JP2004183331A - Heat insulating structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating structure which is not inflated with time, free from separation, etc., and ensures its good appearance over a long period of time. <P>SOLUTION: The heat insulating structure constitutes the outer wall surface of a building, and has a heat insulating layer (A), a baseplate layer (B), a coat layer (C) formed of thick-applied paint having flexibility, and a coat layer (D) formed of infrared reflective paint which contains at least (a) infrared reflective fine particles, (b) a synthetic resin, and (c) hollow particles. These layers (A) to (D) are laminated on each other in this order from the inside to the outside of the wall surface. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０１０３】
【表２】

【０１０４】
なお、赤外線反射性塗料１に使用した原料は以下の通りである。
・中空粒子：閉気泡型中空樹脂ビーズ（アクリル−アクリロニトリル共重合樹脂、平均粒子径４５μｍ、密度０．０２５ｇ／ｃｍ^３）
・赤外線反射性粉体：酸化チタン（平均粒子径０．３μｍ、分光反射率８５％）
・造膜助剤：２，２，４−トリメチル−１，３−ペンタンジオールモノイソブチレート
・増粘剤：ポリカルボン酸系増粘剤
・消泡剤：シリコーン系消泡剤
【０１０５】
（赤外線反射性塗料２）
表１に示す合成例２のモノマー組成比、表２に示す原料配合以外は、赤外線反射性塗料１と同様の方法で赤外線反射性塗料２を得た。
【０１０６】
（赤外線反射性塗料３）
まず、表１に示す合成例３のモノマー組成比で、以下に示す方法にて、エマルションを得た。
反応容器に、脱イオン水７０重量部、ドデシルベンゼンスルホン酸ナトリウム０．２重量部を仕込み、攪拌及び窒素置換を行いながら７０℃まで昇温し、過硫酸アンモニウム０．４重量部を添加した。これに、別途用意した乳化モノマー（脱イオン水２０重量部にドデシルベンゼンスルホン酸ナトリウム０．１重量部を溶解させた水溶液に、スチレン２６．５重量部、ｎ−ブチルアクリレート６８．５重量部、メタクリル酸３．０重量部、アクリルアミド２．０重量部を乳化分散させたもの）を３時間かけて連続的に滴下した。滴下終了後２時間熟成を行った。次いで、アンモニア水を添加してｐＨを７．５に調整した後、２００メッシュの金網にてろ過することによりエマルションを製造した。
次に、合成例３によって得られたエマルションに対し、中空粒子、赤外線反射性粉体等を表２に示す比率で混合して均一に攪拌することにより赤外線反射性塗料３を得た。
【０１０７】
（赤外線反射性塗料４）
表２に示す原料配合以外は、赤外線反射性塗料２と同様の方法で赤外線反射性塗料４を製造した。
【０１０８】
（赤外線反射性塗料５）
表２に示す原料配合以外は、赤外線反射性塗料３と同様の方法で赤外線反射性塗料５を製造した。
【０１０９】
−水性塗料の製造−
（水性塗料１）
合成樹脂エマルション１の２００重量部に対し、ペリレンレッド、ベンズイミダゾロンイエロー、フタロシアニンブルーの混合物を２０重量部、２，２，４−トリメチル−１，３−ペンタンジオールモノイソブチレートを１０重量部、ウレタン系増粘剤を２．５重量部、シリコーン系消泡剤を０．５重量部混合することにより水性塗料１を製造した。
【０１１０】
なお、水性塗料１に使用した合成樹脂エマルション１は以下の通りである。
・合成樹脂エマルション１：アクリルシリコン樹脂エマルション（Ｔｇ２５℃、固形分５０重量％、ｐＨ７、シリコン成分量（ＳｉＯ_２換算）３重量％、モノマー組成：メチルメタクリレート、ｎ−ブチルアクリレート、γ−メタクリロイルオキシプロピルトリメトキシシラン、アクリル酸、２−ヒドロキシエチルメタクリレート、メチルトリメトキシシラン、ジメチルジメトキシシラン）
【０１１１】
（水性塗料２）
合成樹脂エマルション１に代えて合成樹脂エマルション２を使用した以外は水性塗料１と同様にして水性塗料２を得た。
【０１１２】
なお、水性塗料２に使用した合成樹脂エマルション２は以下の通りである。
・合成樹脂エマルション２：アクリルシリコン樹脂エマルション（Ｔｇ２５℃、固形分５０重量％、ｐＨ８、シリコン成分量（ＳｉＯ_２換算）０．５重量％、モノマー組成：メチルメタクリレート、ｎ−ブチルアクリレート、γ−メタクリロイルオキシプロピルトリメトキシシラン、アクリル酸）
【０１１３】
＜水蒸気透過度試験＞
赤外線反射性塗料の水蒸気透過度試験
離型紙を貼ったガラス板の上にろ紙を置き、このろ紙上に乾燥膜厚が１．０ｍｍとなるように各赤外線反射性塗料をそれぞれ塗付し、温度２３℃、相対湿度５０％雰囲気下（以下、標準状態という）で１週間養生を行った。養生後、各赤外線反射性塗料がそれぞれ塗付されたろ紙を剥がし、その水蒸気透過度をＪＩＳ Ｋ５４００ ８．１７−１９９０「水蒸気透過度」に準じて測定した。結果は、表３に示す。
◎：水蒸気透過度が６０ｇ／ｍ^２・２４ｈ以上
○：水蒸気透過度が４０ｇ／ｍ^２・２４ｈ以上６０ｇ／ｍ^２・２４ｈ未満
×：４０ｇ／ｍ^２・２４ｈ未満
【０１１４】
【表３】

【０１１５】
水性塗料の水蒸気透過度試験
離型紙を貼ったガラス板の上にろ紙を置き、このろ紙上に乾燥膜厚が５０μｍとなるように各水性塗料をそれぞれ塗付し、標準状態で１週間養生を行った。養生後、各赤水性塗料がそれぞれ塗付されたろ紙を剥がし、その水蒸気透過度をＪＩＳ Ｋ５４００ ８．１７−１９９０「水蒸気透過度」に準じて測定した。結果は、表３に示す。
◎：水蒸気透過度が６０ｇ／ｍ^２・２４ｈ以上
○：水蒸気透過度が４０ｇ／ｍ^２・２４ｈ以上６０ｇ／ｍ^２・２４ｈ未満
×：４０ｇ／ｍ^２・２４ｈ未満
【０１１６】
（実施例１）
フェノール樹脂発泡体（２５ｍｍ厚）の片面に、シーラー処理を施したスレート板（１２ｍｍ厚）を貼着し、スレート板が外側になるように、４５０×４５０×４５０ｍｍのボックスを作製した。次にボックス表面に、厚塗り塗料１を、万能ガンで、玉状に吹付けた後、ミネラルスピリットを付けたプラスチックローラーで玉の凸部を押え、断面が台形状の凹凸を有する４〜８ｍｍの被膜層（Ｃ）を形成させ、試験体１を作製した。
試験体１を作製した後、大阪府茨木市で、３ヶ月間、屋外に設置した後、エアブローによりほこり等を除去し、水で洗浄し、十分乾燥させた後、赤外線反射性塗料１を万能ガンで吹付け、標準状態で８時間乾燥後、水性塗料１をスプレー塗装し、さらに１４日間養生したした。このとき、赤外線反射性塗料１は乾燥膜厚が１ｍｍ、水性塗料１は乾燥膜厚が５０μｍとなるように塗装を行った。
【０１１７】
（被膜の膨れ・剥れ試験）
塗装後、大阪府茨木市で、屋外暴露を実施し、１２ヶ月後の被膜層の表面状態の変化を目視にて観察した。その結果、塗膜層の膨れ、剥れがなく、また、汚れも目立たず、美観性にも優れていた。
【０１１８】
【表４】

【０１１９】
（実施例２）
表４に示すように、赤外線反射性塗料１を赤外線反射性塗料２に替えた以外は、実施例１と同様の方法で被膜層の膨れ・剥れ試験を行なった。その結果、塗膜層の膨れ、剥れがなく、また、汚れも目立たず、美観性にも優れていた。
【０１２０】
（実施例３）
表４に示すように、赤外線反射性塗料１を赤外線反射性塗料３に替えた以外は、実施例１と同様の方法で被膜層の膨れ・剥れ試験を行なった。その結果、塗膜層の膨れ、剥れがほとんどなく、また、汚れも目立たず、美観性も良好であった。
【０１２１】
（実施例４）
表４に示すように、水性塗料１を水性塗料２に替えた以外は、実施例１と同様の方法で被膜層の膨れ・剥れ試験を行なった。その結果、塗膜層の膨れ、剥れがほとんどなく、また、汚れも目立たず、美観性も良好であった。
【０１２２】
（実施例５）
表４に示すように、水性塗料１を塗装しなかった以外は、実施例１と同様の方法で被膜層の膨れ・剥れ試験を行なった。その結果、塗膜層の膨れ、剥れがなく、また、汚れもほとんど目立たなかった。
【０１２３】
（実施例６）
シーラー処理を施した軽量モルタル板（２５ｍｍ厚）を用いて、４５０×４５０×４５０ｍｍのボックスを作製し、その表面に、厚塗り塗料１を、万能ガンで、玉状に吹付けた後、ミネラルスピリットを付けたプラスチックローラーで玉の凸部を押え、断面が台形状の凹凸を有する４〜８ｍｍの被膜層（Ｃ）を形成させ、試験体２を作製した。
試験体２を作製した後、大阪府茨木市で、３ヶ月間、屋外に設置した後、エアブローによりほこり等を除去し、水で洗浄し、十分乾燥させた後、赤外線反射性塗料１を万能ガンで吹付け、標準状態で８時間乾燥後、水性塗料１をスプレー塗装し、さらに１４日間養生したした。このとき、赤外線反射性塗料１は乾燥膜厚が１ｍｍ、水性塗料１は乾燥膜厚が５０μｍとなるように塗装を行った。
塗装後、被膜層の膨れ・剥れ試験を行なった結果、塗膜層の膨れ、剥れがなく、また、汚れも目立たず、美観性にも優れていた。
【０１２４】
（比較例１）
表４に示すように、赤外線反射性塗料１を赤外線反射性塗料４に替えた以外は、実施例１と同様の方法で被膜層の膨れ・剥れ試験を行なった。その結果、塗膜層の膨れ、剥れがみられた。
【０１２５】
（比較例２）
表４に示すように、赤外線反射性塗料１を赤外線反射性塗料５に変えた以外は、実施例１と同様の方法で被膜層の膨れ・剥れ試験を行なった。その結果、塗膜層の膨れ、剥れがみられた。
【０１２６】
【発明の効果】
本発明の断熱構造体は、経時的に膨れ、剥離等が生じることなく、長期にわたりその美観性を維持することができる。[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a heat insulating structure constituting an outer wall surface of a building such as a building, an apartment house, and a detached house.
