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New Developments in Aliphatic Polyurea Coatings

New Developments in Aliphatic Polyurea Coatings
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Two component spray polyurea systems are fast reacting and provide quick return-to-service coatings. Aromatic polyurea coatings have good physical properties but discolor upon exposure to UV light due to the aromatic content. Some of these aromatic systems have been coated with an aliphatic topcoat to provide the desired color stability. 

Product Number: 41212-720-SG
Author: Paul Wiggins, Thalan Burris, Sam Lane
Publication Date: 2012
Industry: Coatings
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$20.00
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Two component spray polyurea systems are fast reacting and provide quick return-to-service coatings. Aromatic polyurea coatings have good physical properties but discolor upon exposure to UV light due to the aromatic content. Some of these aromatic systems have been coated with an aliphatic topcoat to provide the desired color stability. Spray aliphatic polyurea coatings do not discolor upon UV exposure due to the absence of aromatic content but react rapidly making it difficult to formulate a robust coating system. A new aliphatic secondary diamine has been developed and will be referred to as Aliphatic Amine A in this paper. Aliphatic Amine A is a versatile new aliphatic curative having moderate cure speed, allowing the formulation of robust fully aliphatic spray polyurea coatings. New aliphatic polyurea spray coatings based on HDI, and Aliphatic Amine A has very good physical properties, comparable to commercial aromatic offerings. The moisture transmission rate through these new aliphatic coatings is 2-2.5 times lower than aromatic systems. This improved moisture barrier performance allows coating application at nominally half the thickness typically used in aromatic systems.

Two component spray polyurea systems are fast reacting and provide quick return-to-service coatings. Aromatic polyurea coatings have good physical properties but discolor upon exposure to UV light due to the aromatic content. Some of these aromatic systems have been coated with an aliphatic topcoat to provide the desired color stability. Spray aliphatic polyurea coatings do not discolor upon UV exposure due to the absence of aromatic content but react rapidly making it difficult to formulate a robust coating system. A new aliphatic secondary diamine has been developed and will be referred to as Aliphatic Amine A in this paper. Aliphatic Amine A is a versatile new aliphatic curative having moderate cure speed, allowing the formulation of robust fully aliphatic spray polyurea coatings. New aliphatic polyurea spray coatings based on HDI, and Aliphatic Amine A has very good physical properties, comparable to commercial aromatic offerings. The moisture transmission rate through these new aliphatic coatings is 2-2.5 times lower than aromatic systems. This improved moisture barrier performance allows coating application at nominally half the thickness typically used in aromatic systems.

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