avoiding the risk of secondary contamination or scratches caused by physical contact. The pressure of the high-pressure air knife can be 0.3MPa-0.7MPa. Environmentally friendly solvent atomization spray can precisely remove dirt and tackle stubborn stains. The atomization technology can control the solvent consumption per cycle to a very low level, and the solvent can usually be recycled, purified, and reused. Ultrasonic cleaning, as a non-contact cleaning method, is very friendly to delicate or fragile honeycomb panel coated surfaces, effectively avoiding scratches or damage, and is easily integrated into automated production lines to achieve standardized batch cleaning.

[0040] Environmentally friendly solvents include one or more of ethanol, isopropanol, benzyl alcohol, and ethyl lactate. Specifically, isopropanol has a strong ability to remove grease and silicon powder impurities and can effectively dissolve organic substances such as photoresist. Ethyl lactate has both hydrophilic and lipophilic properties, and can dissolve both oil stains and water-soluble dirt. Benzyl alcohol can dissolve stubborn oil stains. In addition to removing oil stains, ethanol can also be used as a co-solvent to effectively regulate the evaporation rate of environmentally friendly solvents.

[0041] In one embodiment, the initial compressive strength of the coated honeycomb partition panel is A1. For repairable panels, step S20 includes: Repair the surface function of repairable boards to ensure that the flatness of the repaired boards is less than or equal to 0.5 mm. Repairable boards are tested and reinforced to ensure that the compressive strength of the repaired boards is greater than or equal to 85%A1.

[0042] Optionally, the flatness of the repaired board can be measured using methods such as straightedge / feeler gauge, laser scanning, and light illumination. Surface functional repair is used to restore the coating function and surface flatness.

[0043] Optionally, the location and form of damage to the repairable panel should be inspected and confirmed first. For example, if the damage location is determined to be in the central area and / or edge, and the form of damage is collapse and / or breakage and / or delamination, etc., the compressive strength of the repaired panel can be measured using universal testing machines for flat / lateral compression tests, impact / ultrasonic non-destructive testing, etc., to strengthen the repairable panel and restore its compressive strength, ensuring structural safety. Specifically, according to standards such as ASTM C365 or GB / T 1453, flat or lateral compression strength tests can be performed using a universal testing machine to directly verify the repair effect. Alternatively, impact testing (preliminary assessment) or ultrasonic scanning (quantitative analysis) can be used to detect whether there are internal defects such as delamination or bubbles in the repaired area.

[0044] In one embodiment, repairing the surface function of a repairable board material includes: Hot air leveling or hot pressing is used to repair the film coating of repairable boards; Apply an antistatic layer to repairable boards.

[0045] Optionally, for repairable boards with wrinkles or minor damage to the film coating, hot air leveling can be performed on small areas using a hot air gun or blower, while hot press leveling can apply uniform temperature and pressure to the film surface using a hot press or hot press roller, which can process large areas at once and achieve extremely high flatness after repair.

[0046] Optionally, the antistatic layer can be applied by spraying, roller coating, scraping, or touch-up coating, with no restrictions. The material of the antistatic layer must be the same as or compatible with the original antistatic layer of the repairable board. Specific materials for the antistatic layer can be carbon-based, conductive polymers, quaternary ammonium salts, etc., with no restrictions. After applying the antistatic layer, low-temperature curing is required. The curing temperature can be 55℃-75℃, and the curing time can be 1min-3min. The surface resistivity of the repaired board is 10 Ω·cm. 5 Ω–10 10 Ω. Furthermore, the antistatic coating can be applied only to the damaged area or applied to the entire area, depending on the usage scenario and requirements. This can significantly reduce repair costs while balancing efficiency and performance.

[0047] In one embodiment, the temperature for hot air leveling or hot pressing repair is 80℃-110℃. Optionally, the temperature for hot air leveling or hot pressing repair is 80℃, 85℃, 90℃, 95℃, 105℃, 110℃, etc., without limitation. Temperatures below 80℃ may fail to soften some of the adhesive, preventing it from regaining its fluidity and thus achieving repair. Temperatures above 110℃ may cause heat shrinkage of the coating, bubbling, or deformation of the substrate.