[0002]
[Prior art]
In buildings, apartment buildings, detached houses, etc., the outer wall structure has thermal insulation to prevent the direct temperature change of the outdoor from affecting the indoors or to improve the airtightness of the indoors. Has been performed. As such a heat-insulating outer wall surface, those provided with various heat-insulating materials such as phenol foam and glass wool on the indoor side of the outer wall surface, those having a heat-insulating base material constituting the outer wall surface, and the like are used. I have.
[0003]
On the other hand, various coating materials are applied and formed on the outer wall surface of the building in order to impart design properties. Among them, the thick coating having a flexible coating layer, such as a flexible thick finish coating material, has a three-dimensional appearance and has fine cracks such as concrete and mortar on the base. It is used favorably because it has a performance that can follow. Here, a thick coating generally contains an aggregate, the surface of the coating layer of which is rough, and is in a state of matte to three-minute luster. In some cases, it is required to have a finish or a smoother coating layer surface, and in this case, various overcoat materials are applied.
[0004]
Further, when the coating layer formed from the thick coating is exposed outdoors for a long period of time, deterioration and contamination progress due to the influence of sunlight, rainfall, dust and the like. This necessitates repainting, and various overcoating materials are applied. Even if the deterioration has not progressed, as described above, when there is a request to change the design properties such as the color and the shape, the repainting with the topcoat material is performed. (For example, Patent Document 1 etc.)
[0005]
[Patent Document 1] JP-A-6-306305
[0006]
[Problems to be solved by the invention]
However, the coating layer formed from the thick coating as described above has a considerably large thickness of about 1 to 10 mm, and components in the coating material such as moisture, a film-forming aid, and a high-boiling solvent are contained in the coating layer. Tend to remain. Furthermore, if the surface of the coating layer is directly exposed to the outside air, the water due to rainfall and the like is absorbed from the surface of the coating layer as the deterioration progresses, the moisture is absorbed from the surface of the coating layer by washing, etc. In some cases, moisture is absorbed from the substrate side, and the moisture tends to stay in the coating layer.
[0007]
As described above, the inside of the flexible coating layer formed from the thick coating material may contain vaporizable components such as moisture, a film-forming aid, and a high-boiling solvent. When such a coating layer is applied to the heat-insulating outer wall surface, the temperature of the coating layer rises due to irradiation of sunlight, and the high-temperature state continues for a long time, so that the vaporizable components present inside the coating layer are vaporized. In some cases, the coating layer swells with the lapse of time due to the action such as volume expansion, and peeling or the like occurs, which may impair the aesthetic appearance.
In particular, in a flexible coating layer formed from a thick coating material laminated on a layer having heat insulating properties, there is a tendency that heat is easily trapped near the interface between the layer having heat insulating properties and the coating layer, The above problem is more likely to occur.
[0008]
The present invention has been made in view of such problems, moisture, a film-forming aid and a high-boiling solvent and the like in a flexible coating layer formed from a thick coating material that easily remains, such as swelling of the coating layer, It is an object of the present invention to provide a heat-insulating structure having heat-insulating properties without peeling or the like.
[0009]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve such problems, and as a result, at least an infrared-reflective powder, a synthetic resin, and hollow particles were added to a flexible coating layer formed from a thick coating. By laminating the coating layer formed from the infrared reflective coating contained, it reflects infrared rays which is one of the causes of temperature rise, suppresses the temperature rise of the coating layer, and can suppress the vaporization of the vaporizable component, Swelling of the coating layer, found a heat insulating structure having a heat insulating property without peeling, etc.,
Furthermore, since the coating layer formed from the infrared reflective paint has a specific water vapor permeability, vaporizable components such as moisture remaining in the flexible coating layer formed from the thick coating paint are removed. The present inventors have found a heat-insulating structure having heat-insulating properties that can diffuse and diffuse outside the layer and can further prevent swelling and peeling of the coating layer, and have completed the present invention.
[0010]
That is, the present invention has the following features.
1. A heat insulating structure constituting an outer wall surface of a building, wherein the heat insulating layer (A), the base material layer (B),
A flexible coating layer (C) formed from a thick coating;
A coating layer (D) formed from at least (a) an infrared-reflective powder, (b) a synthetic resin, and (c) an infrared-reflective paint containing hollow particles,
A heat insulating structure, comprising:
2. A heat-insulating structure constituting an outer wall surface of a building, wherein the heat-insulating substrate layer (B ′) extends from the indoor side to the outdoor side of the wall,
A flexible coating layer (C) formed from a thick coating;
A coating layer (D) formed from at least (a) an infrared-reflective powder, (b) a synthetic resin, and (c) an infrared-reflective paint containing hollow particles,
A heat insulating structure, comprising:
3. The water vapor permeability of the coating layer (D) according to JIS K 5400 8.17-1990 is 40 g / m. ² -It is 24 hours or more. Or 2. 3. The heat insulating structure according to claim 1.
4. Furthermore, on the outdoor side, it is formed of a water-based paint and has a water vapor permeability of 40 g / m according to JIS K 5400 8.17-1990. ² -It has a coating layer (E) of 24 hours or more. From 3. The heat insulating structure according to any one of the above.
5. The coating layer (D) is (a) an infrared-reflective powder, (b) a crosslinkable synthetic resin emulsion having a glass transition temperature of −50 to 50 ° C. and having a reactive functional group, and (c) hollow particles. Characterized by being formed from an infrared reflective paint containing From 4. A heat insulating structure according to any one of the above.
6. The weight ratio of each component in the infrared reflective paint for forming the coating layer (D) is 1 to 400 parts by weight of the component (a) and 0.5 to 0.5 parts by weight of the component (c) based on 100 parts by weight of the solid content of the component (b). 200 parts by weight. To 5. A heat insulating structure according to any one of the above.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The heat-insulating structure of the present invention comprises a heat-insulating layer (A), a base material layer (B), a flexible coating layer (C) formed from a thick paint, from the indoor side to the outdoor side of the wall surface, At least (a) an infrared-reflective powder, (b) a synthetic resin, and (c) a coating layer (D) formed of an infrared-reflective paint containing hollow particles.
[0012]
[Heat insulation layer]
The heat-insulating layer (hereinafter also referred to as “(A) layer”) is located closest to the indoor side in the heat-insulating structure of the present invention. This is a layer provided to obtain an effect such as enhancing the airtightness of the film. Examples of the material constituting the layer (A) include a polystyrene foam, a polyurethane foam, an acrylic resin foam, a phenol resin foam, glass wool, rock wool, foamed ceramic, and the like, or a composite thereof. can give. An air layer sandwiched between various substrates is also included in the (A) layer. Specifically, it is desirable that such a layer (A) has a heat insulating property having a thermal conductivity of 0.5 kcal / m · hr · ° C. or less.
[0013]
[Base material layer]
The substrate layer (hereinafter, also referred to as “(B) layer”) in the present invention is not particularly limited as long as it constitutes the outer wall surface of the building. For example, concrete, mortar, cement board, extruded plate, slate Board, PC board, ALC board, fiber reinforced cement board, metal board, porcelain tile, metal siding board, ceramic siding board, ceramic board, gypsum board, plastic board, hard wood chip cement board, PVC extrusion siding board, plywood, etc. Or a complex thereof.
