Enhanced flexible photovoltaic panel, preparation method thereof and flexible light photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic panels, and discloses an enhanced flexible photovoltaic panel, a preparation method thereof and a flexible light photovoltaic module. The reinforced flexible photovoltaic panel comprises a moisture-proof protective layer, a composite fiber reinforced plate and an inner bonding material layer which are sequentially laminated and compounded from outside to inside, the moisture-proof protective coating comprises organic silicon resin, acrylic resin, an organic silicon water repellent, a filler, an antioxidant, a defoaming agent, a flatting agent, a curing agent and a catalyst which are mixed according to the mass ratio of (40-75): 30: 4: 8: 0.5: 0.3: 0.3: 10: 0.5; the molecular weight of the organic silicon resin is 1000 to 4000. According to the enhanced flexible photovoltaic panel, the moisture-proof protective coating is optimized, and through cooperation of all the layers, the comprehensive performance, reliability and stability of the flexible light photovoltaic module can be effectively improved, the defects of a traditional flexible module in the aspects of bending strength, hardness, high temperature resistance, moisture resistance and the like are overcome, and the service life of the flexible light photovoltaic module is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic panels, and in particular to an enhanced flexible photovoltaic panel and a preparation method thereof, and a flexible lightweight photovoltaic module. Background Art

[0002] With the rapid rise of distributed photovoltaic power stations, flexible photovoltaic modules are favored by the market due to their strong adaptability and ability to fit various curved surfaces. Therefore, some photovoltaic backsheets for flexible photovoltaic modules have also emerged in the market.

[0003] For example, publication number CN117799271A provides a flexible solar photovoltaic backplane, which includes a protective layer, an upper insulating layer, a support layer and a lower insulating layer from top to bottom, the protective layer is a layer of fluorine-containing material, the upper and lower insulating layers are PET and PP double-layer adhesive films, and the support layer is a continuous fiber reinforced thermoplastic composite material; the flexible solar photovoltaic backplane has high mechanical strength and good dimensional stability, can protect and support solar cells for a long time, has high insulation and good conformability, can meet the requirements of special-shaped bonding, is light in weight, has good conformability, is resistant to voltage breakdown, is low-cost, and has a thin-sheet structure backplane material, which can effectively reduce the cost and installation cost of the entire solar panel.

[0004] However, this flexible solar photovoltaic backsheet still has many defects: for example, the low water vapor permeability of this flexible solar photovoltaic backsheet is mainly given by the PET / PP co-extruded film, and the upper insulating layer and the lower insulating layer are both PET / PP co-extruded films. Therefore, when this flexible solar photovoltaic backsheet is used in a flexible lightweight photovoltaic module, both the upper insulating layer and the lower insulating layer are located inside the entire flexible lightweight photovoltaic module, rather than outside the entire flexible lightweight photovoltaic module. Water vapor can still enter the flexible solar photovoltaic backsheet and the interior of the entire flexible lightweight photovoltaic module, so it is difficult to effectively prevent water vapor from penetrating from the source, and the effect of improving the water vapor permeability of the entire flexible lightweight photovoltaic module is limited, which will affect the life of the flexible solar photovoltaic backsheet and the entire flexible lightweight photovoltaic module in long-term extreme outdoor environments. For another example, the protective layer of this flexible solar photovoltaic backsheet is a layer of fluorine-containing material (such as PVF or PVDF film). This fluorine-containing material has good anti-aging and UV resistance, but its hardness is still low, and it is difficult to play a good protective role. It can be seen that the existing flexible solar photovoltaic backsheets and flexible photovoltaic modules have obvious shortcomings in bending strength, hardness, high temperature resistance and moisture resistance, which not only limits their service life, but also restricts the expansion of their application scenarios. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an enhanced flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module.

[0006] Based on this, the present invention discloses an enhanced flexible photovoltaic panel, comprising a moisture-proof protective layer, a composite fiber-reinforced plate and an inner bonding material layer for bonding a packaging film, which are laminated in sequence from the outside to the inside;

[0007] The moisture-proof protective coating used in the moisture-proof protective layer includes raw materials mixed in the following mass ratios: the mass ratio of silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoamer, leveling agent, curing agent, and catalyst is 40-75:30:4:8:0.5:0.3:0.3:10:0.5;

[0008] The organic silicone resin is a low molecular weight organic silicone resin with a molecular weight in the range of 1000-4000.

[0009] Preferably, the moisture-proof protective coating comprises raw materials mixed in the following mass ratio: the mass ratio of silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoaming agent, leveling agent, curing agent and catalyst is 70:30:4:8:0.5:0.3:0.3:10:0.5.

