Composite aluminum foil water-blocking adhesive tape for edge sealing of photovoltaic module and preparation method of composite aluminum foil water-blocking adhesive tape

Abstract

The invention belongs to the technical field of adhesive tapes for photovoltaic modules, and particularly relates to a composite aluminum foil water-blocking adhesive tape for edge sealing of a photovoltaic module and a preparation method of the composite aluminum foil water-blocking adhesive tape. The composite base material layer comprises a silicone oil pre-treated PET layer, a bonding layer, an aluminum foil layer and an aluminum-plated prism layer which are stacked in sequence; the water-blocking adhesive layer is prepared from the following components in parts by mass: 40 to 70 parts of acrylate pressure-sensitive adhesive, 20 to 40 parts of polyolefin elastomer, 10 to 30 parts of inorganic filler, 5 to 15 parts of tackifying resin, 0.5 to 2 parts of antioxidant, 0.2 to 1 part of light stabilizer and 0.3 to 1.5 parts of cross-linking agent; the composite base material layer and the water-blocking adhesive layer are combined, the possibility that water vapor enters from the cross section of the water-blocking adhesive layer is blocked by utilizing the characteristic that the structural direction of the aluminum-plated prism layer in the composite base material layer is parallel to the edge sealing direction of the assembly, meanwhile, the contact area with the water-blocking adhesive layer is increased due to the arrangement of the prism structure, adhesive residues are avoided during high-temperature processing, and the service life of the assembly is prolonged. And the anti-aging performance of the photovoltaic module is comprehensively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesive tapes for photovoltaic modules, and particularly relates to a composite aluminum foil water-blocking adhesive tape for edge sealing of photovoltaic modules and a preparation method thereof. Background Art

[0002] As one of the clean new energy sources, solar photovoltaic modules play an important role in the domestic power system. With the continuous development of double-glass high-efficiency photovoltaic modules, higher requirements are put forward for water vapor resistance. At present, the water vapor resistance of the sealing silicone in the aluminum frame is limited. Water vapor penetrates through the edge of the module frame, which will cause the module hot melt adhesive layer to delaminate and the silver grid line to corrode, affecting the appearance and power of the module.

[0003] Existing processes attempt to introduce adhesives to encapsulate the frame, but in experiments some water vapor still enters through the cross section of the adhesive, causing corrosion to the photovoltaic modules.

[0004] Therefore, how to overcome the defect of water vapor permeability in the cross section of the adhesive used for edge sealing of photovoltaic module frames is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The embodiments of the present disclosure at least provide a composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules and a preparation method thereof.

[0007] In the first aspect, the embodiments of the present disclosure provide a composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules, comprising: a stacked composite substrate layer and a water-blocking adhesive layer; the composite substrate layer comprises a silicone oil pretreated PET layer, a bonding layer, an aluminum foil layer and an aluminum-plated prism layer stacked in sequence; the water-blocking adhesive layer is prepared from the following components in parts by mass: 40-70 parts of acrylate pressure-sensitive adhesive, 20-40 parts of polyolefin elastomer, 10-30 parts of inorganic filler, 5-15 parts of tackifying resin, 0.5-2 parts of antioxidant, 0.2-1 parts of light stabilizer, and 0.3-1.5 parts of cross-linking agent.

[0008] In an optional embodiment, the thickness of the composite substrate layer is 30-80 μm; the thickness of the water-blocking adhesive layer is 20-100 μm.

[0009] In an optional embodiment, the silicone oil pretreated PET layer is a release film with a silicone oil release agent coated on one side of PET, including an outer silicone release layer and an inner transparent PET layer adjacent to the adhesive layer; and the release force of the silicone oil pretreated PET layer is 10-20g / inch.

[0010] In an optional embodiment, the adhesive layer includes any one or more combinations of epoxy, hot melt adhesive and polyurethane adhesive.

[0011] In an optional embodiment, the thickness of the aluminum foil layer is 6-50 μm.

[0012] In an optional embodiment, the aluminum-plated prism layer includes a plurality of triangular prism structures arranged in parallel and formed by photocuring on the aluminum foil layer; the structural direction of the triangular prism is parallel to the edge sealing direction of the component, the bottom width of the triangular prism is 50-200 μm, and the top angle of the triangular prism is any one or more combinations of 90°, 120° and 150°; and the thickness of the aluminum coating on the aluminum-plated prism layer is 50-200 nm.

