KR101212449B1 - Resin coating composition for solar cell module back sheet, solar cell module back sheet, solar cell comprising the same, and fabrication method thereof - Google Patents

Abstract

The present invention relates to a solar cell module comprising a resin coating composition for a solar cell module back sheet containing a resin and a plate particle, a substrate and a resin coating layer containing a plate particle or a layered silicate compound coated on both or one side of the substrate. It provides a back sheet, a solar cell module including the back sheet and a method of manufacturing the same.

Description

RESIN COATING COMPOSITION FOR SOLAR CELL MODULE BACK SHEET, SOLAR CELL MODULE BACK SHEET, SOLAR CELL COMPRISING THE SAME, AND FABRICATION METHOD THEREOF}

The present invention relates to a resin coating composition for a solar cell module back sheet, and more particularly, a back sheet resin coating composition for a solar cell module having excellent insulation and hygroscopicity, a solar cell module back sheet, a solar cell module including the same, and a It relates to a manufacturing method.

The solar cell module consists of low iron tempered glass, filler (EVA), solar cell (Cell), back sheet, and metal wire that electrically connects each cell. It is a constituent material of the solar cell module which has moisture proof function and insulation blocking function to prevent moisture penetrating from the rear.

As the main performance and structure of the backsheet, it must have long term durability (weather resistance) for 25 years or more, the water vapor penetration prevention effect (hygroscopicity) should be 1.6g / m ² (24hr) or less, and the adhesive strength with the adhesive layer and the substrate should be high.

Therefore, the type of laminating the PVF (Polyvinyl Fluoride: TEDLAR) sheet with excellent weather resistance is currently used, but the PET composite structure such as aluminum laminating (or deposition) on PET film for cost reduction due to high cost The type of products are being developed and commercialized mainly by Japanese companies, but the most important hygroscopicity is reduced, resulting in a thicker thickness, which makes it difficult to take the thickness of the backsheet and the solar cell itself, and the insulation is also poor.

The present invention has been made to solve the problems of the prior art as described above, the object is a resin coating composition for a solar cell module back sheet excellent in insulation and hygroscopicity, a solar cell back sheet, a solar cell comprising the same To provide a manufacturing method.

The technical problem of the present invention as described above is achieved by the following means.

(1) Resin coating composition for solar cell module backsheet containing resin, plate particle, or layered silicate compound.

(2) The method according to claim 1,

Plate-like particles are resin coating composition for solar cell module back sheet, characterized in that the plate-shaped alumina or plate-like hydrotalcite.

(3) The method according to claim 1,

Layered silicate compounds include montmorillonite, nontronite, beidelite, hectorite, saponite, illite, celadonite, writing Resin coating composition for a solar cell module backsheet, characterized in that the loconite (gluconite), clay (clay) and bentonite (bentonite).

(4) The method according to 1,

A resin coating composition for a solar cell module back sheet, further comprising at least one selected from the group consisting of silica, titanium oxide, zinc oxide, barium sulfate, ytterbium oxide, and ytterbium fluoride.

(5) substrates; And

Resin coating layer containing plate-like particles or layered silicate compound coated on both or one side of the substrate

Back sheet for a solar cell module comprising a.

(6) the method of paragraph 5,

The substrate is a polyester terephthalate (PET) film, characterized in that the solar cell module back sheet.

(7) The method of paragraph 5,

The plate particle is a solar cell module back sheet, characterized in that the plate-shaped alumina or plate-like hydrotalcite.

(8) the method of paragraph 5,

The plate-shaped particle is a back sheet for a solar cell module, characterized in that the aspect ratio of the axis short axis (5 ~ 300).

(9) The method of claim 5,

The plate-shaped particle is a back sheet for a solar cell module, characterized in that the major axis is 0.2 ~ 30㎛, the minor axis is 0.01 ~ 5㎛.

(10) The method according to 5,

The surface roughness of the resin coating layer is a back sheet for a solar cell module, characterized in that 0.3 ~ 5.0㎛.

