JP2009287207A - Building material - Google Patents
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- JP2009287207A JP2009287207A JP2008138380A JP2008138380A JP2009287207A JP 2009287207 A JP2009287207 A JP 2009287207A JP 2008138380 A JP2008138380 A JP 2008138380A JP 2008138380 A JP2008138380 A JP 2008138380A JP 2009287207 A JP2009287207 A JP 2009287207A
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Abstract
Description
本発明は、建材に関するものである。特に、耐候性に優れる無機系コーティング剤の硬化被膜層が形成された外廻り建築用の建材に関するものである。 The present invention relates to a building material. In particular, the present invention relates to a building material for exterior construction in which a cured coating layer of an inorganic coating agent having excellent weather resistance is formed.
屋根瓦や外装材等の外廻り建築用の建材においては、窯業系基材や樹脂系基材等の表面に有機塗料が塗布されているが、有機塗料からなる有機塗膜は耐候性や耐腐食性の面で十分な性能が得られないために、一般的にはさらにその上に無機質のコーティング剤が塗布されている（例えば、特許文献１参照）。無機質のコーティング剤を塗布することで、無機質塗膜が形成され、有機塗膜が変退色やチョーキングを起こすことなく初期の外観が維持される。
無機質のコーティング剤を塗布して無機質塗膜を形成するに際しては、有機塗膜と無機質塗膜との層間の密着性が重要であり、その密着性をより長期にわたって維持することが改善点として残されている。特に、比較的接着性が乏しいフッ素樹脂塗膜や金属基材にプレコートされたポリエステル樹脂塗膜等の有機塗膜の上に無機質のコーティング剤を塗布した場合、または既に施工された建材に補修目的で無機質のコーティング剤を塗布した場合には、有機塗膜と無機質塗膜との層間で塗膜剥離が起こることがあり、その密着性の問題が顕著なものになる。 When an inorganic coating agent is applied to form an inorganic coating film, the adhesion between the organic coating film and the inorganic coating film is important, and maintaining the adhesion for a longer period remains as an improvement. Has been. In particular, when an inorganic coating agent is applied on an organic coating film such as a fluororesin coating film with relatively poor adhesion or a polyester resin coating film pre-coated on a metal substrate, or for repairing construction materials that have already been constructed When an inorganic coating agent is applied, peeling of the coating film may occur between the organic coating film and the inorganic coating film, and the problem of adhesion becomes significant.
本発明は、以上のとおりの事情に鑑みてなされたものであり、耐候性に優れるとともに、無機系コーティング剤の硬化被膜層が下地層に対して長期にわたり良好な密着性が維持される建材を提供することを課題としている。 The present invention has been made in view of the circumstances as described above, and is a building material that is excellent in weather resistance and in which a cured coating layer of an inorganic coating agent maintains good adhesion to an underlying layer over a long period of time. The issue is to provide.
本発明は、上記の課題を解決するために、以下のことを特徴としている。 The present invention is characterized by the following in order to solve the above problems.
第１に、本発明の建材は、基材表面に、有機塗料が塗布されて形成される第１硬化被膜層と、さらにその上にエポキシ基含有アクリル樹脂を５〜３０％含む無機系コーティング剤が塗布されて形成される第２硬化被膜層とを順次備えたことを特徴とする。 1stly, the building material of this invention is the inorganic coating agent which contains 5-30% of epoxy resin containing acrylic resin on the 1st cured film layer formed by apply | coating an organic coating material on the base-material surface, and also on it And a second hardened coating layer formed by coating the layers.
第２に、上記第１の建材において、第１硬化被膜層は、ポリエステル樹脂またはフッ素樹脂を含む有機塗料が塗布されて形成されていることを特徴とする。 Second, in the first building material, the first cured coating layer is formed by applying an organic paint containing a polyester resin or a fluororesin.
第３に、上記第１または第２の建材において、無機系コーティング剤は、ケイ素アルコキシドコーティング剤にエポキシ基含有アクリル樹脂が配合されたものであることを特徴とする。 Thirdly, in the first or second building material, the inorganic coating agent is characterized in that an epoxy group-containing acrylic resin is blended with a silicon alkoxide coating agent.