[0048] The pressure for hot-press repair is 0.1MPa-0.3MPa. Optionally, the pressure can be 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa, 0.3MPa, etc., without limitation. Insufficient pressure may prevent tight contact between the film and the substrate while expelling air bubbles. Excessive pressure may cause the honeycomb core to crush or permanent indentations on the panel.

[0049] The hot air leveling or hot press repair time is 0.5 min to 2 min. Optional times include 0.5 min, 1 min, 1.5 min, and 2 min, with no restrictions. Because the coated honeycomb separator is thin, heat can penetrate quickly. 0.5 min to 2 min is sufficient for the adhesive layer to reflow and bond under heat and pressure.

[0050] In one embodiment, testing and strengthening of repairable board materials includes: For repairable boards with collapse, apply glue and then heat-press to set the shape; Repairable boards with damaged edges are cut to size. The repairable boards with separated layers are coated with adhesive and then laminated.

[0051] Optionally, different types of repair can be performed on repairable panels based on the different locations and forms of damage detected. Adhesive injection can refill the crushed honeycomb core voids, forming a support structure similar to resin pillars after curing, restoring the compressive strength to 80%-95% of A1. Only a small amount of adhesive is needed to repair the collapsed area, resulting in low repair costs and short operation time, making it suitable for batch repair of mild to moderate collapses.

[0052] Optionally, damaged, broken, or irregular edge areas can be cut off and rounded to restore neat, straight edges to the panel. Edge sealing strips can also be added or the edges can be resealed. This eliminates sharp burrs and flash, preventing scratches to operators or the photovoltaic module surface. The neat edges also facilitate stacking and automated production line flow. The cut edges can also be resealed, such as by applying edge sealant, to prevent moisture from penetrating the honeycomb core, avoiding moisture absorption that could lead to mold or adhesive hydrolysis, and significantly extending the service life of the panel.

[0053] Optionally, for areas where the panel and honeycomb core have delaminated (layer separation), adhesive can be injected or applied, and then the layers can be re-bonded together by pressing. After layer separation, the panel cannot effectively transmit shear force, and the bending stiffness of the board decreases sharply. Re-adhesive bonding can restore the shear strength of the board to over 80%, preventing structural instability. Adhesive bonding does not damage the outer coating and antistatic layer, requires no re-surface treatment, and leaves minimal repair marks.

[0054] Optionally, the type of adhesive used for injection can be epoxy resin, acrylate, etc., without restriction.

[0055] In one embodiment, the hot-pressing temperature is 70℃-90℃. Optionally, the hot-pressing temperature can be 70℃, 75℃, 80℃, 85℃, 90℃, etc., without limitation. If the hot-pressing temperature is too low, the curing reaction cannot be activated and accelerated, nor can the curing time be shortened. If the hot-pressing temperature is too high, it may cause thermal damage (such as shrinkage or blistering) to the original material and the coating.

[0056] The hot-pressing pressure is 0.2MPa-0.4MPa. Optionally, the hot-pressing pressure can be 0.2MPa, 0.25MPa, 0.3MPa, 0.35MPa, 0.4MPa, etc., without limitation. This pressure range is higher than the pressure used for repairing wrinkles in the coating. Before the adhesive cures, it overcomes the elastic resistance of the collapsed area, forcibly pressing the repairable board back to a plane flush with the intact area, achieving a high flatness of ≤0.5mm. Furthermore, a pressure not exceeding 0.4MPa ensures that crushing will not occur.

[0057] The hot pressing time is 0.5 min to 1.5 min. Optionally, the hot pressing time can be 0.5 min, 1 min, 1.5 min, etc., without limitation. A holding time of 0.5 min to 1.5 min is sufficient to allow the adhesive to initially cure, thereby basically stabilizing the repaired flat shape. Subsequently, it can be removed for natural cooling or post-curing.