Such a base material layer may have a surface treatment layer (for example, a sealer layer, a surfacer layer, etc.) in advance, or may have a coating layer already formed.
[0014]
[Heat-insulating substrate layer]
The heat-insulating base material layer (hereinafter also referred to as “(B ′) layer”) in the present invention is, among the above-described base material layers, specifically having a thermal conductivity of 0.5 kcal / m · hr · ° C. or less. It has thermal insulation. Such a layer (B ') itself has heat insulating properties, and thus the heat insulating layer can be omitted. As the base material constituting the (B ′) layer, for example, lightweight mortar, lightweight concrete, foamed concrete plate, calcium silicate plate, perlite cement plate, gypsum board, rock wool plate, glass wool heat insulating plate, or a composite thereof Body and the like. Such a layer (B ′) may have a surface treatment layer in the same manner as the above-described base layer.
[0015]
[Coating layer (C)]
The coating layer (C) (hereinafter, also referred to as “(C) layer”) in the present invention is formed by forming the coating from a thick coating and has flexibility. It has the ability to provide a three-dimensional pattern and follow fine cracks in the base material layer.
[0016]
The flexible coating layer (C) has a glass transition temperature (hereinafter abbreviated as "Tg") of generally -50 to 30C, preferably -30 to 20C, and more preferably -15 to 10C. A coating layer formed from a thick coating material using a thermoplastic resin of about ° C as a binder can be suitably used.
Note that Tg in the present invention is a value obtained by a Fox calculation formula.
[0017]
The thick coating material for forming this film is, for example, a coating material composed of the following components in addition to a thick finishing material defined in JIS A 6909 to which flexibility is imparted. Approximately 1.5 to 15 kg / m ² The thickness of the coating film formed by applying the above (however, it indicates the thickness of the top portion) is approximately 1 to 10 mm. This thick-coat paint is applied in an amount of 0.2 to 0.3 kg / m of a flat paint which is generally widely recognized as a paint. ² The film thickness is considerably thicker than that of the film thickness of 50 to 100 μm.
[0018]
Such a thick coating composition mainly contains a binder, an aggregate, an inorganic powder, a pigment, a solvent, and the like as constituent components.
[0019]
As the binder, for example, a water-dispersible type, a water-soluble type, a weak solvent-soluble type, a solvent-soluble type, a synthetic resin such as an NAD type can be used, and a water-dispersed type and a water-soluble type are particularly preferable. Used for As the synthetic resin, for example, vinyl acetate resin, polyacrylic resin, petroleum resin, polyamide resin, alkyd resin, polyester resin, polyurethane resin, polyvinyl chloride, chlorine resin such as chlorinated polyethylene, polyethylene, polypropylene, polyisobutylene, ethylene Examples include olefin resins such as propylene copolymers, polystyrene resins, cellulose resins such as ethyl cellulose, and thermoplastic resins such as ABS resins and AS resins.
[0020]
Aggregates include, for example, crushed materials such as marble, granite, limestone, serpentine, granite, fluorite, cold water stone, feldspar, quartzite, quartz sand, sand, etc., crushed ceramics, crushed ceramics, crushed glass, glass beads , Resin pulverized products, resin beads, metal particles, and the like, and those whose surfaces are colored and coated.
[0021]
Examples of the inorganic powder include calcium carbonate, kaolin, diatomaceous earth, white carbon, talc, barite powder, precipitated barium sulfate, barium carbonate, wollastonite, mica, clay and the like.
[0022]
Examples of the pigment include inorganic pigments such as titanium oxide, zinc oxide, carbon black, graphite, red iron oxide, ocher, chrome green, and ultramarine blue, β-naphthol, naphthol AS, pyrazolone, and benzimidazolone. Insoluble azo pigments such as permanent red and lake red, condensed polycyclic pigments such as anthraquinone, perylene and quinacridone, monoazo pigments such as fast yellow and benzimidazolone yellow, and disazos such as permanent yellow Pigments, condensed azo pigments such as isoindolinone yellow, anthraquinone pigments, quinophthalone yellow pigments such as quinophthalone yellow, and organic pigments such as phthalocyanine green, phthalocyanine blue, and quinacridone violet.
[0023]
Examples of the solvent include water and an organic solvent.Examples of the organic solvent include alcohols such as methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, and t-butyl alcohol; Ethylene glycol, propylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, ethylene glycols such as triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, Propylene glycols such as dipropylene glycol monomethyl ether; n-methylpyrrolidone; Ketones such as ton, methyl ethyl ketone and methyl isobutyl ketone; aromatic hydrocarbons such as toluene and xylene; aliphatic hydrocarbons such as cyclohexane, isoparaffin, cyclohexanone and mineral spirits; methyl acetate, ethyl acetate, n-propyl acetate and isopropyl acetate And the like, and mixtures thereof.
[0024]
In addition, film forming aids, plasticizers, preservatives, antifungal agents, antialgal agents, antifoaming agents, leveling agents, pigment dispersants, anti-settling agents, anti-sagging agents, matting agents, which are generally used as paint additives An agent, an ultraviolet absorber and the like can be appropriately compounded to such an extent that the effects of the present invention are not impaired.
[0025]
Such a thick coating paint can impart flexibility to the (C) layer by adjusting the Tg of the synthetic resin and the mixing ratio of each component, for example.
For example, the Tg of the synthetic resin may be generally about -50 to 30C, preferably about -30 to 20C, and more preferably about -15 to 10C.
[0026]
The layer (C) can be laminated by, for example, applying a thick coating.
In the application of the thick coating, known coating equipment can be used. As the coating device, for example, a spray, a gun, a roller, a brush, an iron, and the like can be used. At the time of painting, water can be used to dilute the paint. The amount of water to be mixed may be appropriately set according to the coating equipment used, the desired surface shape, and the like.
[0027]
The thickness of the layer (C) is usually from 1 to 10 mm, and the cross section may have an irregular shape such as a ball shape or a trapezoid shape. In general, a coating layer having a ball-shaped cross section can be formed by blow-off finishing, and a coating layer having a trapezoidal cross-section can be formed by using a roller, a trowel, a brush, etc. after performing blow-off finishing. It can be formed by performing a pressing process.
[0028]
[Coating layer (D)]
The coating layer (D) (hereinafter also referred to as “(D) layer”) in the present invention comprises at least (a) an infrared-reflective powder (hereinafter referred to as “(a) component”) and (b) a synthetic resin (hereinafter “(( (b) component) and (c) hollow particles (hereinafter, referred to as “(c) component”).
[0029]
By containing the component (a), infrared rays such as sunlight can be reflected, and the temperature rise of the layers (C) and (D) can be suppressed.
[0030]
Examples of the component (a) include aluminum flake, titanium oxide, barium sulfate, zinc oxide, calcium carbonate, silicon oxide, magnesium oxide, zirconium oxide, yttrium oxide, indium oxide, and alumina (provided that (c) Excluding ingredients). These can be used alone or in combination of two or more. Among them, in the present invention, at least one selected from titanium oxide and zinc oxide is preferable.
[0031]
As for the component (a), the value obtained by measuring the spectral reflectance to light having a wavelength of 800 to 2100 nm and calculating the average value is 20% or more (preferably 40% or more, more preferably 60% or more). Above, more preferably 80% or more).
[0032]
Note that the spectral reflectance is a value measured by a spectrophotometer (UV-3100, manufactured by Shimadzu Corporation) in a wavelength range of 800 to 2100 nm, and the spectral reflectance of a white plate obtained by solidifying barium sulfate fine powder is used. It is a value indicated by its relative value assuming that it is 100%.
[0033]
The average particle diameter of the component (a) is usually 0.1 to 10 μm, preferably 0.1 to 1 μm. When the average particle diameter is in such a range, the infrared reflectivity can be further increased.
[0034]
The weight ratio of the component (a) is preferably 1 to 400 parts by weight (preferably 2 to 200 parts by weight) based on 100 parts by weight of the solid content of the component (b) described later. By mixing at such a ratio, it becomes possible to form a coating layer having excellent infrared reflectivity and sufficient coating strength. When the amount of the component (a) is less than 1 part by weight, the temperature of the coating layer tends to increase due to sunlight or the like. In addition, sufficient film strength cannot be obtained, and swelling, peeling, and the like are likely to occur. If the amount is more than 400 parts by weight, peeling, cracking and the like are likely to occur.
[0035]
The component (b) acts as a binder in the infrared reflective paint, and is, for example, an acrylic resin, a urethane resin, an acrylic urethane resin, a silicone resin, an acrylic silicone resin, a fluororesin, an epoxy resin, a vinyl acetate resin, and vinyl chloride. One or more of water-dispersible, water-soluble, weak solvent-soluble, solvent-soluble, and NAD types of resins, polyvinyl alcohol resins, ethylene resins, and the like can be used in combination. In the present invention, it is particularly preferable to use one or more of a water dispersion type, a water soluble type and the like in combination.
