JP2014170899A - Water cut-off tape for solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cut-off tape for a solar cell module which is excellent in fixability between a solar cell panel body and a frame, excellent in maintainability and recyclability of a solar cell module, and has a function in which, even when moisture temporarily ingresses in the fixed interface, the water cut-off tape itself absorbs the moisture and swells to fill small gaps.SOLUTION: There are provided a core material and a water cut-off tape for a solar cell module formed by adhering a strong adhesive layer and a weak adhesive layer to the surface of the core material so as to pinch the core material. The weak adhesive layer is composed of a silicon composition.

Description

  The present invention relates to a waterproofing tape for a solar cell module.

  A solar cell module generally has a transparent glass substrate, a sealing material (filler), a solar cell (a base material such as a silicon-based semiconductor or a compound thereof), a sealing material (filler), and a back sheet from the upper surface facing the sun. A structure in which the layers are stacked in this order (hereinafter referred to as “solar cell panel body” or simply “solar cell panel”) is assembled to the frame. And since a solar cell module causes failures, such as a fall of conversion efficiency, with water | moisture content, such as rain water and water vapor | steam, it is necessary to ensure the water stop performance between a solar cell panel main body and a flame | frame.

  As a means for preventing water from entering the solar cell panel body, for example, as described in Japanese Patent Application Laid-Open No. 2000-124491 (Patent Document 1), a silicone system is provided in the gap between the solar cell panel body and the frame. It is common practice to inject a sealing material such as. For the same purpose, for example, as described in Japanese Patent Application Laid-Open No. 2005-200906 (Patent Document 2), an adhesive tape such as butyl rubber or acrylic is applied to the end of the solar cell panel body to the frame. Incorporation is generally done.

  However, since the method described in Patent Document 1 processes a slight gap between the solar cell panel main body and the frame, it is very difficult to completely inject the sealing agent over the entire periphery of the solar cell module. The reliability of the processing could not be secured sufficiently. In addition, since it takes time for the injection work and for hardening after the injection, the workability is also poor. In the case where the solar cell panel body and the frame are separated for repair, replacement or recycling of the solar cell module, the higher the water-stopping performance of the sealing material, the stronger the solar cell panel body and frame are. There arises a problem that the workability of the separation is reduced).

  In addition, in the case of attaching a butyl rubber-based or acrylic-based adhesive tape to the end portion of the solar cell panel main body as in the technique described in Patent Document 2 to stop water, the solar cell panel main body and the frame are attached to the adhesive tape. However, for this purpose, a design such as improving the adhesive strength of the adhesive tape or increasing the thickness of the adhesive layer is applied. However, when this attaches a solar cell panel main body to a flame | frame, the resistance of insertion becomes large by adhesion, and the problem that this attachment becomes extremely difficult arises. In addition, as a countermeasure for this, it is conceivable that the base material of the tape is foamed foam. However, foamed foam is likely to be distorted by long-term use (long-term deformation). A gap is generated between the two. And since conventional adhesive tapes such as butyl rubber and acrylic do not have a core material, when attaching the adhesive tape to the end of the solar cell panel by hand, The tape thickness is likely to be uneven, and as a result, there may be a case where a sufficient water stop performance cannot be obtained with a slight gap.

  Moreover, as described in Patent Document 2, the solar cell module is assumed to be installed outdoors and used for a long period of time. Therefore, an adhesive tape such as butyl rubber or acrylic (especially an adhesive layer) ) Is inferior in weather resistance and long-term stability, and is therefore deteriorated by long-term use, and there is a concern that the water stopping performance may be lowered.

  As a result, a method of injecting a silicone-based sealant into the gap between the solar cell panel body and the frame and a method of attaching a butyl rubber-based or acrylic adhesive tape to the end of the solar cell panel body and incorporating it into the frame In any case, in the case where water has entered the fixed interface even slightly, the water stopping performance is significantly lowered. Once this state has been reached, it is not possible to recover the water stopping performance, so it was necessary to re-fix the solar cell panel body and the frame (repair the solar cell module).

JP 2000-124491 A Japanese Patent Laying-Open No. 2005-200946

  In view of the above circumstances, the object of the present invention is to fix the solar cell panel body and the frame, and to maintain and recycle the solar cell module. Furthermore, moisture is temporarily contained in the fixed interface. Even in the case of being closed, the object is to provide a waterproof tape for a solar cell module having a function of absorbing and swelling the waterproof tape itself to fill a slight gap.

