Stability of DMDHEU and Alkylated Crosslinking Finishes Towards Acidic and Alkaline Hydrolysis

Abstract

Cotton fabrics treated with various alkylated derivatives of DMDHEU were subjected to hydrolysis by urea-phosphoric acid, hot 23% sodium hydroxide, and urea-phosphoric acid followed by sodium hydroxide. Sequential treatment with acid and base removed more nitrogen and formaldehyde than the alkaline treatment, which removed more nitrogen and formaldehyde than the acid treatment. Stability of the crosslinks generated by these resins depended on both the degree of alkylation of DMDHEU and the nature of the alkyl cap. This stability was reflected in greater amounts of residual nitrogen and formaldehyde after hydrolysis. Those residues, in turn, affected the residual break ing strength, flex abrasion resistance, and wrinkle recovery of the hydrolyzed fabrics. The stability of the crosslinks also correlated well with formaldehyde release data for the treated fabrics.

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