Preparation method of local photocuring photovoltaic adhesive film and curing equipment

Abstract

The invention provides a preparation method of a local photocuring photovoltaic adhesive film and curing equipment, and belongs to the technical field of photovoltaic packaging adhesive films. A preparation method of a locally photocured photovoltaic adhesive film comprises the following steps: weighing resin, a photoinitiator, a main cross-linking agent, an auxiliary cross-linking agent, a coupling agent, a light stabilizer and an antioxidant in parts by mass, uniformly blending, carrying out a film casting process to prepare the photovoltaic adhesive film, and carrying out local photocuring on the adhesive film by irradiating ultraviolet light which is arranged in a warp and weft manner and has a specific wave band, so as to obtain the locally photocured photovoltaic adhesive film. Forming a non-continuous cross-linked area and a continuous non-cross-linked area, so as to obtain the local light-cured photovoltaic adhesive film. The method has the advantages that in the UV light irradiation process of the curing equipment on the adhesive film, the adhesive film is irradiated through the gaps, so that a plurality of warps are formed in the fixed area on the adhesive film, the warps are pre-crosslinked through UV light irradiation, the overall flowability of the adhesive film is reduced, the risk that a battery piece deviates in the lamination process of the assembly is reduced, the use of positioning adhesive tape is reduced, and the production cost is reduced. And the product yield is improved.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic encapsulation film technology, and relates to a method for preparing photovoltaic encapsulation films with local photocuring and a curing device. Background Technology

[0002] Current production processes use positioning tape to assist in the positioning of solar cells. Each module uses 20-28 sheets of tape, depending on the product specifications. The adhesive force between the tape and the adhesive film or solar cell helps position the cell and prevents it from shifting during lamination. However, in existing technologies, the adhesive film has high extensibility and flowability. During lamination, the heated adhesive film can cause the solar cell to shift. Furthermore, the positioning tape can crush the solar cell during manual or robotic application. The adhesive on the positioning tape can also generate air bubbles during lamination, reducing the module's yield. Additionally, applying the tape affects production efficiency and increases energy consumption. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a method for preparing photovoltaic encapsulant films using localized photocuring and a curing device. This method solves the problems of existing encapsulant films having high extensibility and fluidity, causing cell displacement due to heat flow during lamination, and the positioning tape breaking cells during manual or robotic application. Furthermore, the adhesive on the positioning tape generates air bubbles during lamination, resulting in a reduced module yield. Additionally, applying the tape affects production efficiency and increases energy consumption.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A method for preparing a locally photocurable photovoltaic film, characterized by comprising the following steps:

[0006] S1: Weigh out the resin, photoinitiator, main crosslinking agent, co-crosslinking agent, coupling agent, light stabilizer, and antioxidant according to the specified mass parts, and mix them evenly. The resin is 100 parts, the initiator is 0.1-5 parts, the main crosslinking agent is 0.2-1.5 parts, the co-crosslinking agent is 0.1-2.0 parts, the coupling agent is 0.01-2.0 parts, the light stabilizer is 0.1-1.0 parts, and the antioxidant is 0.01-0.2 parts.

[0007] S2: Photovoltaic encapsulant film is prepared by a casting process;

[0008] S3: Before the encapsulating film is wound up, it is locally photocured by irradiating it with ultraviolet light of a specific wavelength with a specific warp and weft arrangement, forming discontinuous cross-linked regions and continuous non-cross-linked regions. The area ratio of the discontinuous cross-linked regions is between 0.5% and 90%, thus obtaining a locally photocured photovoltaic film.

[0009] In the above-mentioned method for preparing a locally photocurable photovoltaic film, the resin includes EVA resin and POE resin;

[0010] The photoinitiator includes 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide, ethyl 2,4,6-trimethylbenzoylphosphonate, 2-methyl-1-[4-methylthiophenyl]-2-morpholino-1-propanone, 2-isopropylthioxanthone (a mixture of 2 and 4 isomers), 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, methyl o-benzoylbenzoate, benzophenone, 4-chlorobenzophenone, 4-phenyl Benzophenone and other structurally modified benzophenone initiators, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, benzoyl ester mixtures, 2-hydroxy-1-(4-(2-hydroxy-2-methylpropionylphenyl)benzyl)-2-methyl-1-propanone, bis(2,6-difluoro-3-pyrrolithophenyldicenoctane), and ethyl 4-dimethylaminobenzoate are any one or more combinations thereof;

[0011] The main crosslinking agent includes any one or more combinations of 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, tert-2-ethylhexyl carbonate, tert-butylperoxycarbonate-2-ethylhexyl, 1,1-di(tert-butylperoxy)cyclohexane, and tert-butyl peroxy-2-ethylhexanoate.