[0010] Preferably, the silicone water repellent is BS1308 from Wacker; the silicone resin is a low molecular weight silicone resin with a molecular weight in the range of 1500-3000. If a silicone resin with a larger molecular weight is used, the adhesion between the moisture-proof protective layer and the composite fiber reinforced board will be too poor, which will affect the reliability and stability of the enhanced flexible photovoltaic panel in long-term outdoor harsh environments.

[0011] Preferably, the filler is at least one of silicon dioxide, titanium dioxide, insulating carbon black, and copper chrome black filler. The combination of fillers can make the moisture-proof protective coating have an ultra-white or ultra-black appearance color, achieving the purpose of aesthetics.

[0012] Further preferably, the moisture-proof protective layer has a thickness of 6-20 μm.

[0013] More preferably, the moisture-proof protective layer has a thickness of 15 μm.

[0014] The moisture-proof protective coating of the present invention can further improve its comprehensive performance (such as hardness, scratch resistance, hydrophobicity, water vapor permeability, silicone adhesion, UV aging resistance UV60KWh yellowing resistance, etc.) by combining an appropriate amount of low molecular weight silicone resin with an appropriate amount of silicone hydrophobic agent and acrylic resin, and optimizing the thickness of the moisture-proof protective layer.

[0015] Further preferably, the composite fiber reinforced plate comprises: a reinforcing fiber cloth and a resin impregnating material for impregnating the reinforcing fiber cloth and then curing and forming;

[0016] The resin impregnation material comprises the following raw materials in the following mass ratio: the mass ratio of ceramic powder, unsaturated polyester resin, initiator and accelerator is 5-10:90:2-1:0.6; the ceramic powder is alumina ceramic powder or silicon nitride ceramic powder, or a mixed powder formed by alumina ceramic powder and titanium dioxide ceramic powder;

[0017] The reinforcing fiber cloth is polyimide fiber cloth or glass fiber cloth; the gram weight of the reinforcing fiber cloth is 50-500g / m 2 , the reinforcing fiber cloth is laid in single or multiple layers (the weight of the reinforcing fiber cloth is preferably 100-120g / m 2 , 3-4 layers are laid in total; or, the weight of the reinforced fiber cloth is preferably 500g / m 2 , a total of 1 layer is laid).

[0018] More preferably, the resin impregnation material comprises raw materials in the following mass ratio: the mass ratio of ceramic powder, unsaturated polyester resin, initiator and accelerator is 9:90:2-1:0.6.

[0019] The composite fiber reinforced board of the present invention is formed by curing after impregnating the reinforcing fiber cloth with a resin impregnating material. The resin impregnating material is prepared by mixing ceramic powder, unsaturated polyester resin, initiator and accelerator in a mass ratio of 5-10:90:2-1:0.6, and the type, gram weight and number of laying layers of the reinforcing fiber cloth are optimized. In this way, a composite fiber reinforced board with good scratch resistance, bending strength, dry heat yellowing resistance and high temperature resistance can be obtained. The composite fiber reinforced board also has the advantages of flexibility, light weight, good flatness and not easy to warp, thereby ensuring the long-term stable operation of the composite fiber reinforced board in extreme outdoor environments.

[0020] The reinforced flexible photovoltaic panel of the present invention has a moisture-proof protective layer on the outer surface of the composite fiber reinforced panel, which has the following advantages:

[0021] 1. The moisture-proof protective layer has excellent silicone bonding properties. The silicone and the low molecular weight silicone resin and silicone water repellent of the moisture-proof protective coating contain siloxane monomers, which can be combined into a network structure through water loss; further, the vinyl siloxane in the low molecular weight silicone resin and silicone water repellent and the double bonds in the acrylic resin can react with the unsaturated polyester resin in the composite fiber reinforced board, so that the moisture-proof protective layer can be better attached to the surface of the composite fiber reinforced board, and the PCT60h adhesion of the moisture-proof protective layer is good, and it is not easy to fall off or crack even if it is used in a long-term harsh outdoor environment.

[0022] 2. The moisture-proof protective layer can form a super-hydrophobic waterproof film with a low water vapor permeability, which can effectively prevent water penetration. The moisture-proof protective layer has a high hardness, so the moisture-proof protective layer can effectively prevent the composite fiber reinforced board from turning white in a high humidity environment due to the resin absorbing moisture easily. The moisture-proof protective layer also has good scratch resistance and UV aging resistance UV60KWh yellowing performance, which can well protect the composite fiber reinforced board and further improve the long-term stable operation of the composite fiber reinforced board in extreme outdoor environments.

[0023] 3. The moisture-proof protective layer has good chemical stability and will not change due to the action of chemical substances.

