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Monday, 16 September 2019
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Raw materials & technologies, Technologies, Powder coatings

New blocked polyisocyanates crosslinkers for polyurethane powder coatings

Thursday, 10 November 2016

In a study, the thermal behaviour of new blocked polyisocyanate crosslinkers for polyurethane powder coatings was investigated.

Polish researchers proposed new blocked polyisocyanate crosslinkers for polyurethane powder coatings. Source: Stephanie Hofschlaeger/pixelio.de

Polish researchers proposed new blocked polyisocyanate crosslinkers for polyurethane powder coatings. Source: Stephanie Hofschlaeger/pixelio.de

Blocked polyisocyanates were synthesised on the basis of biuretization process using isophorone diisocyanate (IPDI) and formic acid as biuretizing agent. ε-caprolactam was employed as blocking agent. Blocked polyisocyanates were additionally modified with α,ω-bis(hydroxyethyleneoxypropylene)-poly(dimethylsiloxane).

Higher thermal stability of urethane-polysiloxane

The thermal behaviour was investigated by means of coupled thermal analysis, differential scanning calorimetry and Fourier transform infrared spectroscopy (TG/DSC/FTIR). The TG analyses reveal that thermal decomposition of the blocked diisocyanate and blocked polyisocyanate comprising biuret moieties occurs in two main steps in the range of 120–275 °C and 310–375 °C, respectively. However, two additional stages in the range of 275–310 °C and 375–500 °C, for blocked polyisocyanate modified with polysiloxane, were observed.

The study is published in: Progress in Organic Coatings, Volume 101, December 2016, Pages 240–244

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