(11) The method according to 5,

The solar cell module back sheet, characterized in that the primer layer is further formed on the upper surface of the resin coating layer.

(12) The method according to 5,

Plate-like particles or layered silicate compound is a solar cell module back sheet, characterized in that contained 1 to 50% by weight based on the weight of the resin.

(13) A solar cell module comprising the backsheet of any one of claims 5-12.

(14) preparing a substrate; And

A method of manufacturing a back sheet for a solar cell module comprising coating a resin containing a plate-like particle or a layered silicate compound on both surfaces or one surface of the substrate.

(15) The method according to claim 14,

The plate-like particle is a manufacturing method of a solar cell module back sheet, characterized in that the plate-shaped alumina or plate-like hydrotalcite.

According to the present invention can provide a solar cell module back sheet excellent in both insulation and hygroscopicity and a solar cell module comprising the same.

1 is a block diagram of a solar cell module back sheet according to the present invention.
1 is an electron micrograph of the plate-shaped alumina used in the present invention.
2 is an electron micrograph of the spherical titanium oxide used in the present invention.

Hereinafter, the content of the present invention will be described in detail.

The present invention provides a resin coating composition for a solar cell module backsheet containing a resin and a plate-like particle or layered silicate compound.

The resin used in the resin coating composition is not limited to a special kind, and for example, a fluorine resin, a polyester resin, or the like may be used.

As the plate-shaped particles used in the resin coating composition, plate-like inorganic particles, for example, plate-like alumina or plate-like hydrotalcite may be used.

The layered silicate compound used in the resin coating composition is preferably an inorganic particle that is an interlayer compound, for example, montmorillonite, nontronite, beidelite, hectorite, Saponite, illite, celadonite, gluconite, clay and bentonite may be used.

In order to improve hygroscopicity, the content of the plate-like particles, preferably plate-like alumina or plate-hydrotalcite, or layered silicate compound is preferably contained in an amount of 1% by weight or more based on the resin content, more preferably 10% by weight or more. It is good to contain 10-50 weight% more preferably. If it is 1 wt% or less with respect to the resin content, it is difficult to secure hygroscopicity and insulation, and if it is 50 wt% or more, the coating property is poor, and it is difficult to secure adhesion of the substrate.

Preferably the size of the plate-shaped particles is 0.2 ~ 30 ㎛ long axis, 0.01 ~ 5 ㎛ short axis, the aspect ratio of long axis short axis is 5 ~ 300, preferably 10 or more, more preferably It is good to select from 30 or more. If the ratio of the short axis length is less than 5, there is a limit in improving hygroscopicity because the interlaminar structure of the plate-shaped particles is not achieved. If the ratio of the long axis length ratio is 300 or more, the particle size is tens of microns.

On the other hand, the upper surface of the resin coating layer is preferably formed to form a surface roughness of 0.3 ~ 5.0 ㎛ of the coating layer in order to give an adhesive force with the adhesive layer (for example EVA film), if the surface roughness is not given a primer (Primer) treatment It can also give an adhesive force. When the surface roughness is 0.3 μm or less, the adhesive force with the upper film may be degraded, and when the surface roughness is 5 μm or more, the adhesive force with the upper film may be degraded, and an air layer may be formed to reduce the hygroscopicity.

The resin coating layer may include silica, titanium oxide, zinc oxide, and sulfuric acid for the purpose of UV barrier property (including weather resistance improvement), surface roughness adjustment, suppression of bubbles or wrinkles on the coating film, whiteness improvement, etc. in addition to the plate-shaped particles or the layered silicate compound. Particles such as barium, ytterbium oxide, and ytterbium fluoride can be mixed and used, and fine particles such as iron oxide (Red), cobalt aluminate (Blue), and cobalt manganese aluminate (Greem) can also be used for color realization. have.

