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Lowering the volatile organic content (VOC) of industrial coatings has become a requirement in many reformulation and new coating development efforts, oftentimes in order to meet increasingly strict regulations. Driving VOC to lower levels and performance to higher levels can also offer a more sustainable coatings solution for the end-user. Lowering VOC and maintaining (or improving upon) high performance is often the goal when developing a new formulation, but the two objectives can be at odds with each other.
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The protection of commercial buildings from the elements is a major function of the coatings used in new build and maintenance applications. Waterborne elastomeric acrylic coatings represent an important category of coatings used in both residential and commercial architectural painting.
Due to their excellent performance properties, epoxy coatings are commonly used over metal and concrete substrates in applications where corrosion protection and chemical/solvent resistance are key requirements. One weakness of these epoxy coatings is their poor UV durability. Epoxy coatings typically have poor gloss and color retention as well as poor resistance to chalking on exterior exposure.
Waterborne polyurethane coatings have been used in the bridge preservation market for years as an alternative to solvent borne systems but early technologies required the bridge coatings engineer to compromise on properties or durability. Additionally, many of these early products still contained high levels of VOC although touted as waterborne technology. New alternatives have evolved that address these issues and fit well into an overall sustainability plan.
In recent years, many tall and large-scale structures have been constructed under harsh environmental conditions. It is required to protect steel structures from a variety of environmental factors over a long period of time. In order to meet such requirements, the increase in durability, extension of lifetime and reduction in life-cycle cost of protective coatings has constantly been the subject of investigations.
Over the last few years, the protective coatings industry has seen an increased demand for high performance waterborne coatings in the field of corrosion protection. Market drivers such as “Sustainability”, “Greenability”, and ongoing regulatory and environmental concerns continue to force coatings producers to look for other viable options to replace conventional solvent borne technologies.
Highly durable fluoropolymer coatings also generally have very good “stay-clean” properties. For this class of coatings, many of the factors contributing to stay-clean properties and exterior durability are linked. We will review these factors and examine particularly their role in affecting the properties of coatings based on the new waterborne fluoropolymer-acrylic hybrid technology. Using these principles, realistic estimates of the service life of these premium coatings can be determined.
Performance, cost, and safety drive the coatings industry. Safer and environmentally friendly coatings continue to be a hot topic of discussion globally; however, the adoption of greener coating technologies is slow, especially in the US. This could be attributed to many factors, but from the formulator's perspective, performance is key. Waterborne coatings have been used in architectural applications for decades, but typically these coatings are valued mostly for aesthetics, ease of use, and low cost.
Coatings designed for heavy duty applications in the Maintenance and Protective Coatings market are exposed to aggressive environments such as aggressive chemical solvents, marine atmospheres, UV light, abrasion, among others. In the US as well as other areas of the world, coatings designed for these applications have been primarily solvent borne.
A new system for waterborne 2K epoxies has been developed that presents a measurable value proposition. Performance testing results are presented that demonstrate the key features of coatings prepared with the new amine hardener and two different epoxy dispersions. The hardener is ultra-low-VOC and contains no free amines (no need for hazard labeling).
Waterborne coatings are safer to use than their traditional solvent borne counterparts and can reduce environmental impacts. As the market share for waterborne coatings has grown, there has been increased focus on their performance. Simultaneously, the building industry has been challenging coatings manufacturers to provide functional coatings. No longer are aesthetics, corrosion prevention and protection enough; a coating can and should provide multiple benefits to the user. One of the fastest growing segments of the functional waterborne coatings market is liquid applied insulation coatings.