[0012] The co-crosslinking agent includes any one or a combination of triallyl isocyanurate, triallyl cyanurate, and trimethylolpropane triacrylate;

[0013] The coupling agent includes any one or more combinations of vinyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, methacrylate silane, and γ-aminopropyltriethoxysilane;

[0014] The light stabilizer includes any one or more combinations of light stabilizer 622, light stabilizer 770, light stabilizer 944, light stabilizer 783, light stabilizer 123, light stabilizer 765, light stabilizer 2908, light stabilizer 531, light stabilizer 327, and light stabilizer 328.

[0015] The antioxidant is one or more of aromatic amines, hindered phenols, and auxiliary antioxidants, such as any combination of one or more of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(4-nonylphenol) phosphite, and tris(2,4-di-tert-butylphenyl) phosphite.

[0016] In the above-mentioned method for preparing photovoltaic films by localized photocuring, the ultraviolet light band is 200nm-420nm.

[0017] A curing device for localized photocuring of photovoltaic encapsulant film, characterized in that it includes a curing device body, a guide frame plate symmetrically fixedly installed inside the curing device body, a fixed plate fixedly inserted into the center of the guide frame plate, a plurality of movable movable plates equidistantly arranged inside the guide frame plate and on both sides of the fixed plate, a gap corresponding to the width of the photovoltaic cell is formed between the fixed plate, the movable plates, and adjacent movable plates, and an adjustment mechanism is provided on the curing device body for driving the movable plates toward or away from the fixed plate.

[0018] In the aforementioned localized photocuring photovoltaic film curing equipment, the adjustment mechanism includes a fixing pin fixed at the middle of both ends of a fixed plate and a movable plate. Two hinge plates are rotatably sleeved on the outside of the fixing pin, and the ends of adjacent hinge plates are hinged to each other. Guide rods that slide and interlock with the curing equipment body are fixedly connected to both ends of the movable plate near the curing equipment body. A cylinder is fixedly installed on the curing equipment body, and the output end of the cylinder is fixedly connected to the end of one of the guide rods.

[0019] In the aforementioned localized photocuring photovoltaic film curing equipment, a guide sleeve fitted outside another guide rod is fixedly connected to the curing equipment body.

[0020] In the aforementioned localized photocuring photovoltaic film curing equipment, multiple ball bearings are rotatably embedded at both the top and bottom ends of the movable plate, and guide grooves for guiding and sliding the ball bearings are provided on both the top and bottom walls of the guide frame plate.

[0021] In the aforementioned localized photocuring photovoltaic film curing equipment, both ends of the curing equipment body are equipped with guide rollers for guiding and moving the film via bearing plates.

[0022] In the aforementioned localized photocuring photovoltaic film curing equipment, the fixed plate and the movable plate near the fixed plate are provided with a scale component for displaying the gap size. The scale component includes a scale plate and an indicator frame that is slidably sleeved on the scale plate. The scale plate is fixedly connected to a fixing pin on the fixed plate, and the indicator frame is fixedly connected to a fixing pin on the movable plate near the fixed plate.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] Before the encapsulating film is wound up, equidistant gaps corresponding to the width of the photovoltaic cell are used between the fixed plate and the movable plate, as well as between adjacent movable plates. During the UV irradiation of the film by the curing equipment, the film is irradiated through the gaps, causing multiple warp lines to form in a fixed area on the film. The warp lines are pre-crosslinked after being irradiated by UV light, which reduces the overall fluidity of the film, reduces the risk of cell displacement during the lamination process, reduces the use of positioning tape, lowers energy consumption, and improves product yield. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the connection structure between the fixed plate and the movable plate and the adjustment mechanism;

[0027] Figure 3 for Figure 2 Schematic diagram of the end structure of the fixed plate and the movable plate;

[0028] Figure 4 This is a schematic diagram of the connection structure between the movable plate and the guide frame plate.