第４に、上記第１から第３のいずれかの建材において、平滑に表面処理された第１硬化被膜層の上に第２硬化被膜層が形成されていることを特徴とする。 Fourth, in any of the first to third building materials, a second cured coating layer is formed on the first cured coating layer that has been subjected to a smooth surface treatment.
上記第１の発明によれば、基材表面に、有機塗料が塗布されて形成される第１硬化被膜層と、さらにその上にエポキシ基含有アクリル樹脂を５〜３０％含む無機系コーティング剤が塗布されて形成される第２硬化被膜層とを順次備えたことにより、耐候性に優れるとともに、従来品よりも無機系コーティング剤の硬化被膜層が下地層に対して高い密着性を有する。よって、第１硬化被膜層と第２硬化被膜層の層間の密着性が長期にわたって維持される。また、初期の外観を損なうことなく、より高い耐候性を有する利点がある。 According to the first aspect of the present invention, there is provided a first cured coating layer formed by applying an organic paint on the surface of the base material, and further an inorganic coating agent containing 5 to 30% of an epoxy group-containing acrylic resin thereon. By sequentially providing the second cured coating layer formed by coating, the weather resistance is excellent, and the cured coating layer of the inorganic coating agent has higher adhesion to the base layer than the conventional product. Therefore, the adhesion between the first cured coating layer and the second cured coating layer is maintained over a long period of time. Moreover, there exists an advantage which has higher weather resistance, without impairing initial appearance.
上記第２の発明によれば、ポリエステル樹脂またはフッ素樹脂を含む有機塗料が塗布されて形成されてなる、比較的接着性が乏しい第１硬化被膜層に対しても長期にわたって高い密着性を実現することができる。 According to the second aspect of the invention, high adhesion is realized over a long period of time even with respect to the first cured coating layer formed by applying an organic paint containing a polyester resin or a fluororesin and having relatively poor adhesion. be able to.
上記第３の発明によれば、無機系コーティング剤は、ケイ素アルコキシドコーティング剤にエポキシ基含有アクリル樹脂が配合されたものであることにより、上記第１および第２の発明の効果をさらに向上させることができる。 According to the third invention, the inorganic coating agent is obtained by blending an epoxy group-containing acrylic resin with a silicon alkoxide coating agent, thereby further improving the effects of the first and second inventions. Can do.
上記第４の発明によれば、平滑に表面処理された第１硬化被膜層の上に第２硬化被膜層が形成されていることにより、第１硬化被膜層と第２硬化被膜層の層間の密着性をより向上させ、さらに耐候性を高めることができる。 According to the fourth aspect of the invention, the second cured coating layer is formed on the first cured coating layer that has been subjected to a smooth surface treatment, so that the gap between the first cured coating layer and the second cured coating layer is reduced. Adhesion can be further improved and weather resistance can be further improved.
本発明は前記のとおりの特徴をもつものであるが、以下に、本発明を実施するための最良の形態を説明する。 The present invention has the features as described above. The best mode for carrying out the present invention will be described below.
本発明に使用される基材は、特に限定されるものではなく、例えば、窯業系、プラスチック系、金属系、木質系、ガラス等、各種の素材を挙げることができる。これにより、特に外廻り建築用の建材として幅広く使用することができる。これら基材はその素材に適した前処理を施すことで、後述する第１硬化被膜層の密着性を向上させることができる。このような前処理の具体例として、脱脂処理、洗浄処理、ブラスト処理、プラズマ処理、プライマー処理等が挙げられる。金属系基材の場合には、化学研摩やクロメート処理も有効である。 The base material used for this invention is not specifically limited, For example, various raw materials, such as ceramics type | system | group, a plastic type | system | group, a metal type | system | group, a wood type | system | group, glass, can be mentioned. Thereby, it can be widely used especially as a building material for exterior construction. These base materials can improve the adhesiveness of the 1st cured film layer mentioned later by performing the pretreatment suitable for the raw material. Specific examples of such pretreatment include degreasing treatment, cleaning treatment, blast treatment, plasma treatment, and primer treatment. In the case of a metal base material, chemical polishing and chromate treatment are also effective.