[0058] In one embodiment, the initial compressive strength of the coated honeycomb separator is A1, and it further includes: Record relevant data on repairable panels after multiple repairs; Repair should cease when the performance of repairable panels reaches the scrap standard after multiple repairs. The scrap standard is defined as follows: the compressive strength of the repairable panel is less than 60%A1, and / or the damaged area of ​​the repairable panel is greater than 10%, and / or the surface resistivity of the repairable panel is less than 10%. 5 Ω, and / or, the surface resistivity of repairable sheets is greater than 10 Ω. 10 Ω.

[0059] The scrapping standard is usually set at a level far below the theoretical failure value. Based on historical scrapping rate data, the number of new coated honeycomb partition panels that need to be replenished in the future can be predicted more accurately, enabling more lean inventory management and reducing capital occupation. By monitoring the performance degradation curve, the panels can be proactively taken out of service, repaired, or scrapped before their performance deteriorates to a dangerous threshold, avoiding sudden structural failures during critical production periods and ensuring production continuity.

[0060] The proposed recycling method for coated honeycomb separators features a closed-loop system, with a complete process of "production—use—recycling—repair—reuse," enabling the recycling of coated honeycomb separators, reducing costs and environmental impact. This recycling method is applicable to various specifications and materials (such as paper-based and composite-based) of coated honeycomb separators for photovoltaic applications, covering the entire photovoltaic scenario for waste separator recycling and repair, with no usage limitations. The repairability of discarded coated honeycomb separators is 80%-95%, with a repair qualification rate of ≥95%. The cost per repair is 0.02-0.06 yuan / piece, and each coated honeycomb separator can be recycled 2-10 times, reducing the overall cost of use by 60%-80% compared to single-use, significantly lowering packaging costs for photovoltaic companies. The surface resistivity of the repaired coated honeycomb separator is 10 Ω·cm. 5 Ω–10 10 Ω, cleanliness ISO Class 100-1000, flatness less than or equal to 0.5mm, compressive strength recovered to more than 85% of the initial compressive strength of the coated honeycomb separator, fully meeting the packaging requirements of photovoltaic silicon wafers, and basically consistent with the initial performance of the coated honeycomb separator.

[0061] The technical solution of the present invention will be described in detail below through specific embodiments.

[0062] Example 1 The waste coated honeycomb partition panels are paper-based, with dimensions of 210mm × 210mm and a thickness of 3.5mm, and 1000 panels were recycled. After visual identification and manual sorting, 840 repairable panels and 160 scrap panels were obtained. Among them, the repairable panels meet the following requirements: damaged area ≤ 8% and coating peeling rate ≤ 3%.

[0063] Cleaning of repairable boards includes: primary cleaning with a high-pressure air knife (pressure 0.4MPa-0.6MPa); secondary cleaning with an environmentally friendly solvent atomized spray, the environmentally friendly solvent being 70%-75% ethanol; natural air drying; and static electricity removal using ion air, with an impurity removal rate ≥99% and no ethanol / ion residue.

[0064] Repair of repairable panels included: leveling and repairing the coating of repairable panels using hot air at 90℃–100℃; and applying a quaternary ammonium salt antistatic coating to 130 repairable panels with electrostatic decay, curing at 60℃–70℃ for 2–3 minutes. The surface resistance of the repaired panels was 10 ohms. 6 Ω–10 9 Ω.

[0065] The repairable panels were tested and strengthened, including: injecting adhesive into 95 pieces of repairable panels with collapse and hot-pressing them, with a hot-pressing temperature of 80℃-90℃, a hot-pressing pressure of 0.3MPa-0.4MPa, and a hot-pressing time of 1min-1.5min; and cutting and bonding 30 pieces of repairable panels with edge damage, and performing R0.5-R1.0 (i.e., arc radius of 0.5mm-1mm) rounded corner treatment. The flatness of the repaired panels was 0.2mm-0.3mm, and the compressive strength was restored to more than 90% of the initial strength.

