STUDIES ON DIFFUSION PHENOMENA IN WET SPINNING OF VISCOSE FIBER

(V) FORMATION OF Zn-XANTHATE

Abstract

Regarding the formation of Zn-xanthate from cellulose sodium xanthate, the fundamental study was made with xanthate model filaments. Influences of ZnSO₄ concentration and temperature of reaction bath and filament diameter (a) on Zn-xanthate formation were investigated.
The results are as follows:
(1) Clear boundary line (radius ξ from center of filament at time t) appeares between Na-xanthate and Zn-xanthate.
(2) The higher the concentration of ZnSO₄ in reaction bath is, the more quickly boundary line reaches to the center of the filament.
(3) In spite of the diameter changes of the filament, the relations of ξ/a_??_t/T (T: time until the boundary line reaches the center of filament) are drawn in one curve. The relation of T_??_a² is straight.
(4) Regardless of the temperature of reaction bath, ξ/a_??_t/T relations are indicated by one curve; however, the value of T becomes smaller with rising temperature.
(5) With increase of cellulose content of the filament, the value of T increases.