本発明においては、上記基材の表面に、溶剤系、エマルジョン系等の有機塗料が塗布され、これが硬化して第１硬化被膜層が形成される。この有機塗料は、一般的に建築用建材の塗料として使用されるものであり、例えば、アクリル樹脂、ウレタン樹脂、ポリエステル樹脂あるいはフッ素樹脂のいずれかの樹脂、またはこれら２種以上の樹脂を組み合わせた樹脂を含む塗料である。有機塗料中のフッ素樹脂成分比率が高い塗料は基材との密着性が低下する場合があるので、フッ素樹脂とともにアクリル樹脂等を組み合わせた有機塗料を使用することが望ましい。このような有機塗料は基材の化粧として用いられる場合も多く、顔料を分散させてエナメル化させた塗料が使用されてもよい。また、顔料の種類のみを変えた色違いの塗料を準備し、これらを意匠表現向上の目的で何層にも塗り重ねてもよい。これによって得られた複数層積層した硬化被膜についても、本発明においては、すべて第１硬化被膜層として含むものである。 In the present invention, a solvent-based, emulsion-based or other organic coating is applied to the surface of the substrate, and this is cured to form a first cured coating layer. This organic paint is generally used as a paint for building materials for construction. For example, an acrylic resin, a urethane resin, a polyester resin or a fluororesin, or a combination of two or more of these resins It is a paint containing a resin. Since a paint having a high fluorine resin component ratio in the organic paint may have a reduced adhesion to the substrate, it is desirable to use an organic paint in which an acrylic resin or the like is combined with the fluororesin. Such organic paints are often used as makeup for base materials, and paints in which pigments are dispersed and enameled may be used. In addition, paints of different colors in which only the type of pigment is changed may be prepared, and these may be applied in layers for the purpose of improving design expression. In the present invention, the cured film obtained by laminating a plurality of layers is all included as the first cured film layer.
有機塗料を塗布する方法としては、刷毛塗り、スプレーコート、浸漬（ディッピングまたはディップコートともいう）、ロールコート、フローコート、カーテンコート、ナイフコート、スピンコート、バーコート等、通常の各種塗布方法を選択することができる。また有機塗料を硬化させる方法や硬化の際の温度も特に限定されず、公知の方法によって硬化被膜を形成させる。 The organic paint can be applied by various ordinary application methods such as brush coating, spray coating, dipping (also called dipping or dip coating), roll coating, flow coating, curtain coating, knife coating, spin coating, bar coating, and the like. You can choose. Further, the method for curing the organic paint and the temperature at the time of curing are not particularly limited, and a cured film is formed by a known method.
本発明では、上記第１硬化被膜層の上に、さらに第２硬化被膜層が形成される。この第２硬化被膜層は、エポキシ基含有アクリル樹脂を５〜３０％含む無機系コーティング剤が塗布されて形成されるものである。 In the present invention, a second cured coating layer is further formed on the first cured coating layer. The second cured coating layer is formed by applying an inorganic coating agent containing 5 to 30% of an epoxy group-containing acrylic resin.