[0066] The repaired boards were re-inspected and coded: 815 boards passed the full inspection, with a pass rate of ≥97%; "Cycle-1" and the inspection date were laser-marked; the boards were clean-packaged for reuse; the cost of repairing a single board was 0.03-0.04 yuan, and the boards could be reused 3-8 times.

[0067] Example 2 The discarded coated honeycomb partition panels were high-cleanliness composite-based coated honeycomb partition panels, with dimensions of 182mm × 182mm and a thickness of 3.0mm. A total of 800 panels were recycled. After visual identification and manual sorting, 680 repairable panels and 120 scrap panels were obtained. The repairable panels met the following criteria: damaged area ≤ 5%, and coating peeling rate ≤ 2%.

[0068] Cleaning of repairable boards includes: primary cleaning using a high-pressure air knife and ultrasonic cleaning (pressure of the high-pressure air knife is 0.5MPa-0.7MPa); secondary cleaning using environmentally friendly solvent atomized spray, the environmentally friendly solvent being 80%-85% concentration isopropanol; drying at 60℃; and static elimination using an electrostatic eliminator, with an impurity removal rate ≥99.5% and no isopropanol / ion residue.

[0069] Repair of repairable boards includes: leveling and repairing the repairable boards with a film using hot air at 100℃–110℃; applying a conductive polymer antistatic coating to all 90 repairable boards with electrostatic decay, curing at 65℃–75℃ for 2.5min–3min; the surface resistance of the repaired boards is 10 Ω·cm. 5 Ω–10 8 Ω.

[0070] The repairable panels were tested and strengthened, including: spraying adhesive onto 70 pieces of repairable panels with collapse and hot-pressing them for shaping; the hot-pressing temperature was 75℃-85℃, the hot-pressing pressure was 0.2MPa-0.3MPa, and the hot-pressing time was 0.5min-1min; and applying adhesive and hot-pressing were performed on 25 pieces of repairable panels with interlayer separation. The flatness of the repaired panels was 0.1mm-0.2mm, and the compressive strength was restored to more than 95% of the initial strength.

[0071] The repaired boards were re-inspected and coded: 665 boards passed the full inspection, with a pass rate of ≥97.8%; "Cycle-1" and the inspection date were laser-marked; the boards were clean-packaged for reuse; the cost of repairing a single board was 0.04-0.06 yuan, and the boards could be reused 5-10 times.

[0072] Example 3 The waste coated honeycomb partition panels were thick paper-based coated honeycomb partition panels, with dimensions of 218mm × 218mm and a thickness of 4.5mm. 600 panels were recycled. After visual identification and manual sorting, 480 repairable panels and 120 scrap panels were obtained. The repairable panels met the following criteria: damaged area ≤ 10%, and coating peeling rate ≤ 5%.

[0073] Cleaning of repairable boards includes: primary cleaning with a high-pressure air knife (pressure of 0.3MPa-0.5MPa); secondary cleaning with an environmentally friendly solvent atomized spray (75%-80% concentration ethanol); air drying; and static electricity removal with ion air, achieving an impurity removal rate of ≥98% with no ethanol / ion residue.

[0074] Repair of repairable panels includes: leveling and repairing the coating of repairable panels using hot air at 80℃–90℃; locally applying a carbon-based conductive coating to 85 repairable panels with electrostatic attenuation, curing at 55℃–65℃ for 1–2 minutes; the surface resistance of the repaired panels is 10 ohms. 8 Ω–10 10 Ω.

[0075] The repairable panels were tested and strengthened, including: injecting adhesive into 60 pieces of repairable panels with dents and hot-pressing them, with a hot-pressing temperature of 70℃-80℃, a hot-pressing pressure of 0.2MPa-0.3MPa, and a hot-pressing time of 1min-1.5min; and cutting and bonding 40 pieces of repairable panels with edge damage, and performing R1-R1.5 (i.e., arc radius of 1mm-1.5mm) rounding treatment. The flatness of the repaired panels was 0.3mm-0.5mm, and the compressive strength was restored to more than 85% of the initial strength.

