Gelation Characteristics of Methylolated Melamines Polymerized by Acid Catalysis and Copolymerized with Dimethyloldihydroxyethyleneurea

Abstract

The times of formation and the yields of gel obtained by hydrochloric acid-catalyzed polymerization of five methylo lated melamines were determined at 25°C and 82°C. The substitution of the amino groups of the melamines ranged from trihydroxymethyl- to monohydroxymethylpentamethoxymethylmelamine. Homopolymerization and copolymer ization of these melamine reagents with dimethyloldihydroxyethyleneurea (DMDHEU) was studied for the purpose of optimizing the conditions and clarifying the roles of these reagents in the wet-fixation, durable-press process for modifying cotton textile fabrics. Polymers formed at gelation were characterized by their ir spectra and by formaldehyde-to- nitrogen ratios. The significance of this work relative to the wet fixation process is discussed.

Keywords

Monomers (commercials)melamines monomer formulas. Catalysts hydrochloric acid temperatures concentra tion methylated methylolmelamines DMDHEU polymerization copolymerization. Formaldehyde/nitrogen ratio gelation characteristics precipitation time gel time gel yield.

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