JP3454585B2 - Encapsulation materials for solar cells - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a solar cell module.
When manufacturing, suitable for joining the solar cell element and the substrate
The present invention relates to a sealing material for a solar cell used. [0002] 2. Description of the Related Art There is a need to develop new energy resources.
With the rapid close-up, alternative energy
-Solar power generation using solar cells
In recent years, they have attracted particular attention because they are permanent.
The solar cell has a function of generating an electric current when irradiated with light.
Silicon and selenium semiconductor device wafers
Connected in series or in parallel using an interconnector.
Glass, (meth) acrylic resin, polycarbonate
-Transparent protective material consisting of carbonate resin
Lower part made of stainless steel, aluminum, plastic, etc.
The package is inserted and protected between
Between the semiconductor element and the upper and lower protective materials.
Are generally joined using a sealing material. [0003] The above-mentioned sealing material is used in response to a sudden change in outside air conditions.
Damage of semiconductor elements, cracking of sealing material, interface peeling phenomenon, etc.
Having elastomeric properties to prevent generation
Is required and is used on the side receiving sunlight.
If the sunshine is high and the outdoor
Changes (deterioration) in physical properties such as a decrease in light transmittance due to standing
Is required. [0004] Conventionally, the above performance requirements have been
Heat-crosslinkable liquid silicone resin is one of the sealing materials
Although commonly used, liquid silicone resins are expensive
As well as heat-crosslinking type,
There is a problem that the process is long and is not suitable for automation. In recent years, safety adjustments for automobiles and buildings have been made.
Plasticized with a proven track record as an interlayer used for glass
Polyvinyl butyral resin sheet for solar cells
Use as a material is being considered. However, the above plasticized polyvinyl butyral
Lal resin sheets have strong self-adhesive properties, so
When storing in a state, store at low temperature or release between sheets
Blocking prevention such as storage with a release layer of paper etc. interposed
When it is necessary to take measures to prevent
Autoclave bonding under high temperature and high pressure
Must be performed, and the storage and bonding
There is a problem that. In addition, the plasticized polyvinyl
Rubutyral resin sheets do not always have sufficient water resistance.
Because it does not have it, leave it under high humidity for a long time as a sealing material
The lower the adhesive strength, the upper transparent protective material and the lower substrate.
Interfacial delamination phenomenon easily occurs between plate protection material and solar cell element
There is another problem. To cope with the above problems, various methods have been adopted.
Encapsulants are being studied, for example, solar cell elements
Small amount of ethylene copolymer containing organic peroxide
Sandwiched between at least two filler sheets and further on both sides
For laminating transparent protective material and lower substrate protective material
In this case, the surface of the protective material to be adhered and / or the filler sheet
Apply primer treatment on the surface of the
Heating to a temperature higher than the decomposition temperature of the organic peroxide
Bonding method of protective material for solar cell and filler material characterized by the following
Method (Japanese Patent Application Laid-Open No. 58-23870),
Ethylene-vinyl acetate having an amount of about 20 to 50% by weight.
A resin obtained by acid-modifying a partially saponified product of about 10 to 80% by weight of a polymer.
Solar cell module in which solar cell elements are sealed with grease
JP-A-60-137075) and the like have been proposed. However, the former organic peroxide is contained.
Using filler sheet made of ethylene copolymer
When bonding, the surface of the protective material and the surface of the filler sheet
The surface must be pre-primed,
It is cumbersome and the light resistance of the filler sheet itself is poor.
And the latter ethylene-acetic acid
The method of using the modified vinyl copolymer as a sealing material is described above.
Adhesion with the transparent protective material of the lower part and the lower substrate
As well as poor heat resistance and moisture resistance.
Excellent properties and good bonding required for encapsulant for solar cells
Encapsulants for solar cells that combine laminating and storage properties
The reality is that it has not yet been put to practical use. [0009] SUMMARY OF THE INVENTION The present invention relates to the conventional
In order to solve the problem, solar cell elements and upper and lower protection materials
Adhesion, transparency, heat resistance, moisture resistance, light resistance, etc.