[0024] Further preferably, the inner bonding material used in the inner bonding material layer comprises raw materials mixed in the following mass ratios: the mass ratio of hydroxyl-containing saturated polyester resin, fluorocarbon resin, pigment filler, aliphatic isocyanate curing agent, organic tin catalyst, strength additive and anti-aging delamination additive is 50-75: 5-15: 15: 10: 0.6: 1-2: 2-3;

[0025] The strength aid is hydrogenated bisphenol A; the anti-aging delamination aid is epoxy-modified castor oil.

[0026] More preferably, the mass ratio of the hydroxyl-containing saturated polyester resin, fluorocarbon resin, pigment filler, aliphatic isocyanate curing agent, organic tin catalyst, strength aid and anti-aging delamination aid is 60-70:5-15:15:10:0.6:1-2:2-3.

[0027] The internal adhesive material used for the internal adhesive material layer of the present invention is based on the above-mentioned mass ratio of hydroxyl-containing saturated polyester resin, fluorocarbon resin, pigment filler, aliphatic isocyanate curing agent, and organic tin catalyst, and is further matched with the above-mentioned mass ratio of strength aid (hydrogenated bisphenol A) and aging-resistant delamination aid (epoxy-modified castor oil); in this way, the initial strength, PCT24h aging strength and PCT24h aging yellowing resistance of the internal adhesive material can be greatly improved; therefore, the internal adhesive material can be better applied to flexible photovoltaic panels (especially flexible photovoltaic back panels), so that the flexible photovoltaic panels can be used for a long time in harsh outdoor environments without aging stratification or aging yellowing.

[0028] The present invention also discloses a method for preparing an enhanced flexible photovoltaic panel, comprising the following preparation steps:

[0029] Step 1, preparation of composite fiber reinforced board: ceramic powder and unsaturated polyester resin are mixed, ground together to less than 10 μm, then initiator and promoter are added, stirred evenly, and bubbles are removed by vacuum to obtain resin impregnation material; the resin impregnation material is fully impregnated into reinforcing fiber cloth, two layers of release films are respectively applied to the upper surface and the lower surface of the impregnated reinforcing fiber cloth, the bubbles are removed by squeezing, and then heated and cured, and cut to obtain composite fiber reinforced board;

[0030] Step 2: coating of an inner bonding material layer: uniformly mixing a hydroxyl-containing saturated polyester resin, a fluorocarbon resin, a pigment filler, an aliphatic isocyanate curing agent, an organic tin catalyst, a strength additive and an anti-aging delamination additive to obtain an inner bonding material; uniformly coating the inner bonding material on the inner surface of the composite fiber reinforced board from which the release film has been removed;

[0031] Step 3. Preparation of enhanced flexible photovoltaic panels: Mix silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoaming agent, leveling agent, curing agent and catalyst, stir evenly to obtain a moisture-proof protective coating; evenly apply the moisture-proof protective coating on the outer surface of the composite fiber reinforced board after corona treatment, and cure it to obtain the enhanced flexible photovoltaic panel of this embodiment.

[0032] In step three, the moisture-proof protective coating is evenly coated, and after curing and forming, a moisture-proof protective layer with high hardness, super hydrophobicity and resistance to UV aging UV60KWh yellowing can be formed on the outer surface of the composite fiber reinforced board. The moisture-proof protective layer can also improve the scratch resistance and water vapor permeability of the outer surface of the enhanced flexible photovoltaic panel, and can well prevent water penetration. The moisture-proof protective layer also has good silicone adhesion and PCT60h adhesion, and can be firmly attached to the outer surface of the composite fiber reinforced board, and firmly bonded to the polymer frame, which greatly improves the reliability and stability of the enhanced flexible photovoltaic panels and flexible lightweight photovoltaic modules in long-term harsh outdoor environments, and is beneficial to prolonging the service life of the enhanced flexible photovoltaic panels and flexible lightweight photovoltaic modules in long-term harsh outdoor environments.

[0033] The present invention also discloses a flexible lightweight photovoltaic module, comprising a photovoltaic laminate and a photovoltaic frame for installing the side of the photovoltaic laminate; the photovoltaic laminate comprises a photovoltaic front panel, a first packaging film, a battery cell, a second packaging film and a photovoltaic back panel stacked in sequence from top to bottom; the photovoltaic back panel is an enhanced flexible photovoltaic panel as described above in the present invention, and the inner adhesive material layer is bonded to the second packaging film; the photovoltaic frame adopts a photovoltaic polymer frame.

