STUDIES ON THE CREASE RESISTANT FINISH WITH UREA FORMALDEHYDE RESIN

Abstract

Some experiments were carried out to find out the reaction between cellulose and dimethylol urea in predrying or baking process of urea formaldehyde resin finishing of the fabric. Namely, the author investigated the decomposition of s-bis methoxy methyl urea at various temperatures in the presence of HCl and the reaction of dimethylol urea with n-butyl alcohol at boiling point of the latter.The results obtained are summerized as follows.(1) At 75°C (predrying temperature) s-bis methoxy methyl urea in aqueous solution of pH 5.0 was unstable and produced a great amount of metylol groups by the hydrolysis of ether linkage.(2) In the reaction of dimethylol urea with n-butyl alcohol at boiling point of the latter, the formation of methylene urea became predominantly with the increase of acid concentration, though a small amount of ether formation was still accompanied.(3) s-Bis ethoxy methyl urea, when heated with an oil bath continiously passing dry HCl gas, liberated ethyl alcohol of about 85% of the theoretical value.From these results, there is little tendency of formation of ether cross linkage between cellulose and dimethylol urea in the case of urea formaldehyde resin finishing of fabric.