Excellent properties required as a sealing material for pond
A solar cell encapsulant with laminating and storage properties
The purpose is to provide. [0010] SUMMARY OF THE INVENTION A solar cell according to the present invention is provided.
The sealing material is an ethylene-vinyl acetate copolymer and / or
Tylene- (meth) acrylate copolymer 100 weight
5 parts by weight of polyhydric alcohol or more
A conductor and a hydroxyl group of the polyhydric alcohol or a derivative thereof
1.8 to 2.8 times equivalent of benzua to aldehyde group
Condensation reaction product with aldehyde or a derivative thereof 0.0
1-4 parts by weight, and amino group, glycidyl group and mel
One or more selected from the group consisting of capto groups
Silane coupling agent having a functional group of 0.01 to 4 times
Characterized by the fact that it contains
The above object is achieved. The present invention is applied to a solar cell sealing material according to the present invention.
Ethylene-vinyl acetate copolymer (hereinafter referred to as "EVA").
To be described) is an ethylene monomer and a vinyl acetate monomer.
To a conventionally known polymerization method such as a high-pressure polymerization method and an emulsion polymerization method.
It is a copolymer obtained by further copolymerization. The vinyl acetate content in the above EVA is particularly
Although not limited, it should be 5 to 50% by weight
Is preferred. Vinyl acetate content in EVA is less than 5% by weight
If it is full, the transparency of the obtained solar cell encapsulant is poor.
In contrast, when the content exceeds 50% by weight, it is obtained.
The tensile properties of the solar cell encapsulant may decrease. The present invention is applied to a sealing material for a solar cell according to the present invention.
Ethylene- (meth) acrylate copolymer (hereinafter referred to as
Below, "E (M) A") is an ethylene monomer.
High pressure polymerization of (meth) acrylate monomer
Method, copolymerization by a conventionally known polymerization method such as an emulsion polymerization method.
It is a copolymer obtained. In addition, "(me
"T) Acrylic ester" means "acrylate ester"
Or "methacrylic acid ester". The types of the above (meth) acrylic esters and
Although there is no particular limitation,
Methyl acrylate, ethyl (meth) acrylate, (meth) a
Butyl acrylate, 2-ethylhexyl (meth) acrylate
And one or more of these are preferred.
Used for The (meth) acrylic acid in the above E (M) A
The stell content is not particularly limited, but is 5 to 5.
Preferably it is 50% by weight. (Me) in E (M) A
(T) the acrylate content is less than 5% by weight
And the transparency of the obtained solar cell encapsulant deteriorates
When the content exceeds 50% by weight, the obtained solar cell
In some cases, the tensile properties of the encapsulating material may be reduced. [0016] The EVA and E (M) A
Index (hereinafter referred to as “MI”) is particularly limited
Not subject to ASTM 1238-65T
MI measured according to 0.1-500 g / 10 min
It is preferable that, especially, 1 to 200 g / 10 minutes
More preferably, there is. The above MI of EVA and E (M) A is 0.1
g / 10 minutes, the resulting solar cell encapsulant
Poor fluidity and poor bonding processability
On the other hand, if it exceeds 500 g / 10 minutes,
The melt viscosity of the solar cell encapsulant is too low,
May spill to end. Further, the solar cell encapsulant according to the present invention
In the above, the EAV and the E (M) A are each independent.
And may be used in combination. In the sealing material for a solar cell according to the present invention,
Is based on 100 parts by weight of EVA and / or E (M) A.
And a pentavalent or higher polyhydric alcohol or a derivative thereof,
The hydroxyl group of the polyhydric alcohol or derivative thereof is
Benzaldehyde having 1.8 to 2.8 equivalents of aldehyde group
Or a condensation reaction product with a derivative thereof (hereinafter simply referred to as
0.01 to 4 parts by weight of "condensation reaction product")
Have been. It is used as a raw material for the above condensation reaction product.