[0034] The flexible and lightweight photovoltaic module made of the enhanced flexible photovoltaic panel of the present invention can be tightly combined with the high molecular polymer frame to form a whole, thereby enhancing the structural stability and flexibility of the photovoltaic module; the manufactured photovoltaic module adopts the high molecular polymer frame, which not only enhances the overall flexibility of the photovoltaic module, but also effectively solves the problem of damage to the photovoltaic module caused by the difference in the expansion coefficient of the frame material, and further enhances the flexibility and durability of the photovoltaic module.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] The reinforced flexible photovoltaic panel and the composite fiber reinforced panel of the present invention can improve the bending strength and high temperature resistance of the reinforced flexible photovoltaic panel, and can ensure its stable operation in extreme environments; and the outer surface of the composite fiber reinforced panel is equipped with a moisture-proof protective layer, and the raw material formula of the moisture-proof protective coating is optimized: (1) the silicone bonding performance and PCT60h adhesion of the moisture-proof protective layer are better, so that the moisture-proof protective layer is firmly bonded to the polymer frame, and the moisture-proof protective layer can be well attached to the surface of the composite fiber reinforced panel, and it is not easy to fall off or crack even if it is used in a long-term harsh outdoor environment; (2) the moisture-proof protective layer can also be formed A super-hydrophobic waterproof film is formed, which has a low water vapor permeability and can effectively prevent water penetration. The moisture-proof protective layer has a high hardness and can effectively prevent the composite fiber reinforced board from turning white due to the resin absorbing water in a high humidity environment. (3) The moisture-proof protective layer also has good scratch resistance and UV aging resistance (UV60KWh) yellowing resistance, which can well protect the composite fiber reinforced board. Therefore, through the cooperation of the moisture-proof protective layer and the composite fiber reinforced board, the long-term stable operation of the composite fiber reinforced board in extreme outdoor environments can be further improved; and the inner bonding material layer has a high bonding force with the encapsulation film of the photovoltaic module.

[0037] Therefore, the enhanced flexible photovoltaic panel of the present invention can be well applied to flexible lightweight photovoltaic modules through the cooperation of moisture-proof protective layer, composite fiber reinforced board and internal adhesive material layer, effectively improving the comprehensive performance, reliability and stability of flexible lightweight photovoltaic modules, reducing long-term maintenance costs, and helping to improve energy output efficiency. The enhanced flexible photovoltaic panel breaks the obvious shortcomings of traditional flexible lightweight photovoltaic modules in bending strength, hardness, high temperature resistance and moisture resistance, and can also significantly extend the service life of flexible lightweight photovoltaic modules, which has a positive role in promoting the popularization and development of distributed photovoltaic power stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the cross-sectional structure of an enhanced flexible photovoltaic panel in Example 1.

[0039] Figure 2This is a schematic diagram of the cross-sectional structure of a flexible photovoltaic panel of Comparative Example 9.

[0040] Figure 3 This is a schematic diagram of the cross-sectional structure of a photovoltaic laminate of a flexible and lightweight photovoltaic module according to Example 1.

[0041] Description of the accompanying drawings: inner bonding material layer 1; composite fiber reinforced board 2; moisture-proof protective layer 3; bonding glue layer 31; PVDF film 32;

[0042] Photovoltaic front panel 10; first packaging film 20; solar cell 30; second packaging film 40; photovoltaic back panel 50. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1

[0045] An enhanced flexible photovoltaic panel of this embodiment, see Figure 1 , including a moisture-proof protective layer 3, a composite fiber-reinforced board 2, and an inner bonding material layer 1 for bonding the packaging film, which are laminated in sequence from the outside to the inside. The outer side of the enhanced flexible photovoltaic panel refers to the side in contact with the outside air, while the inner side refers to the side close to the battery cell 30.

[0046] The moisture-proof protective layer 3 has a thickness of 15 μm. The moisture-proof protective coating used in the moisture-proof protective layer 3 includes: silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoamer, leveling agent, curing agent and catalyst 1 in a mass ratio of 60:30:4:8:0.5:0.3:0.3:10:0.5.

[0047] Specifically, the silicone resin is a low molecular weight silicone resin with a molecular weight of 2500; the silicone hydrophobic agent is BS1308 from Wacker of Germany; the filler is silicon dioxide and titanium dioxide in a mass ratio of 3:5; the antioxidant is a hindered phenol antioxidant, such as BASF 1010; the defoaming agent is a silicone leveling agent, such as Evonik 5200; the leveling agent is an acrylic leveling agent, such as BYK333; the curing agent is an isocyanate curing agent, such as Covestro N3600; and the catalyst 1 is an organic tin catalyst, such as monobutyl tin oxide.

[0048] The thickness of the composite fiber reinforced board 2 is 400 μm. The composite fiber reinforced board 2 comprises: polyimide fiber cloth and a resin impregnation material for impregnating the polyimide fiber cloth and then curing and forming; the resin impregnation material comprises: ceramic powder, unsaturated polyester resin, initiator and accelerator in a mass ratio of 9:90:1:0.6.