ここで無機系コーティング剤としては、例えば、ケイ酸塩、リン酸塩、シリカゾルやアルカリシリケート等の水溶性シリケート、アルミナゾル等の架橋により硬化するもの、ソルダーガラス等の溶融物の冷却により硬化するもの、アルキルシリケート、アルキルチタネート等の有機側鎖の消失により硬化するもの、金属アルコラートを主成分とする常温もしくは低温加熱により硬化するもの等が例示される。より具体的なものとして、本出願人がすでに提案している特開２００２−１８７２３０号公報記載のものが挙げられる。例えば、一般式が、
（Ｒ１）ｎＳｉＸ４−ｎ
（式中、Ｒ１は各々置換もしくは非置換の炭素数１〜８の１価の炭化水素基を表し、Ｘは加水分解性基を表す。ｎは０〜３の整数である。）で表される加水分解性オルガノシランを、有機溶媒と水のうち少なくとも一方に分散されたコロイド状シリカ中で、Ｘ１モルに対し０．００１〜０．５モルを使用する条件下で部分加水分解して得られるオルガノシランのシリカ分散オリゴマー溶液（Ａ成分）と、平均組成式が
（Ｒ２）ａＳｉ（ＯＨ）ｂＯ（４−ａ−ｂ）／２
（式中、Ｒ２は各々同一又は異種の置換もしくは非置換の炭素数１〜８の１価の炭化水素基を表し、ａおよびｂはそれぞれ０．２≦ａ≦２．０、０．０００１≦ｂ≦３、ａ＋ｂ＜４の関係を満たす数である。）で表される、分子中にシラノール基を含有するポリオルガノシロキサン（Ｂ成分）と、シランカップリング剤（Ｃ成分）とを、必須成分として含有するケイ素アルコキシドコーティング剤を挙げることができる。
Here, as the inorganic coating agent, for example, silicate, phosphate, water-soluble silicates such as silica sol and alkali silicate, those cured by cross-linking of alumina sol, and those cured by cooling a melt such as solder glass Examples thereof include those cured by disappearance of organic side chains such as alkyl silicate and alkyl titanate, and those cured by normal temperature or low temperature heating mainly composed of metal alcoholate. More specific examples include those described in Japanese Patent Application Laid-Open No. 2002-187230 which has already been proposed by the present applicant. For example, the general formula is
(R 1 ) n SiX 4-n
(Wherein R 1 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, X represents a hydrolyzable group, and n is an integer of 0 to 3). The hydrolyzable organosilane is partially hydrolyzed in a colloidal silica dispersed in at least one of an organic solvent and water under the condition of using 0.001 to 0.5 mol per X1 mol. The resulting silica dispersion oligomer solution of organosilane (component A) and the average composition formula
(R 2 ) a Si (OH) b O (4-ab) / 2
(In the formula, each R 2 represents the same or different substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, and a and b are 0.2 ≦ a ≦ 2.0 and 0.0001, respectively. ≦ b ≦ 3, a number satisfying the relationship of a + b <4)), a polyorganosiloxane containing a silanol group in the molecule (component B) and a silane coupling agent (component C). The silicon alkoxide coating agent contained as an essential component can be mentioned.
エポキシ基含有アクリル樹脂は、１分子中にエポキシ基を含有するアクリル樹脂であり、アクリル鎖の一部にエポキシ基を有する。このものはエポキシ基含有ビニルモノマーをアクリル酸またはメタクリル酸の誘導体と共重合することにより容易に得られる。エポキシ基含有ビニルモノマーは、例えば、グリシジル（メタ）アクリレート、アリルグリシジルエーテル、ジグリシジルマレート等が挙げられる。アクリル酸またはメタクリル酸の誘導体としては、例えば、メチル（メタ）アクリレート、エチル（メタ）アクリレート、ブチル（メタ）アクリレート、シクロヘキシル（メタ）アクリレート等が挙げられる。エポキシ基含有アクリル樹脂には、エポキシ基と共に、ケイ素アルコキシ基を有すると好ましい。この場合、エポキシ基含有アクリル樹脂とポリオルガノシロキサンの反応性が高まり、密着性がより高くなる。 The epoxy group-containing acrylic resin is an acrylic resin containing an epoxy group in one molecule, and has an epoxy group in a part of the acrylic chain. This can be easily obtained by copolymerizing an epoxy group-containing vinyl monomer with a derivative of acrylic acid or methacrylic acid. Examples of the epoxy group-containing vinyl monomer include glycidyl (meth) acrylate, allyl glycidyl ether, and diglycidyl malate. Examples of the acrylic acid or methacrylic acid derivative include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like. The epoxy group-containing acrylic resin preferably has a silicon alkoxy group together with the epoxy group. In this case, the reactivity between the epoxy group-containing acrylic resin and the polyorganosiloxane is increased, and the adhesion is further increased.
