In: Mechanical Engineering
is polyurethane coating considered and organic
coating? explain.
Solution:
Yes, polyurethene coatings are considered as organic coatings.
According to the nature of the binders coatings are classified as organic or inorganic coatings.
Organic Coatings:
Organic Coatings are powder paints or liquids that require several layers before a thick enough coating is achieved to inhibit corrosion. Coating should be durable and dense.
These coatings are based on carbon containing materials normally derived from refined or modified petroleum products, as well as different solvents like water, pigments, additives, and fillers.
Inorganic Coatings:
Inorganic coatings encompass surface conversion, anodizing, enamelling, metallic coatings and more.
These coatings are created through a chemical action which changes the surface layer of metal into a metallic oxide film.
Why Polyurethene coatings considered as organic coatings?
Organic coatings improve the metal surface protection by acting as a barrier to protect the underlying substrate.
Same way a polyurethane coating is the layer of polyurethane which is applied to a material's surface in order to protect it.
A polyurethane coating can protect the base material from corrosion, weathering, abrasion and other processes that would degrade the quality of the material over time.
A polyurethane coating can be glossy or muted, and can be opaque or transparent.
It can be enhanced with specialty additives.
Polyurethane coating products are characterized by exceptional resistance to corrosion, abrasion, chemicals and weathering processes.
Because of this versatility, you will find polyurethane used as a primer, intermediate coat or a topcoat depending on the needs of the application.
Polyurethane coatings are polymers. They are very hard and strong, providing exceptional wear resistance. Contrary they can also be more soft and ductile, so that the base material is allowed to stretch without destroying the coating. They are not flammable, so they can be used for situations where combustion is occurring in the same environment.
Polyurethane coatings are notable for their ability to adhere(adhesion) very well to a wide variety of base materials. Many polyurethane coatings require no additional processing to cure. Many polyurethane coatings have very fast setting times, and that can be applied and set for a broad range of temperatures.
Polyurethane coatings are used for variety of applications. Wood floors are generally coated with polyurethane. As polyurethane coatings can be waterproof and have high abrasion resistance, they are an excellent choice for this application.
Polyurethane coatings can be used on metals and on top of other coatings.
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