[0013] In an optional embodiment, the molecular weight of the acrylic pressure-sensitive adhesive is 300,000-800,000.

[0014] In an optional embodiment, the melt index of the polyolefin elastomer is 10-20 g / 10 min.

[0015] In an optional embodiment, the inorganic filler is a flaky inorganic filler, including any one or more combinations of alumina, hydrotalcite, calcium carbonate, graphene and boron nitride, and has a particle size range of 500 nm-10 μm.

[0016] In an optional embodiment, the tackifying resin includes any one or more combinations of rosin resin, petroleum resin and terpene resin.

[0017] In an optional embodiment, the antioxidant includes any one of a hindered phenol antioxidant and an aromatic amine antioxidant or a combination of both.

[0018] In an optional embodiment, the light stabilizer includes any one or a combination of two of an ultraviolet light absorber and a hindered amine light stabilizer.

[0019] In an optional embodiment, the cross-linking agent includes any one or more combinations of aliphatic isocyanate, alicyclic diisocyanate and epoxy curing agent.

[0020] In the second aspect, the embodiment of the present disclosure also provides a method for preparing the composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules as described above, comprising the following steps: step S1, pre-treating the single-sided silicon PET film, bonding it to the aluminum foil layer through an adhesive layer, making a photocured prism structure on the other side of the aluminum foil layer, and then plating an aluminum layer on the prism surface to obtain a composite aluminum foil substrate layer; step S2, pre-dissolving the polyolefin elastomer with a solvent until it is uniform for use, then adding it to the acrylic pressure-sensitive adhesive according to the added amount and stirring evenly, adding inorganic filler, tackifying resin, antioxidant, light stabilizer and cross-linking agent respectively and stirring evenly to obtain a water-blocking adhesive; step S3, coating the water-blocking adhesive on the composite aluminum foil substrate layer, drying it in a coating oven and directly rolling it up to obtain a composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules.

[0021] The beneficial effect of the present invention is that the composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules and the preparation method thereof combine the composite substrate layer with the water-blocking adhesive layer, and utilize the characteristic that the structural direction of the aluminum-plated prism layer in the composite substrate layer is parallel to the module edge sealing direction to block the possibility of water vapor entering from the cross section of the water-blocking adhesive layer. At the same time, the setting of the prism structure also increases the contact area with the water-blocking adhesive layer, and no residual adhesive is left during high-temperature processing, thereby comprehensively improving the aging resistance of the photovoltaic module.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a composite aluminum foil water-blocking tape for edge sealing of a photovoltaic module provided in an embodiment of the present disclosure;

[0026] Figure 2 A schematic diagram of the structure of a silicone oil pretreated PET layer provided in an embodiment of the present disclosure.

[0027] In the figure:

[0028] 1. Silicone oil pretreated PET layer; 11. Silicone release layer; 12. Transparent PET layer; 2. Adhesive layer; 3. Aluminum foil layer; 4. Aluminum-plated prism layer; 5. Water-blocking adhesive layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0031] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0032] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] The embodiment of the present disclosure provides a composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules, comprising: a laminated composite substrate layer and a water-blocking adhesive layer; the composite substrate layer comprises a silicone oil pre-treated PET layer, a bonding layer, an aluminum foil layer and an aluminum-plated prism layer laminated in sequence; the water-blocking adhesive layer is prepared from the following components in parts by mass: 40-70 parts of acrylate pressure-sensitive adhesive, 20-40 parts of polyolefin elastomer, 10-30 parts of inorganic filler, 5-15 parts of tackifying resin, 0.5-2 parts of antioxidant, 0.2-1 parts of light stabilizer and 0.3-1.5 parts of cross-linking agent.

[0035] In some embodiments, specifically, the thickness of the composite substrate layer is 30-80 μm; the thickness of the water-blocking adhesive layer is 20-100 μm.

[0036] In some embodiments, specifically, the silicone oil pretreated PET layer is a release film with a silicone oil release agent coated on one side of PET, including an outer silicone release layer and an inner transparent PET layer adjacent to the adhesive layer; and the release force of the silicone oil pretreated PET layer is 10-20g / inch. If the release force is too high, it will affect the unwinding force when the component is edge sealed, and if the release force is too low, the roll will easily run away when rolled up.