エポキシ基含有アクリル樹脂の重量平均分子量は、第２硬化被膜層の耐久性等の観点から２００〜１５０００、なかでも５００〜１３０００、とくには１０００〜１００００であることが好ましい。重量平均分子量が２００未満の場合は、コーティング剤の保存安定性が低下しやすくなり、重量平均分子量が１５０００を越える場合は、密着性が多少低下する場合がある。また、アクリル樹脂におけるエポキシ基の含有量は、アクリル樹脂が十分に架橋して第１硬化被膜層と効果的に密着し得るだけのエポキシ基を有することが好ましく、例えば、第２硬化被膜層の硬化性およびその強度、第１硬化被膜層との密着性等の観点からエポキシ基含有アクリル樹脂のエポキシ当量を１００〜２００００の範囲、より好ましくは２００〜１００００の範囲とすることができる。 The weight average molecular weight of the epoxy group-containing acrylic resin is preferably 200 to 15000, more preferably 500 to 13,000, and particularly preferably 1000 to 10,000 from the viewpoint of durability of the second cured coating layer. When the weight average molecular weight is less than 200, the storage stability of the coating agent tends to be lowered, and when the weight average molecular weight exceeds 15,000, the adhesion may be somewhat lowered. In addition, the content of the epoxy group in the acrylic resin preferably has an epoxy group that can sufficiently cross-link the acrylic resin and effectively adhere to the first cured coating layer. The epoxy equivalent of the epoxy group-containing acrylic resin can be set in the range of 100 to 20000, more preferably in the range of 200 to 10,000 from the viewpoints of curability and its strength, adhesion to the first cured coating layer, and the like.
このようなエポキシ基含有アクリル樹脂は、第２硬化被膜層を形成する無機系コーティング剤の樹脂固形分中、重量比で５〜３０％の範囲になるように配合される。これにより、第１硬化被膜層と第２硬化被膜層との層間の密着性が長期にわたり良好に維持される。エポキシ基含有アクリル樹脂が５％より少ないと所望の密着性が得られない場合があり、３０％を超える場合には外廻り建築用として使用した場合に紫外線劣化を受けて塗膜劣化を引き起こす場合がある。 Such an epoxy group-containing acrylic resin is blended so as to be in the range of 5 to 30% by weight in the resin solid content of the inorganic coating agent forming the second cured coating layer. Thereby, the adhesiveness between the layers of the first cured coating layer and the second cured coating layer is well maintained over a long period of time. If the epoxy group-containing acrylic resin is less than 5%, the desired adhesion may not be obtained. If it exceeds 30%, the coating will deteriorate due to UV degradation when used for exterior construction. There is.
このようにして得られた無機系コーティング剤は、第１硬化被膜層として、とくに密着性を確保しにくいフッ素樹脂の硬化被膜や金属系基材にプレコートされたポリエステル樹脂の硬化被膜に対しても良好な密着性を得ることができる。また、この無機系コーティング剤は、第１硬化被膜層の表面を所定の粗さに粗面化したり昜接着処理したりするなどの処理を施すことなく良好な密着性を得ることができるが、より耐候性を向上させたい場合には、第１硬化被膜層の表面をサンドペーパー等で研摩して平滑な状態とした後、前記無機系コーティング剤を塗布するようにしてもよい。 The inorganic coating agent thus obtained can be used as a first cured film layer, particularly for a cured film of a fluororesin that is difficult to ensure adhesion and a cured film of a polyester resin precoated on a metal substrate. Good adhesion can be obtained. In addition, this inorganic coating agent can obtain good adhesion without performing a treatment such as roughening the surface of the first cured coating layer to a predetermined roughness or performing a tack adhesion treatment, In order to improve the weather resistance, the inorganic coating agent may be applied after the surface of the first cured coating layer is polished with sandpaper or the like to make it smooth.
無機系コーティング剤を塗布する方法としては、上記有機塗料の塗布方法と同様、刷毛塗り、スプレーコート、浸漬、ロールコート、フローコート、カーテンコート、ナイフコート、スピンコート、バーコート等、通常の各種塗布方法を選択することができ、常法によって硬化被膜を形成させる。 As a method of applying the inorganic coating agent, as in the case of the organic coating method described above, brush coating, spray coating, dipping, roll coating, flow coating, curtain coating, knife coating, spin coating, bar coating, etc. A coating method can be selected, and a cured film is formed by a conventional method.