[0029] In the picture,

[0030] 1. Curing equipment body; 2. Guide roller; 3. Fixed plate; 4. Movable plate; 5. Adjustment mechanism; 501. Fixing pin; 502. Hinge plate; 503. Guide rod; 504. Cylinder; 505. Guide sleeve; 6. Scale assembly; 601. Scale plate; 602. Indicator frame; 7. Guide frame plate; 701. Guide groove; 8. Ball bearing. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 4 As shown,

[0033] Example 1

[0034] This example provides a method for preparing a locally photocurable photovoltaic film, the steps of which are as follows:

[0035] After the materials are mixed evenly according to the mass proportions in the formula table, they are fed into the screw and formed by casting. During the winding stage, 200nm-300nm ultraviolet lamps are used to irradiate the material according to a certain warp and weft arrangement to obtain the finished product.

[0036] The resin particles used are Zhejiang Petrochemical V6110S, with a VA content of 29% and a melt index (MI) of 25; the light curing agent is 2-hydroxy-1-(4-(2-hydroxy-2-methylpropionylphenyl)benzyl)-2-methyl-1-propanone, CAS No.: 474510-57-1; the crosslinking agent is 1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane; the co-crosslinking agent is triallyl isocyanurate; the coupling agent is γ-methacryloyloxypropyltrimethoxysilane; the light stabilizer is light stabilizer 944; and the antioxidant is antioxidant 1076.

[0037] The recipe is as follows:

[0038] Host material 100 parts EVA Photocuring agent 3 parts Crosslinking agent 0.4 parts Co-crosslinking agent 0.25 parts Coupling agent 0.4 parts Light stabilizer 0.1 parts Antioxidant 0.1 parts

[0039] Example 2

[0040] This example provides a method for preparing a locally photocurable photovoltaic film, which differs from Example 1 in that the main materials and ultraviolet curing light source are changed. The steps are as follows:

[0041] After the materials are mixed evenly according to the mass proportions in the formula table, they are fed into the screw and formed by casting. During the winding stage, they are irradiated with 350nm-420nm ultraviolet lamps in a certain warp and weft arrangement to obtain the finished product.

[0042] The resin particles used are Formosa Plastics 7760S, with a VA content of 29% and a melt index (MI) of 25; the UV curing agent is 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide; the crosslinking agent is tert-butylperoxycarbonate-2-ethylhexyl ester; the co-crosslinking agent is trimethylolpropane triacrylate; the coupling agent is γ-methacryloyloxypropyltrimethoxysilane; the light stabilizer is light stabilizer 944; and the antioxidant is antioxidant 1076.

[0043] The recipe is as follows:

[0044] Host material 100 parts EVA Photocuring agent 0.6 parts Crosslinking agent 0.4 parts Co-crosslinking agent 0.3 parts Coupling agent 0.4 parts Light stabilizer 0.1 parts Antioxidant 0.1 parts

[0045] Example 3

[0046] This embodiment provides a UV curing device for photovoltaic panel adhesive films, such as... Figures 1-4 As shown, the photovoltaic panel adhesive film UV curing equipment includes a curing equipment body 1;

[0047] A guide frame plate 7 is symmetrically fixedly installed inside the curing equipment body 1. A fixed plate 3 is fixedly inserted into the middle of the guide frame plate 7. Multiple movable plates 4 are equidistantly arranged inside the guide frame plate 7 and on both sides of the fixed plate 3. A gap corresponding to the width of the photovoltaic cell is formed between the fixed plate 3, the movable plate 4, and adjacent movable plates 4.

[0048] When the adhesive film needs to be cured, the equidistant gaps between the fixed plate 3 and the movable plate 4, as well as between adjacent movable plates, corresponding to the width of the photovoltaic cell, are used. During the UV irradiation of the adhesive film by the curing equipment, the UV light shines through the gaps onto the adhesive film, causing multiple warp lines to form in a fixed area on the adhesive film. The warp lines undergo pre-crosslinking after being irradiated by UV light, which reduces the overall fluidity of the adhesive film, reduces the risk of cell displacement during the lamination process, reduces the use of positioning tape, lowers energy consumption, and improves product yield.

[0049] Example 4

[0050] Unlike Example 3, (where the gap may be greater or less than the width of the solar cell due to different types of photovoltaic panels), the curing equipment body 1 is equipped with an adjustment mechanism 5 for driving the movable plate 4 toward or away from the fixed plate 3. The adjustment mechanism 5 includes a fixing pin 501 fixed at the middle of both ends of the fixed plate 3 and the movable plate 4. Two hinge plates 502 are rotatably sleeved on the outside of the fixing pin 501. The ends of adjacent hinge plates 502 are hinged to each other. Both ends of the movable plate 4 near the curing equipment body 1 are fixedly connected to guide rods 503 that slide through the curing equipment body 1. A cylinder 504 is fixedly installed on the curing equipment body 1. The output end of the cylinder 504 is fixedly connected to the end of one of the guide rods 503.