[0037] Specifically, the PET treated with a silicone release agent on the outside of the substrate can not only protect the aluminum foil from scratches, but also can be directly rolled up when the finished tape is rolled up, thereby reducing production costs and improving the efficiency of component edge sealing.

[0038] In some embodiments, specifically, the adhesive layer includes any one or more combinations of epoxy, hot melt adhesive and polyurethane adhesive, and the high shear strength of the structural adhesive is used to prevent the substrate layer from being delaminated during use.

[0039] In some embodiments, specifically, the thickness of the aluminum foil layer is 6-50 μm. Aluminum foil has a water vapor permeability of nearly zero and has been widely used in fields with high requirements for packaging and air tightness. However, if the aluminum foil is too thick, it is not easy to fit the components together, and if it is too thin, it is easy to break.

[0040] In some embodiments, specifically, the aluminum-plated prism layer includes a plurality of triangular prism structures arranged in parallel and formed by photocuring on the aluminum foil layer; the structural direction of the triangular prism is parallel to the edge sealing direction of the component, the bottom width of the triangular prism is 50-200 μm, and the top angle of the triangular prism is any one or more of 90°, 120° and 150°; and the thickness of the aluminum plating on the aluminum-plated prism layer is 50-200 nm; the striped structure of the aluminum-plated prism not only increases the contact area of ​​the adhesive, but also is not easy to leave residual adhesive at high temperature. This aluminum-plated structure utilizes the low water permeability of the aluminum-plated layer. Since its prism structure direction is parallel to the edge sealing direction of the component, the multi-layer blocking water vapor enters from the cross section of the water-blocking adhesive layer, thereby greatly reducing the possibility of possible water vapor entry.

[0041] In some embodiments, specifically, the molecular weight of the acrylic pressure-sensitive adhesive is 300,000-800,000, and the acrylic pressure-sensitive adhesive with a large molecular weight is used to obtain good viscosity and low water permeability.

[0042] In some embodiments, specifically, the melt index of the polyolefin elastomer is 10-20g / 10min, which is at 190°C. The POE polyolefin material has low density, good impact resistance, very low water vapor permeability and excellent aging resistance. The POE material is dissolved, blended and dispersed evenly with the acrylic glue, and has the excellent properties of both.

[0043] In some embodiments, specifically, the inorganic filler is a flaky inorganic filler, including any one or more combinations of alumina, hydrotalcite, calcium carbonate, graphene and boron nitride, with a particle size range of 500nm-10μm, which can not only reinforce the strength of the adhesive layer, but also hinder the penetration and migration of water vapor in the adhesive layer, thereby further reducing the water vapor permeability.

[0044] In some embodiments, specifically, the tackifying resin includes any one or more combinations of rosin resin, petroleum resin and terpene resin. The resin can increase the initial adhesion and peeling force of the adhesive layer to the component, so that the tape fits tightly, does not lose adhesion at high temperature and high humidity, and effectively protects the component.

[0045] In some embodiments, specifically, the antioxidant includes any one of a hindered phenol antioxidant and an aromatic amine antioxidant or a combination of both. The antioxidant can capture aging free radicals and delay or inhibit the oxidation process of the polymer.

[0046] In some embodiments, specifically, the light stabilizer includes any one or a combination of ultraviolet absorbers and hindered amine light stabilizers. When the number of parts of the light stabilizer is within 1 part, a low amount of the light stabilizer can absorb ultraviolet light refracted into the component frame, reduce the decomposition of the tape by light, and ensure the stickiness of the tape.

[0047] In some embodiments, specifically, the cross-linking agent includes any one or more combinations of aliphatic isocyanate, alicyclic diisocyanate and epoxy curing agent, which can further enlarge the molecular chains of the adhesive layer through the cross-linking points and enhance the cohesive force of the adhesive layer.

