About paint (1)

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Types of architectural paint

There are various types of paints depending on their purpose.

When choosing a paint, consider the situation in which it will be used, budget, safety, and so on, and select a paint that has characteristics that match those.

Acrylic paint

Since the price is relatively low, it is a paint that has been used widely in the past. Nowadays, the price of other high-grade paints has also fallen, so the number of cases used in architectural paints has decreased.

Service life: 5-8 years

 

Urethane paint

Urethane paint is a widely used paint because it is soft and has few cracks as a construction material and is easy to handle. Discoloration tends to occur more easily than silicone paint.

Service life: 7-10 years

 

Silicone paint

Since it has a long service life and its price has not changed from that of urethane paint, it is currently the most used paint on the market. Since it has the property of keeping dirt away, it is often used for repainting general buildings and detached houses.

Service life: 10-15 years

 

Epoxy paint

It is a paint with excellent adhesion and chemical resistance. Since the coating film is extremely hard, it is used as an undercoat paint to improve the adhesion to the substrate. However, it has little weather resistance to ultraviolet rays and easily turns yellow, so it is not suitable for locations exposed to light such as walls.

 

Fluorine paint

It is a highly durable paint with various functions. Since it is expensive, it is rarely used for general construction, but it is used for bridges such as Tokyo Gate Bridge and high-rise buildings such as Tokyo Skytree.

Service life: 15-20 years

 

Water-based paint

It is a paint that can be diluted with water without using thinner. By not using thinner, it will lead to a great deal of environmental measures such as VOC* reduction. Since it can be diluted with water, it has the advantage of being easier to use than solvents in terms of not only the environment but also the cost. And the use of water-based paints for exterior walls and interiors of general buildings is progressing. The service life is shorter than that of solvent-based paints.

 

Weak solvent paint

It is a paint that can be diluted with paint thinner. Lacquer thinner and epoxy thinner are called “strong solvents”, but weak solvent paints, whose ingredients are similar to kerosene, are environmentally friendly. Also, if a strong solvent-based paint is applied over a weak solvent paint, the strong solvent-based paint will dissolve the weak solvent paint, so you should be careful. On the other hand, when applying a weak solvent paint on top, it is generally said that it is easy to handle because it is difficult to dissolve the paint applied previously. It is often used for iron parts of general construction.

 

*a volatile organic solvent

 

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Comments for this article

  • べべ より:

    弱溶剤とか強溶剤の「弱」とか「強」って何を意味しているんですか?
    溶剤の強さだとしたら、弱い溶剤の存在意義がわかりません。

    • sankyo管理者 より:

      >>べべ様

      コメントありがとうございます。
      仰る通り、溶剤の溶解力の強さを言っています。
      弱溶剤の代表的な溶剤は「塗料用シンナー」と呼ばれるペンキによく使われるもので、
      強溶剤の代表的な溶剤は「ラッカーシンナー」と呼ばれるラッカー塗料によく使われるものがあります。
      何故強弱共に存在しているかというと、もしべべ様が女性の方なら経験がおありになるかもしれませんが、
      マニキュアを塗る際、ベースコートを塗って、色のついたマニキュアを塗り、そのあとトップコートを塗ります。
      しっかりマニキュアが乾いていても、トップコートが強いと、乾いたマニキュアを溶かして色落ち、色ムラの原因となってしまいます。
      下に塗った塗料の層を乱さずに、上に塗料を載せたり、
      あるいは下の層を侵さずに上の層だけ塗料を落としたいとき、弱溶剤は活躍します。

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