STUDY ON SPINNING MECHANISM OF VISCOSE

Abstract

The action mechanism of modifier in super high tenacity rayon spinning was studied. Combining the results of the previous studies on modifier with the present findings, it is shown that the action of modifier could be satisfactorily explained by the following mechanism.(1) Amine reacts with NaOH and CS2 in viscose and converts into Na-dithiocarbamate, which reacts with zinc ion in the spinning solution and precipitates as a more stable Zn-dithiocarbamate colloid than ZnS on ZnCS3 colloid in a lower pH range.(2) Polyethyleneglycol acts as a protective colloid of ZnS or ZnCS3 colloid and stabilizes ZnS or ZnCS3 in a lower pH range.(3) When modified viscose is spun into the spinning solution, these more stable modifier-zinc chilate compound colloid than ZnS or ZnCS3 colloid in a lower pH range initially, precipitates on the viscose filaments, forms a semipermeable membrane, and controls coagulation, dehydration and regeneration rate of the spinning fillament by the osmotic effects. Consequently, the fillament is dehydrated quickly, regenerated gradually at a lower degree of swelling and gives a cross section of all skin.