  The waterproofing tape for a solar cell module of the present invention is a waterproofing tape for a solar cell module in which a core material and a strong adhesive layer and a weak adhesive layer are bonded to the surface of the core material so as to sandwich the core material. And the said weak adhesion layer is achieved effectively by comprising a silicone composition. The waterproofing tape for solar cell modules is a waterproofing tape for solar cell modules in which a core material and a strong adhesive layer and a weak adhesive layer are bonded to the surface of the core material so as to sandwich the core material. In addition, the weak adhesive layer is made of a silicone composition and is effectively achieved by including a water-absorbing resin.

  Furthermore, the water-stopping tape for solar cell modules of the present invention includes the water-absorbing resin further contained in the strong adhesive layer, or the surface of each of the strong adhesive layer and the weak adhesive layer is further provided with a surface protective film. By sticking or the core material is selected from polyester resin, polyethylene resin, polypropylene resin, polyvinyl chloride, epoxy resin, silicone resin, phenol resin, polyimide, polyester or polycarbonate Or the particle size of the water absorbent resin is 20 to 400 μm, and the blending amount of the water absorbent resin is 1 to 200 parts by weight with respect to 100 parts by weight of the weak adhesive layer, or The strong adhesive layer is either a silicone adhesive, acrylic adhesive, urethane adhesive, or rubber adhesive By being selected, or when the thickness of the strong adhesive layer is 10 to 200 μm, or the particle size of the water absorbent resin is 20 to 400 μm, and the blending amount of the water absorbent resin is the strong adhesive layer. It is more effectively achieved by being 1 to 200 parts by weight with respect to 100 parts by weight of the layer.

  According to the present invention, it has become possible to provide a waterproof tape that can protect a solar cell module from moisture for a long period of time.

  Moreover, in the waterproofing tape for solar cell modules which concerns on this invention, suppression of a PID phenomenon (Potential Induced Degradation) is anticipated.

It is sectional drawing of the waterproofing tape for solar cell modules which concerns on this invention. It is a schematic sectional drawing which shows fixation of the solar cell panel main body at the time of using the water-stop tape for solar cell modules which concerns on this invention. It is the schematic which showed the water stop effect by the expansion | swelling of the water absorbing resin mix | blended with the water stop tape for solar cell modules which concerns on this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a waterproofing tape for solar cell modules (hereinafter sometimes simply referred to as “waterproofing tape”) 1 of the present invention. In the waterproofing tape 1 for a solar cell module, the strong adhesion layer 3 and the weak adhesion layer 4 are bonded to both surfaces of the core material 2. Further, a protective film 5 is attached to protect the surfaces of the strong adhesive layer 3 and the weak adhesive layer 4.

  Next, each component shown in FIG. 1 will be described.

  First, a synthetic resin sheet is suitable for the core material 2, but woven fabric, non-woven fabric, mesh, knitted fabric, paper, or the like can also be used. In addition, about the manufacturing method of the core material 2, it does not specifically limit. In addition, the core material 2 is subjected to a pretreatment (primer treatment) for the purpose of stronger adhesion between the strong adhesive layer 3 and the weak adhesive layer 4, and the components between the strong adhesive layer 3 and the weak adhesive layer 4. Processing to prevent migration can be performed.

  Examples of the material of the core material 2 include polyester resins such as polyethylene terephthalate, polyethylene resins, polypropylene resins, polyvinyl chloride, epoxy resins, silicone resins, phenol resins, polyimides, polyesters, polycarbonates, celluloses, nonwoven fabrics, and woven fabrics. Examples thereof include cloth, and among them, polyethylene, polypropylene, polyvinyl chloride, and polyester are preferable because they are excellent in flexibility. Furthermore, among the polyester resins, polyethylene terephthalate is preferable. A plurality of these can be used in combination.

  If the thickness of the core material 2 is thin, the insulating property of the resulting water-stopping tape may be lowered. If it is thick, the flexibility of the water-stopping tape obtained is lowered, but generally the thickness is 5 to 500 μm. 10-100 micrometers is preferable when the followable | trackability with respect to the solar cell panel main body and flame | frame of the water-stop tape for solar cell modules which concerns on this invention is considered.

  Next, the strong adhesion layer 3 and the weak adhesion layer 4 are demonstrated.

