Phosphorus-containing cardanol-based acrylates for flame-retardant coatings

Researchers describe the synthesis and the properties of phosphorus-containing cardanol-based acrylates for flame-retardant UV/EB-cured coatings.

With higher loadings of expandable graphite Image source: sbox - Pixabay (symbol image).

In the work, two kinds of phosphorus-containing cardanol-based acrylates were designed and synthesised. Firstly, a pre-polymer (PT-HCE) with three arms was synthesised using hydroxyethyl cardanol ether (HCE) and phosphorus oxychloride (POCl3) as raw materials. Then, the PT-HCE was acrylated to synthesise phosphate tris-hydroxyethyl cardanol epoxy acrylate resin (AEPT-HCE) and phosphate tris-hydroxyethyl cardanol photosensitive resin (APT-HCE). The structures of PT-HCE, AEPT-HCE and APT-HCE were characterised and the results showed that the photosensitive resins were successfully synthesised.

Excellent flame-retardant properties

In addition, AEPT-HCE and APT-HCE were used to prepare the flame-retardant UV/EB curing coatings. The properties of the coatings were tested, and the results revealed that different structures have a certain effect on Tg and tensile properties of the coatings. The cured films demonstrated excellent flame-retardant properties, showing flammability rating of V-0 in UL-94 test.

The study has been published in Journal of Coatings Technology and Research, Volume 18, 2021.

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