Add time:08/06/2019         Source:sciencedirect.com

The effect of mixtures of azo acid dyes (C.I. Acid Yellow 135, C.I. Acid Red 266 and C.I. Acid Blue 62) and azo acid metal complex dyes (C.I. Acid Brown 226, C.I. Acid Blue 171, C.I. Acid Orange 162 and C.I. Acid Black 107) on the photooxidative stability of nylon 6,6 film and fibre samples has been examined using UV absorption, viscometric analysis, tensile strength, elongation and toughness. The data have been related to the concentration of the fluorescent and phosphorescent unsaturated carbonyl chromophores in the polymer. Both dye mixtures increase the photostability, consistent with their ability to reduce or quench the luminescent species in the polymer. The viscosity changes correlate well with the tensile data apart from a detrimental effect by the dye bath control giving rise to a large decrease in tensile performance. Post-treatment of the nylon 6,6 in a nitrogen atmosphere for 3 h is found to have a more detrimental effect on the polymer photostability than that carried out under steam and this is also reflected in the generation of luminescent species in the polymer. In delustred nylon 6,6 the rate of photooxidation is dominated by the titanium dioxide pigment and this is also reflected by quenching of the excited states of the luminescent species. Stabilisation of the polymer is achieved through the use of a four-component mixture containing a hindered piperidine light stabiliser together with a phosphite and a metal deactivator/antioxidant system, with the non-metal acid dye mixture exhibiting the strongest effect. Phosphites are less effective alone due to hydrolysis during the autoclave operation while the metal deactivator is highly efficient.

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