  The strong adhesive layer 3 uses a polymer material such as a silicone adhesive, an acrylic adhesive, a urethane adhesive, and a rubber adhesive (natural rubber, styrene butadiene rubber, butadiene rubber, butyl rubber, acrylic rubber, chloroprene rubber). be able to.

  The weak adhesion layer 4 is a silicone composition. If the silicone composition is a liquid silicone, the type (for example, straight silicone, modified silicone, etc.) and shape (chain, ring, etc.), and the silicone composition in the silicone composition There are no particular restrictions on the molecular weight. The liquid silicone composition may be used alone or in combination of two or more types of silicones having different structures and molecular weights. In the case of using a mixture of two or more types of silicone, for example, an addition reaction type produced by an addition reaction of an alkenyl group-containing organopolysiloxane and an organohydrogenpolysiloxane under a platinum catalyst (the platinum catalyst will be described later). Although the use of a silicone composition is preferred, there is no need to be particularly concerned with an addition reaction type silicone composition. For the silicone composition, a vulcanizing agent or a peroxide-based crosslinking agent can be used as appropriate.

  The thickness of the strong adhesion layer 3 should just be 10 micrometers-200 micrometers, respectively, Furthermore, 10-50 micrometers is more preferable. Moreover, the thickness of the weak adhesion layer 4 should just be 200 micrometers-3 mm. These numerical limits can be set as appropriate in consideration of the dimensions of the opening of the frame 6 (see FIG. 2) and the thickness and dimensions of the solar cell panel body 7 (see FIG. 2).

  A water-absorbing resin (not shown) can be added to the strong adhesive layer 3 and the weak adhesive layer 4. By adding a water-absorbing resin, an improvement in the water-stopping effect between the solar cell panel body and the frame is expected. The type of the water-absorbent resin used in the present invention can be appropriately selected according to the water-stopping performance required for the water-stopping tape to be manufactured, and is not particularly limited. For example, in polyacrylic acid Japanese cross-linked product, self-crosslinked polyacrylic acid neutralized product, starch-acrylic acid graft copolymer cross-linked product, starch-acrylonitrile graft copolymer cross-linked hydrolyzate, acrylate-acrylamide copolymer cross-linked product , Cross-linked product of acrylic acid-2-acrylamido-2-methylpropane sulfonate, cross-linked product of isobutylene-maleic anhydride copolymer, cross-linked carboxymethyl cellulose salt, water-insoluble polyethylene oxide resin and water insoluble Polyethylene oxide resin or polyvinyl alcohol, polyvinyl formal, polyvinyl chloride Butyral and water absorbing resin such as a cross-linked product thereof can be used. In particular, a polymer of neutralized polyacrylic acid is preferable because of excellent heat resistance.

  The particle size of the water-absorbent resin can be appropriately selected and is preferably 20 μm to 400 μm, more preferably 20 to 70 μm. Moreover, you may combine the water absorbing resin of a several particle size. Incidentally, when the water-absorbent resin has a particle size of 20 μm or less, a water-stopping (water-absorbing) effect is not expected, and when the protective film 5 is peeled off, the strong adhesive layer 3 and / or the weak adhesive layer 4 is used. May peel off from the core material. Further, when the particle size of the water-absorbent resin is 400 μm or more, the protective film 5 is sufficiently releasable, but between the frame 6 (see FIG. 2) and the solar cell panel body 7 (see FIG. 2). There is a concern that a gap will be formed and the water stop effect will be worsened.

  The amount of the water-absorbing resin is preferably 1 to 200 parts by weight, more preferably 5 to 30 parts by weight, based on 100 parts by weight of the silicone composition (material related to the weak adhesive layer 4). If the added amount of the water-absorbent resin is less than 1 part by weight, the water-absorbing effect is reduced. Conversely, if it is more than 200 parts by weight, the expansion rate increases, but the abundance ratio of rubbers is relatively reduced. This is because the mechanical properties and insulation may be reduced.

  In addition, it is difficult to measure how much the volume actually expands, but it can be taken into account by the rate of change in weight when immersed in water, and the amount of water-absorbent resin added is determined based on this. . What is necessary is just to select the addition amount of a water absorbing resin so that the weight change at the time of water immersion may become a value of the range of 100 to 150% on the basis of the weight of the water-stopping tape at the time of manufacture. Here, the reason that “the weight change when immersed in water is a value in the range of 100 to 150%” is because if the weight change rate is too small, the water stop performance may be deteriorated. On the other hand, if the weight change rate is too large, the mechanical characteristics are lowered, and the fixing performance may be lowered.