[0049] Specifically, the ceramic powder is a mixed powder of aluminum oxide and titanium dioxide in a mass ratio of 5:4, the unsaturated polyester is a linear unsaturated polyester resin, the initiator is methyl ethyl ketone peroxide, and the accelerator is cobalt cyclohexane. The weight of the polyimide fiber cloth is 120g / m 2 , a total of 3 layers of polyimide fiber cloth are laid.

[0050] The thickness of the inner bonding material layer 1 is 6 μm. The inner bonding material used in the inner bonding material layer 1 includes: hydroxyl-containing saturated polyester resin (Covestro 650) with a mass ratio of 60:15:15:10:0.6:1:2, fluorocarbon resin (Daikin GK570), pigments and fillers, aliphatic isocyanate curing agent, catalyst 2, strength aid and anti-aging delamination aid.

[0051] Specifically, the color filler is titanium dioxide pigment; the aliphatic isocyanate curing agent is Bayer N3390; the catalyst is monobutyltin trichloride, the power value additive is hydrogenated bisphenol A; and the anti-aging delamination additive is epoxy modified castor oil.

[0052] A method for preparing an enhanced flexible photovoltaic panel in this embodiment includes the following preparation steps:

[0053] S1. Preparation of composite fiber reinforced board 2:

[0054] S11, mixing ceramic powder with unsaturated polyester resin, grinding them together to less than 10 μm, then adding initiator and accelerator, stirring evenly, and then vacuuming to remove bubbles to obtain resin impregnation material.

[0055] S22. Use a coating machine to fully impregnate the polyimide fiber cloth with the resin impregnation material, and cover the upper and lower surfaces of the impregnated polyimide fiber cloth with two layers of release film respectively. The upper release film, the impregnated polyimide fiber cloth and the lower release film are squeezed and defoamed by a steel roller, and then put into an oven for heating and curing. The curing temperature is 150° C. and the curing time is 20 min. Cut to obtain a composite fiber reinforced board 2.

[0056] S2. Coating of inner adhesive material layer 1:

[0057] S21. Evenly mix the hydroxyl-containing saturated polyester resin, fluorocarbon resin, pigment filler, aliphatic isocyanate curing agent, catalyst 2, strength aid and anti-aging delamination aid to obtain an internal bonding material.

[0058] S22, removing the upper and lower release films of the composite fiber reinforced board 2, and coating the inner adhesive material evenly on the inner surface of the composite fiber reinforced board 2 from which the release films have been removed.

[0059] S3. Preparation of enhanced flexible photovoltaic panels:

[0060] S31. Mix the silicone resin, acrylic resin, silicone water repellent, filler, antioxidant, defoamer, leveling agent, curing agent and catalyst 1, and stir evenly to obtain a moisture-proof protective coating.

[0061] S32, using a coating machine, evenly coating the moisture-proof protective coating on the outer surface of the composite fiber reinforced board 2 after corona treatment, and then curing it at 165° C. for 2 minutes to obtain the enhanced flexible photovoltaic panel of this embodiment.

[0062] A flexible lightweight photovoltaic module of this embodiment includes a photovoltaic laminate and a photovoltaic frame for mounting the side of the photovoltaic laminate. Figure 3 The photovoltaic laminate comprises a photovoltaic front panel 10, a first encapsulation film 20, a battery cell 30, a second encapsulation film 40 and a photovoltaic back panel 50 which are stacked in order from top to bottom. The photovoltaic front panel 10, the first encapsulation film 20, the battery cell 30 and the second encapsulation film 40 are all referred to the prior art, so they are not repeated here. The photovoltaic back panel 50 is an enhanced flexible photovoltaic panel as described above in this embodiment. Figure 1 , 3 The inner bonding material layer 1 of the enhanced flexible photovoltaic panel is bonded to the second packaging film 40. The photovoltaic frame adopts the existing photovoltaic polymer frame.

[0063] Example 2

[0064] The enhanced flexible photovoltaic panel and its preparation method and the flexible lightweight photovoltaic module of this embodiment are all referred to in Example 1, and the difference between them and Example 1 is that:

[0065] In the moisture-proof protective coating used for the moisture-proof protective layer of this embodiment, the filler is replaced with silicon dioxide and copper chromium black in a mass ratio of 3:5, so that the moisture-proof protective layer is black.

[0066] Example 3

[0067] The enhanced flexible photovoltaic panel and its preparation method and the flexible lightweight photovoltaic module of this embodiment are all referred to in Example 2, and the difference between them and Example 2 is that:

[0068] In the strong flexible photovoltaic panel of this embodiment, the thickness of the moisture-proof protective layer is increased to 20 μm.

[0069] Example 4

[0070] The enhanced flexible photovoltaic panel and its preparation method and the flexible lightweight photovoltaic module of this embodiment are all referred to in Example 2, and the difference between them and Example 2 is that:

[0071] In the strong flexible photovoltaic panel of this embodiment, the thickness of the moisture-proof protective layer is reduced to 6 μm.