[0036]
In particular, in the present invention, it is preferable to use a synthetic resin emulsion, acrylic resin emulsion, urethane resin emulsion, acrylic urethane resin emulsion, silicone resin emulsion, acrylic silicone resin emulsion, fluororesin emulsion, epoxy resin emulsion, vinyl acetate resin emulsion, It is preferable to use one kind or a mixture of two or more kinds such as a vinyl chloride resin emulsion, a polyvinyl alcohol resin emulsion, and an ethylene resin emulsion.
[0037]
When a cross-linking reaction type synthetic resin emulsion having a reactive functional group is used among the components (b), a functional group capable of reacting with the reactive functional group is formed at the time of forming the coating layer or after forming the coating layer. A crosslinked structure can be formed by the reaction of (1), a strong coating layer can be formed, and swelling and peeling of the coating layer can be prevented. The functional group capable of reacting with the reactive functional group may be contained in the component (b), or may be contained in a separately mixed crosslinking agent.
[0038]
Examples of combinations of such reactive functional groups include, for example, a carboxyl group and a metal ion, a carboxyl group and a carbodiimide group, a carboxyl group and an epoxy group, a carboxyl group and an aziridine group, a carboxyl group and an oxazoline group, a hydroxyl group and an isocyanate group, and a carbonyl group. Groups and hydrazide groups, epoxy groups and amino groups, and alkoxyl groups. These can be used alone or in combination of two or more.
[0039]
The Tg of the component (b) is preferably set at -50 to 50C, more preferably at -40 to 20C. If the Tg is lower than -50 ° C, the strength of the layer (D) becomes insufficient, and swelling, peeling, and the like are likely to occur. When Tg is higher than 50 ° C., sufficient adhesion performance cannot be obtained, and swelling, peeling, and the like are likely to occur. In addition, the ability to follow the layer (C) is reduced, and cracks are likely to occur.
The average particle size of the synthetic resin emulsion in the component (b) may usually be about 0.05 to 0.2 μm.
[0040]
As the monomer constituting the component (b), various monomers can be used. Examples of usable monomers include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n-amyl (meth) acrylate, and isoamyl (Meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate, cyclohexyl (meth) acrylate (Meth) acrylate monomers such as phenyl (meth) acrylate and benzyl (meth) acrylate;
Epoxy group-containing monomers such as glycidyl (meth) acrylate, diglycidyl (meth) acrylate, and allyl glycidyl ether;
Carboxyl group-containing monomers such as acrylic acid, methacrylic acid, crotonic acid, maleic acid or its monoalkyl ester, itaconic acid or its monoalkyl ester, fumaric acid or its monoalkyl ester;
Contains an amino group such as N-methylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminoethyl vinyl ether, N- (2-dimethylaminoethyl) acrylamide, N- (2-dimethylaminoethyl) methacrylamide, etc. monomer;
Pyridine monomers such as vinylpyridine;
Hydroxyl-containing monomers such as 2-hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate;
Vinyl ester monomers such as vinyl acetate and vinyl propionate;
Nitrile group-containing monomers such as acrylonitrile and methacrylonitrile;
Aromatic monomers such as styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene and divinylbenzene;
Amide group-containing monomers such as acrylamide, methacrylamide, maleic amide, N-methylol (meth) acrylamide, and diacetone acrylamide;
Carbonyl group-containing monomers such as acrolein, diacetone (meth) acrylamide, vinyl methyl ketone, vinyl ethyl ketone, and vinyl butyl ketone;
Alkoxysilyl groups such as vinyltrimethoxysilane, vinyltriethoxysilane, γ- (meth) acryloyloxypropyltrimethoxysilane, γ- (meth) acryloyloxypropyltriethoxysilane, and γ- (meth) acryloyloxypropylmethyldimethoxysilane Monomer contained;
Vinylidene halide monomers such as vinylidene chloride and vinylidene fluoride;
Other examples include ethylene, propylene, isoprene, butadiene, vinylpyrrolidone, vinyl chloride, vinyl ether, vinyl ketone, vinylamide, and chloroprene. These can be used alone or in combination of two or more.
[0041]
In the present invention, by setting the Tg of the component (b) to a specific value and further forming a crosslinked structure by a reactive functional group, the strength of the (D) layer is improved, and the water vapor permeability of the (D) layer is improved. And the effect of diffusing and dispersing vaporizable components such as moisture in the coating layer is enhanced. Further, the cross-linking reactivity due to the reactive functional group also has an effect of increasing the adhesion to the top coating when the top coating is applied. In the present invention, such effects can prevent swelling, peeling, and the like. Further, in the present invention, among the component (b), by using a cross-linking reaction type synthetic resin emulsion having a reactive functional group, coating properties such as strength, water resistance, impact resistance, and alkali resistance can be enhanced. .
[0042]
One preferred component (b) in the present invention is (b-1) a crosslinking reaction type synthetic resin emulsion having an epoxy group (hereinafter, referred to as “component (b-1)”). The component (b-1) can be obtained by copolymerizing an epoxy group-containing monomer as an essential component among the above monomers. Examples of the functional group capable of reacting with the epoxy group include a carboxyl group and an amino group.
[0043]
In addition to the component (b-1), the component (b) suitable in the present invention includes (b-2) a cross-linking reaction type synthetic resin emulsion having a functional group capable of reacting with an epoxy group (hereinafter referred to as “(b- 2) component)). The component (b-2) can be obtained by copolymerizing at least one selected from a carboxyl group-containing monomer, an amino group-containing monomer, and a pyridine monomer among the above-mentioned monomers as an essential component.
[0044]
When the component (b-2) is used, an epoxy group-containing crosslinking agent can be used in combination. Examples of such an epoxy group-containing crosslinking agent include polyethylene glycol diglycidyl ether, polyhydroxyalkane polyglycidyl ether, diglycerol polyglycidyl ether, and sorbitol polyglycidyl ether. These can be used alone or in combination of two or more.
[0045]
The most preferred component (b) in the present invention includes (b-3) at least two layers of a core part and a shell part, and the shell part has a Tg of -20 to 50C (preferably -20 to 20C). The core portion has a Tg of -50 to 0 ° C (preferably -40 to 0 ° C), the shell portion has a higher Tg than the core portion, and the core portion has an epoxy group; A cross-linking reaction type multilayer emulsion having a functional group capable of reacting with the epoxy group (hereinafter referred to as “component (b-3)”).
[0046]
This component (b-3) is a multilayer emulsion containing at least two layers, a core part and a shell part. Here, the core portion means an inner layer portion of the multilayer emulsion, and is a layer other than the outermost layer portion. The shell means the outermost layer of the multilayer emulsion. The component (b-3) may have a three-layer structure having an intermediate portion between the core portion and the shell portion, or may have a multilayer structure having a plurality of intermediate portions.
In the present invention, by using the component (b-3), the strength and the water vapor permeability of the layer (D), and the adhesion to the top coat can be improved, and blistering and peeling are prevented. The effect can be further enhanced.
[0047]
In order to generate an epoxy group in the core of the component (b-3), an epoxy group-containing monomer among the above monomers may be used as a monomer constituting the core. Glycidyl methacrylate is particularly preferred as the epoxy group-containing monomer.
[0048]
In order to generate a functional group capable of reacting with an epoxy group in the shell part of the component (b-3), the monomers constituting the shell part include carboxyl group-containing monomers, amino group-containing monomers, and pyridine-based monomers among the above monomers At least one selected from the following may be used. Of these, a carboxyl group-containing monomer is preferred in the present invention. As the carboxyl group-containing monomer, at least one selected from acrylic acid and methacrylic acid is particularly preferable.
[0049]
When a carboxyl group-containing monomer or the like is used as a monomer constituting the shell portion, it is preferable to use an amide group-containing monomer in combination. Use of such an amide group-containing monomer is advantageous in that the reaction of the epoxy group during the storage of the coating material is sufficiently suppressed, and swelling, peeling, and the like are prevented. As the amide group-containing monomer, one or more selected from acrylamide and methacrylamide are particularly preferable.
[0050]
The amount of the epoxy group-containing monomer to be used is generally 0.1 to 40% by weight, preferably 0.5 to 20% by weight, based on the total amount of the monomers constituting the multilayer emulsion.
The amount of the monomer having a functional group capable of reacting with the epoxy group is usually 0.1 to 40% by weight, preferably 0.5 to 20% by weight, based on the total amount of the monomers constituting the multilayer emulsion.
When an amide group-containing monomer is used in the shell portion, its amount is preferably 0.5 to 5% by weight based on the total amount of the monomers constituting the multilayer emulsion.
[0051]
In an emulsion having an epoxy group in a core portion and a functional group capable of reacting with the epoxy group in a shell portion, any of an epoxy group and a functional group capable of reacting with the epoxy resin may be provided between the core portion and the shell portion. By providing an intermediate portion made of an inert copolymer, the storage stability of the paint can be enhanced. Examples of the monomer constituting the copolymer which is inert to both the epoxy group and the functional group capable of reacting with the epoxy resin include (meth) acrylate monomers, hydroxyl group-containing monomers and vinyl ester monomers among the above-mentioned monomers. , A nitrile group-containing monomer, an aromatic monomer, an amide group-containing monomer, and a vinylidene halide monomer. These can be used alone or in combination of two or more.