In addition, in the case of the plate-like particles or the layered silicate compound, a silane coupling agent may be used to improve the miscibility with the fluororesin, and the functional groups of the silane used may be vinyl, epoxy, styryl, Methacrylicoxy type, acryloxy type, amino type, ureide type (Ureid), chloropropyl type, mercapto type, polysulfide type, isocyanate type etc. can be used. At this time, the surface treatment amount of the silane coupling agent may be determined according to the following formula.

Silane Content (g) = (Amount of Filler (g) x Filler Surface Area (m2 / g) / (Minimum Coating Area of Silane Coupling Agent (ws))

In addition, the present invention includes a solar cell backsheet as shown in Figure 1, wherein the backsheet is a substrate (10); And a resin coating layer 20 containing plate-like particles or layered silicate compounds coated on both or one side of the substrate.

The substrate constituting the solar cell backsheet according to the present invention is not particularly limited, and a polyester-based film, preferably a polyester terephthalate (PET) film, may be used.

The resin coating layer containing the plate-like particles or the layered silicate compound may be formed by coating a composition including a resin and the plate-like particles or the layered silicate compound in a constant ratio on both sides or one side of the base film, wherein the coating is a doctor blade. Or it is preferable to adjust the coating thickness to 5 ~ 50㎛, more preferably 20 ~ 30㎛ using a coating equipment such as slot die, comma.

After coating the resin coating composition on the substrate as described above may further comprise a step of drying at a temperature of 60 ~ 300 ℃ preferably 250 ℃ 10 minutes or more.

The solar cell backsheet according to the present invention has an adhesive layer / primer layer / resin coating layer / base coating layer / resin coating layer / primer layer / adhesive layer as a basic structure, and in this case, the adhesive layer may be omitted when vacuum bonding. As mentioned above, the resin coating layer and the adhesive layer may be formed only on the upper portion of the base film, and may be omitted below.

It is preferable that the backsheet according to the present invention prepared as described above has a water vapor transmission (WVTR) of 1 g / m ² d or less, more preferably 0.3 g / m ² d or less, and even better. Is preferably 0.1 g / m ² d or less. In general, the moisture absorption rate of the film was 2.3 g / m ² d when the PET, PVF (Tadlar) / PET / PVF For (Tadlar) and ^{3.0 g / m 2 d, 27} ~ 33 g / m 2 d when the EVA It has hygroscopicity.

In addition, the present invention provides a solar cell comprising the solar cell back sheet.

The solar cell according to the present invention fills a gap with a filler composed of a thermoplastic (ethylene-vinylacetate copolymer) around the solar cells arranged in series or in parallel, and a glass surface is disposed on the side where the solar light collides. It may have a configuration to protect the solar cell back sheet according to the invention.

The solar cell may be manufactured by a method known in the art, except for including the solar cell backsheet according to the present invention, and thus the solar cell is very excellent in insulation and hygroscopicity.

Hereinafter, the contents of the present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to these examples.

Example 1

404 g of Lumifron LF-200 (Asahi Glass, Solvent soluble Fluoropolymer, 60 wt% solids), plate-shaped alumina (FIG. 1, SG-FALO2000, SukgyungAT), and xylene 334 g were mixed with a fluorine resin using a planetary mixer (NETESCH). It was.

The mixed slurry was milled using a three-roll mill (EXAKT), uniformly mixed, filtered with a 20 μm micro filter, and then the recovery was calculated. (Recovery rate = [recovery amount after first-variance filtering / first-dispersion input amount] × 100) (ex) recovery rate% = [A / 1264] × 100)

566 g of fluorine-based resin LF-200 and 170 g of xylene were mixed with a primary milling fraction recovery rate of 100% to make the total amount 2,000 g. At this time, the ratio of the inorganic particles and the binder was 0.90, and the total solid content was 55.4% by weight.

The coating composition was coated on a base layer (PET Film, 188㎛) using a comma coater in a wet coating thickness of 40-50㎛, and then dried at 120 ° C. for 30 minutes by primary drying, followed by main drying It dried at 200 degreeC for 10 minutes. The coating was applied in the same manner as the opposite shaving of the coated substrate layer.

