Chemische und physikalische Vorgänge bei der Herstellung von Polyurethan-Weichschaumstoffen |
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| Authors: | Gü nter Hauptmann,Karl-Heinz D rner,Jü rgen Hocker,Hans Walter Illger,Gerhard Pfisterer |
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| Affiliation: | Günter Hauptmann,Karl-Heinz Dörner,Jürgen Hocker,Hans Walter Illger,Gerhard Pfisterer |
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| Abstract: | The kinetics of foam formation are observed by IR-spectroscopy. The formation of polyurethane and polyurea occurs simultaneously, the transition from the dissolved to the crystalline urea being chronologically measurable. The difference between hotcure and cold-cure (HR) foam is explained. NCO-linking reactions cannot be detected by IR-spectroscopy. Using a foam with a density of 26 kg/m3, a quantitative study of foam formation was made, using chemical methods of analysis. Gas yield and time of curing are determined. |
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