[0052]
The method for producing the component (b) is not particularly limited, and can be produced by a known method. For example, it can be produced by emulsion polymerization, seed emulsion polymerization, soap-free emulsion polymerization, feed emulsion polymerization, suspension polymerization, dispersion polymerization, seed dispersion polymerization, feed dispersion polymerization, solution polymerization, oxidation-reduction polymerization, and the like. It can also be produced by multi-stage polymerization. Further, it can also be produced by dispersing in an aqueous medium or a hydrophilic medium after polymerization. At this time, if necessary, an initiator, an emulsifier, a dispersant, a chain transfer agent, a buffer and the like, or other additives can be appropriately added.
[0053]
The initiator is not particularly limited, and known initiators can be used, for example, persulfates such as hydrogen peroxide, ammonium persulfate and potassium persulfate; azobisisobutyronitrile and its hydrochloride; cumene Organic peroxides such as hydroperoxide and t-butyl hydroperoxide: these persulfates or peroxides, metal ions such as iron ions, sodium sulfoxylate, formaldehyde, sodium pyrosulfite, L-ascorbic acid And redox initiators in combination with a reducing agent. The amount of these used is not particularly limited, but may be about 0.1 to 5 parts by weight based on 100 parts by weight of the monomer mixture.
[0054]
The emulsifier is not particularly limited, and known emulsifiers can be used.For example, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium alkyldiphenyletherdisulfonate, sodium alkylnaphthalenesulfonate, sodium dioctyl sulfosuccinate, poly Anionic emulsifiers such as sodium oxyethylene alkyl ether sulfate and sodium polyoxyethylene alkyl phenyl ether sulfate: polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, oxyethylene. Nonionic emulsifiers such as oxypropylene block copolymers; lauryl trimethyl ammonium chloride, Allyl trimethyl ammonium chlorite, cationic emulsifiers such as trimethyl octadecyl ammonium chlorite and the like. Further, it is preferable to use a reactive emulsifier having an ethylenically unsaturated double bond, since the water resistance of the coating layer can be improved. The amount of the emulsifier used is not particularly limited, but may be about 0.01 to 20 parts by weight based on 100 parts by weight of the monomer mixture.
[0055]
The component (c) is a component having infrared reflectivity and imparting heat insulation. By containing the component (c), it reflects infrared rays such as sunlight, insulates external temperature and the like, and suppresses a rise in the temperature of the coating layer. Can be prevented.
[0056]
Examples of the component (c) include hollow ceramic beads and hollow resin beads. Examples of the ceramic component constituting the hollow ceramic beads include sodium silicate glass, aluminum silicate glass, sodium borosilicate glass, carbon, alumina, shirasu, and obsidian. As the resin component constituting the hollow resin beads, for example, acrylic resin, styrene resin, acrylic-styrene copolymer resin, acrylic-acrylonitrile copolymer resin, acrylic-styrene-acrylonitrile copolymer resin, acrylonitrile-methacrylonitrile copolymer resin, An acryl-acrylonitrile-methacrylonitrile copolymer resin, a vinylidene chloride-acrylonitrile copolymer resin and the like can be mentioned. These can be used alone or in combination of two or more. A resin component as the component (c) is advantageous in that it has a low thermal conductivity.
Examples of the shape of the component (c) include a sphere, an ellipse sphere, and a flat sphere.
[0057]
The component (c) has a hollow structure, and is classified into open-cell hollow particles and closed-cell hollow particles when focusing on the structure. Among them, in the present invention, closed-cell hollow particles are preferable. When the closed-cell hollow particles are used, it is possible to prevent the resin component and the like from entering the cells, and thus it is possible to exhibit high heat insulating performance. The internal structure of the closed-cell hollow particles may be a single hollow type having one hollow per particle, or a multi-hollow type having two or more hollows per particle. .
[0058]
The hollow portion of the component (c) is usually filled with a gas, but it is also possible to use a hollow portion having a vacuum. Examples of the gas that can be filled in the hollow portion include air, aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated hydrocarbons, fluorinated chlorinated hydrocarbons, and volatile monomers. Of these, aliphatic hydrocarbons are preferred.
[0059]
The average particle size of the component (c) is usually from 0.1 to 200 μm, preferably from 1 to 150 μm. When the average particle diameter is in such a range, a coating layer having high smoothness can be formed. In addition, concealing properties, infrared reflectivity, and the like can be improved.
[0060]
The density of the component (c) is usually 0.01 to 1 g / cm. ³ , Preferably 0.01 to 0.5 g / cm ³ It is. When the density is in such a range, heat insulation, lightness, and the like can be improved.
[0061]
The weight ratio of the component (c) is preferably 0.5 to 200 parts by weight, more preferably 1 to 100 parts by weight, based on 100 parts by weight of the solid content of the component (b).
When the amount of the component (c) is less than 0.5 part by weight, it is difficult to obtain sufficient infrared reflection performance and heat insulation performance. If the amount is more than 200 parts by weight, swelling, peeling, cracking and the like are likely to occur.
[0062]
Further, the infrared reflective coating preferably contains (d) a porous powder (hereinafter, referred to as “component (d)”).
[0063]
The component (d) is a component having a hysteresis characteristic in water vapor absorption / desorption. The component (d) adsorbs moisture in the atmosphere and moisture in the (C) layer, and can desorb moisture as the temperature rises. At that time, since heat is taken away by the latent heat of evaporation of water, the rise in temperature can be suppressed. Furthermore, the hysteresis characteristic allows the absorption of moisture in the atmosphere and moisture in the (C) layer in a low temperature state such as at night, and exerts an effect of suppressing a temperature rise due to desorption during a high temperature day. Can be.
[0064]
The component (d) is not particularly limited as long as it is porous. For example, porous powders of clay minerals such as silica gel, zeolite, sodium sulfate, alumina, activated carbon, and allophane can be used. As the component (d), one or more selected from silica gel, zeolite, activated carbon, and allophane are preferred, and among them, silica gel is most preferred.
[0065]
The specific surface area of the component (d) is 100 m ² / G or more (preferably 200 m ² / G or more, more preferably 300 m ² / G or more), and by having such a specific surface area, a high temperature rise suppressing effect can be exhibited. The specific surface area is a value measured by the BET method.
[0066]
The weight ratio of the component (d) is preferably 10 to 600 parts by weight based on 100 parts by weight of the solid content of the component (b). If the amount of the component (d) is less than 10 parts by weight, sufficient adsorption / desorption performance and hysteresis characteristics cannot be obtained. If the amount exceeds 600 parts by weight, the layer (D) tends to be brittle, and cracks are more likely to occur.
[0067]
In the infrared-reflective paint of the present invention, in addition to the above-mentioned components, additives which can be usually blended with the paint can be added within a range not to impair the effects of the present invention. Such additives include, for example, water, solvents, crosslinking agents, catalysts, pigments, dyes, aggregates, matting agents, fibers, thickeners, leveling agents, plasticizers, film-forming auxiliaries, antifreezing agents And preservatives, antibacterial agents, fungicides, dispersants, defoamers, pH adjusters, ultraviolet absorbers, antioxidants and the like.
[0068]
The layer (D) can be laminated by, for example, applying an infrared reflective paint. Such an infrared-reflective paint can be formed by uniformly mixing the above-mentioned components with various mixers and applying the mixture using a known coating device to form a coating layer. As the coating device, for example, a spray, a gun, a roller, a brush, an iron, and the like can be used. When precoating is performed, a roll coater, a flow coater, or the like can be used. At the time of painting, water can be used to dilute the paint. The amount of water to be mixed may be appropriately set according to the coating equipment used, the desired surface shape, and the like.
[0069]
Since the infrared reflective paint of the present invention has a suitable thixotropy, a coating layer having a thickness on the order of mm can be formed with a small number of coatings. At this time, even if a vertical surface such as a wall surface is painted, it is possible to sufficiently prevent the occurrence of sagging and the like. The dry film thickness of the film formed by the infrared reflective paint is usually 0.1 to 10 mm, preferably 0.5 to 5 mm.
[0070]
The layer (D) can be formed at any time after the layer (C) is formed.
In particular, the infrared-reflective paint of the present invention has excellent adhesion to various existing coating layers, and thus can be suitably used for renovation / renovation. At this time, the infrared reflective paint of the present invention can exhibit the function of adjusting the base and the function of adjusting the surface shape, and can be finished in a shape different from the surface shape of the existing coating layer.
Examples of the surface shape of the coating film formed of the infrared-reflective paint include a smooth shape, a yuzu skin shape, a spray tile shape, and a rippled shape.
[0071]
The layer (D) of the present invention preferably has water vapor permeability. For example, the water vapor permeability according to JIS K5400 “General Paint Test Method” 8.17-1990 has a water vapor permeability of 40 g / m. ² ・ 24h or more (preferably 60g / m ² 24 h or more).
