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This paper is a significant update to “Costing Considerations for Maintenance and New Construction Coating Work”1 on protective coating costing and selection co-authored by M. F. Melampy, M. P. Reina and K. R. Shields in 1998. Designed to assist the coatings engineer or specifier in identifying suitable protective coating systems for specific industrial environments.
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Update to “Expected Service Life and Cost Considerations for Maintenance and New Construction Protective Coating Work” - NACE Corrosion 2014.Designed to assist the coatings engineer or specifier in identifying candidate protective coating systems for specific industrial environments.
Recently, the advantages of thick film coatings and linings have led to uses in many different applications in the industrial, commercial and automotive markets. Although this polyurethane and polyurea materials have excellent physical properties, they are based on aromatic chemistry which is susceptible to damage from UV radiation and is not light stable.
Formulators of these coatings need to address the legislations strongly pushing toward lower VOC content. All around the World, Governments, Paint Manufacturers and Applicators are still discussing viable options, though there is no doubt that challenges related to higher solids content in coating formulations will continue to increase.
Solvent-free two component polyurethane (2-K-PU) systems have been approved as suitable protective coatings systems since many years. Two component polyurethanes are favored within pipeline and tank constructions where high performance and durability have to be accomplished under harsh conditions (e.g., field application, high service temperatures, high salt load, wet soil conditions etc.).
Major manufacturers of protective coatings, steel fabricators, painting contractors, galvanizers, and end users, were surveyed to identify surface preparation and coating application costs, coating material costs, typical industrial environments and available generic coatings for use within those environments, and expected coating service lives (practical maintenance time).
VOC was one of the paint emissions accused to be an environmental hazardous material and among the main causes for SBS (Sick Building Syndrome). The term SBS was coined in the late 1970's to describe situations where building occupants experienced acute health problems. “According to WHO (World Health Organization), 4.3 million people a year die from the exposure to in-house air pollution”
Many common organic solvents that are utilized daily in industrial, commercial and academic settings are known to be toxic to workers, end-user as well as detrimental to the environment. As awareness increases to the deleterious effects of these solvents, regulations for emissions and exposure are constantly being reviewed and updated to restrict their use across industries and the sale of such products in the marketplace.
Regulations limiting Volatile Organic Content (VOC) have led to increased interest in solvent-free epoxy coatings, but the use of these coatings can give significant performance advantages and not just environmental compliance.