Below is a list of events that are coming up. There may be the chance to schedule additional speakers and/or events during the year as we are informed of opportunities. The technical committee is always grateful to members for comments or suggestions as to what the membership would like to see arranged. Please inform us of any overseas visitors that may be candidates to speak to our members.

Auckland Tech Talk: Ransi Devendra, Whitfield Award Winner

Auckland Tech Talk:  Ransi Devendra, Whitfield Award Winner
Date: Wednesday, 10th April 2019
Time: 5.30pm arrival for 6.00pm start
Location: Fisher House, 117 Kerwyn Ave, East Tamaki

At the 2018 SCANZ Convention, Ransi Devendra was presented with the Whitfield Award, for his outstanding paper on:

"A new understanding of the mechanism for the catalysis of urethane formulation by organotin (IV) dicarboxylate".

We are thrilled that Ransi will present a talk on this paper in both Auckland and Wellington!

Surface coatings is an area of urethane technology and is rapidly gaining popularity due to ongoing performance improvements. Key to this is improved control of the catalysis of the urethane reaction obtained through an increased understanding of the catalysis mechanisms involved.

Organotin dicarboxylates are industrially important catalysts in the formation of urethanes by reacting an isocyanate with an alcohol. This catalyst works for both aliphatic and aromatic isocyanates, however the catalyst is more important for aliphatic isocyanates than aromatic isocyanate in industrial applications.

Investigations of catalysis mechanisms show that organotin dicarboxylate catalysis of aromatic isocyanates is different to the mechanism for aliphatic isocyanates for urethane formation in non-polar media. This is different from what is proposed in literature. Results in this study reveal that for organotin dicarboxylate catalysis of isocyanates in non-polar media, the carboxylate ligand of the catalyst contributes to catalysis of aliphatic isocyanates whereas the ligand has no effect for catalysis of aromatic isocyanates.

These conclusions were arrived at by comparing results obtained from investigations based on both experimental and computational methods. The new knowledge was used to prevent viscosity increase of low temperature synthesised aliphatic urethane pre-polymers in storage that are used in the manufacture of 1K moisture cure surface coatings.

Ransi is the Science and Technology Manager at Uroxsys Ltd., New Zealand, where he has been involved with development work on catalysts for urethane pre-polymers for the past 10 years.

He was recognised as an inventor for his catalyst work by the Bayer-NZ Business community in 2009. Ransi’s professional career has involved research and development work in polymer-related topics for the past 35 years. He has a B.Sc. (Natural Sciences), M.Sc. (Polymer Science and Technology) and Ph.D. (Chemistry).

We will have nibbles and drinks before we start, and again afterwards if people want to hang around.

Please RSVP by email to [email protected] or by phone on 09 910 0142 if you would like to come, so we can ensure there is enough food to reward you for braving the traffic!