  Moreover, the addition of the water-absorbing resin can also be expected to have an effect of suitably forming a mat (with fine irregularities on the surface) without impairing the adhesive strength of the surfaces of the strong adhesive layer 3 and the weak adhesive layer 4. Incidentally, the mat-like surface refers to a state that is not a so-called mirror surface (smooth surface), and preferably refers to a state where the surface roughness is about Ra = 0.2 to 15 μm. The effects resulting from the matte surfaces of the strong adhesive layer 3 and the weak adhesive layer 4 will be described later in detail.

  Furthermore, inorganic fillers such as silica, alumina, aluminum hydroxide, magnesia, magnesium hydroxide, boron nitride, aluminum nitride, and other organic fillers (resin beads, etc.) are used as fillers in the strong adhesive layer 3 and the weak adhesive layer 4. It is possible to appropriately select or combine a plurality of fillers. By adding these fillers, the surfaces of the strong adhesive layer 3 and the weak adhesive layer 4 can be suitably matted, and the insulation is improved, the physical strength is improved, and the friction coefficient of the surface is adjusted. can do. The blending amount of the filler is 3 to 1000 parts by weight, more preferably 10 to 500 parts by weight with respect to 100 parts by weight of the base polymer, that is, the strong adhesive layer and / or the weak adhesive layer. However, these compounding amounts can be arbitrarily changed depending on the density, particle diameter, and particle shape of the filler or the roughness required for the surfaces of the strong adhesive layer 3 and the weak adhesive layer 4.

  In addition, for the strong adhesive layer 3 and the weak adhesive layer 4, foaming agents, antistatic agents, anti-deterioration agents for ultraviolet rays, tackifiers, adhesion promoters, and the like can be used. The agent is not particularly limited. In addition, it cannot be overemphasized that these organic type fillers, the said inorganic type filler, and the said water absorbing resin can be used together.

  Next, the surface protection film 5 will be described.

  Since the surface protective film 5 is suitably matte due to the combination of the inorganic filler and / or the water-absorbent resin, the surfaces of the strong adhesive layer 3 and the weak adhesive layer 4 are suitable for the protective film. The releasability is improved. For this reason, it is not necessary to use a protective film that has been coated with a silicone-based release agent or a fluorine-based release agent that is generally used to protect an adhesive surface such as an adhesive tape, and has improved releasability. The result is excellent in cost. Moreover, the protective film which apply | coated this silicone type mold release agent or fluorine type mold release agent can also be used for the further improvement of workability | operativity.

  The surface protective film 5 has a smooth (mirror surface) shape, but a decorated one such as embossing can also be used. The shape of the surface of the protective film can also be transferred to the surface of the strong adhesive layer 3, the surface of the weak adhesive layer 4, or both.

  Next, with reference to FIG. 2, the attachment of the solar cell panel body 7 to the frame 6 using the water-stopping tape of the present invention and the water-stopping action of the present invention in this state will be described.

  FIG. 2 is a cross-sectional view showing a state in which the solar cell panel body 7 is attached to the frame 6 using the water-stopping tape 1 of the present invention. The mode of FIG. 2 illustrates that the solar cell panel body 7 is fitted to the frame 6 via the adhesive sheet of the present invention. As a working method at this time, first, after the protective film 5 on the strong adhesive layer 3 of the waterproofing tape 1 according to the present invention is peeled (released), the surface of the strong adhesive layer is the surface of the solar cell panel body 7. Stick it so that it comes to the end. At this time, care should be taken so that air does not enter between the layers (at this time, vacuum depressurization or the like can be performed). Then, after peeling off and removing the protective film 5 on the weak adhesive layer 4 side, the solar cell panel body 7 with the waterproof tape 1 according to the present invention attached thereto is inserted into the opening of the frame 6 and fitted. . Comparing the dimension of the opening of the frame 6 and the thickness dimension of the solar cell panel body 7 to which the waterproof tape 1 of the present invention is adhered, the panel side is larger and is in an interference fit state. The battery panel main body 7 is firmly integrated, and as a result, it is possible to prevent water such as rainwater and water vapor from entering the solar battery panel main body. At this time, it is the surface of the weak adhesive layer 4 in the water-stopping tape 1 that directly contacts the opening of the frame 6, but as described above, the roughness and adhesiveness of the surface are suitably adjusted to be mat-like and weakly adhesive. Therefore, it can be installed quickly. At this time, even if the surface of the water-stopping tape 1 is scratched due to friction with the frame and a slight gap is formed, the contained water-absorbing resin is exposed, so that moisture such as rainwater can be more effectively removed. To stop the water. In other words, in a situation where there is a concern that a general-purpose butyl rubber-based / acrylic-based adhesive tape has a gap in the construction and the water-stopping performance is lowered, the water-stopping performance of the water-stopping tape according to the present invention is highly reliable. I can say that.