以下、実施例を示し、この発明の実施の形態についてさらに詳しく説明する。もちろん、この発明は以下の例に限定されるものではなく、細部については様々な態様が可能であることは言うまでもない。 Hereinafter, examples will be shown, and the embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail.
＜実施例１＞
化成処理したアルミニウム製基材の表面に、第１硬化被膜層として「ディップフロー」（日本ファインコーティング製（フッ素樹脂成分５０質量％、アクリル樹脂成分５０質量％）を塗布し、これを乾燥硬化させて厚み１０μｍの硬化被膜を形成した。その後、この硬化被膜を＃２００のサンドペーパーでその表層を削り取り、削り粉をきれいに除去して塗装板を作製した。
<Example 1>
“Dip Flow” (made by Nippon Fine Coating (Fluorine resin component 50 mass%, acrylic resin component 50 mass%) as a first cured coating layer is applied to the surface of the aluminum base material subjected to chemical conversion treatment and dried and cured. Then, a cured film having a thickness of 10 μm was formed, and then the surface layer of this cured film was scraped off with # 200 sandpaper, and the shavings were removed to prepare a coated plate.
次に、メタノール分散コロイダルシリカゾルＭＴ−ＳＴ（日産化学工業製）１００質量部、メチルトリメトキシシラン６８質量部、水１０．８質量部を投入し、攪拌しながら６５℃の温度で約５時間かけて部分加水分解反応を行って得たシリカ分散オリゴマー溶液（Ａ成分）と、メチルトリイソプロポキシシラン２２０質量部（１モル）とトルエン１５０質量部との混合液を計りとり、この混合液に１％塩酸水溶液１０８質量部を滴下して、メチルトリイソプロポキシシランを加水分解した後、反応液を分液ロートに移し入れて静置し、二層に分離した下層の、少量の塩酸を含む水とイソプロピルアルコールとの混合液を分液して除去し、トルエンを減圧留去した後、残留物をイソプロピルアルコールで希釈することにより得たポリオルガノシロキサン（Ｂ成分）と、Ｎ−（β−アミノエチル）−γ−アミノプロピルメチルジメトキシシランのシランカップリング剤（Ｃ成分）とを、それぞれ５０：５０：1の比率で混合した後に、重量平均分子量１０００のケイ素アルコキシ基を有するエポキシ基含有アクリル樹脂（大日本インキ化学工業製）を配合して得た無機系コーティング剤を、作製した塗装板に対して、スプレー塗装で硬化被膜厚で約５μｍになるように塗布し、硬化温度８０℃で５分間硬化させて第２硬化被膜層を形成して建材を得た。なお、エポキシ基含有アクリル樹脂は、無機系コーティング剤の樹脂固形分中、重量比で１０％になるように配合した。
＜実施例２＞
第１硬化被膜層の表面にサンドペーパー処理を施さなかった以外は、実施例１と同様にして建材を得た。
＜実施例３＞
エポキシ基含有アクリル樹脂が２５質量％になるように配合した無機系コーティング剤を用いた以外は、実施例２と同様にして建材を得た。
＜実施例４＞
基材としてスレート板、第１硬化被膜層としてアクリル樹脂塗料ＩＭ４１００（関西ペイント製）を使用した以外は、実施例２と同様にして建材を得た。
＜実施例５＞
重量平均分子量１００００のケイ素アルコキシ基を有するエポキシ基含有アクリル樹脂を使用した以外は、実施例２と同様にして建材を得た。
＜比較例１＞
エポキシ基含有アクリル樹脂を配合しない無機系コーティング剤を使用した以外は、実施例２と同様にして建材を得た。
＜比較例２＞
エポキシ基含有アクリル樹脂が重量比で３％になるように配合した無機系コーティング剤を使用した以外は、実施例２と同様にして建材を得た。
＜比較例３＞
エポキシ基含有アクリル樹脂が重量比で４０％になるように配合した無機系コーティング剤を使用した以外は、実施例２と同様にして建材を得た。
Next, 100 parts by mass of methanol-dispersed colloidal silica sol MT-ST (manufactured by Nissan Chemical Industries), 68 parts by mass of methyltrimethoxysilane, and 10.8 parts by mass of water are added and stirred at a temperature of 65 ° C. for about 5 hours. A mixed solution of silica dispersion oligomer solution (component A) obtained by performing partial hydrolysis reaction, 220 parts by mass of methyltriisopropoxysilane (1 mol) and 150 parts by mass of toluene was weighed. After dropwise addition of 108 parts by weight of aqueous hydrochloric acid to hydrolyze methyltriisopropoxysilane, the reaction solution was transferred to a separatory funnel and allowed to stand to separate the lower layer of water containing a small amount of hydrochloric acid. A liquid mixture of isopropyl alcohol and isopropyl alcohol was removed by separation, and toluene was distilled off under reduced pressure. The residue was diluted with isopropyl alcohol to obtain a polyorgano After mixing the oxane (component B) and the silane coupling agent (component C) of N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane in a