JP3915360B2 - Method for coating inorganic board and coating composition thereof - Google Patents

Method for coating inorganic board and coating composition thereof Download PDF

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Publication number
JP3915360B2
JP3915360B2 JP2000015084A JP2000015084A JP3915360B2 JP 3915360 B2 JP3915360 B2 JP 3915360B2 JP 2000015084 A JP2000015084 A JP 2000015084A JP 2000015084 A JP2000015084 A JP 2000015084A JP 3915360 B2 JP3915360 B2 JP 3915360B2
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Japan
Prior art keywords
coating
paint
inorganic
glass transition
transition point
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JP2000015084A
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Japanese (ja)
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JP2001206789A (en
Inventor
慎一郎 三木
昌宏 吹擧
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Description

【0001】
【発明の属する技術分野】
この出願の発明は、無機質板の塗装方法とその塗装構成体に関するものである。さらに詳しくは、この出願の発明は、表面に凹凸を有する無機質板を塗装後積載した時に生じるブロッキングを、生産性を低下させることなく、安価に防ぐことのできる無機質板の塗装方法とその塗装構成体に関するものである。
【0002】
【従来の技術】
従来より、建物の外壁材、屋根材等の外装材として、セメント板をはじめとする各種無機質板が用いられている。無機質板は、不燃性であることや、施工の容易さ、表面化粧の多彩さ、および低コストという利点を有するため広く利用されており、表面に柄、目地等の凹凸模様、着色、塗装等の施された多種多様の意匠を有するものが提供されている。最近では、特に、高級感のある外観を付与するために、表面に深い凹凸をもたせ、その上に塗装を施したものが主流となっている。
【0003】
この無機質板は、一般には、セメント、骨材および補強材等から構成される原料スラリーを抄造し、成形、養生、乾燥等の処理を施して得られた基材に、塗装による表面化粧仕上を施して形成される。
【0004】
【発明が解決しようとする課題】
しかしながら、上記のような表面に深い凹凸を有する無機質板は、塗装後に積載すると、積載面が突起部のみで接触するため、基材表面の突起部にのみ荷重が集中し、突起部の塗膜が接触した基材等に接着するブロッキングが発生しやすい。塗膜のブロッキングが発生すると、基材を積載状態から移動させたときに、塗膜は物理的な力をうけ、剥離し、製品としての外観不良をまねくという問題があった。
【0005】
この問題は、塗装工程に塗料の乾燥および焼き付けのために基材に加えられた熱が十分に冷却されず、基材の温度が塗料のガラス転移点以上であるときに顕著に発生する。そのため、塗装工程終了後に、室温付近まで自然または強制冷却するなどの対策が考えられる。
【0006】
しかし、室温付近まで自然冷却させるには長時間を必要とし、生産性の低下が問題視される。また、強制冷却は、短時間で基材を冷却できるが、非常に多くのエネルギーを要するという問題がある。
【0007】
この出願の発明は、以上の通りの事情に鑑みてなされたものであり、表面に凹凸を有する無機質板を塗装後に積載したときに生じるブロッキングを、生産性を低下させることなく、安価に防ぐことのできる無機質板の塗装方法とその塗装構成体を提供することを課題としている。
【0008】
【課題を解決するための手段】
この出願の発明は、上記の課題を解決するものとして、表面に凹凸を有する無機質板の表面全面にガラス転移点が30〜60℃である第1の塗料としての有機塗料を塗装し、次いで積載時に基材等と接触する表面突起部に、ガラス転移点が60〜100℃である第2の塗料としての無機塗料10〜20μmの膜厚で塗装することを特徴とする無機質板の塗装方法を提供する。
【0010】
