2014 (3) 5

Peculiarities of thermal dissosiation of e-caprolactam-blocked tolylenediisocyanate

A.V. Hubina, T.V. Dmitrieva, V.I. Bortnitsky

Institute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shause, Kyiv, 02160, Ukraine

Polym. J., 2014, 36, no. 3: 257-261.

Section: Structure and properties.

Language: Russian.

Abstract:

This paper concerns the research of thermal dissociation peculiarities of e-caprolactam-blocked tolylenediisocyanate (TDIb) via the method of pyrolitic mass-spectrometry. It was revealed that this method is effective for determination of TDIb deblocking temperature (Tdeblock.). Pyrolisys of TDIb consists of two stages. It was shown that side products and catalyst presence decrease deblocking temperature for 20 °C and the range of deblocking process as well. The side products such as e-caprolactam-blocked urethdiones decrease deblocking temperature of the composition to 130 °С in comparison to 165 °С of pure TDIb. Thus, side products and catalyst decrease dissociation value at its early stage and lead to     e-caprolactam delivery into the reaction mixture as a low-molecular filler under the temperatures lower then <150 °С.

Keywords: blocked isocyanates, tolylenediisocyanate, e-caprolactam, pyrolitic mass-spectrometry, deblocking temperature.