(D) The layer has a water vapor permeability of 40 g / m. ² When the length is 24 hours or more, the vaporizable components generated from the layer (C) are diffused and scattered out of the coating layer, and swelling and peeling of the coating layer can be further prevented. (D) The layer has a water vapor permeability of 40 g / m. ² -If it is less than 24 hours, swelling or peeling is likely to occur in the coating layer.
[0072]
Further, the layer (D) preferably has an appropriate elongation. For example, the elongation at 20 ° C. (hereinafter, also simply referred to as “elongation”) is 5 to 500%, and more preferably 30 to 500%. Preferably it is 300%. Since the (D) layer has an appropriate elongation, the occurrence of cracks is suppressed. If the elongation is more than 500%, swelling and peeling may occur. If the elongation is less than 5%, there is a risk of cracking.
[0073]
The adhesion strength of the (D) layer to the (C) layer is 0.3 N / mm. ² It is desirable that this is the case. By having such an adhesive strength, the adhesiveness can be maintained for a long time.
[0074]
The spectral reflectance of the layer (D) is preferably 20% or more (preferably 40% or more, more preferably 60% or more, more preferably 80% or more) in a wavelength range of 800 to 2100 nm.
(D) When the spectral reflectance of the layer is 20% or more, infrared rays can be efficiently reflected, a temperature rise can be suppressed, and swelling and peeling of the coating layer can be prevented.
[0075]
Note that the spectral reflectance is a value measured by a spectrophotometer (UV-3100, manufactured by Shimadzu Corporation) in a wavelength range of 800 to 2100 nm, and the spectral reflectance of a white plate obtained by solidifying barium sulfate fine powder is used. It is a value indicated by its relative value assuming that it is 100%.
[0076]
[Coating layer (E)]
In the present invention, after laminating the (D) layer, a water vapor permeable coating layer (E) (hereinafter also referred to as “(E) layer”) formed from an aqueous paint may be laminated.
[0077]
Specifically, such a layer (E) has a water vapor permeability of 40 g / m according to JIS K5400 “General Paint Test Method” 8.17-1990. ² ・ 24h or more, further 60g / m ² -It is preferable that it is 24 hours or more.
(E) Since the layer has such water vapor permeability, vaporizable components such as moisture in the coating layer are diffused and radiated out of the coating layer to prevent swelling and peeling of the coating layer. Becomes possible. Further, the weather resistance of the coating layer is enhanced, and it is possible to exhibit excellent heat insulating performance over a long period of time.
[0078]
The layer (E) in the present invention is formed from an aqueous paint, and preferably contains, for example, (p) a synthetic resin emulsion, (q) an infrared reflective powder and / or an infrared transparent powder. .
[0079]
Examples of the (p) synthetic resin emulsion (hereinafter, referred to as “(p) component”) include, for example, an acrylic resin emulsion, a urethane resin emulsion, an acrylic urethane resin emulsion, a silicone resin emulsion, an acrylic silicone resin emulsion, a fluororesin emulsion, and an epoxy resin emulsion. , A vinyl acetate resin emulsion, a vinyl chloride resin emulsion, a polyvinyl alcohol resin emulsion, an ethylene resin emulsion, and the like, and one or more of these can be used. Such a component (p) may have a crosslinked structure in the resin, or may have a crosslinked structure after forming the coating. With such a crosslinked structure, water vapor permeability, adhesion, weather resistance, water resistance, chemical resistance, and the like can be improved.
[0080]
In the present invention, as the (p) component, the amount of the silicon component in the (p-1) solid content is SiO ₂ A synthetic resin emulsion having a conversion of 0.1 to 50% by weight can be suitably used. When such a component (p-1) is used, the water vapor permeability of the layer (E) and the adhesion between the layer (E) and the layer (D) are improved, and swelling and peeling of the coating layer can be reduced. It is possible to sufficiently prevent it. Further, since the component (p-1) has a property of suppressing the attachment of pollutants derived from exhaust gas or the like, heat storage due to these pollutants can also be prevented. The component (p-1) is obtained by using a reactive silyl group-containing compound as an essential component.
[0081]
As the (p-1) component, for example,
(1) Synthetic resin emulsion containing a reactive silyl group-containing monomer as a monomer component
(2) a synthetic resin emulsion obtained by reacting a silane compound with a resin containing at least one monomer selected from a reactive silyl group-containing monomer, a hydroxyl group-containing monomer, and a carboxyl group-containing monomer as a monomer component;
(3) a synthetic resin emulsion obtained by reacting a functional group in the resin with a silane coupling agent having a functional group capable of reacting with the functional group;
(4) A synthetic resin emulsion obtained by reacting a functional group in a resin with a silane coupling agent having a functional group capable of reacting with the functional group, and further reacting a silane compound. Among them, in the present invention, any one of (2) and (4) is preferable.
[0082]
The reactive silyl group is one in which an alkoxyl group, a phenoxy group, a mercapto group, an amino group, a halogen, or the like is bonded to a silicon atom. In the present invention, an alkoxysilyl group in which an alkoxyl group is bonded to a silicon atom is preferable.
[0083]
The reactive silyl group-containing monomer in (1) and (2) is a compound containing a reactive silyl group and a polymerizable double bond, for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri-n-butoxy. Silane, vinyltris (β-methoxyethoxy) silane, allyltrimethoxysilane, trimethoxysilylethylvinylether, triethoxysilylethylvinylether, trimethoxysilylpropylvinylether, triethoxysilylpropylvinylether, γ- (meth) acryloyloxypropyltrimethoxy Silane, γ- (meth) acryloyloxypropyltriethoxysilane, γ- (meth) acryloyloxypropylmethyldimethoxysilane, vinylmethyldimethoxysilane, methyldimethoxysilylethyl Vinyl ether, are exemplified such methyldimethoxysilylpropyl vinyl ether, may be used one or two or more thereof.
[0084]
Examples of the hydroxyl group-containing monomer in (2) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 2-hydroxyethyl vinyl ether. One or more of these can be used.
Examples of the carboxyl group-containing monomer in (2) include (meth) acrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, maleic anhydride, and itaconic anhydride. The above can be used.
[0085]
As the silane compounds in (2) and (4), those having two or more reactive silyl groups in one molecule are used. For example, tetrafunctional alkoxysilanes such as tetraethoxysilane, tetramethoxysilane and tetrabutoxysilane are used. Classes: methyltrimethoxysilane, methyltriethoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltributoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, butyltriethoxy Trifunctional alkoxysilanes such as silane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltributoxysilane; dimethyldimethoxysilane, dimethyldiethoxysilane, dimethyldibutoxysilane, diethyldisilane Toxysilane, diethyldiethoxysilane, dipropyldimethoxysilane, dipropyldiethoxysilane, dibutyldimethoxysilane, dibutyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, diphenyldibutoxysilane, methylphenyldimethoxysilane, methylphenyldiethoxy Bifunctional alkoxysilanes such as silane; tetrachlorosilane, methyltrichlorosilane, ethyltrichlorosilane, propyltrichlorosilane, phenyltrichlorosilane, vinyltrichlorosilane, dimethyldichlorosilane, diethyldichlorosilane, diphenyldichlorosilane, methylphenyldichlorosilane, etc. Chlorosilanes: tetraacetoxysilane, methyltriacetoxysilane, phenyltriacetoxy Orchids, dimethyldiacetoxysilane, acetoxy silanes such as diphenyl diacetoxy silane and the like, can be used one or two or more thereof. Further, a compound having one reactive silyl group in one molecule can be used in combination. In the present invention, it is particularly desirable to use a trifunctional alkoxysilane and a bifunctional alkoxysilane in combination.
[0086]
Examples of combinations of the functional groups in (3) and (4) include a hydroxyl group and an isocyanate group, an amino group and an isocyanate group, a carboxyl group and an epoxy group, an amino group and an epoxy group, and an alkoxysilyl group. The silane coupling agent is, for example, a compound having at least one or more reactive silyl groups and other substituents in one molecule, and specifically, β- (3,4 epoxycyclohexyl) ethyltrimethoxy Silane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) -γ -Aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, isocyanate-functional silane and the like, and one or more of these can be used.
[0087]
Examples of the comonomer of the component (p-1) include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. (Meth) acrylate monomers such as cyclohexyl (meth) acrylate; amino group-containing monomers such as dimethylaminoethyl (meth) acrylate and dimethylaminopropyl (meth) acrylate; (meth) acrylamide, ethyl (meth) acrylamide and the like An amide group-containing monomer; a nitrile group-containing monomer such as acrylonitrile; an epoxy group-containing monomer such as glycidyl (meth) acrylate; an aromatic vinyl-based monomer such as styrene, methylstyrene, chlorostyrene, and vinyltoluene; Sulfonic acid-containing vinyl monomers such as sulfonic acid and vinyl sulfonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride; chlorine-containing monomers such as vinyl chloride, vinylidene chloride and chloroprene; ethylene glycol monoallyl ether, propylene glycol monoallyl Alkylene glycol monoallyl ethers such as ether and diethylene glycol monoallyl ether; vinyl ester monomers such as vinyl acetate and vinyl propionate; ethylene, propylene, isobutylene and the like can be used. These can be used alone or in combination of two or more. In addition, an ultraviolet absorber containing an ethylenically unsaturated double bond, a light stabilizer containing an ethylenically unsaturated double bond, and the like can also be used.
