Abstract
Bulk dyeing with aqueous dispersions of pigments changes the parameters of the starting viscose. The strength and direction of these changes are a function of the degree of dilution of the viscose by the dispersions and the type and concentration of the pigment pastes in the dispersion. The bulk dyeing parameters of one dispersion of viscose differ from both the starting and other viscoses dyed in bulk with other dispersions. As a consequence, for constant parameters of the bath in which the fibre is formed, it is highly probable that spinning from viscose bulk dyed with different dispersions takes place differently. Incorporation of the modifiers Prestabit, Berol Visco 32, VK 1057, PEG 2000, or Berol Visco 385 in the amount of up to 1.5% in the viscose together with the dispersions does not significantly affect the basic parameters of the viscose except for its surface tension. It is not possible to improve the filterability of undyed and bulk-dyed viscose by adding these modifiers in the conditions selected for the study. Addition of VK 1057, Berol Visco 32, or Prestabit modifiers in the amount of up to 1.5% improves the transparency of viscose containing no pigment even if it is used immediately before spinning. The improvement in the transparency in the conditions described is especially strongly manifested when VK 1057 and Berol Visco 32 modifiers are used. The previously established compatibility of the pigment pastes and modifiers is not perturbed on addition to viscose. Incorporation of these modifiers in viscose together with aqueous dispersion of pigment pastes in an amount of up to 1.5% in the described conditions does not raise additional difficulties in spinning of the fibres.
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Sviloza Corp., Svishtov, Bulgaria. Translated fromKhimicheskie Volokna, No. 1, pp. 25–29, January–February, 1999.
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Penev, P.G. Effect of aqueous dispersions of pigments and modifiers on the properties of viscose. Exchange of experience. Fibre Chem 31, 32–37 (1999). https://doi.org/10.1007/BF02358698
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DOI: https://doi.org/10.1007/BF02358698