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Tuesday, 17 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Preparing a novel urethane polyol via nonisocyanate route

Monday, 10 November 2014

In a study, researchers report preparation of a novel cashew nut shell liquid (CNSL)-based polyol bearing urethane groups.

Indian researchers prepared a novel cashew nut shell liquid (CNSL)-based polyol bearing urethane groups. Source: Pixelio

Indian researchers prepared a novel cashew nut shell liquid (CNSL)-based polyol bearing urethane groups. Source: Pixelio

The urethane group in the polyol was induced via isocyanate free route from the reaction of cyclic carbonate with primary amine. The polyol was characterised by determination of hydroxyl number, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and so forth. The polyol was then used as coating component and cured with hexamethoxy methylene melamine (HMMM).

Formulations were cured with variable amounts of HMMM

Another CNSL-based polyol without urethane moiety from our earlier reported work was used for preparation of coating for comparative study to determine the effect of urethane group on the coating properties. The coating formulations based on these two polyols were cured with variable amounts of HMMM hardener to optimise coating properties. All the coatings were evaluated for mechanical properties such as adhesion, flexibility, pencil and scratch hardness, impact resistance, pull-off, and adhesion. The optimised coatings were also evaluated for chemical and thermal properties. It was observed that the urethane containing polyol resulted in better adhesion to the metal substrate at higher quantity of HMMM hardener compared to the other polyol providing significant improvement in various coating properties. The final coating properties were also compared with the acrylic polyurethane coatings.

The study is published in: Journal of Applied Polymer Science, Volume 132, Issue 5, February 5, 2015.

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