[0051] When different types of photovoltaic panels have different cell widths, the output end of cylinder 504 drives guide rod 503 to move inward into cylinder 504. Cylinder 504 drives the outermost movable plate 4 to move. The outer movable plate 4, through the cooperation of hinge plate 502 and fixed pin 501, drives the inner movable plate 4 to move away from fixed plate 3, thereby increasing the gap. The output end of cylinder 504 drives guide rod 503 to move outward from cylinder 504. Cylinder 504 drives the outermost movable plate 4 to move. The outer movable plate 4, through the cooperation of hinge plate 502 and fixed pin 501, drives the inner movable plate 4 to move closer to fixed plate 3, thereby decreasing the gap.

[0052] Specifically, a guide sleeve 505 is fixedly connected to the curing equipment body 1 and sleeved outside another guide rod 503; the cooperation between the guide sleeve 505 and the guide rod 503 can provide support and movement guidance for the side of the movable plate 4 connected to the hinge plate 502 which is hinged to each other by the fixing pin 501.

[0053] Furthermore, multiple balls 8 are rotatably embedded at the top and bottom ends of the movable plate 4, and guide grooves 701 are provided on the top and bottom walls of the guide frame plate 7 to guide the balls 8 to slide. The balls 8 can reduce the friction between the movable plate 4 and the guide frame plate 7, and at the same time facilitate the movement of the movable plate 4 on the guide frame plate 7.

[0054] Furthermore, both ends of the curing equipment body 1 are equipped with guide rollers 2 for guiding and moving the adhesive film via bearing plates, which facilitates straightening of the adhesive film within the curing equipment body 1.

[0055] Furthermore, the fixed plate 3 and the movable plate 4 near the fixed plate 3 are provided with a scale component 6 for displaying the gap size. The scale component 6 includes a scale plate 601 and an indicator frame 602 slidably sleeved on the scale plate 601. The scale plate 601 is fixedly connected to the fixing pin 501 on the fixed plate 3, and the indicator frame 602 is fixedly connected to the fixing pin 501 on the movable plate 4 near the fixed plate 3. The initial value of the scale plate 601 starts from the side of the fixed plate 3. The indicator frame 602 and the side of the movable plate 4 are located in the same vertical plane. Through the cooperation of the indicator frame 602 and the scale plate 601, the gap size between the fixed plate 3 and the movable plate 4 can be indicated in real time, which facilitates the adjustment of the distance between the movable plate 4 and the fixed plate 3 according to the cooperation of the scale plate 601 and the indicator frame 602.

[0056] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0057] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Meanwhile, the word "and / or" throughout the text means including three solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0058] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0059] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for preparing a local photo-cured photovoltaic glue film, characterized in that, The method comprises the following steps: S1: Take resin, photoinitiator, main crosslinking agent, auxiliary crosslinking agent, coupling agent, light stabilizer and antioxidant by mass fraction, and then blend them respectively, wherein the resin is 100 parts, the initiator is 0.1-5 parts, the main crosslinking agent is 0.2-1.5 parts, the auxiliary crosslinking agent is 0.1-2.0 parts, the coupling agent is 0.01-2.0 parts, the light stabilizer is 0.1-1.0 parts, and the antioxidant is 0.01-0.2 parts; S2: A photovoltaic adhesive film is prepared by a casting film process; S3: Before the encapsulation adhesive film is wound, local photocuring is performed by irradiating specific ultraviolet light of specific wavebands arranged in specific weft and warp, to form a discontinuous crosslinking region and a continuous non-crosslinking region, and the area ratio of the discontinuous crosslinking region is between 0.5% and 90%, to prepare a locally photocured photovoltaic adhesive film.