[0088]
The component (p-1) preferably has a weight average molecular weight of 30,000 or more, more preferably 50,000 or more. When the molecular weight is 30,000 or more, weather resistance, hardness, stain resistance, water resistance, and the like can be improved. The Tg of the component (p-1) is generally -10 to 100C, preferably 0 to 80C. When Tg is lower than -10 ° C, contaminants are easily attached, and the (E) layer easily stores heat. If the temperature is higher than 100 ° C., the layer (E) tends to crack.
[0089]
The amount of the silicon component in the component (p-1) is such that SiO 2 is contained in the solid content of the component (p-1). ₂ The conversion is 0.1 to 50% by weight, preferably 0.5 to 40% by weight, and more preferably 1 to 30% by weight. When the amount of the silicon component is in such a range, a coating layer having sufficient weather resistance is formed. When the amount of the silicon component (p-1) is small, contaminants easily adhere, and the coating layer easily accumulates heat. Also, the weather resistance tends to decrease. If the silicon component is large, there is a possibility that poor adhesion or cracking may occur.
[0090]
Note that SiO ₂ The conversion means that after completely hydrolyzing a compound having a Si-O bond, when the compound is calcined at 900 ° C, silica (SiO 2 ₂ ) And expressed by the remaining weight.
In general, alkoxysilanes, silicates, and the like have a property of reacting with water to cause a hydrolysis reaction to form silanol, and to cause a condensation reaction between silanols or silanol and alkoxy. When this reaction is carried out to the ultimate, silica (SiO ₂ ). These reactions have the general formula
RO (Si (OR) ₂ O) _n R + (n + 1) H ₂ O → nSiO ₂ + (2n + 2) ROH
This is a conversion formula of the amount of the remaining silica component based on this reaction formula.
[0091]
It is desirable that the water-based paint in the present invention contains (q) an infrared-reflective powder and / or an infrared-transparent powder (hereinafter referred to as “component (q)”). By containing such a component (q), it is possible to color the layer (E) to a desired color while suppressing a rise in the temperature of the layer (E) due to sunlight.
[0092]
As the infrared-reflective powder of the component (q), those similar to the component (a) of the infrared-reflective paint can be used. For example, aluminum flake, titanium oxide, barium sulfate, zinc oxide, calcium carbonate , Silicon oxide, magnesium oxide, zirconium oxide, yttrium oxide, indium oxide, alumina and the like. These can be used alone or in combination of two or more.
[0093]
Among the (q) components, examples of the infrared transparent powder include perylene pigments, azo pigments, graphite, red iron oxide, vermilion, titanium red, cadmium red, quinacridone red, isoindolinone, benzimidazolone, phthalocyanine green, Examples include phthalocyanine blue, cobalt blue, indasulene blue, ultramarine, navy blue, and the like, and one or more of these can be used. There is a limit to the hue that can be expressed only by using the infrared reflective powder as the component (q). However, by appropriately combining these infrared transparent powders, it is possible to form coating layers of various hues. It becomes possible.
[0094]
As the infrared transmitting powder, a value obtained by measuring a spectral transmittance for light having a wavelength of 800 to 2100 nm and calculating an average value thereof is 20% or more (preferably 40% or more, more preferably 50% or more). ) Are preferred.
[0095]
The spectral transmittance is a value measured by a spectrophotometer (UV-3100, manufactured by Shimadzu Corporation) in a wavelength range of 800 to 2100 nm.
[0096]
The content of the component (q) is preferably 1 to 40 parts by weight based on 100 parts by weight of the solid content of the component (p). When the component (q) is more than 40 parts by weight, peeling, cracking, and the like may occur.
[0097]
In the water-based paint, in addition to the above-mentioned components, additives that can be generally blended with the paint can be added within a range that does not impair the effects of the present invention. Such additives include, for example, water, solvents, crosslinking agents, catalysts, matting agents, fibers, thickeners, leveling agents, plasticizers, film-forming aids, antifreeze agents, preservatives, antibacterial agents, Examples include an antifungal agent, a dispersant, an antifoaming agent, a pH adjuster, an ultraviolet absorber, and an antioxidant.
[0098]
The layer (E) can be laminated, for example, by applying and forming an aqueous paint.
In the application of the water-based paint, a known coating tool can be used. As the coating device, for example, a spray, a gun, a roller, a brush, and the like can be used. When precoating is performed, a roll coater, a flow coater, or the like can be used. At the time of painting, water can be used to dilute the paint. The amount of water to be mixed may be appropriately set according to the type of coating equipment used.
The dry film thickness of the coating film (D) layer formed by the aqueous paint is usually 5 to 200 μm.
[0099]
【Example】
Examples and comparative examples are shown below to further clarify the features of the present invention.
[0100]
-Manufacture of thick paint-
(Thick paint 1)
30 parts by weight of acrylic resin emulsion (solid content 50%, Tg 0 ° C.), 5 parts by weight of titanium oxide, 20 parts by weight of heavy calcium carbonate, 35 parts by weight of cold water stone / rubber powder, additives (film-forming aid, anti-freezing agent) , A thickener and an antifoaming agent) were mixed to obtain a thick coating material 1.
[0101]
-Production of infrared reflective paint-
(Infrared reflective paint 1)
First, a multilayer structure emulsion 1 was obtained by the following method using the monomer composition ratio of Synthesis Example 1 shown in Table 1.
A reaction vessel was charged with 70 parts by weight of deionized water and 0.2 parts by weight of sodium dodecylbenzenesulfonate, heated to 70 ° C. while stirring and replacing with nitrogen, and added with 0.4 parts by weight of ammonium persulfate. 21.0 parts by weight of styrene and n-butyl acrylate in an aqueous solution prepared by dissolving 0.1 part by weight of sodium dodecylbenzenesulfonate in 20 parts by weight of deionized water were separately prepared. 0 parts by weight and 2.5 parts by weight of glycidyl methacrylate) were continuously added dropwise over 3 hours. After dropping, the mixture was aged for 2 hours, and then 5.0 parts by weight of styrene and 5.0 parts by weight of styrene were dissolved in an aqueous solution obtained by dissolving 0.1 part by weight of sodium dodecylbenzenesulfonate in 10 parts by weight of deionized water. -Butyl acrylate 14.0 parts by weight, methacrylic acid 1.5 parts by weight, and acrylamide 2.0 parts by weight) were continuously added dropwise over 2 hours. After completion of dropping, aging was performed for 2 hours. Next, the pH was adjusted to 7.5 by adding aqueous ammonia, and the mixture was filtered through a 200-mesh wire net to produce a multilayer emulsion.
Next, the infrared-reflective coating material 1 was obtained by mixing hollow particles, infrared-reflective powders, and the like in the multilayer emulsion obtained in Synthesis Example 1 at a ratio shown in Table 2 and uniformly stirring the mixture.
In addition, the spectral reflectance at a dry film thickness of 1 mm of the film formed from the infrared reflective paint 1 was 82%.
[0102]
[Table 1]

[0103]
[Table 2]

[0104]
In addition, the raw materials used for the infrared reflective paint 1 are as follows.
Hollow particles: closed-cell hollow resin beads (acryl-acrylonitrile copolymer resin, average particle diameter 45 μm, density 0.025 g / cm ³ )
・ Infrared reflective powder: titanium oxide (average particle diameter 0.3 μm, spectral reflectance 85%)
・ Film-forming aid: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate
・ Thickener: polycarboxylic acid thickener
・ Antifoaming agent: Silicone antifoaming agent
[0105]
(Infrared reflective paint 2)
An infrared reflective paint 2 was obtained in the same manner as the infrared reflective paint 1 except for the monomer composition ratio of Synthesis Example 2 shown in Table 1 and the raw material composition shown in Table 2.
[0106]
(Infrared reflective paint 3)
First, an emulsion was obtained at the monomer composition ratio of Synthesis Example 3 shown in Table 1 by the following method.
A reaction vessel was charged with 70 parts by weight of deionized water and 0.2 parts by weight of sodium dodecylbenzenesulfonate, heated to 70 ° C. while stirring and replacing with nitrogen, and added with 0.4 parts by weight of ammonium persulfate. Then, 26.5 parts by weight of styrene, 68.5 parts by weight of n-butyl acrylate, and an emulsified monomer separately prepared were dissolved in an aqueous solution obtained by dissolving 0.1 part by weight of sodium dodecylbenzenesulfonate in 20 parts by weight of deionized water. 3.0 parts by weight of methacrylic acid and 2.0 parts by weight of acrylamide emulsified and dispersed) were continuously added dropwise over 3 hours. After completion of dropping, aging was performed for 2 hours. Next, after adjusting the pH to 7.5 by adding aqueous ammonia, the emulsion was produced by filtration through a 200-mesh wire net.