Table 1 shows the results of confirming the hygroscopicity of the prepared backsheet (plate-like alumina-containing fluorine resin layer / PET / plate-like alumina-containing fluorine resin layer).

[Example 2]

As a fluorine-based resin, 404 g of Lumifron LF-200 (Asahi Glass, Solvent soluble Fluoropolymer, 60 wt% solids), 526 g of plate hydrotalcite (SG-HT200F, SukgyungAT), and 334 g of xylene were mixed using a planetary mixer (NETESCH). .

The mixed slurry was milled using a three-roll mill (EXAKT), uniformly mixed, filtered with a 20 μm micro filter, and then the recovery was calculated. (Recovery rate = [recovery amount after first-variance filtering / first-dispersion input amount] × 100) (ex) recovery rate% = [A / 1264] × 100)

566 g of fluorine-based resin LF-200 and 170 g of xylene were mixed with a primary milling fraction recovery rate of 100% to make the total amount 2,000 g. At this time, the ratio of the inorganic particles and the binder was 0.90, and the total solid content was 55.4% by weight.

The coating composition was coated on a substrate layer (PET Film, 188㎛) using a comma coater in a wet coating thickness of 40-50㎛, and then dried at 120 ° C. for 30 minutes by primary drying, followed by 200 It dried at 10 degreeC. The coating was applied in the same manner as the opposite shaving of the coated substrate layer.

Table 1 shows the results of confirming the hygroscopicity of the prepared backsheet (plate hydrotalcite-containing fluorine resin layer / PET / plate hydrotalcite-containing fluorine resin layer).

[Example 3]

Lumifron LF-200 (Asahi Glass, Solvent soluble Fluoropolymer, solid content 60% by weight) 404g, fluorine-based alumina (SG-FALO2000, SukgyungAT) 315.6g, spherical titania (Fig. 2, SG-TO200, SukgyungAT) 210.4g, Xylene 334 g was mixed using a planetary mixer (NETESCH).

The mixed slurry was milled using a three-roll mill (EXAKT), uniformly mixed, filtered with a 20 μm micro filter, and then the recovery was calculated. (Recovery rate = [recovery amount after first-variance filtering / first-dispersion input amount] × 100) (ex) recovery rate% = [A / 1264] × 100)

566 g of fluorine-based resin LF-200 and 170 g of xylene were mixed with a primary milling fraction recovery rate of 100% to make the total amount 2,000 g. At this time, the ratio of the inorganic particles and the binder was 0.90, and the total solid content was 55.4% by weight.

The coating composition was coated on a substrate layer (PET Film, 188㎛) using a comma coater in a wet coating thickness of 40-50㎛, and then dried at 120 ° C. for 30 minutes by primary drying, followed by 200 It dried at 10 degreeC. The coating was applied in the same manner as the opposite shaving of the coated substrate layer.

Table 1 shows the results of confirming the hygroscopicity of the prepared backsheet (plate-like alumina and spherical titania-containing fluorine resin layer / PET / plate-like alumina and spherical titania-containing fluorine resin layer).

Example 4

Lumifron LF-200 (Asahi Glass, Solvent soluble Fluoropolymer, Solid content 60% by weight) 404g, Fluorinated Resin (SG-HT200F, SukgyungAT) 315.6g, Old Titania (SG-TO200, SukgyungAT) 210.4g, Xylene 334g Was mixed using a planetary mixer (NETESCH).

The mixed slurry was milled using a three-roll mill (EXAKT), uniformly mixed, filtered with a 20 μm micro filter, and then the recovery was calculated. (Recovery rate = [recovery amount after first-variance filtering / first-dispersion input amount] × 100) (ex) recovery rate% = [A / 1264] × 100)

566 g of fluorine-based resin LF-200 and 170 g of xylene were mixed with a primary milling fraction recovery rate of 100% to make the total amount 2,000 g. At this time, the ratio of the inorganic particles and the binder was 0.90, and the total solid content was 55.4% by weight.