[0072] Example 5

[0073] The enhanced flexible photovoltaic panel and its preparation method and the flexible lightweight photovoltaic module of this embodiment are all referred to in Example 1, and the difference between them and Example 1 is that:

[0074] In the moisture-proof protective coating used for the moisture-proof protective layer of this embodiment, the mass ratio of the silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoamer, leveling agent, curing agent and catalyst 1 is changed to 40:30:4:8:0.5:0.3:0.3:10:0.5.

[0075] Example 6

[0076] The enhanced flexible photovoltaic panel and its preparation method and the flexible lightweight photovoltaic module of this embodiment are all referred to in Example 1, and the difference between them and Example 1 is that:

[0077] In the moisture-proof protective coating used for the moisture-proof protective layer of this embodiment, the mass ratio of the silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoamer, leveling agent, curing agent and catalyst 1 is changed to 70:30:4:8:0.5:0.3:0.3:10:0.5.

[0078] Comparative Example 1

[0079] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 2, and the difference between them and Example 2 is that:

[0080] In the moisture-proof protective coating used for the moisture-proof protective layer of this comparative example, no organic silicon water-repellent agent is added, and the mass ratios of the other raw materials remain unchanged.

[0081] Comparative Example 2

[0082] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 2, and the difference between them and Example 2 is that:

[0083] In the moisture-proof protective coating used for the moisture-proof protective layer of this comparative example, a low molecular weight silicone resin with a molecular weight of 2500 is not added, but is replaced by a methyl silicone resin with a molecular weight of 30000.

[0084] Comparative Example 3

[0085] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 2, and the difference between them and Example 2 is that:

[0086] In the moisture-proof protective coating used for the moisture-proof protective layer of this comparative example, no silicone resin is added, but fluorocarbon resin (such as Daikin GK570) is used instead.

[0087] Comparative Example 4

[0088] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 2, and the difference between them and Example 2 is that:

[0089] In the moisture-proof protective coating used for the moisture-proof protective layer of this comparative example, no silicone resin is added, but instead a polyester resin (Changxing high molecular weight saturated polyester resin ETERKYD 5054-PR-40) is added.

[0090] Comparative Example 5

[0091] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 1, and the difference between them and Example 1 is that:

[0092] In the flexible photovoltaic panel of this comparative example, a composite fiber-reinforced board is not used, but is replaced by a conventional PP board of the same thickness.

[0093] Comparative Example 6

[0094] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 1, and the difference between them and Example 1 is that:

[0095] In the flexible photovoltaic panel of this comparative example, an internal adhesive material layer is not used, but is replaced by an internal adhesive layer for a conventional backplane of the same thickness (a mixed coating of an existing polyester resin and an acrylic resin).

[0096] Comparative Example 7

[0097] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 1, and the difference between them and Example 1 is that:

[0098] In the flexible photovoltaic panel of this comparative example, the moisture-proof protective layer is not used, but is replaced by a conventional backplane air surface coating (a mixed coating of existing fluorocarbon resin and polyester resin) of the same thickness.

[0099] Comparative Example 8

[0100] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 1, and the difference between them and Example 1 is that:

[0101] The flexible photovoltaic panel of this comparative example only has a composite fiber reinforced board, while the moisture-proof protective layer and the inner adhesive material layer are omitted.

[0102] Comparative Example 9

[0103] A flexible photovoltaic panel and a preparation method thereof and a flexible lightweight photovoltaic module in this comparative example are all referred to Example 1, and the difference between them and Example 1 is that:

[0104] See also Figure 2 In the flexible photovoltaic panel of this comparative example, the moisture-proof protective layer is not used, but is replaced by: a bonding glue layer 31 with a thickness of 10 μm and a PVDF film 32 with a thickness of 25 μm. Correspondingly, in the preparation method of the flexible photovoltaic panel of this comparative example, step S3 is changed to: firstly coating the outer surface of the composite fiber reinforced board after corona treatment with the bonding glue layer 31, and then adhering the PVDF film 32 to the outer surface of the bonding glue layer 31.

[0105] Performance Testing

[0106] 1. The performance tests were performed on the flexible photovoltaic panels of Examples 1-6 and Comparative Examples 1-9, and the test results are shown in Table 1 below:

[0107] Table 1

[0108]

[0109] According to the data in Table 1, we can know that:

[0110] (1) Compared with Example 2, if the thickness of the moisture-proof protective layer increases (such as Example 3), its water vapor transmission rate is further reduced, but its silicone adhesive force (silicone adhesive force mainly reflects the bonding performance between the moisture-proof protective layer and the photovoltaic frame, the greater the force value, the stronger the bonding with the photovoltaic frame) and UV aging UV60KWh yellowing resistance will both decrease; if the thickness of the moisture-proof protective layer is reduced (such as Example 4), its UV aging UV60KWh yellowing resistance is slightly improved, but its water vapor transmission rate increases, and the silicone adhesive force decreases. Compared with Examples 3 and 4, as shown in Example 2, the thickness of the moisture-proof protective layer is maintained at 15 μm, and the comprehensive performance of the obtained enhanced flexible photovoltaic panel is better.