Of pentavalent or higher polyhydric alcohols or their derivatives
Is not particularly limited, but sorbitol
, Xylitol, mannitol, dulcitol, sol
Bose, arabinitol, ribitol, fructose, etc.
One or two of these sugar alcohols
The above are preferably used, and among them, sorbitol and
Silitol, mannitol, dulcitol, etc.
Material for solar cell using condensation reaction product obtained from water
Is more suitable for use because it exhibits excellent transparency.
You. Further, it is used as a raw material for the above condensation reaction product.
Benzaldehyde or its derivative
Although not particularly limited,
, Hydrogen atom of benzene ring of benzaldehyde
Substituents, alkyl, aryl, alkoxy, etc.
And one or two of these.
The above is preferably used. The above-mentioned pentahydric or higher polyhydric alcohol or
Of benzaldehyde with its derivatives
The reaction method is not special, for example,
0-15489, JP-B-47-7460, etc.
Can be performed in a known manner as described in
You. The above condensation reaction method will be described more specifically.
In a reaction vessel equipped with a stirrer and a cooling pipe, for example.
Pentavalent or higher polyhydric alcohol in the presence of an active gas or
The derivative and benzaldehyde or its derivative
Sulfuric acid, p-toluenesulfonic acid, phosphoric acid, hydrochloric acid,
Add one or more condensed acid catalysts such as zinc chloride
, And the desired condensation reaction
A reaction product can be obtained. The sealing material for a solar cell according to the present invention
In the above condensation reaction product, a polyvalent
Benzual for hydroxyl group of coal or its derivatives
The ratio of aldehyde groups in the aldehyde or its derivative is 1.
It is necessary to be 8-2.8 equivalents. Pentavalent or higher polyhydric alcohol or its induction
Benzaldehyde or its attraction to hydroxyl groups of conductors
The ratio of aldehyde groups in the conductor is less than 1.8 equivalents
And a large amount of monoacetalized by-product, 2.8 times
Above the equivalent, a large amount of hemiacetalized by-product
You. Further, in the sealing material for a solar cell according to the present invention,
100 parts by weight of the EVA and / or E (M) A
On the other hand, the condensation reaction product is contained in an amount of 0.01 to 4 parts by weight.
It is necessary to be. 100 parts by weight of EVA and / or E (M) A
0.01 parts by weight of the above condensation reaction product with respect to
If it is less than 1, a sufficient transparency improving effect cannot be obtained,
Over 4 parts by weight, into EVA and / or E (M) A
Dispersibility of the solar cell deteriorates, and the resulting encapsulant for solar cells becomes transparent.
Is reduced. In the sealing material for a solar cell according to the present invention,
Is based on 100 parts by weight of the EVA and / or E (M) A.
In addition to the above condensation reaction products, amino groups, glycidyl
Or one selected from the group consisting of
Is a silane coupling agent having two or more functional groups
It is contained in an amount of 0.01 to 4 parts by weight. The above amino group, glycidyl group and mercap
One or more officials selected from the group consisting of
Functional group-containing silane coupling agent (hereinafter simply referred to as
Coupling agent)) is particularly limited
Although not required, 3-aminopropyldimethyl
Toxisilane, 3-aminopropylmethyldiethoxy
Orchid, 3-aminopropyltrimethoxysilane, 3-a
Minopropyltriethoxysilane, N- (2-amino
Tyl) -3-aminopropylmethyldimethoxysilane,
N- (2-aminoethyl) -3-aminopropyl trime
Toxysilane, 3-glycidoxypropyldimethyl eth
Xysilane, (3-glycidoxypropyl) methyldie
Toxysilane, 3-glycidoxypropyltrimethoxy
Silane, mercaptomethyldimethylethoxysilane,
(Mercaptomethyl) methyldiethoxysilane, 3-meth
Rucaptopropylmethyldimethoxysilane, 3-merca
Ptopropyltrimethoxysilane, 3-mercaptopro
Pilltriethoxysilane and the like.