ratio of 50: 50: 1, respectively, the weight average An inorganic coating agent obtained by blending an epoxy group-containing acrylic resin (made by Dainippon Ink & Chemicals, Inc.) having a silicon alkoxy group with a molecular weight of 1000 is about 5 μm in terms of cured film thickness by spray coating on the prepared plate. And then cured at a curing temperature of 80 ° C. for 5 minutes to form a second cured coating layer to obtain a building material. The epoxy group-containing acrylic resin was blended so as to be 10% by weight in the resin solid content of the inorganic coating agent.
<Example 2>
A building material was obtained in the same manner as in Example 1 except that the surface of the first cured coating layer was not subjected to sandpaper treatment.
<Example 3>
A building material was obtained in the same manner as in Example 2 except that an inorganic coating agent blended so that the epoxy group-containing acrylic resin was 25% by mass was used.
<Example 4>
A building material was obtained in the same manner as in Example 2 except that a slate plate was used as the substrate and an acrylic resin paint IM4100 (manufactured by Kansai Paint) was used as the first cured coating layer.
<Example 5>
A building material was obtained in the same manner as in Example 2 except that an epoxy group-containing acrylic resin having a silicon alkoxy group having a weight average molecular weight of 10,000 was used.
<Comparative Example 1>
A building material was obtained in the same manner as in Example 2 except that an inorganic coating agent containing no epoxy group-containing acrylic resin was used.
<Comparative Example 2>
A building material was obtained in the same manner as in Example 2 except that an inorganic coating agent blended so that the epoxy group-containing acrylic resin was 3% by weight was used.
<Comparative Example 3>
A building material was obtained in the same manner as in Example 2 except that an inorganic coating agent blended so that the epoxy group-containing acrylic resin was 40% by weight was used.
上記実施例１〜５および比較例１〜３で得られた建材について、外観を目視で観察した。また、第１硬化被膜層と第２硬化被膜層との層間の密着性を評価するために、温水６０℃に８時間浸漬後１６時間室温乾燥する処理を１サイクルとし、１０サイクル後の密着性を碁盤目試験（ＪＩＳ Ｋ５４００碁盤目試験方法に準ずる）で評価した。さらに、耐候性を評価するために、岩崎電気（株）製の「アイスーパーＵＶテスターＳＵＶ Ｗ２３１」（５００時間照射で１０年促進）にて促進試験を行い、試験前後の色差（ΔＥ）を評価した。 About the building material obtained in the said Examples 1-5 and Comparative Examples 1-3, the external appearance was observed visually. In addition, in order to evaluate the adhesion between the first cured coating layer and the second cured coating layer, the treatment after being immersed in warm water 60 ° C. for 8 hours and then dried at room temperature for 16 hours is defined as 1 cycle, and the adhesion after 10 cycles. Was evaluated by a cross-cut test (according to the JIS K5400 cross-cut test method). Furthermore, in order to evaluate the weather resistance, an acceleration test was conducted with “I Super UV Tester SUV W231” (promoted by irradiation for 500 hours for 10 years) to evaluate the color difference (ΔE) before and after the test. did.