Next, the emulsion obtained in Synthesis Example 3 was mixed with the hollow particles, the infrared-reflective powder, and the like at the ratio shown in Table 2 and uniformly stirred to obtain an infrared-reflective paint 3.
[0107]
(Infrared reflective paint 4)
An infrared reflective paint 4 was produced in the same manner as the infrared reflective paint 2 except for the raw material composition shown in Table 2.
[0108]
(Infrared reflective paint 5)
Except for the raw material composition shown in Table 2, an infrared reflective paint 5 was produced in the same manner as the infrared reflective paint 3.
[0109]
-Production of water-based paint-
(Aqueous paint 1)
20 parts by weight of a mixture of perylene red, benzimidazolone yellow and phthalocyanine blue and 10 parts by weight of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate with respect to 200 parts by weight of the synthetic resin emulsion 1 And 2.5 parts by weight of a urethane-based thickener and 0.5 parts by weight of a silicone-based antifoaming agent to prepare an aqueous paint 1.
[0110]
In addition, the synthetic resin emulsion 1 used for the water-based paint 1 is as follows.
Synthetic resin emulsion 1: Acrylic silicone resin emulsion (Tg 25 ° C., solid content 50% by weight, pH 7, silicon component amount (SiO 2 ₂ (Conversion) 3% by weight, monomer composition: methyl methacrylate, n-butyl acrylate, γ-methacryloyloxypropyltrimethoxysilane, acrylic acid, 2-hydroxyethyl methacrylate, methyltrimethoxysilane, dimethyldimethoxysilane)
[0111]
(Aqueous paint 2)
A water-based paint 2 was obtained in the same manner as the water-based paint 1, except that the synthetic resin emulsion 2 was used instead of the synthetic resin emulsion 1.
[0112]
The synthetic resin emulsion 2 used for the water-based paint 2 is as follows.
Synthetic resin emulsion 2: acrylic silicone resin emulsion (Tg 25 ° C., solid content 50% by weight, pH 8, silicon component amount (SiO 2 ₂ 0.5% by weight, monomer composition: methyl methacrylate, n-butyl acrylate, γ-methacryloyloxypropyltrimethoxysilane, acrylic acid)
[0113]
<Water vapor permeability test>
Water vapor permeability test of infrared reflective paint
A filter paper is placed on a glass plate on which release paper is stuck, and each infrared reflective paint is applied on the filter paper so that a dry film thickness becomes 1.0 mm. (Hereinafter referred to as a standard condition) for one week. After curing, the filter paper to which each infrared reflective paint was applied was peeled off, and the water vapor transmission rate was measured according to JIS K5400 8.17-1990 "water vapor transmission rate". The results are shown in Table 3.
：: Water vapor permeability is 60 g / m ² ・ 24h or more
：: Water vapor permeability is 40 g / m ² ・ 24g or more 60g / m ² ・ Less than 24h
×: 40 g / m ² ・ Less than 24h
[0114]
[Table 3]

[0115]
Water vapor permeability test of water-based paint
A filter paper was placed on a glass plate on which release paper was stuck, and each water-based paint was applied on the filter paper so that the dry film thickness became 50 μm, and curing was performed for one week in a standard state. After curing, the filter paper coated with each red water-based paint was peeled off, and the water vapor permeability was measured according to JIS K5400 8.17-1990 "water vapor permeability". The results are shown in Table 3.
：: Water vapor permeability is 60 g / m ² ・ 24h or more
：: Water vapor permeability is 40 g / m ² ・ 24g or more 60g / m ² ・ Less than 24h
×: 40 g / m ² ・ Less than 24h
[0116]
(Example 1)
A slate plate (12 mm thick) subjected to a sealer treatment was attached to one surface of the phenolic resin foam (25 mm thick), and a 450 × 450 × 450 mm box was prepared so that the slate plate was on the outside. Next, after spraying the thick coating material 1 on the surface of the box with an all-purpose gun in a ball shape, the convex portion of the ball is pressed by a plastic roller with mineral spirit, and the cross section has a trapezoidal unevenness of 4 to 8 mm. Specimen 1 was produced by forming a coating layer (C) of
After preparing the test piece 1, it was set up outdoors in Ibaraki City, Osaka for 3 months, then dust was removed by air blow, washed with water and dried sufficiently, and then the infrared reflective paint 1 was versatile. After spraying with a gun and drying under standard conditions for 8 hours, the water-based paint 1 was spray-coated and cured for 14 days. At this time, the infrared reflective paint 1 was applied such that the dry film thickness was 1 mm, and the aqueous paint 1 was applied such that the dry film thickness was 50 μm.
[0117]
(Coating swelling / peeling test)
After the coating, outdoor exposure was performed in Ibaraki City, Osaka Prefecture, and changes in the surface state of the coating layer after 12 months were visually observed. As a result, there was no swelling or peeling of the coating layer, dirt was not noticeable, and the appearance was excellent.
[0118]
[Table 4]

[0119]
(Example 2)
As shown in Table 4, a swelling / peeling test of the coating layer was performed in the same manner as in Example 1 except that the infrared reflective paint 1 was changed to the infrared reflective paint 2. As a result, there was no swelling or peeling of the coating layer, dirt was not noticeable, and the appearance was excellent.
[0120]
(Example 3)
As shown in Table 4, a swelling / peeling test of the coating layer was performed in the same manner as in Example 1 except that the infrared reflective paint 1 was changed to the infrared reflective paint 3. As a result, there was almost no swelling or peeling of the coating film layer, dirt was not conspicuous, and the appearance was good.
[0121]
(Example 4)
As shown in Table 4, a swelling / peeling test of the coating layer was performed in the same manner as in Example 1, except that the water-based paint 1 was changed to the water-based paint 2. As a result, there was almost no swelling or peeling of the coating film layer, dirt was not conspicuous, and the appearance was good.
[0122]
(Example 5)
As shown in Table 4, a swelling / peeling test of the coating layer was performed in the same manner as in Example 1 except that the water-based paint 1 was not applied. As a result, there was no swelling or peeling of the coating layer, and dirt was hardly conspicuous.
[0123]
(Example 6)
A box of 450 × 450 × 450 mm is prepared using a lightweight mortar plate (25 mm thick) that has been subjected to a sealer treatment. Thick coating material 1 is sprayed on the surface of the box with an all-purpose gun in a ball shape, and then mineral The convex part of the ball was pressed by a plastic roller provided with a spirit to form a coating layer (C) of 4 to 8 mm having a trapezoidal irregularity in cross section, and a test piece 2 was produced.
After preparing the test body 2, it was set up outdoors in Ibaraki City, Osaka for 3 months, then dust was removed by air blow, washed with water and dried sufficiently, and then the infrared reflective paint 1 was used for all purposes. After spraying with a gun and drying under standard conditions for 8 hours, the water-based paint 1 was spray-coated and cured for 14 days. At this time, the infrared reflective paint 1 was applied such that the dry film thickness was 1 mm, and the aqueous paint 1 was applied such that the dry film thickness was 50 μm.
After coating, the coating layer was subjected to a swelling / peeling test. As a result, the swelling and peeling of the coating layer were not observed, the dirt was not conspicuous, and the appearance was excellent.
[0124]
(Comparative Example 1)
As shown in Table 4, a swelling / peeling test of the coating layer was performed in the same manner as in Example 1 except that the infrared reflective paint 1 was changed to the infrared reflective paint 4. As a result, swelling and peeling of the coating layer were observed.
[0125]
(Comparative Example 2)
As shown in Table 4, a swelling / peeling test of the coating layer was performed in the same manner as in Example 1 except that the infrared reflective paint 1 was changed to the infrared reflective paint 5. As a result, swelling and peeling of the coating layer were observed.
[0126]
【The invention's effect】
The heat-insulating structure of the present invention can maintain its aesthetics for a long period of time without swelling, peeling or the like occurring over time.

Claims (4)

A heat insulating structure constituting an outer wall surface of a building, wherein the heat insulating layer (A), the base material layer (B),
A flexible coating layer (C) formed from a thick coating;
A coating layer (D) formed from at least (a) an infrared-reflective powder, (b) a synthetic resin, and (c) an infrared-reflective paint containing hollow particles,
A heat insulating structure, comprising: A heat-insulating structure constituting an outer wall surface of a building, wherein the heat-insulating substrate layer (B ′) extends from the indoor side to the outdoor side of the wall,
A flexible coating layer (C) formed from a thick coating;
A coating layer (D) formed from at least (a) an infrared-reflective powder, (b) a synthetic resin, and (c) an infrared-reflective paint containing hollow particles,
A heat insulating structure, comprising: Insulating structure of claim 1 or claim 2 water vapor transmission rate according to JIS K 5400 8.17-1990 is characterized in that it is 40 g ^/ m 2 · 24h or more coating layers (D). Further, according to the weather side, is formed from an aqueous coating composition, of claims 1 to water vapor permeability according to JIS K 54008.17-1990 is characterized by having a coating layer (E) is 40g ^/ m 2 · 24h or more Item 4. The heat-insulating structure according to any one of items 3.