Or two or more are suitably used. In the sealing material for a solar cell according to the present invention,
Is based on 100 parts by weight of the EVA and / or E (M) A.
And the silane coupling agent is contained in an amount of 0.01 to 4 parts by weight.
Need to be done. 100 parts by weight of EVA and / or E (M) A
The content of the silane coupling agent with respect to
If the amount is less than parts by weight, a sufficient adhesiveness improving effect can be obtained.
On the contrary, if it exceeds 4 parts by weight, the obtained sealing for solar cells can be obtained.
The transparency of the material decreases. In the sealing material for a solar cell according to the present invention,
Is the condensation reaction product and the silane coupling agent
Besides, if necessary as long as the object of the present invention is not hindered,
1 of various additives such as stabilizer, antioxidant, ultraviolet absorber
Species or two or more species may be contained. The type of the stabilizer is not particularly limited.
Although not something, calcium stearate soap, dia
Lucanol aliphatic tertiary amines and the like;
One or more kinds are suitably used. The type of the antioxidant is particularly
Without limitation, t-butylhydroxytol
En (BHT), trade name "Irganox 1010"
(Manufactured by Ciba-Geigy Co., Ltd.).
Or two or more are suitably used. Further, as the type of the above-mentioned ultraviolet absorber,
Is not particularly limited, but the product name "Tinuvin
p "," Tinuvin 320 "," Tinuvin 326 "," Ti
Nubin 328 "(above, manufactured by Ciba-Geigy)
Triazole UV absorber, trade name "LA-57"
(Adeka Argus) hindered amine UV
Absorbent, trade name "Seesorb 101", "Seesorb 1"
02 "," Seesorb 103 "," Seesorb 104 "
Benzophenone-based ultraviolet rays such as (produced by Cipro Kasei)
Absorbents and the like, and one or more of these
It is preferably used. Method for producing solar cell encapsulant according to the present invention
Is not particularly limited, for example,
Should go to First, a predetermined amount of EVA and / or E (M)
A, condensation reaction product, silane coupling agent and necessary
Uniformly mix various additives to be included according to the resin composition
Make things. The mixing method is particularly limited.
Although not something, for example, using a kneader such as a roll mill
Melt kneading with EVA and / or E (M) A
Dry blending method, in which other components are mixed as is,
Contains components other than EVA and / or E (M) A in high concentration
Pellet of master batch of EVA and / or E (M) A
The EVA and / or EVA are prepared in advance.
(M) Resin set diluted with A pellet and having prescribed composition
High-concentration masterbatch method to obtain a product
These are also preferably used. Next, the uniform resin composition obtained above
Is not particularly limited, for example, extruded
Sheeting using a press method, a press method, a calendar method, etc.
And the desired sheet-shaped solar cell sealing material (hereinafter simply referred to as
(Referred to as "sealing material sheet"). Using the sealing material for a solar cell according to the present invention,
The method of manufacturing the solar cell module is not particularly limited.
However, for example, the following may be performed. The solar cell element is made of silicon or selenium.
In the case of a body wafer, these
Sandwiched between two sealing material sheets, protective material on both sides, immediately
The top transparent protective material and the lower substrate protective material
Bond by heating under air. At this time, the solar cell
The element is sandwiched between at least two sealing material sheets, and
Laminated, protect upper transparent material and lower substrate
The material and the material may be bonded by heating under vacuum. The heating temperature during the above-mentioned heat bonding is not particularly limited.
Although it is not a thing, it should be about 90-110 ° C
Preferably, this heat treatment allows the encapsulant sheet and the upper
It is firmly adhered to the transparent protective material and the lower substrate protective material.
The solar cell element is laminated with two sheets of sealing material,
And it is strong to upper transparent protective material and lower substrate protective material
To obtain the desired solar cell module bonded to
Can be done. Further, when the solar cell element is made of glass or plastic,
Formed on a protective material such as metal, ceramic, stainless steel, etc.
