Journal of the University of Chemical Technology and Metallurgy, XXXVI, Book 2, 2001

ON THE INTERACTION BETWEEN CHELATING EXTRACTANTS AND THE QUATERNARY AMMONIUM SALT ALIQUAT 336
V. Jordanov , M. Atanassova I. Dukov

University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail dukov@uctm.edu Received 17 October 2001
Accepted 18 October 2001

The interaction between the chelating extractants 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HP) or thenoyltrifluoroacetone (HTTA) and the quaternary ammonium salt Aliquat 336 in chloride (QCl) or perchlorate (QClO4) forms has been studied. The values of the equilibrium constant Kexc have been calculated on the basis of the experimental data. The influence of various factors on the interaction of the extractants has been discussed.
Keywords: Aliquat–336, 1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone (HP), Thenoyltrifluoroacetone (HTTA).

CONSTANT EXTERNAL MAGNETIC FIELD INFLUENCE ON THE VULCANIZATION PROCESS IN SOME ELASTOMERS
N. Dishovsky, K. Ruskova, N. Shoilev

University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: dishov@uctm.edu

Received 26 October 2001
Accepted 30 October 2001

The influence of an external homogeneous constant magnetic field with intensity of 1000 Oe on the vulcanization process in filled and unfilled compositions based on natural and nitrile butadiene rubber is investigated. The magnetic field influence is evaluated by studying of the vulkanizates swelling kinetics in suitable “good” solvents and comparison of their swelling degree and rate. It has been found that the magnetic field application accelerates the process of vulcanization. The magnetic field influences the sensitive singlet-triplet transitions in the radical couples formed during the vulcanization and consequently - the possibilities for recombination and the type and chemical nature of the intermediate and final vulcanization products obtained.
Keywords: magnetic fields, influence, vulcanization, degree of swelling

LOW TEMPERATURE CURE OF EPOXY RESIN WITH MODIFIED NOVOLACK PHENOLIC RESIN
H. Yordanova, I. Iliev, P. Petrenko, V.Vassilev

University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: ilia_iliev@hotmail.com

Received 23 October 2001
Accepted 31 October 2001

The curing interactions at an ambient temperature of the epoxy resin with modified by hexamethylenetetramine and p-tert-butyl phenol novolack phenolic resin were studied. The best empirically determined ratios of both components are found. The positive influence of the presence of imidazol in the novolack resin on the extent of the cure was established.
Keywords: epoxy resin, extent of cure, modified novolack phenolic resin, imidazol, reaction ratios.

DYEING OF CELLULOSE TEXTILE MATERIALS WITH MONO - AND POLYFUNCTIONAL REACTIVE DYES
A.Georgieva, D.Pishev

University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: pishev@uctm.edu

Received 30 October 2001
Accepted 06 November 2001

It was performed a comparative dyeing with monofunctional Drimaren K and polyfunctional Drimaren CL dyes manufactured by Clariant. 12 dyes and 8 methods of dyeing are investigated. It is established that the method of fixing with sodium carbonate and sodium hydroxide at 40oC is the most appropriate method for dyeing with monofunctional Drimaren K dyes from point of vew to depth of color and fastness. For polyfunctional Drimaren CL dyes more suitable is the Pad-roll method.
It is found that the blue Drimaren K dyes (except Drimaren bril. Blau KB) and the blue Drimaren CL dyes give considerable higher depth of color in comparison with the rest dyes for the most of exploited methods.
The fastness of wet properties of Drimaren K and Drimaren CL dyes are very good and good. They satisfy the consumer requirements.
Keywords: reactive dyes, methods of dyeing with reactive dyes, fastness of the color