2. The method of claim 1, wherein the method further comprises the step of applying a top layer of a light-cured photovoltaic adhesive film to the top surface of the first layer of the light-cured photovoltaic adhesive film. The resin comprises EVA resin and POE resin; The photoinitiator comprises any one or a combination of 2,4,6(trimethylbenzoyl)diphenyl phosphine oxide, 2,4,6-trimethylbenzoyl phosphonic acid ethyl ester, 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, 2-isopropylthioxanthone (2,4 isomer mixture), 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, methyl o-benzoylbenzoate, benzophenone, 4-chlorobenzophenone, 4-phenylbenzophenone, other structure modified benzophenone initiators, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzyl) butanone, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide, benzoyl formate mixture, 2-hydroxy-1-(4-(2-hydroxy-2-methylpropionylphenyl) benzyl)-2-methyl-1-propanone, bis 2,6-difluoro-3 pyrrole phenyl titanium complex, and 4-dimethylamino-benzoic acid ethyl ester; The main crosslinking agent comprises any one or a combination of 1,1-di-tert-butyl peroxy-3,3,5-trimethylcyclohexane, tert-amyl peroxy-2-ethylhexyl carbonate, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-di(tert-butyl peroxy)cyclohexane, and tert-butyl peroxy-2-ethylhexanoate; The auxiliary crosslinking agent comprises any one or a combination of triallyl isocyanurate, triallyl cyanurate, and trimethylolpropane triacrylate; The coupling agent comprises any one or a combination of vinyl trimethoxysilane, gamma-methacryloyloxypropyl trimethoxysilane, vinyl triethoxysilane, methacrylate silane, and gamma-aminopropyl triethoxysilane; The light stabilizer comprises any one or a combination of light stabilizer 622, light stabilizer 770, light stabilizer 944, light stabilizer 783, light stabilizer 123, light stabilizer 765, light stabilizer 2908, light stabilizer 531, light stabilizer 327, and light stabilizer 328. The antioxidant is one or more of aromatic amines, hindered phenols, auxiliary antioxidants, such as any one or more of a combination of beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid octadecyl ester, tris(4-nonylphenyl)phosphite and tris(2,4-di-tert-butylphenyl) phosphite.

3. The method of claim 1, wherein the method further comprises, The ultraviolet light waveband is 200nm-420nm.

4. A localized photocured photovoltaic encapsulant film curing apparatus, characterized by, The curing equipment body (1) is provided with a guide frame plate (7) fixedly installed in the curing equipment body (1), a fixed plate (3) is fixedly inserted in the middle of the guide frame plate (7), a plurality of movable movable plates (4) are equidistantly arranged on both sides of the fixed plate (3) inside the guide frame plate (7), the fixed plate (3) and the movable plate (4) and the adjacent movable plate (4) form a gap corresponding to the width of the photovoltaic panel cell, and the curing equipment body (1) is provided with an adjusting mechanism (5) for driving the movable plate (4) to move towards or away from the fixed plate (3).

5. The localized photocured photovoltaic encapsulant film curing apparatus of claim 4, wherein, The adjusting mechanism (5) comprises a fixed pin (501) fixedly arranged in the middle of the two ends of the fixed plate (3) and the movable plate (4), the outer part of the fixed pin (501) is rotatably sleeved with two hinged plates (502), the ends of adjacent hinged plates (502) are hinged to each other, the two ends of the movable plate (4) close to the curing equipment body (1) are fixedly connected with a guide rod (503) slidingly connected with the curing equipment body (1), and a gas cylinder (504) is fixedly arranged on the curing equipment body (1). The output end of the gas cylinder (504) is fixedly connected with the end of one of the guide rods (503).

6. The localized photocured photovoltaic encapsulant film curing apparatus of claim 5, wherein, The curing equipment body (1) is fixedly connected with a guide sleeve (505) sleeved outside the other guide rod (503).

7. The localized photocured photovoltaic encapsulant film curing apparatus of claim 4, wherein, The top end and the bottom end of the two ends of the movable plate (4) are rotatably embedded with a plurality of rolling balls (8), and the top wall and the bottom wall in the guide frame plate (7) are provided with guide sliding grooves (701) for guiding the rolling balls (8) to slide.

8. The localized photocured photovoltaic encapsulant film curing apparatus of claim 4, wherein, The two ends of the curing equipment body (1) are both provided with a guide roller (2) for guiding the movement of the adhesive film through a bearing plate.

9. The localized photocured photovoltaic encapsulant film curing apparatus of claim 4, wherein, The fixed plate (3) and the movable plate (4) close to the fixed plate (3) are provided with a scale assembly (6) for displaying the size of the gap, the scale assembly (6) comprises a scale plate (601) and an indicating frame (602) slidingly sleeved on the scale plate (601), the scale plate (601) is fixedly connected with the fixed pin (501) on the fixed plate (3), and the indicating frame (602) is fixedly connected with the fixed pin (501) on the movable plate (4) close to the fixed plate (3).

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