The coating composition was coated on a substrate layer (PET Film, 188㎛) using a comma coater in a wet coating thickness of 40-50㎛, and then dried at 120 ° C. for 30 minutes by primary drying, followed by 200 It dried at 10 degreeC. The coating was applied in the same manner as the opposite shaving of the coated substrate layer.

Table 1 shows the results of confirming the hygroscopicity of the prepared backsheet (plate hydrotalcite and spherical titania-containing fluorine resin layer / PET / plate hydrotalcite and spherical titania-containing fluorine resin layer).

Comparative Example 1

After mixing 800g of fluorine-based resin LF-200 and 200g of xylene, the coating composition was coated with a comma coater on a base layer (PET Film, 188㎛) in a wet state with a coating thickness of 40-50㎛, followed by primary drying. It dried at 120 degreeC for 30 minutes, and dried at 200 degreeC for 10 minutes by this drying. The coating was applied in the same manner as the opposite shaving of the coated substrate layer.

Table 1 shows the results of confirming the hygroscopicity of the prepared backsheet (fluorine resin layer / PET / fluorine resin layer).

Comparative Example 2

In Example 1, the film was manufactured by the same method except having used fused alumina of 1-3 micrometers instead of plate-shaped alumina.

Table 1 shows the results of confirming the hygroscopicity of the prepared backsheet (molten alumina-containing fluorine resin layer / PET / molten alumina-containing fluorine resin layer).

Sheet structure Thickness (㎛) WVTR (g / m2d) Example 1 Plate-shaped alumina-containing fluorine resin layer 25 0.6 PET 188 Plate-shaped alumina-containing fluorine resin layer 25 Example 2 Plate-like hydrotalcite-containing fluororesin layer 25 0.7 PET 188 Plate-like hydrotalcite-containing fluororesin layer 25 Example 3 Plate-shaped alumina and spherical titania-containing fluororesin layer 25 0.9 PET 188 Plate-shaped alumina and spherical titania-containing fluororesin layer 25 Example 4 Plate-like hydrotalcite and spherical titania-containing fluororesin layer 25 0.9 PET 188 Plate-like hydrotalcite and spherical titania-containing fluororesin layer 25 Comparative Example 1 Fluorine Resin Layer 25 3.4 PET 188 Fluorine Resin Layer 25 Comparative Example 2 Molten Alumina-Containing Fluorine Resin Layer 25 2.8 PET 188 Molten Alumina-Containing Fluorine Resin Layer 25

The water vapor transmission rate (WVTR) characteristics were measured under conditions having a uniform thickness with a sample size of 10 cm × 10 cm using an Illinois Instrument 7002 water vapor transmission analyzer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that

Claims (15)

delete delete delete delete materials; And
Resin coating layer containing plate-like particles or layered silicate compound coated on both or one side of the substrate, the surface roughness of 0.3 ~ 5.0㎛
Back sheet for a solar cell module comprising a. 6. The method of claim 5,
The substrate is a polyester terephthalate (PET) film, characterized in that the solar cell module back sheet. 6. The method of claim 5,
The plate particle is a solar cell module back sheet, characterized in that the plate-shaped alumina or plate-like hydrotalcite. 6. The method of claim 5,
The plate-shaped particle is a back sheet for a solar cell module, characterized in that the aspect ratio of the axis short axis (5 ~ 300). 6. The method of claim 5,
The plate-shaped particle is a back sheet for a solar cell module, characterized in that the major axis is 0.2 ~ 30㎛, the minor axis is 0.01 ~ 5㎛. delete 6. The method of claim 5,
The solar cell module back sheet, characterized in that the primer layer is further formed on the upper surface of the resin coating layer. 6. The method of claim 5,
Plate-like particles or layered silicate compound is a solar cell module back sheet, characterized in that contained 1 to 50% by weight based on the weight of the resin. A solar cell module comprising the backsheet of claim 5.
delete delete

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