[0048] The disclosed embodiment also provides a method for preparing the composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules as described above, comprising the following steps: step S1, pre-treating a single-sided silicon PET film, bonding it to the aluminum foil layer through an adhesive layer, making a light-cured prism structure on the other side of the aluminum foil layer, and then plating an aluminum layer on the prism surface to obtain a composite aluminum foil substrate layer; step S2, pre-dissolving a polyolefin elastomer with a solvent until it is uniform for use, then adding it to an acrylic pressure-sensitive adhesive according to the added amount and stirring evenly, adding an inorganic filler, a tackifying resin, an antioxidant, a light stabilizer and a cross-linking agent respectively and stirring evenly to obtain a water-blocking adhesive; step S3, coating the water-blocking adhesive on the composite aluminum foil substrate layer, drying it in a coating oven and directly rolling it up to obtain a composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules.

[0049] Example 1

[0050] See also Figure 1 and Figure 2 ,like Figure 1 and Figure 2 As shown, the composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules in this embodiment includes, from top to bottom:

[0051] 1. The total thickness of the composite aluminum foil substrate layer is 50um, of which the back side 15um PET release surface release force is 15g / inch; the thickness of the polyurethane adhesive layer is 5um; the aluminum foil is 10um; the prism layer top glue is 120°, 20um high, 70um wide, and the aluminum plating thickness is 100nm;

[0052] 2. The thickness of the pressure-sensitive adhesive layer of the water-blocking adhesive is 40um. Due to the groove structure of the prism, the adhesive layer penetrates into the prism after being compounded with the composite aluminum foil substrate. The total thickness of the tape is 80um.

[0053] The composition of the water-blocking adhesive layer is as follows: 50 parts of acrylic pressure-sensitive adhesive (Kunshan Shimei, PS8230), 30 parts of polyolefin elastomer (Mitsui Chemicals, A-20070, MI value 18), 20 parts of inorganic filler (Suzhou Napu, NS-BN, sheet diameter 2um), 10 parts of tackifying resin (Arakawa Chemical, 803L, terpene phenol resin), 0.5 parts of antioxidant (BASF, 1010), 0.5 parts of light stabilizer (Lianlong, 622), and 0.6 parts of cross-linking agent (Kunshan Shimei, PX23000A).

[0054] Example 2

[0055] The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules in this embodiment comprises, from top to bottom:

[0056] 1. The total thickness of the composite aluminum foil substrate layer is 50um, of which the back side 15um PET release surface release force is 15g / inch; the thickness of the polyurethane adhesive layer is 5um; the aluminum foil is 10um; the prism layer top glue is 120°, 20um high, 70um wide, and the aluminum plating thickness is 100nm;

[0057] 2. The thickness of the pressure-sensitive adhesive layer of the water-blocking adhesive is 40um. Due to the groove structure of the prism, the adhesive layer penetrates into the prism after being compounded with the composite aluminum foil substrate. The total thickness of the tape is 80um.

[0058] The composition of the water-blocking adhesive layer is as follows: 50 parts of acrylic pressure-sensitive adhesive (Kunshan Shimei, PS8230), 30 parts of polyolefin elastomer (Mitsui Chemicals, A-20070, MI value 18), 15 parts of inorganic filler (Suzhou Napu, NS-BN, sheet diameter 2um), 10 parts of tackifying resin (Arakawa Chemical, 803L, terpene phenol resin), 0.5 parts of antioxidant (BASF, 1010), 0.5 parts of light stabilizer (Lianlon, 622), and 0.6 parts of cross-linking agent (Kunshan Shimei, PX23000A).

[0059] Example 3

[0060] The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules in this embodiment comprises, from top to bottom:

[0061] 1. The total thickness of the composite aluminum foil substrate layer is 50um, of which the back side is 15um PET release surface with a release force of 15g / inch; the thickness of the polyurethane adhesive layer is 5um; the aluminum foil is 10um; the prism layer top glue is 120°, 20um high, 70um wide, and the aluminum plating thickness is 100nm;

[0062] 2. The thickness of the pressure-sensitive adhesive layer of the water-blocking adhesive is 40um. Due to the groove structure of the prism, the adhesive layer penetrates into the prism after being compounded with the composite aluminum foil substrate. The total thickness of the tape is 80um.

