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