Efficiency of Modified Phthalocyanine Compounds as Antioxidants and UV Stabilizers for SBR Vulcanizates

Abstract

Modified phthalocyanine compounds were prepared from the condensation of 3, 4, 9, 10 perylene tetracarboxylic acid dianhydride, phthalic anhydride and urea with and without chloride salts of Fe II, Co II, and Ni II, under phthalocyanine preparation conditions by the urea fusion technique. The highly coloured metal free-, Fe-, Co-, and Ni-modified phthalocyanine compounds were incorporated into styrene-butadiene rubber (SBR) mixes. The rheometric characteristics of the rubber mixes were determined. The physico-mechanical properties of SBR vulcanizates were evaluated with and without exposure to thermal ageing. The obtained results revealed that Ni-modified phthalocyanine has superior efficiency as an antioxidant for SBR vulcanizates, and 1 phr of that compound is the optimum concentration. UV exposed SBR vulcanizates showed that nickel-modified phthalocyanine is a good UV stabilizer and 2 phr is the optimum concentration that can be significantly used in SBR. All samples subjected to UV radiation showed no significant change of colour up to 300 hrs of exposure.