結果を表１に示す。 The results are shown in Table 1.
表１にみられるように、エポキシ基含有アクリル樹脂を５〜３０％含む無機系コーティング剤を塗布して第２硬化被膜層を形成した建材（実施例１〜５）はいずれも外観に問題はないことが確認できた。また、碁盤目試験の結果が１００／１００と密着性が良好であり、耐候性についてもΔＥが小さく良好であることが確認できた。 As can be seen in Table 1, all the building materials (Examples 1 to 5) in which an inorganic coating agent containing 5 to 30% of an epoxy group-containing acrylic resin was applied to form a second cured film layer had a problem in appearance. It was confirmed that there was no. Moreover, it was confirmed that the cross-cut test result was 100/100 and the adhesion was good, and the weather resistance was small and good ΔE.
他方、エポキシ基含有アクリル樹脂を配合しない無機系コーティング剤を使用した建材（比較例１）やエポキシ基含有アクリル樹脂が重量比で３％になるように配合した無機系コーティング剤を使用した建材（比較例２）は、碁盤目試験の結果がそれぞれ４０／１００、５３／１００であり、密着性が劣ることが確認できた。また、エポキシ基含有アクリル樹脂が重量比で４０％になるように配合した無機系コーティング剤を使用した建材（比較例３）は、耐候性の評価においてΔＥが大きくなり、耐候性が劣ることが確認できた。 On the other hand, building materials using an inorganic coating agent that does not contain an epoxy group-containing acrylic resin (Comparative Example 1) and building materials that use an inorganic coating agent compounded so that the epoxy group-containing acrylic resin is 3% by weight ( In Comparative Example 2), the results of the cross-cut test were 40/100 and 53/100, respectively, and it was confirmed that the adhesion was inferior. In addition, the building material (Comparative Example 3) using the inorganic coating agent that is blended so that the epoxy group-containing acrylic resin is 40% by weight may have a large ΔE in the weather resistance evaluation, and the weather resistance may be inferior. It could be confirmed.
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| JPH03242268A (en) * | 1989-11-02 | 1991-10-29 | Matsushita Electric Works Ltd | Method for repairing surface of inorganic hardened body |
| JPH10140086A (en) * | 1996-11-13 | 1998-05-26 | Matsushita Electric Works Ltd | Inorganic coating material composition and coated product using the same |
| JPH11152446A (en) * | 1997-11-25 | 1999-06-08 | Matsushita Electric Works Ltd | Resin composition for coating reduced in adhesiveness coated product using the same, and their uses |
| JP2000239608A (en) * | 1999-02-23 | 2000-09-05 | Matsushita Electric Works Ltd | Resin composition for coating material and article coated therewith |
| JP2002097086A (en) * | 2000-09-25 | 2002-04-02 | Matsushita Electric Works Ltd | Inorganically coated product |
| JP2004202328A (en) * | 2002-12-24 | 2004-07-22 | Matsushita Electric Works Ltd | Coated article having weatherable silicone resin coating film and its production method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03242268A (en) * | 1989-11-02 | 1991-10-29 | Matsushita Electric Works Ltd | Method for repairing surface of inorganic hardened body |
| JPH10140086A (en) * | 1996-11-13 | 1998-05-26 | Matsushita Electric Works Ltd | Inorganic coating material composition and coated product using the same |
| JPH11152446A (en) * | 1997-11-25 | 1999-06-08 | Matsushita Electric Works Ltd | Resin composition for coating reduced in adhesiveness coated product using the same, and their uses |
| JP2000239608A (en) * | 1999-02-23 | 2000-09-05 | Matsushita Electric Works Ltd | Resin composition for coating material and article coated therewith |
| JP2002097086A (en) * | 2000-09-25 | 2002-04-02 | Matsushita Electric Works Ltd | Inorganically coated product |
| JP2004202328A (en) * | 2002-12-24 | 2004-07-22 | Matsushita Electric Works Ltd | Coated article having weatherable silicone resin coating film and its production method |
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