[0111] Compared with Example 1, if a relatively small amount of silicone resin (such as Example 5) is used in the moisture-proof protective coating used in the moisture-proof protective layer, its UV60KWh yellowing resistance is slightly improved, but its hardness, water vapor permeability resistance and silicone adhesive strength are reduced; if a relatively large amount of silicone resin (such as Example 6) is used, its water vapor permeability resistance, silicone adhesive strength and UV60KWh yellowing resistance can be further improved. In addition, it should be noted that if too much low molecular weight silicone resin is added to the moisture-proof protective coating, the adhesion performance of the moisture-proof protective layer will be reduced.

[0112] (2) If the silicone hydrophobic agent is not added to the moisture-proof protective coating used in the moisture-proof protective layer (such as in Comparative Example 1), its UV aging UV60KWh yellowing resistance is improved, but its water vapor permeability resistance is extremely poor and the silicone adhesive force is also reduced.

[0113] Compared with Example 2 (in which the moisture-proof protective coating is matched with a low molecular weight silicone resin with a molecular weight of 2500), if the moisture-proof protective coating used in the moisture-proof protective layer is matched with a high molecular weight methyl silicone resin (such as Comparative Example 2), its PCT60h adhesion is extremely poor, and the silicone bonding force is slightly reduced; and if it is matched with a fluorocarbon resin (such as Comparative Example 3) or a polyester resin (such as Comparative Example 4), its hardness, scratch resistance, hydrophobicity, water vapor permeability resistance, and silicone bonding force are all significantly deteriorated, especially when it is matched with a polyester resin (such as Comparative Example 4), its UV aging UV60KWh yellowing resistance is also significantly deteriorated.

[0114] It can be seen that moisture-proof protective coating, by combining an appropriate amount of low molecular weight silicone resin with an appropriate amount of silicone hydrophobic agent and acrylic resin, and optimizing the thickness of the moisture-proof protective layer, can further improve the comprehensive performance of enhanced flexible photovoltaic panels.

[0115] (3) In the flexible photovoltaic panel, if the composite fiber reinforced board is replaced by a conventional PP board (such as Comparative Example 5), its PCT60h adhesion and water vapor permeability resistance are significantly deteriorated; if only a composite fiber reinforced board is used (such as Comparative Example 8), its hydrophobicity, water vapor permeability resistance, silicone adhesion and UV aging UV60KWh yellowing resistance are significantly deteriorated; if the inner adhesive material layer is replaced by an inner adhesive layer for a conventional backplane (such as Comparative Example 6), its UV aging UV60KWh yellowing resistance is significantly deteriorated; if the moisture-proof protective layer is replaced by an air surface coating for a conventional backplane (such as Comparative Example 7), its hardness, scratch resistance, hydrophobicity and water vapor permeability resistance are significantly deteriorated.

[0116] 2. The composite fiber reinforced board and the inner adhesive material layer in the flexible photovoltaic panel of Example 1 were tested for performance respectively. The test results are shown in Table 2-3 below:

[0117] Table 2

[0118]

[0119] Table 3

[0120]

[0121] From Tables 1-3, it can be seen that: as shown in Example 1, through the combination of the above-mentioned moisture-proof protective layer, composite fiber reinforced board and inner adhesive material layer, the enhanced flexible photovoltaic panel can have high hardness, super hydrophobicity, low water vapor permeability and excellent PCT60h adhesion, scratch resistance, silicone adhesion, and resistance to ultraviolet aging UV60KWh yellowing performance, which can greatly improve the reliability and stability of flexible lightweight photovoltaic modules in long-term harsh outdoor environments, and is conducive to extending the service life of flexible lightweight photovoltaic modules in long-term harsh outdoor environments.

[0122] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0123] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An enhanced flexible photovoltaic panel, characterized in that: It includes a moisture-proof protective layer, a composite fiber-reinforced board, and an inner bonding material layer for bonding the packaging film, which are laminated in sequence from the outside to the inside; The moisture-proof protective coating used in the moisture-proof protective layer includes raw materials mixed in the following mass ratios: the mass ratio of silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoamer, leveling agent, curing agent, and catalyst is 40-75:30:4:8:0.5:0.3:0.3:10:0.5; The organic silicone resin is a low molecular weight organic silicone resin with a molecular weight in the range of 1000-4000.