さらに、この出願の発明は、上記の無機質板の塗装方法で塗装されてなることを特徴とする無機質板塗装構成体も提供する。
【0011】
【発明の実施の形態】
この出願の発明は、上記の通りの特徴を持つものであるが、以下にその実施の形態について説明する。
【0012】
まず、この出願の第1の発明が提供する無機質板の塗装方法は、表面に凹凸を有する無機質板の表面全面にガラス転移点が30〜60℃である第1の塗料としての有機塗料を塗装し、次いで積載時に基材等と接触する表面突起部に、ガラス転移点が60〜100℃である第2の塗料としての無機塗料10〜20μmのの膜厚で塗装する。
【0013】
無機質板は、その組成などに制限はなく、外装材の基材等として広く一般に使用されているものが対象とされる。たとえば、セメント、骨材および補強繊維を主成分とするセメント板等が例示される。また、無機質板表面の凹凸についても、その形状や成形方法に制限はなく、たとえば、溝状、シワ状等の各種凹凸模様を付与するために、プレス成形や注入成形等を利用すること等ができる。
【0014】
このような無機質板の表面全面に、化粧としての第1の塗料が塗装される。第1の塗料は、ガラス転移点が30〜60℃である各種の有機塗料を使用することができる。具体的には、上記範囲内のガラス転移点を有するアクリルエマルジョン塗料等、通常用いられる塗料が使用できる。また、この塗料は1種類または複数種類であってよく、塗装方法についても特に制限はない。たとえば、ガラス転移点が30〜60℃であって、色の異なる複数種の塗料をスプレー等を用いて同時に塗装してもよいし、または、ガラス転移点が30〜60℃の塗料を下塗りし、その上に質感の異なるガラス転移点が30〜60℃の塗料を上塗りして塗装することなどもできる。なお、上記第1の塗料としてガラス転移点が30℃未満の塗料を使用すると、ブロッキングを助長しやすくなり、また、ガラス転移点が60℃を超える塗料を使用すると乾燥性が悪くなり、第2の塗料の塗装に悪影響を及ぼす。
【0015】
次いで、無機質板の表面突起部に、ガラス転移点が60〜100℃である第2の塗料を10〜20μmの膜厚で塗装する。第2の塗料は、ガラス転移点が60〜100℃の各種の無機塗料が使用されるが、このことは、この発明の方法にとって重要である。すなわち、第2の塗料のガラス転移点が60℃未満であると、加熱処理後の冷却が十分でない場合に、基材温度が塗料のガラス転移点よりも高くなることが考えられ、ブロッキングが発生する可能性が生じる。また、ガラス転移点が100℃を超えると、塗膜を乾燥、硬化させるために非常に大きなエネルギーを必要とする上、塗膜の硬化収縮および製造後の基材収縮とによる応力が緩和されにくく、クラックが発生しやすくなるという問題が生じる。その他、第2の塗料の組成などについては特に制限されない。この塗料は、たとえば、着色顔料を含んだエナメルであってもよいし、クリアーであってもよい。前者であれば、突起部のみ色の異なる複雑な表面意匠を得ることができる。
【0016】
塗装方法は、表面突起部のみに塗装すればよく、特に制限はない。表面突起部には、積載時に基材等に接触する部分とその周囲が含まれる。突起部であっても、積載時に基材等と接触しない部分は、塗料を塗装されなくてもよい。表面突起部への塗装は、たとえば、ロールなどを用いる方法で実現される。表面突起部に塗装することで、上記範囲内の比較的ガラス転移点が高い塗膜であっても、硬化収縮時の応力が開放されやすく、クラック発生を防止することができる。さらに、積載時に接触する個所のみを塗装することで、全面塗装することなく経済的にブロッキングを防ぐ効果が得られ、コスト面で有利である。
【0017】
膜厚は、塗膜の乾燥・硬化を促進させる点と、乾燥収縮時の応力を低減させる点から、20μm以下とすることが重要である。膜厚が20μmを超えると、塗膜を乾燥、硬化させるために大きなエネルギーを必要とする上、塗膜の硬化収縮時の応力が大きくなり、クラックが発生しやすくなるという問題が生じる。
【0018】
第2の塗料の塗装後は、必要に応じて、乾燥、60℃程度以下までの冷却等を行ってもよい。
これによって、表面に凹凸を有する無機質セメント板を、塗装後に積載した時に生じるブロッキングを、生産性を低下させることなく、安価に防ぐことができる。
【0019】
また、この出願の発明が提供する無機質板の塗装方法は、上記第1の塗料として有機塗料を使用し、第2の塗料として無機塗料を使用する点に特徴を有する。
【0020】
第1の塗料は、ガラス転移点が30〜60℃の有機塗料であるほかは、特に制限はない。
第2の塗料である無機塗料としては、たとえば、一般式 RnSiX4-nで表される、より具体的には、(C253Si(OC25)等のケイ素アルコキシドを主体とし、硬化触媒を含むものが例示される。この無機塗料は、着色顔料を含むエナメルであってもクリアーであってもよいし、さらに、充填剤、顔料、分散剤、光触媒等の添加剤を含んでいてもよい。
【0021】