[0076] The repaired boards were re-inspected and coded: 460 boards passed the full inspection, with a pass rate of ≥95.8%; "Cycle-1" and the inspection date were laser-marked; the boards were clean-packaged for reuse; the cost of repairing a single board was 0.02-0.03 yuan, and the boards could be reused 2-6 times.

[0077] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0078] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for recycling a coated honeycomb separator, the coated honeycomb separator comprising a substrate and a coating disposed on the surface of the substrate, characterized in that, include: Waste coated honeycomb partition panels are classified into repairable panels and scrap panels. The repairable board material is cleaned and repaired to obtain a repaired board material with a surface resistivity of 10 Ω·cm. 5 Ω–10 10 Ω.

2. The method for recycling the coated honeycomb isolation panel according to claim 1, characterized in that, The damaged area of ​​the repairable board material is less than or equal to 10%; and / or The coating peeling rate of the repairable board is less than or equal to 5%; and / or The collapsed area of ​​the scrapped building materials is greater than or equal to 50%; and / or The film removal rate of the scrapped boards is greater than or equal to 50%.

3. The method for recycling the coated honeycomb isolation panel according to claim 1, characterized in that, Cleaning the repairable board material includes: Perform a cleaning on the repairable board material; Secondary cleaning is performed using environmentally friendly solvents; The repairable board material is dried and cleaned twice, and static electricity is removed.

4. The method for recycling the coated honeycomb isolation panel according to claim 3, characterized in that, The primary cleaning process includes one or more of the following: high-pressure air knife, environmentally friendly solvent atomization spray, and ultrasonic cleaning; and / or The environmentally friendly solvent includes one or more of ethanol, isopropanol, benzyl alcohol, and ethyl lactate.

5. The method for recycling the coated honeycomb isolation panel according to claim 1, characterized in that, The initial compressive strength of the coated honeycomb insulation panel is A1. Repairing the repairable panel includes: The surface function of the repairable board is repaired so that the flatness of the repaired board is less than or equal to 0.5 mm; The repairable board material is tested and reinforced so that the compressive strength of the repaired board material is greater than or equal to 85%A1.

6. The method for recycling the coated honeycomb isolation panel according to claim 5, characterized in that, Repairing the surface function of the repairable board material includes: The film covering the repairable board material is repaired by hot air leveling or hot pressing. An antistatic layer is applied to the repairable board material.

7. The method for recycling the coated honeycomb isolation panel according to claim 6, characterized in that, The temperature for hot air leveling or hot pressing repair is 80℃-110℃; and / or the pressure for hot pressing repair is 0.1MPa-0.3MPa; and / or the duration of hot air leveling or hot pressing repair is 0.5min-2min.

8. The method for recycling the coated honeycomb isolation panel according to claim 5, characterized in that, The repairable board material is tested and strengthened, including: The repairable board material with collapse is injected with glue and then hot-pressed for shaping; The repairable board material with damaged edges is cut. The repairable board material with separated layers is coated with adhesive and then laminated.

9. The method for recycling the coated honeycomb partition panel according to claim 8, characterized in that, The hot pressing temperature is 70℃-90℃; and / or the hot pressing pressure is 0.2MPa-0.4MPa; and / or the hot pressing time is 0.5min-1.5min.

10. The method for recycling the coated honeycomb separator according to any one of claims 1 to 9, characterized in that, The initial compressive strength of the coated honeycomb partition is A1, and it also includes: Record relevant data of the repairable board material after multiple repairs; Repair shall cease when the performance of the repairable board reaches the scrap standard after multiple repairs. The scrap standard is defined as follows: the compressive strength of the repairable board is less than 60%A1, and / or the damaged area of ​​the repairable board is greater than 10%, and / or the surface resistivity of the repairable board is less than 10%. 5 Ω, and / or, the surface resistivity of the repairable sheet material is greater than 10 Ω. 10 Ω.

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