  Note that FIG. 2 shows only one side of the rectangular solar cell module. Actually, it is necessary to apply the same processing to the entire outer periphery, and each frame is connected to the four corners. Note that the parts are used together. Needless to say, the non-rectangular solar cell module is effective only when the frame and the solar cell panel main body are combined with the solar cell module.

  FIG. 3 shows the water-stopping tape 1 of the present invention, in which the water-absorbing resin 8 in the water-stopping tape expands, between the frame 6 and the water-stopping tape 1 of the present invention, and the solar cell panel body 7 and the water-stopping tape FIG. 1 is a conceptual diagram (cross-sectional view) illustrating a place where a gap generated with 1 is filled. The water-absorbing resin 8 that absorbs and swells the gap generated by the use of the solar cell module and the slight gap generated when the solar cell panel body 7 is inserted and fitted into the frame 6 absorbs moisture in the outside air and expands. Thus, the state of filling the gap is illustrated. This function protects the solar cell module from external moisture for a long time.

  Based on the above, the waterproofing tape for solar cell modules according to the present invention is established.

  As mentioned above, although the outline was described about the waterproofing tape for solar cell modules concerning the present invention, the embodiment of the present invention is not this limit, unless it deviates from the range of a claim, this specification, and a drawing, Various embodiments are possible.

Hereinafter, examples (Examples 1 to 8 and Comparative Examples 1 and 2) according to the waterproofing tape for solar cell modules of the present invention (simply referred to as “waterproofing tape”) will be described in detail. Examples are not limited to these examples. Further, when describing the present embodiment, description will be made using the reference numerals and the like described in FIGS. 1 to 3 as necessary.
[Production Example] Preparation of water-stopping tape according to Examples 1 to 8 As a preparation procedure of the water-stopping tape according to Examples 1 to 8, first, a water-absorbing resin was blended as a strong adhesive layer 3 on one side of the core material 2. Silicone rubber (silicone) obtained by laminating the obtained silicone-based pressure-sensitive adhesive so that the thickness (thickness of the strong adhesive layer 3) is 80 μm, and further blending a water-absorbing resin as the weak adhesive layer 4 on the other side of the core material The composition) was laminated so that the thickness (thickness of the weak adhesive layer 4) was 800 μm, so that the waterproofing tape according to Examples 1 to 8, ie, the present invention was obtained. In addition, the kind of material used for each component which concerns on the water stop tape which concerns on Example 1 thru | or 8 shows the compounding ratio etc. in following Table 1.

  In Table 1, the main components of the strong adhesive layer 3 in Examples 1 to 4, 6, 7, and 8 are all unified to the same silicone adhesive, and in Example 5, the silicone adhesive is used. Instead, an acrylic adhesive was used. Further, among the water-absorbing resins added to the strong adhesive layer 3 in Examples 1 to 8, in the crosslinked polyacrylic acid product, the particle diameter was unified to 30 μm. Silica having a particle size of 50 μm was used. The blending amount (parts by weight) of the water-absorbing resin added to the strong adhesive layer 3 is a value when the silicone-based adhesive constituting the strong adhesive layer 3 is 100 parts by weight.

  In Table 1 above, the same silicone rubber was used as the main component of the weak adhesive layer 4 in Examples 1 to 8. Further, the water-absorbent resin added to the weak adhesive layer 4 in Examples 1 to 8 was unified into a crosslinked polyacrylic acid product having a particle size of 30 μm. The blending amount (parts by weight) of the water-absorbing resin added to the weak adhesive layer 4 is a value when the silicone rubber forming the weak adhesive layer 4 is 100 parts by weight.

  In addition, as the water-stopping tape in Comparative Example 1, a commercially available butyl rubber tape was used, and in Comparative Example 2, a commercially available silicone sealing agent was used.