ケイ素アルコキシドは、平均組成式RaSi(OH)b(4-a-b)/2として表されるものであってもよい。もしくは、前者との混合物でもよい。なお、後者において、式中、Raは、同一または異なった置換もしくは非置換で炭素数1〜8の1価炭化水素基を表し、aおよびbは、0.2≦a≦2、0.0001≦b≦3およびa+b<4の関係を満たす数である。具体的には、(C25)Si(OH)O等が例示される。
【0022】
硬化触媒についても、一般に用いられているものが利用でき、オクテン酸の金属塩、ナフテン酸の金属塩、又は金属ブトキシドが例示される。
上記のような無機塗料は高温でも軟化しないため、この塗料を突起部に塗装することで、積載時に接触部となる表面突起部が高い硬度を有し、積載時のブロッキングを効果的に防止することができる。
【0023】
これによって、上記の効果を得ることができる。さらに、この出願の発明の無機質板塗装構成体は、上記無機質板の塗装方法により塗装されている。そのため、高級感をもたせる等の目的で表面に深い凹凸を設けた場合でも、積載時の塗膜のブロッキングが発生することがない。
【0024】
すなわち、外観を損ねることも、生産性を低下させることもなく、安価に無機質板塗装構成体が提供される。
以下に実施例を示し、この発明の実施の形態についてさらに詳しく説明する。
【0033】
【実施例】
(実施例)厚さ12mmで、表面に最大深さ4mmの凹凸を有する無機質セメント板に、有機塗料としてガラス転移点が45℃の水系アクリルエマルション塗料を、膜厚が40μmとなるようにスプレーにて全面塗装した。
【0034】
この塗装板の突起部に、無機塗料として、A:(C253Si(OC25)およびB:(C25)Si(OH)Oの50:50(重量比)からなるケイ素アルコキシドコーティング材料を、膜厚が10μmとなるようにロールで塗装した。
【0035】
この塗装板に、150℃のオーブンで1分間の焼き付けを施し、塗装板の温度が50℃となるまで冷却した後、同様の処理を施した塗装板同士を表面と裏面とが接触する形で積載し、積載方向に3kg/cm2の荷重を6時間加え、現実の工程における塗装板の積載状態を再現した。
(実施例)実施例における無機塗料の膜厚を、20μmとした。
(比較例)実施例における無機塗料の膜厚を、30μmとした。
(比較例)実施例における無機塗料を塗装しなかった。
(比較例)実施例における無機塗料を、スプレーにて全面に塗装した。
【0036】
上記実施例および比較例で得られた塗装板の、ブロッキング状態の観察、指触乾燥性、初期および温水風乾燥試験後の塗膜クラックの有無をルーペで観察し、評価した。温風乾燥試験は、得られた塗装板を60℃の温水に8時間浸漬した後、16時間風乾させる操作を、10サイクル行った。
【0037】
また、実施例および比較例の塗装条件と、各種評価結果を表に記した。
【0038】
【表1】

Figure 0003915360
【0039】
実施例およびで得られた塗装板について、ブロッキングは発生しておらず、塗膜の指触乾燥性ならびに耐クラック性は良好であった。
比較例で得られた塗装板は、無機塗料の膜厚を30μmと厚くしすぎたため、塗膜の乾燥が不十分で、塗膜の指触乾燥性がやや悪化していた。また、硬化収縮時の応力が過大となったため、耐クラック性が悪かった。
【0040】
比較例で得られた塗装板は、無機塗料を塗装しなかったため、ガラス転移点の低い有機塗料部で接触することとなり、ブロッキングが発生した。
比較例で得られた塗装板は、無機塗料を全面に塗装したため、塗膜の乾燥が不十分で、塗膜の指触乾燥性が悪化していた。また、硬化収縮時の応力が過大となったため、耐クラック性が悪かった。
【0041】
もちろん、この発明は以上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。
【0042】
【発明の効果】
以上詳しく説明した通り、この発明は、表面に凹凸を有する無機質セメント板を塗装後に積載したときに生じるブロッキングを、生産性を低下させることなく、安価に防ぐことができる。[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to a method for coating an inorganic plate and a coating structure thereof. More specifically, the invention of this application relates to a method for coating an inorganic plate and its coating configuration that can prevent blocking that occurs when an inorganic plate having irregularities on the surface is loaded after coating without reducing productivity. It is about the body.