[0063] The composition of the water-blocking adhesive layer is as follows: 50 parts of acrylic pressure-sensitive adhesive (Kunshan Shimei, PS8230), 20 parts of polyolefin elastomer (Dow Chemical, XUS 38678, MI value 9), 20 parts of inorganic filler (Suzhou Napu, NS-BN, sheet diameter 2um), 10 parts of tackifying resin (Arakawa Chemical, 803L, terpene phenol resin), 0.5 parts of antioxidant (BASF, 1010), 0.5 parts of light stabilizer (Lianlong, 622), and 0.6 parts of cross-linking agent (Kunshan Shimei, PX23000A).

[0064] Example 4

[0065] The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules in this embodiment comprises, from top to bottom:

[0066] 1. The total thickness of the composite aluminum foil substrate layer is 50um, of which the back side is 15um PET release surface with a release force of 15g / inch; the thickness of the polyurethane adhesive layer is 5um; the aluminum foil is 10um; the prism layer top glue is 120°, 20um high, 70um wide, and the aluminum plating thickness is 100nm;

[0067] 2. The thickness of the pressure-sensitive adhesive layer of the water-blocking adhesive is 40um. Due to the groove structure of the prism, the adhesive layer penetrates into the prism after being compounded with the composite aluminum foil substrate. The total thickness of the tape is 80um.

[0068] The composition of the water-blocking adhesive layer is as follows: 50 parts of acrylic pressure-sensitive adhesive (Kunshan Shimei, PS8230), 20 parts of inorganic filler (Suzhou Napu, NS-BN, sheet diameter 2um), 10 parts of tackifying resin (Arakawa Chemical, 803L, terpene phenol resin), 0.5 parts of antioxidant (BASF, 1010), 0.5 parts of light stabilizer (Lianlong, 622), and 0.6 parts of cross-linking agent (Kunshan Shimei, PX23000A).

[0069] Example 5

[0070] The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules in this embodiment comprises, from top to bottom:

[0071] 1. The total thickness of the composite aluminum foil substrate layer is 50um, of which the back side is 15um PET release surface with a release force of 15g / inch; the thickness of the polyurethane adhesive layer is 5um; the aluminum foil is 10um; the prism layer top glue is 120°, 20um high, 70um wide, and the aluminum plating thickness is 100nm;

[0072] 2. The thickness of the pressure-sensitive adhesive layer of the water-blocking adhesive is 40um. Due to the groove structure of the prism, the adhesive layer penetrates into the prism after being compounded with the composite aluminum foil substrate. The total thickness of the tape is 80um.

[0073] The composition of the water-blocking adhesive layer is as follows: 50 parts of acrylic pressure-sensitive adhesive (Kunshan Shimei, PS8230), 30 parts of polyolefin elastomer (Mitsui Chemicals, A-20070, MI value 18), 10 parts of tackifying resin (Arakawa Chemical, 803L, terpene phenol resin), 0.5 parts of antioxidant (BASF, 1010), 0.5 parts of light stabilizer (Rianlon, 622), and 0.6 parts of cross-linking agent (Kunshan Shimei, PX23000A).

[0074] Evaluation method:

[0075] The coherent performance of the composite aluminum foil water-blocking tape for the photovoltaic module frame is tested and the evaluation method is as follows:

[0076] (1) 180° peel strength: GB / T2792-2014 Test method for peel strength of adhesive tapes.

[0077] (2) PCT aging 180° peel strength:

[0078] The tape was attached to the SUS mirror steel plate, and the PCT aging box test conditions were 121°C, 100% relative humidity, 24 hours, and then the tape was taken out and left to stand at room temperature for 1 hour to test the peeling strength.

[0079] (3) DH500 aging 180° peel strength:

[0080] The tape was attached to the SUS mirror steel plate, and the DH aging box test conditions were 85°C, 85% relative humidity, 500H. The tape was taken out and left to stand at room temperature for 1H to test the peeling strength.

[0081] (4) HF10 aging 180° peel strength:

[0082] The tape was attached to the SUS mirror steel plate, and the HF aging box test conditions were 85% relative humidity, temperature -40 ~ 85 ° C, cycled 10 times, and then taken out and left to stand at room temperature for 1 hour to test the peeling strength.

[0083] Water vapor transmission rate: GB / T 15331-2020 Test method for water vapor transmission rate of pressure-sensitive adhesive tapes

[0084] The test results are shown in Table 1 below:

[0085]

[0086] Specifically, it can be seen from Table 1 that, compared with Example 1, too much inorganic filler affects the initial adhesion, Example 2 has a more balanced adhesion, better aging peel strength, and the lowest water vapor permeability; Example 3 and Example 4 reduce the proportion of polyolefin, and the water barrier property is significantly reduced; Example 5 does not add inorganic fillers, and the water vapor permeability of the tape is significantly increased.

