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4. Nov 2015 | Coatings Technologies

Synthesis of hybrid alkyd-acrylate latexes via miniemulsion polymerisation

Ricinodendron heudelotii (Rh) oil-based novel alkyd-acrylate hybrid latexes were synthesised as waterborne environmental friendly binder for coating systems.

Indian researchers synthesised novel oil-based alkyd-acrylate hybrid latexes as waterborne environmental friendly binder for coating systems. Source: Verena N./pixelio.de

Long oil length alkyd resins were synthesised by two-stage alcoholysis–polyesterification reaction with variation of phthalic anhydride (PA) and maleic anhydride (MAH) proportion and further polymerised with methyl methacrylate (MMA) and butyl acrylate (BA) via miniemulsion polymerisation.

Rh oil based latexes exhibit fast drying

It is found that increasing the proportion of MAH in the alkyd resin enhances monomer conversion and total solid content of the hybrid latex. The latexes exhibited fast drying time at room temperature. The prepared latexes showed a bimodal particle size distribution motion. It is shown that the increase in MAH content in the alkyd moiety has a significant effect on the improved performance properties of hybrid latexes as well as latex films including, fast drying time at room temperature, highly crosslinked network, improved mechanical characteristics before and after UV exposure, better shore A hardness and hydrophobic water repellency contact angle.

Alternative to petroleum-based coatings

The results suggested that, the R. heudelotii oil-based alkyd–acrylate hybrid latexes have potential improved properties for manufacture of waterborne coatings and are usable as an alternative to petroleum-based coating systems.

The study is published in: Progress in Organic Coatings, Volume 86, September 2015, Pages 25–32

EC Library Polyester and Alkyd Resins

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Polyester and Alkyd Resins

Polyester and alkyd resins belong to the most diverse and important material classes of paint chemistry and their usage as binders has been established for a long time. This standard work goes into detail on the composition, structure and properties of these important binder groups and subjects previous findings in that field to a critical review. It shows different precise calculation approaches in modern coatings development, ways to formulate polyester and alkyd resins in experimental designs and how to vary them systematically. A practice- and future-oriented reference book that should not be missing in any laboratory!

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