[0002]
[Prior art]
Conventionally, various inorganic boards including cement boards have been used as exterior materials such as building exterior walls and roofing materials. Inorganic boards are widely used because they have non-flammability, ease of construction, versatility of surface makeup, and low cost. Surfaces have uneven patterns such as patterns and joints, coloring, painting, etc. Those having a wide variety of designs are provided. In recent years, in particular, in order to give a high-class appearance, the mainstream has been provided with deep irregularities on the surface and painted thereon.
[0003]
This inorganic board is generally made from a raw material slurry composed of cement, aggregate, reinforcing material, etc., and subjected to a process such as molding, curing, drying, etc., and then a surface cosmetic finish by painting. Formed.
[0004]
[Problems to be solved by the invention]
However, when the inorganic board having deep irregularities on the surface as described above is loaded after painting, the load surface is contacted only by the protrusions, so the load is concentrated only on the protrusions on the surface of the substrate, and the coating film on the protrusions Blocking that adheres to the base material and the like that are in contact with each other easily occurs. When blocking of the coating film occurs, there is a problem that when the base material is moved from the loaded state, the coating film receives physical force and peels off, resulting in a defective appearance as a product.
[0005]
This problem occurs remarkably when the heat applied to the base material for drying and baking the paint in the coating process is not sufficiently cooled and the temperature of the base material is equal to or higher than the glass transition point of the paint. Therefore, measures such as natural or forced cooling to near room temperature after the completion of the painting process can be considered.
[0006]
However, natural cooling to near room temperature requires a long time, and a reduction in productivity is regarded as a problem. Moreover, forced cooling can cool a base material in a short time, but has the problem that a lot of energy is required.
[0007]
The invention of this application was made in view of the circumstances as described above, and prevents blocking that occurs when an inorganic plate having irregularities on the surface is loaded after coating without reducing productivity. It is an object of the present invention to provide a coating method of an inorganic plate that can be used and a coating structure thereof.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the invention of this application applies an organic paint as a first paint having a glass transition point of 30 to 60 ° C. over the entire surface of an inorganic plate having irregularities on the surface, and then loading Coating an inorganic plate, characterized in that an inorganic paint as a second paint having a glass transition point of 60 to 100 ° C. is applied to a surface protrusion part that is sometimes in contact with a substrate or the like with a film thickness of 10 to 20 μm. Provide a method.
[0010]
Furthermore, the invention of this application also provides an inorganic plate coating structure characterized by being coated by the above-described inorganic plate coating method.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention of this application has the features as described above, and an embodiment thereof will be described below.
[0012]
First, the method for coating an inorganic plate provided by the first invention of this application is to apply an organic paint as a first paint having a glass transition point of 30 to 60 ° C. over the entire surface of an inorganic plate having irregularities on the surface. Then , an inorganic paint as a second paint having a glass transition point of 60 to 100 ° C. is applied to the surface protrusions that come into contact with the substrate or the like when loaded with a film thickness of 10 to 20 μm.
[0013]
There is no restriction | limiting in the composition etc., as for an inorganic board, What is widely used as a base material etc. of an exterior material is made into object. For example, a cement board mainly composed of cement, aggregate, and reinforcing fiber is exemplified. In addition, there are no restrictions on the shape and molding method of the irregularities on the surface of the inorganic plate. For example, in order to provide various irregular patterns such as grooves and wrinkles, it is possible to use press molding or injection molding. it can.
[0014]
A first paint as makeup is applied to the entire surface of such an inorganic plate. First coating material can be glass transition point to use each kind of organic paint Ru 30 to 60 ° C. der. Specifically, a commonly used paint such as an acrylic emulsion paint having a glass transition point within the above range can be used. Moreover, this coating material may be of one type or a plurality of types, and there is no particular limitation on the coating method. For example, a plurality of types of paints having a glass transition point of 30 to 60 ° C. and different colors may be applied at the same time using a spray or the like, or a paint having a glass transition point of 30 to 60 ° C. is primed. Further, it is also possible to apply a paint having a glass transition point of 30 to 60 ° C. having a different texture on it. When a paint having a glass transition point of less than 30 ° C. is used as the first paint, blocking is easily promoted, and when a paint having a glass transition point of more than 60 ° C. is used, the drying property is deteriorated. Adversely affects the painting of paint.
