Abstract
Problems on the polymerization and condensation reaction of N-methylolacrylamide within cotton fabrics in which K2S2O8, (NH4) 2S 2O8, or H2O2 was used as initiator and NH4 Cl or (NH4 )2HPO4 used as the acid condensation catalyst were investigated primarily from the standpoint of the crease resistance of the treated fahric. The results obtained are as follows.
The pre-drying process can be neglected, as almost the same result could be obtained even in the case of direct curing procedure, in which care should be taken not to over- cure.
Crease recovery and abrasion resistance (flat) of the treated fabric increased with higher value of resin content ; tear strength, on the contrary, decreased presumably with some intrinsic cause.
The effect of the addition of acid catalysts such as NH4Cl on the extent of the crease resistance was considerable, although some marked improvement was obtained in neutral catalysts such as K2S2O8 alone.
The addition of comonomers such as acrylamide and hexamethylene diamine HCl-salt as well as softeners to the treating bath was effective in improving the strength losses induced by this treatment. Aftertreatment of the N-methylolacrylamide-treated fabric with hexamethylenediamine or thereafter with formalin was also effective, since some what continuous distribution of the different kinds of network-structures within the fiber could be obtained by this procedure.
Durability of the treated fabric for boiling-alkali launderings was excellent.
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