If the sealing material sheet is used as an intermediate layer,
Sealing material is placed on the solar cell element formed on the protective material
Sheet and upper transparent protective material are sequentially stacked
Or the thick transparent protective material
A sealing material sheet and a lower substrate protection material are placed under the solar cell element.
Each is superimposed one after another, and this is evacuated as described above.
By bonding by heating and bonding under the solar cell
One protective material on which the element is formed, a sealing material sheet and
A desired solar cell module on which the other protective material is firmly attached
Joules can be obtained. [0043] The solar cell encapsulant according to the present invention comprises ethylene-
Vinyl acetate copolymer and / or ethylene- (meth) ac
Mainly composed of acrylate copolymer, pentavalent or more polyvalent
Alcohol or its derivatives and benzaldehyde
Or the product of condensation reaction with its derivatives
And excellent in transparency, heat resistance, moisture resistance, light resistance, and the like. Also, amino groups, glycidyl groups and mercap
One or more officials selected from the group consisting of
Contains silane coupling agents with functional groups
The solar cell semiconductor element, upper transparent protective material and lower substrate
Excellent adhesion to plate protection materials even at relatively low heating temperatures
Demonstrate. [0045] EXAMPLES In order to explain the present invention in more detail, the following will be described.
Examples will be given. In the examples, "parts" means "parts by weight".
means. (Example 1) (1) Synthesis of condensation reaction products D-sol was placed in a 3 l flask equipped with a stirrer and a reflux condenser.
182 g (1.0 mol) of bitol, benzaldehyde 2
12 g (2.0 mol), toluene 800 ml, and concentrated sulfur
2.0 ml of acid was added and a condensation reaction was carried out at 80 ° C. for 3 hours.
Was. Then, toluene was distilled off and neutralized with potassium hydroxide.
After washing, filtering and drying with hot water,
347 g of the combined reaction product dibenzylidene sorbitol (yield
97.0 mol%). (2) Preparation of resin composition As shown in Table 1, ethylene-vinyl acetate copolymer (trademark)
Product name "Ultracene 751", vinyl acetate content 28 layers
%, MI 6 g / 10 min, manufactured by Tosoh Corporation)
And the dibenzylide obtained above as a condensation reaction product
0.3% sorbitol and silane coupling agent
N- (2-aminoethyl) -3-aminopropylmethyl
Combine 0.05 parts of rudimethoxysilane and roll mill
The mixture was melt-kneaded to obtain a uniform resin composition. (3) Sealant sheet and solar cell module
Production The resin composition obtained above is placed between two PET films.
And press to produce a 400μ thick encapsulant sheet
did. Next, a duplication is made between the two obtained sealing material sheets.
Several silicon semiconductor wafers for solar cells
Are arranged in series using a
Lath and a polyvinyl fluoride resin sheet on the underside
(Trade name "Tedlar Film", manufactured by Dupont)
Laminated each other, using a vacuum laminator, heating temperature 1
Heat adhered at 00 ° C at a reduced pressure of 10 mmHg for 20 minutes.
A solar cell module was manufactured. (4) Evaluation Of the sealing material sheet and the solar cell module obtained above.
Various characteristics were evaluated by the following methods. The results are shown in Table 2.
It was as expected. [0051]transparency: JIS K-6714 "Aircraft
Methacrylic resin plate "and the product name" Integral turbidity
23 ° C.-50% RH using “Tokyo Denki”
Light transmittance (%) and haze of solar cell module in
(Haze value) was measured. The measurement was performed at n = 10.
