Coating composition for solar cell protective covers

A solar cell and composition technology, applied in polyurea/polyurethane coatings, coatings, circuits, etc., can solve the problems of insufficient improvement in solvent resistance, weather resistance, durability, and insufficient curing

Inactive Publication Date: 2008-12-03
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, although these fluororesins are soluble in common solvents, even for the curable fluorine-containing copolymers in Japanese Patent Publication No. 8-32847, the total amount of hydroxyl value and acid value introduced is also 30 mgKOH/ Within g, and in the examples, the copolymer whose solubility in mineral oil was confirmed has a hydroxyl value and an acid value as low as 5 mgKOH/g, and its curability is not sufficient, so it cannot be expected to be an advantageous feature as a fluororesin. Solvent resistance, weather resistance, durability, etc. have been improved
[0013] On the other hand, in the field of solar cells, Japanese

Method used

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  • Coating composition for solar cell protective covers
  • Coating composition for solar cell protective covers
  • Coating composition for solar cell protective covers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0125] (II) Transparent resin:

[0126] polycarbonate

[0127] (III) Outer coating:

[0128] Cured product of the following curable fluorine-containing coating composition

[0129] (A) Curable fluororesin:

[0130] Curable fluororesin of the above (A1) (particularly TFE / vinyl ester / monomer containing a curing site (hydroxyl or carboxyl group) copolymer)

[0131] (B) curing agent:

[0132] Isocyanate

[0133] (C) Solvent:

[0134] The third organic solvent (especially coal tar essence)

[0135] (D) Additives:

[0136] Hydrophilic agent, UV absorber, silane coupling agent

[0137] (IV) Primer coat:

[0138] none

Embodiment approach 2

[0140] (II) Transparent resin: polyethylene terephthalate

[0141] (III) Outer coating:

[0142] Cured product of the following curable fluorine-containing coating composition

[0143] (A) Curable fluororesin:

[0144] Curable fluororesin of the above (A1) (particularly CTFE / vinyl ether / monomer containing curing site (hydroxyl or carboxyl group) copolymer)

[0145] (B) curing agent:

[0146] Isocyanate

[0147] (C) Solvent:

[0148] The third organic solvent (especially mineral essential oil)

[0149] (D) Additives:

[0150] Silane coupling agent, UV absorber

[0151] (IV) Primer coat:

[0152] none

Embodiment approach 3

[0154] (II) Transparent resin:

[0155] Acrylic

[0156] (III) Outer coating:

[0157] Cured product of the following curable fluorine-containing coating composition

[0158] (A) Curable fluororesin:

[0159] Curable fluororesin of the above (A1) (particularly a mixture of a copolymer of TFE / vinyl ester / monomer containing a curing site (hydroxyl or carboxyl group) and a curable acrylic resin)

[0160] (B) curing agent:

[0161] Isocyanate

[0162] (C) Solvent:

[0163] The third organic solvent (especially coal tar essence)

[0164] (D) Additives:

[0165] UV absorber

[0166] (IV) Primer coat:

[0167] none

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PUM

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Abstract

The invention provides a solar cell protective cover which is not impaired in the transparency satisfactory for the protective cover for solar cells and has excellent room-temperature workability, solvent resistance, weather resistance and endurance; and a curable fluororesin coating composition capable of forming the cover. A curable fluororesin coating composition for solar cell protective covers comprising (A) a curable fluororesin, (B) a curing agent, and (C) a solvent, which is to be applied either directly to a transparent resin layer (II) formed on the side of a solar cell module (I) to be irradiated with sun rays or to a primer layer (IV) previously formed on the layer (II) and thus form a top coat layer (III) made of a cured fluororesin.

Description

technical field [0001] The present invention relates to a protective cover of a solar cell and a curable fluorine-containing coating composition for forming the protective cover. The protective cover of the solar cell has transparency, solvent resistance, water resistance (moisture permeability resistance), weather resistance Excellent durability, durability, film hardness, gloss, and environmental protection. Background technique [0002] Today, glass panels are used to protect solar cells. However, glass is heavy and brittle, and therefore light, transparent, and high-refractive polycarbonate plates or transparent resin plates such as acrylic resin plates have been proposed as substrates instead of glass plates. However, these transparent resins are poor in weather resistance, chemical resistance, scratch resistance, stain resistance, etc., so they have not replaced glass plates so far. [0003] In addition, fluororesins have excellent weather resistance, low refractive ...

Claims

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Application Information

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IPC IPC(8): H01L31/0216H01L31/18H01L31/04H01L31/042B32B27/30B32B27/36C08G18/62C09D161/20C09D175/04C09D201/04H01L31/048
CPCY02E10/50
Inventor 长门大前田昌彦加藤雅巳樋口达也向井惠吏东浦忠司
Owner DAIKIN IND LTD
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