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Past Versus Present - Comparing Laboratory Performance of Vinyl Resin Coatings with Modern Epoxy-Polysiloxane Coating Systems

Past Versus Present - Comparing Laboratory Performance of Vinyl Resin Coatings with Modern Epoxy-Polysiloxane Coating Systems
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Starting in the 1940’s, solution vinyl resin coatings were used extensively to protect steel structures in fluctuating immersion service from corrosion. However, these systems fell out of favor when more restrictive volatile organic compounds regulations were implemented in the 1990’s. Since then, traditional epoxy systems have become a workhorse in the protective coatings industry. Unfortunately, these materials tend to degrade in sunlight, and experience has revealed their service life to be suboptimal compared to legacy coatings systems such as vinyls

Product Number: 51217-076-SG
Author: David Tordonato, Bobbi Jo Merten, Allen Skaja
Publication Date: 2017
Industries: Coatings and Linings , Coatings
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$20.00
$20.00

Starting in the 1940’s, solution vinyl resin coatings were used extensively to protect steel structures in fluctuating immersion service from corrosion. However, these systems fell out of favor when more restrictive volatile organic compounds regulations were implemented in the 1990’s. Since then, traditional epoxy systems have become a workhorse in the protective coatings industry. Unfortunately, these materials tend to degrade in sunlight, and experience has revealed their service life to be suboptimal compared to legacy coatings systems such as vinyls. Consequently, the Bureau of Reclamation has engaged in an effort to study vinyl coatings and identify potential replacement materials. Newer polysiloxane materials have been developed as a topcoat to combine the advantages of epoxy primer corrosion protection with enhanced weathering resistance. The current study investigated two vinyl resin paint systems applied per US Army Corps of Engineers specifications. One system contained a zinc-rich vinyl resin primer, and the second system did not. Two commercially available coating systems were also tested side-by-side for comparison: a glass flake pigmented epoxy primer with a polysiloxane topcoat and a solvent-borne epoxy primer with a polysiloxane topcoat. Each system was subjected to a series of accelerated weathering laboratory and durability tests. While the polysiloxane topcoat provided adequate ultraviolet resistance, both vinyl systems allowed for less rust creep and better barrier protection in laboratory testing.

Starting in the 1940’s, solution vinyl resin coatings were used extensively to protect steel structures in fluctuating immersion service from corrosion. However, these systems fell out of favor when more restrictive volatile organic compounds regulations were implemented in the 1990’s. Since then, traditional epoxy systems have become a workhorse in the protective coatings industry. Unfortunately, these materials tend to degrade in sunlight, and experience has revealed their service life to be suboptimal compared to legacy coatings systems such as vinyls. Consequently, the Bureau of Reclamation has engaged in an effort to study vinyl coatings and identify potential replacement materials. Newer polysiloxane materials have been developed as a topcoat to combine the advantages of epoxy primer corrosion protection with enhanced weathering resistance. The current study investigated two vinyl resin paint systems applied per US Army Corps of Engineers specifications. One system contained a zinc-rich vinyl resin primer, and the second system did not. Two commercially available coating systems were also tested side-by-side for comparison: a glass flake pigmented epoxy primer with a polysiloxane topcoat and a solvent-borne epoxy primer with a polysiloxane topcoat. Each system was subjected to a series of accelerated weathering laboratory and durability tests. While the polysiloxane topcoat provided adequate ultraviolet resistance, both vinyl systems allowed for less rust creep and better barrier protection in laboratory testing.

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