Ambient curable coating materials based on castor oil

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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.

Continue at: https://www.european-coatings.com/Raw-materials-technologies/Technologies/Ambient-curable-coating-materials-based-on-castor-oil/(cpg)/LA0093?cpg=LA0093&utm_source=newsletter&utm_medium=email&utm_campaign=EC-NL-2019-03-01&utm_content=Ambient-curable-coating-materials-based-on-castor-oil&uid=678731

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