[Test Example] Durability Test at High Temperature and High Humidity Next, the waterproofing tape according to Examples 1 to 8 produced in the above production example, the commercially available butyl rubber tape according to Comparative Example 1, and Comparative Example 2 With respect to such a commercially available silicone sealant, a durability test was conducted under high temperature and high humidity (1 atm, air temperature 60 ° C., humidity 85%).

  First, using a water-stopping tape according to Examples 1 to 8, a commercially available butyl rubber tape according to Comparative Example 1, and a commercially available silicone sealing agent according to Comparative Example 2, respectively, a solar cell panel body 7 and a frame 6 were joined as shown in FIG. 2 to obtain a solar cell module test piece. Moreover, in Example 8, the fitting part of the solar cell panel main body 7 and the frame 6 is scratched in the gap generated by long-term use so that it can be easily submerged. It assembled | attached using the tape.

  And as a durability test, it generated with the solar cell module in each Example and each comparative example in the said high temperature, high humidity environment, and evaluated the electric power generation amount before and behind this test, an external appearance change, etc. The test results are shown in Table 2 below.

  In Table 2 above, “Good (good)” means that there is no decrease in the power generation amount before or after the durability test, or only a slight decrease in the power generation amount in the power reduction. In the water stop, it is shown by visual inspection that there is no water immersion and that there is no disconnection due to water immersion. In addition, “× (unsatisfactory)” indicates that the amount of power generation was significantly reduced or the power generation was impossible when the power was reduced, and that the water stop was inundated by visual inspection. It indicates that a disconnection or the like caused by flooding has occurred. In addition, as a supplement to these test results, the section “Result (Consideration)” is provided in Table 2 above.

  As a result, in Examples 1 to 8, it was generally good. Further, in Comparative Example 1, it was unsatisfactory. Moreover, in Comparative Example 2, although it was good, the result was that it was extremely difficult to disassemble the test piece.

  The waterproofing tape for solar cell module according to the present invention enables the solar cell module to be protected from moisture for a long period of time, and also requires waterstop based on the principle of the waterproofing tape according to the present invention. It can also be used for joining various parts.

1 Water-stop tape for solar cell modules (water-stop tape)
2 Core material 3 Strong adhesive layer 4 Weak adhesive layer 5 Surface protective film 6 Frame 7 Solar cell panel body 8 Water-absorbing and water-absorbing resin

Claims (9)

  A waterproofing tape for a solar cell module comprising a core material and a strong adhesive layer and a weak adhesive layer adhered to the surface of the core material so as to sandwich the core material, wherein the weak adhesive layer is a silicone composition A waterproofing tape for a solar cell module, comprising:   A waterproofing tape for a solar cell module comprising a core material and a strong adhesive layer and a weak adhesive layer adhered to the surface of the core material so as to sandwich the core material, wherein the weak adhesive layer is a silicone composition A waterproofing tape for a solar cell module, comprising a water-absorbing resin.   The waterproofing tape for solar cell modules according to claim 2, wherein the water absorbent resin is further contained in the strong adhesive layer.   The waterproofing tape for solar cell modules according to any one of claims 1 to 3, wherein a surface protective film is further attached to the surface of each of the strong adhesive layer and the weak adhesive layer.   5. The core material according to claim 1, wherein the core material is selected from polyester resin, polyethylene resin, polypropylene resin, polyvinyl chloride, epoxy resin, silicone resin, phenol resin, polyimide, polyester, or polycarbonate. The waterproofing tape for solar cell modules of item 1.   The particle diameter of the water absorbent resin is 20 to 400 µm, and the amount of the water absorbent resin is 1 to 200 parts by weight with respect to 100 parts by weight of the weak adhesive layer. The waterproofing tape for solar cell modules as described in a term.   The waterproofing tape for solar cell modules according to any one of claims 1 to 6, wherein the strong adhesive layer is selected from any one of a silicone-based adhesive, an acrylic adhesive, a urethane-based adhesive, and a rubber-based adhesive. .   The waterproofing tape for solar cell modules according to any one of claims 1 to 7, wherein the strong adhesive layer has a thickness of 10 to 200 µm.   The particle size of the water absorbent resin is 20 to 400 µm, and the amount of the water absorbent resin is 1 to 200 parts by weight with respect to 100 parts by weight of the strong adhesive layer. The waterproofing tape for solar cell modules as described in a term.

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