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Friday, 19 July 2019
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Raw materials & technologies, Technologies

Ambient curable coating materials based on castor oil

Wednesday, 27 February 2019

Using a Knoevenagel condensation cross-linking technique, scientists developed new ambient curable coatings based on acetoacetylated castor oil.

The acetoacetylated castor oil was synthesised during the study and the films were cured using aromatic dicarboxaldehydes. Source: Picture Partners – stock.adobe.com.
The acetoacetylated castor oil was synthesised during the study and the films were cured using aromatic dicarboxaldehydes. Source: Picture Partners...

The acetoacetylated castor oil was synthesised via the reaction of castor oil with t-butyl acetoacetate, and the films were cured at ambient temperatures (25°C) using aromatic dicarboxaldehydes as crosslinkers.

Preparation with different aromatic dicarboxaldehyde cross-linkers

The scientists optimised the curing conditions of the coating and found that a ratio of acetoacetylated castor oil to dicarboxaldehyde groups of 1:0.75 and a catalyst loading of 7.5wt % provided an appropriate curing time and the coating with the best performance. Moreover, they prepared films with different aromatic dicarboxaldehyde cross-linkers and characterised the mechanical and thermal properties of these films.

The study is published in: Progress in Organic Coatings Volume 129, April 2019, Pages 21-25.

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