2. The enhanced flexible photovoltaic panel according to claim 1, characterized in that: The moisture-proof protective coating comprises raw materials mixed in the following mass ratios: the mass ratios of silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoamer, leveling agent, curing agent and catalyst are 70:30:4:8:0.5:0.3:0.3: 10：0.5； The silicone resin is a low molecular weight silicone resin with a molecular weight in the range of 1500-3000; the silicone hydrophobic agent is BS1308 produced by Wacker Company; and the filler is at least one of silicon dioxide, titanium dioxide, insulating carbon black, and copper chromium black filler.

3. The enhanced flexible photovoltaic panel according to claim 2, characterized in that: The thickness of the moisture-proof protective layer is 6-20 μm.

4. The enhanced flexible photovoltaic panel according to claim 3, characterized in that: The thickness of the moisture-proof protective layer is 15 μm.

5. The enhanced flexible photovoltaic panel according to any one of claims 1 to 4, characterized in that: The composite fiber reinforced plate comprises: a reinforcing fiber cloth and a resin impregnating material used for impregnating the reinforcing fiber cloth and then curing and forming; The resin impregnation material comprises the following raw materials in the following mass ratio: the mass ratio of ceramic powder, unsaturated polyester resin, initiator and accelerator is 5-10:90:2-1:0.6; the ceramic powder is alumina ceramic powder or silicon nitride ceramic powder, or a mixed powder formed by alumina ceramic powder and titanium dioxide ceramic powder; The reinforcing fiber cloth is polyimide fiber cloth or glass fiber cloth; the gram weight of the reinforcing fiber cloth is 50-500g / m 2 , the reinforced fiber cloth is laid in single or multiple layers.

6. The enhanced flexible photovoltaic panel according to claim 5, characterized in that: The resin impregnation material comprises raw materials in the following mass ratio: the mass ratio of ceramic powder, unsaturated polyester resin, initiator and accelerator is 9:90:2-1:0.

6.

7. The enhanced flexible photovoltaic panel according to any one of claims 1 to 4, characterized in that: The inner bonding material used in the inner bonding material layer includes raw materials mixed in the following mass ratios: hydroxyl-containing saturated polyester resin, fluorocarbon resin, pigment filler, aliphatic isocyanate curing agent, organic tin catalyst, strength additive and anti-aging delamination additive in a mass ratio of 50-75: 5-15: 15: 10: 0.6: 1-2: 2-3; The power value additive is hydrogenated bisphenol A; The anti-aging delamination auxiliary agent is epoxy-modified castor oil.

8. The enhanced flexible photovoltaic panel according to claim 7, characterized in that: The mass ratio of the hydroxyl-containing saturated polyester resin, fluorocarbon resin, pigment filler, aliphatic isocyanate curing agent, organic tin catalyst, strength aid and anti-aging delamination aid is 60-70:5-15:15:10:0.6:1-2:2-3.

9. A method for preparing an enhanced flexible photovoltaic panel, characterized in that: The method comprises the following preparation steps: Step 1, preparation of composite fiber reinforced board: ceramic powder and unsaturated polyester resin are mixed, ground together to less than 10 μm, then initiator and promoter are added, stirred evenly, and bubbles are removed by vacuum to obtain resin impregnation material; the resin impregnation material is fully impregnated into reinforcing fiber cloth, two layers of release films are respectively applied to the upper surface and the lower surface of the impregnated reinforcing fiber cloth, the bubbles are removed by squeezing, and then heated and cured, and cut to obtain composite fiber reinforced board; Step 2: coating of the inner bonding material layer: uniformly mixing a hydroxyl-containing saturated polyester resin, a fluorocarbon resin, a pigment filler, an aliphatic isocyanate curing agent, an organic tin catalyst, a strength additive and an anti-aging delamination additive to obtain an inner bonding material; Evenly coating the inner bonding material on the inner surface of the composite fiber reinforced board from which the release film has been removed; Step 3. Preparation of enhanced flexible photovoltaic panels: Mix silicone resin, acrylic resin, silicone hydrophobic agent, filler, antioxidant, defoaming agent, leveling agent, curing agent and catalyst, stir evenly to obtain a moisture-proof protective coating; evenly apply the moisture-proof protective coating on the outer surface of the composite fiber reinforced board after corona treatment, and cure it to obtain the enhanced flexible photovoltaic panel of this embodiment.

10. A flexible lightweight photovoltaic module, comprising a photovoltaic front panel, a first encapsulation film, a battery cell, a second encapsulation film and a photovoltaic back panel stacked in sequence from top to bottom, characterized in that: The photovoltaic back sheet is an enhanced flexible photovoltaic panel as described in any one of claims 1 to 8, and the inner adhesive material layer is bonded to the second packaging film.

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