The introduction of waterborne acrylic (latex) paint technology more than 50 years ago, commercial coatings manufacturers found an alternative to the traditional solvent borne alkyd chemistries that had been the mainstay of the coatings industry until that point in time. Waterborne paint chemistry offered significant advantages to both manufacturers and end users of coatings, including easier clean-up and lower VOC content when compared to solvent borne alkyds, which required significant amounts of organic solvent additives during the manufacturing process. However, the switch to waterborne chemistries did not completely eliminate the VOC content of acrylic-based coatings. All acrylics, particularly “gloss” acrylic latex formulations, require the addition of organic solvents to enable coalescence and coating film formation. Paint manufactures are now required by law to reduce their product VOC content and volatile solvent products have been banned for use or will be fazed out of production in the near future.
Prisum Coatings Canada Inc as a manufacturer of paints having the realization in 2008 that next generation paints had to be considered and in conjunction of Canadian government R&D programs commenced the design, formulation, and development of sustainable, environmental next generation coating technology. The technology identified was an advanced water solvent Soya oil alkyd processing technology to produce a solvent-free alkyd binder formulation in a surfactant-stabilized aqueous emulsion. Traditionally agricultural oils have always been used to manufacture high solvent borne alkyd coating products, simply the solvent now is water which provides a sustainable organic paint base formula, with all the benefits of a waterborne carrier with extremely low VOC content and retaining the properties of an oil paint.
Acrylic latex-based coatings, by contrast, typically have a higher molecular weight due to the chemical composition of their formulations. As such, the acrylic polymers within spherical latex particles will demonstrate very high viscosity and very little flow and levelling. As a result, they have comparatively poor substrate wetting properties and thus do not typically exhibit the same type of adherence and flow characteristics as Soya oil coatings. Extensive performance testing was conducted comparing Soya oil products with commercially available traditional waterborne latex acrylic formulations for gloss rating, block resistance, adhesion, dry time, weathering, and stain blocking characteristics coating products for dry times, color stability, solids coverage, weather ability and VOC content. In all comparisons of test procedures, Soya oil demonstrated superior performance at VOC levels well below the regulatory limits currently in place internationally. Products have a broad range of pigment volume concentration (35% to 60%) a full range of gloss ratings was achieved from 20degree up to 80 degree readings while maintaining VOC levels below 16g/L. Soya oil adheres to all substrates suitable for coating technologies and does not require conversion primers to be applied over high solvent borne coated structures.
The innovation achieved so far continues our realisation of our product developments for many more application that we originally had not foreseen. Soya oil coating technology provides a sustainable product combined with the performance advantages of alkyd-based paint chemistries with the convenience of solvent-free, waterborne coatings, with near zero VOC content with out the loss of high quality commercial performance.