[0087] In summary, the composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules and its preparation method combine the composite substrate layer with the water-blocking adhesive layer, and utilize the characteristic that the structural direction of the aluminum-plated prism layer in the composite substrate layer is parallel to the module edge sealing direction to block the possibility of water vapor entering from the cross section of the water-blocking adhesive layer. At the same time, the setting of the prism structure also increases the contact area with the water-blocking adhesive layer, and no residual adhesive is left after high-temperature processing, thereby comprehensively improving the aging resistance of photovoltaic modules.

[0088] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules, characterized in that: include: A laminated composite substrate layer and a water-blocking adhesive layer; The composite substrate layer comprises a silicone oil pre-treated PET layer, a bonding layer, an aluminum foil layer and an aluminum-plated prism layer stacked in sequence; The water-blocking adhesive layer is prepared from the following components in parts by mass: 40-70 parts of acrylic pressure-sensitive adhesive, 20-40 parts of polyolefin elastomer, 10-30 parts of inorganic filler, 5-15 parts of tackifying resin, 0.5-2 parts of antioxidant, 0.2-1 parts of light stabilizer, and 0.3-1.5 parts of cross-linking agent.

2. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The thickness of the composite substrate layer is 30-80 μm; The thickness of the water-blocking adhesive layer is 20-100 μm.

3. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The silicone oil pretreated PET layer is a release film with a silicone oil release agent coated on one side of PET, comprising an outer silicone release layer and an inner transparent PET layer adjacent to the adhesive layer; and The release force of the silicone oil pre-treated PET layer is 10-20 g / inch.

4. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The adhesive layer includes any one or more combinations of epoxy, hot melt adhesive and polyurethane adhesive.

5. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The thickness of the aluminum foil layer is 6-50 μm.

6. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The aluminum-plated prism layer includes a plurality of triangular prism structures arranged in parallel and formed by photocuring on the aluminum foil layer; The structural direction of the triangular prism is parallel to the edge sealing direction of the component, the bottom width of the triangular prism is 50-200 μm, and the top angle of the triangular prism is any one or more combinations of 90°, 120° and 150°; and The thickness of the aluminum plated on the aluminum plated prism layer is 50-200 nm.

7. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The molecular weight of the acrylic pressure-sensitive adhesive is 300,000-800,000; The polyolefin elastomer has a melt index of 10-20 g / 10 min.

8. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The inorganic filler is a flaky inorganic filler, including any one or more combinations of alumina, hydrotalcite, calcium carbonate, graphene and boron nitride, and the particle size ranges from 500 nm to 10 μm.

9. The composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to claim 1, characterized in that: The tackifying resin includes any one or more combinations of rosin resin, petroleum resin and terpene resin; The antioxidant includes any one or a combination of two of a hindered phenol antioxidant and an aromatic amine antioxidant; The light stabilizer includes any one or a combination of two of an ultraviolet light absorber and a hindered amine light stabilizer; The cross-linking agent includes any one or more combinations of aliphatic isocyanate, alicyclic diisocyanate and epoxy curing agent.

10. A method for preparing the composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules according to any one of claims 1 to 9, characterized in that: The steps include: Step S1, pre-treating a single-sided silicon PET film, bonding it to an aluminum foil layer through an adhesive layer, making a light-cured prism structure on the other side of the aluminum foil layer, and then plating an aluminum layer on the prism surface to obtain a composite aluminum foil substrate layer; Step S2, pre-dissolving the polyolefin elastomer with a solvent until it is uniform for use, then adding it to the acrylic pressure-sensitive adhesive according to the added amount and stirring evenly, and respectively adding an inorganic filler, a tackifying resin, an antioxidant, a light stabilizer and a cross-linking agent and stirring evenly to obtain a water-blocking adhesive; Step S3, coating the water-blocking adhesive on the composite aluminum foil substrate layer, drying it in an oven with a coating machine, and directly rolling it up to obtain a composite aluminum foil water-blocking tape for edge sealing of photovoltaic modules.

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