EFFICIENCY OF MODIFIED PHTHALOCYANINE COMPOUNDS AS ANTIOXIDANTS AND UV STABILIZERS FOR SBR VULCANIZATES

Modified phthalocyanine compounds were prepared from the condensation of 3, 4, 9, 10 perylene tetracarboxylic acid dianhydride, phthalic anh ydride and urea with and without chloride salts of Fe II, Co II, and N i II, under phthalocyanine preparation conditions by the urea fusion t echnique. The highly coloured metal free-, Fe-, Co-, and Ni-modified p hthalocyanine compounds were incorporated into styrene-butadiene rubbe r (SBR) mixes. The rheometric characteristics of the rubber mixes were determined. The physicomechanical properties of SBR vulcanizates were evaluated with and without exposure to thermal ageing, The obtained r esults revealed that Ni-modified phthalocyanine has superior efficienc y as an antioxidant for SBR vulcanizates, and 1 phr of that compound i s the optimum concentration. UV exposed SBR vulcanizates showed that n ickel-modified phthalocyanine is a good UV stabilizer and 2 phr is the optimum concentration that can be significantly used in SBR. All samp les subjected to UV radiation showed no significant change of colour u p to 300 hrs of exposure.