[0015]
Then, the surface projection of the inorganic board, painting the second coating glass transition point of 60 to 100 [° C. with a thickness of. 10 to 20 [mu] m. As the second paint, various inorganic paints having a glass transition point of 60 to 100 ° C. are used, which is important for the method of the present invention. That is, when the glass transition point of the second paint is less than 60 ° C., it is considered that the substrate temperature becomes higher than the glass transition point of the paint when cooling after the heat treatment is insufficient. The possibility to do. In addition, when the glass transition point exceeds 100 ° C., a very large amount of energy is required to dry and cure the coating film, and stress due to the curing shrinkage of the coating film and the shrinkage of the base material after manufacture is difficult to be relaxed. There arises a problem that cracks are likely to occur. In addition, the composition of the second paint is not particularly limited . This paint may be, for example, an enamel containing a color pigment or may be clear. If it is the former, the complicated surface design from which only a projection part differs in color can be obtained.
[0016]
The painting method is not particularly limited as long as it is applied only to the surface protrusions. The surface protrusion includes a portion that contacts the substrate or the like when loaded, and the periphery thereof. Even if it is a protrusion part, the part which does not contact a base material etc. at the time of loading does not need to be painted. The coating on the surface protrusion is realized by a method using a roll or the like, for example. By coating the surface protrusion, even when the coating film has a relatively high glass transition point within the above range, the stress at the time of curing shrinkage can be easily released, and cracking can be prevented. Furthermore, by painting only the portions that come into contact with each other during loading, the effect of preventing blocking can be obtained economically without painting the entire surface, which is advantageous in terms of cost.
[0017]
It is important that the film thickness is 20 μm or less from the viewpoint of promoting drying / curing of the coating film and reducing stress during drying shrinkage. When the film thickness exceeds 20 μm, a large amount of energy is required to dry and cure the coating film, and the stress at the time of curing shrinkage of the coating film increases and cracks tend to occur.
[0018]
After application of the second paint, drying, cooling to about 60 ° C. or lower, and the like may be performed as necessary.
Thus, blocking that occurs when an inorganic cement plate having irregularities on the surface is loaded after coating can be prevented at low cost without reducing productivity.
[0019]
Further, the coating method for the inorganic plate provided by inventions of this application, the use of organic coatings as the upper Symbol first coating material, characterized in that it uses inorganic coating as a second coating.
[0020]
The first paint is not particularly limited except that it is an organic paint having a glass transition point of 30 to 60 ° C.
The inorganic coating is a second coating material, for example, represented by the general formula R n SiX 4-n, and more specifically, (C 2 H 5) 3 Si (OC 2 H 5) silicon alkoxides, such as As a main component, a material containing a curing catalyst is exemplified. This inorganic paint may be enamel containing a colored pigment or clear, and may further contain additives such as fillers, pigments, dispersants, and photocatalysts.
[0021]
The silicon alkoxide may be expressed as an average composition formula R a Si (OH) b O (4-ab) / 2 . Alternatively, a mixture with the former may be used. In the latter, in the formula, R a is 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,. It is a number that satisfies the relationship of 0001 ≦ b ≦ 3 and a + b <4. Specifically, (C 2 H 5 ) Si (OH) O and the like are exemplified.
[0022]
As the curing catalyst, those generally used can be used, and examples thereof include a metal salt of octenoic acid, a metal salt of naphthenic acid, or metal butoxide.
Since the above inorganic coatings do not soften even at high temperatures, the coating of the coating on the projections has a high hardness on the surface projections that become contact portions during loading, and effectively prevents blocking during loading. be able to.
[0023]
Thereby, it is possible to obtain the effect of the above follow. Furthermore, the inorganic plate coating structure of the invention of this application is coated by the above-described inorganic plate coating method. Therefore, even when deep irregularities are provided on the surface for the purpose of giving a high-class feeling, blocking of the coating film during loading does not occur.
