Zur Analytik von Harnstoff-Melamin-Formaldehyd-Harzen |
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Authors: | Dietrich Braun und Hans-Josef Ritzert |
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Institution: | (1) Deutsches Kunststoff-Institut, Schloßgartenstrasse 6R, D-6100 Darmstadt, Bundesrepublik Deutschland |
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Abstract: | Summary A method is described for the distinction between urea-formaldehyde and melamine-formaldehyde resins by precipitating the melamine derivates with picric acid. The analysis of this precipitation by urease-decomposition gives information whether urea and melamine are condensed with formaldehyde together or whether the investigated resin is only a mixture of an urea-formaldehyde and a melamine-formaldehyde resin.Moreover, it is possible to prove the formation of cocondensates of urea, melamine, and formaldehyde during the three-component condensation by combination of these two methods. |
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