Waterborne hybrid emulsion polymers

A recent study suggests the use of Waterborne hybrid (alkyd/styrene acrylic) emulsion polymers for exterior paint applications.

Exterior paints should not only satisfy aesthetic demands, but also last in the long term and provide a protective function. Image source: Thordino - Fotolia (symbol image).

Since alkyd resins include hazardous solvents, converting alkyds into waterborne hybrid polymers is an essential research topic. Now alkyd/styrene acrylic waterborne hybrid polymers were synthesised in the presence of monomers, water, emulsifiers, and an initiator by using synthesised alkyd resins at 0%, 5%, 10%, and 15% ratios based on the total monomer ratio. Two different biosources, tall oil fatty acids (TOFA) and hemp seed oils (HSO), were used to synthesise the alkyd resins. Synthesised waterborne hybrid latexes and their films were analysed by using FTIR, NMR, particle size, MFFT, TGA, DSC, CA, AFM, and mechanical tests.

Exterior paints

It was determined that the type and concentration of the alkyds affected the viscosity, particle size, Tg and MFFT values, and appearance. It was also identified that alkyd incorporation took place with grafting and that the alkyd concentration was particularly effective in increasing the particle size. In addition, experiments were carried out on waterborne paint systems for exterior paint by using synthesized hybrid polymer emulsions. It was observed that the alkyd content was not effective in changing the paint colour in hybrid latexes. As a result, it is suggested that hybrid waterborne latexes could be used for exterior paints.

The study has been published in Journal of Coatings Technology and Research, Volume 20, Issue 5, September 2023.

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