[0024]
That is, the inorganic board coating structure is provided at low cost without deteriorating the appearance and reducing the productivity.
Examples will be shown below, and the embodiments of the present invention will be described in more detail.
[0033]
【Example】
(Example 1 ) A water-based acrylic emulsion paint having a glass transition point of 45 ° C. as an organic paint is sprayed on an inorganic cement plate having a thickness of 12 mm and having a maximum depth of 4 mm on the surface so that the film thickness becomes 40 μm. Painted all over.
[0034]
50:50 (weight ratio) of A: (C 2 H 5 ) 3 Si (OC 2 H 5 ) and B: (C 2 H 5 ) Si (OH) O as inorganic coatings on the protrusions of the painted plate The silicon alkoxide coating material consisting of was coated with a roll so that the film thickness was 10 μm.
[0035]
This coated plate is baked in an oven at 150 ° C. for 1 minute, cooled until the temperature of the coated plate reaches 50 ° C., and then the coated plates subjected to the same treatment are in contact with the front and back surfaces. It was loaded and a load of 3 kg / cm 2 was applied in the loading direction for 6 hours to reproduce the loading state of the coated plate in the actual process.
(Example 2 ) The film thickness of the inorganic coating material in Example 1 was 20 μm.
(Comparative example 1 ) The film thickness of the inorganic coating material in Example 1 was set to 30 μm.
(Comparative Example 2 ) The inorganic paint in Example 1 was not applied.
(Comparative Example 3 ) The inorganic paint in Example 1 was applied to the entire surface by spraying.
[0036]
The coating plates obtained in Examples 1 and 2 and Comparative Examples 1 to 3 were observed with a loupe for the observation of the blocking state, the dryness to the touch, and the presence or absence of coating film cracks after the initial and hot water drying test. did. In the hot air drying test, the obtained coated plate was immersed in warm water at 60 ° C. for 8 hours, and then air-dried for 16 hours, 10 cycles were performed.
[0037]
Table 1 shows the coating conditions of Examples 1 and 2 and Comparative Examples 1 to 3 and various evaluation results.
[0038]
[Table 1]
Figure 0003915360
[0039]
About the coating board obtained in Example 1 and 2 , blocking did not generate | occur | produce and the touch-to-touch property and crack resistance of the coating film were favorable.
The coated plate obtained in Comparative Example 1 had an inorganic coating film that was too thick at 30 μm, so that the coating film was not sufficiently dried, and the touch drying property of the coating film was slightly deteriorated. Moreover, since the stress at the time of curing shrinkage was excessive, the crack resistance was poor.
[0040]
Since the coated plate obtained in Comparative Example 2 was not coated with an inorganic paint, it contacted with an organic paint portion having a low glass transition point, and blocking occurred.
Since the coated plate obtained in Comparative Example 3 was coated with an inorganic coating on the entire surface, the coating film was not sufficiently dried, and the dryness to touch of the coating film was deteriorated. Moreover, since the stress at the time of curing shrinkage was excessive, the crack resistance was poor.
[0041]
Of course, the present invention is not limited to the above examples, and it goes without saying that various aspects are possible in detail.
[0042]
【The invention's effect】
As described above in detail, the present invention can prevent the blocking that occurs when an inorganic cement board having irregularities on the surface is loaded after painting without lowering the productivity.

Claims (2)

表面に凹凸を有する無機質板の表面全面にガラス転移点が30〜60℃である第1の塗料としての有機塗料を塗装し、次いで積載時に基材等と接触する表面突起部に、ガラス転移点が60〜100℃である第2の塗料としての無機塗料10〜20μmの膜厚で塗装することを特徴とする無機質板の塗装方法。 An organic paint as the first paint having a glass transition point of 30 to 60 ° C. is applied to the entire surface of the inorganic plate having irregularities on the surface, and the glass transition point is then applied to the surface protrusions that come into contact with the substrate or the like during loading. A method for coating an inorganic board, wherein an inorganic paint as a second paint having a thickness of 60 to 100 ° C. is applied with a film thickness of 10 to 20 μm. 請求項1に記載の方法で塗装されてなることを特徴とする無機質板塗装構成体。An inorganic plate coating structure, which is coated by the method according to claim 1.
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