WHY DOES BATH FOUL (GETTING STICKY AND VISCOUS) REQUIRING FREQUENT CHANGE DURING RESIN APPLICATION USING MGCL2 6H2O?
The bath ‘fouling’ is invariably due to the presence of alkalinity on the fabric. Due to the alkaline nature of pre-processes the presence of residual alkalinity cannot be ruled out unless conscious effort is made to get it neutralized. Resin finishing with Magnesium Chloride as catalyst is much more vulnerable to ‘fouling’. Alkaline fabric would tend to neutralize the bath and the Magnesium Chloride would hydrolyze to form the hydroxide and release mineral acid that would facilitate self cross-linking of the resin. Progressively, the bath would become sticky and viscous with the precipitated hydroxide and the resin polymer necessitating changing of the bath at frequent intervals. Fabric should be treated with Acetic acid before finishing, at the last compartment of the washer /any other preceding operation to pH 5 to 5.5. This condition is mandatory irrespective of whatever resin (requiring acid-liberating catalyst) used. This would mitigate fouling of the bath requiring change at fre
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