Was calculated. [0052]Adhesive strength: Sealing material sheet obtained above
With flat glass and polyvinyl fluoride resin sheet
When the solar cell module is manufactured
Heat and bond under the same conditions as in
Produced. Next, it is cut into 2cm width and 10cm length
The above sample was used for the trade name “Tensilon UCE500” (E
Using a tensile speed of 500 mm /
In minutes, encapsulant sheet and flat glass and polyfluoride
90 degree angle peel strength with vinyl resin sheet (kg / cm)
Was measured. [0053]Temperature and humidity cycle resistance: JIS C-89
17 Solar cell module evaluation method
After leaving at -20 ° C for 6 hours,
It takes 1 hour to reach 5 ° C and rises to + 85 ° C-85% RH
After leaving for 6 hours in an atmosphere of + 85 ° C to -20 ° C
It takes one hour to cool down as one cycle,
Visual observation of solar cell module after 10 cycles
And the presence or absence of abnormalities such as discoloration and peeling was determined. [0054]Lightfastness: Conforms to JIS C-8917
And solar cell module with sunshine carbon arc
Put in a light type light fastness tester and release at 63 ° C for 500 hours
After visually observing the appearance of the solar cell module after
The presence or absence of abnormalities such as discoloration and peeling was determined. (Example 2) In the synthesis of the condensation reaction product, the D-sol
In place of bitol, 152 g of xylitol (1.0 m
The condensation reaction was carried out in the same manner as in Example 1 except that
320 g of the reaction product dibenzylidene xylitol (yield 9
5.0 mol%). In preparing the resin composition, as shown in Table 1,
Sea urchin ethylene-vinyl acetate copolymer (trade name "EVA
-X505 ", vinyl acetate content 28% by weight, MI 6 g
/ 10 minutes, manufactured by Mitsubishi Chemical Corporation)
Dibenzylidene xylitol obtained above as a product
0.5 part and N- (2-A) as a silane coupling agent
Minoethyl) -3-aminopropylmethyldimethoxy
Same as Example 1 except that 0.2 part of run was blended.
Thus, a sealing material sheet and a solar cell module were produced. (Embodiment 3) In the synthesis of the condensation reaction product, the D-sol
182 g of D-mannitol (1.
0 mol) in the same manner as in Example 1, except that
320 g of the combined reaction product dibenzylidene mannitol (yield
75.0 mol%). In preparing the resin composition, as shown in Table 1,
Sea urchin ethylene-vinyl acetate copolymer (trade name "EVA
FLEX 360 ", vinyl acetate content 25% by weight, MI
2 g / 10 min, manufactured by Mitsui DuPont)
Dibenzylideneman obtained above as a combined reaction product
0.03 parts of nititol and 3 as a silane coupling agent
-Contains 2 parts of mercaptopropyltriethoxysilane
In the same manner as in Example 1 except that
A solar cell module was manufactured. (Example 4) In preparing the resin composition, as shown in Table 1,
Sea urchin ethylene-methyl methacrylate copolymer (trade name
"Aclift WH202", methyl methacrylate content
20% by weight, MI 3 g / 10 min, manufactured by Sumitomo Chemical Co., Ltd.)
To 100 parts, as a condensation reaction product, synthesized in Example 1.
0.3 parts of dibenzylidene sorbitol and
3-aminopropyltrimethoxysila as a coupling agent
In the same manner as in Example 1 except that 0.2 part
Thus, a sealing material sheet and a solar cell module were produced. (Embodiment 5) In preparing the resin composition, as shown in Table 1,
Sea urchin ethylene-methyl methacrylate copolymer (trade name
"Aclift WK402", methyl methacrylate content
25% by weight, MI 7 g / 10 min, manufactured by Sumitomo Chemical Co., Ltd.)
To 100 parts, as a condensation reaction product, synthesized in Example 1.
1.5 parts of dibenzylidene sorbitol and
3-glycidoxypropyl trimethoxy as a coupling agent
Same as Example 1 except that 1 part of silane was blended.
Thus, a sealing material sheet and a solar cell module were produced. (Comparative Example 1) In preparing the resin composition, as shown in Table 1,
As described above, N- (2-amino) is used as a silane coupling agent.
Ethyl) -3-aminopropylmethyldimethoxysilane
Replaced with 0.5 parts of vinyltrimethoxysilane
In the same manner as in Example 1 except that
And a solar cell module were fabricated. (Comparative Example 2) In preparing the resin composition, as shown in Table 1,
Thus, the distribution of the condensation reaction product dibenzylidene xylitol
Same as Example 2 except that the total amount was 0.005 parts.
