Cardanol-based anhydride curing agent for epoxy coatings

A recently published paper deals with the synthesis of dianhydride curing agent for epoxy resins from bio-based cardanol. The scientists evaluated the performance properties of coatings cured with synthesized curing agent as well.

Cardanol is extracted from the waste shells of cashew kernels. Source: Tariq786 / Pixabay. -

In a present research work, cardanol based di-anhydride curing agent was synthesized and used in the preparation of anticorrosive epoxy coatings. For this purpose, cardanol and glycidyl methacrylate were first reacted and subsequently malenized using maleic anhydride to yield di-anhydride compound which was used as a curing agent for commercial epoxy resin.

Cardanol performed well

Structure of the curing agent was confirmed by evaluating its acid and iodine value as well as Fourier transform infrared spectroscopy, proton and carbon nuclear magnetic resonance spectroscopy and gel permeation chromatography techniques. Coatings were formulated by varying the ratio of epoxy adduct to anhydride on equivalent basis such as 1:0.6, 1:0.8, 1:1. Further, the prepared coatings were characterized for mechanical, chemical, optical, thermal, insulating, anticorrosive properties etc. and compared with commercial methyltetrahydrophthalic anhydride cured epoxy coatings. It was observed that curing agent based on cardanol performed well in all aspects as compared to commercial curing agent.

The study is published in: Progress in Organic Coatings Volume 118, May 2018, Pages 9–21.

Image source: Pixabay

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