Abstract
Bleaching effects of mono-, di-and tri-chloromelamin.e were evaluated by both the discoloration of Acid Orange R (C.I. 15575) solution and changes in the surface reflectance of unbleached cotton cloths. The effects were compared with those of a new bleaching agent, potassium dichloroisocyanurate (K-DCIC), the nature of which has already been reported by the authors in this Journal. Chloromelamine compounds were stored in desiccators which had been adjusted to make inside relative humidity (RH) of 40, 60 and 80%. The stability of the compounds was checked by available chlorine contents.
The results indicate that :
1. Available chlorine contents scarcely change during storage.
2. The effect and mechanism of bleaching by chloromelamine compounds seem to be similar to those of K-DCIC except pH influence.
3. Practicable conditions of bleaching cotton by chloromelamine compounds are over 250ppm of effective chlorine concentration and pH 3-5 of solution alkalinity.