To produce a sealing material sheet and a solar cell module.
Was. (Comparative Example 3) In the preparation of the resin composition, as shown in Table 1,
Thus, the distribution of the condensation reaction product dibenzylidene sorbitol
Sealing was performed in the same manner as in Example 4 except that the total amount was 5 parts.
A stopper sheet and a solar cell module were produced. (Comparative Example 4) The ethylene-vinyl acetate copolymer “EVAF”
LEX360 ”with 100 parts of triallyl isocyanate
Rate (product name "Taiku", manufactured by Nippon Kasei Co., Ltd.), 3 copies, organic
1,1-bis (t-butylperoxy) as peroxide
-3,3,5-trimethylcyclohexane (trade name “PA
-Hexa 3M ", 1 part by NOF Corporation and silane cup
Γ-methacryloxypropyl trimethoxy as a ring agent
Example using a resin composition containing 0.3 part of silane
In the same manner as in Example 1, a sealing material sheet was produced. Then get
The heating temperature was set to 130 ° C using the sealed sealing material sheet.
Except that the solar cell module was manufactured in the same manner as in Example 1.
Produced. (Comparative Example 5) Ethylene-vinyl acetate copolymer (trade name)
"Ultracene 750", vinyl acetate content 32 weight
%, Manufactured by Tosoh Corporation) and hydrolyzed into E having a saponification degree of 90% by weight.
A partially saponified product of VA was obtained. The obtained partially saponified EVA 18
0 g, phthalic anhydride 104 g and pyridine 40 ml
Mix in 1.5 l of xylene and react at 110 ° C for 4 hours
Was carried out to obtain an EVA partially esterified product. E obtained
The composition of the VA partially esterified product was determined by infrared analysis and chemical analysis.
As a result of the analysis, 68.0% by weight of ethylene component,
3.2% by weight of vinyl acetate component, 1 of vinyl alcohol component
6.1% by weight and 12.7% by weight of vinyl phthalate component
there were. The EVA partially esterified product obtained above was
The sealing material sheet and the solar cell were used in the same manner as in Example 1.
A pond module was made. [0076] Obtained in Examples 2 to 5 and Comparative Examples 1 to 5
Various characteristics of sealing material sheet and solar cell module
The results evaluated in the same manner as in Example 1 are as shown in Table 2.
Was. [0077] [Table 1][0078] [Table 2][0079] As described above, the solar cell according to the present invention
Pond sealing material has excellent transparency, adhesion, heat resistance, and moisture resistance
And light resistance, as well as bonding workability and storage
Also good for solar cell module production
Can be. Further, the solar cell sealing material according to the present invention is used.
The solar cell module manufactured in this way is transparent, adhesive,
High quality with excellent heat resistance, moisture resistance, light resistance, etc.
You.

Continuation of the front page (56) References JP-A-6-299125 (JP, A) JP-A-6-177412 (JP, A) JP-A-59-4179 (JP, A) JP-A-58-23870 (JP) JP-A-60-137075 (JP, A) JP-A-47-29434 (JP, A) JP-A-48-8860 (JP, A) JP-A-48-44332 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) H01L 31/04-31/06 C08L 23/00-101/16 C09J 4/00-201/10

Claims (1)

(57) [Claims] 1. An ethylene-vinyl acetate copolymer and / or an ethylene- (meth) acrylate copolymer 10
Condensation reaction of a pentavalent or higher polyhydric alcohol or a derivative thereof with benzaldehyde or a derivative thereof in which the aldehyde group is 1.8 to 2.8 times equivalent to the hydroxyl group of the polyhydric alcohol or the derivative thereof with respect to 0 parts by weight. 0.01 to 4 parts by weight of the product and one or two selected from the group consisting of an amino group, a glycidyl group and a mercapto group
Silane coupling agent having at least one kind of functional group 0.01
1 to 4 parts by weight of a sealing material for a solar cell.