Thermal and THERMOXIDATIVE STABILITY OF POLYVINYL CHLORIDE PLASTICIZED WITH DIOCTYL TEREPHTHALATE
Some aspects of the problem of the use of diester phthalate plasticizers for PVC plastics are considered. The influence of plasticizer dioctyl terephthalate on the rate of thermooxidative dehydrochlorination of PVC is studied. It is established that dioctyl terephthalate has higher thermal and oxidation resistance and has a smaller effect on thermal-oxidative degradation of PVC, in comparison to the widely used in the production of PVC plasticizer with dioctyl phtalate. The effect of non-toxic antioxidants 2,6-di-tert-butyl-4-methyl-phenol (ionol) and ether 4-hydroxy-3,5-di-tert-butylphenylphosphine acid (Irganox 1010) on the process of accumulation of hydroperoxides and selected effective dosage of antioxidants to inhibit oxidative decomposition of the polymer were studied. The efficacy of a plasticizer DOTP in comparison with the DOP estimated in a range of technological and operational characteristics cable plastic stamps OM-40. It was found that DOTP provides a higher level of complex technological and operational properties of polymeric material. The possibility of complete replacement of the toxic plasticizer dioctyl phthalate with non-toxic dioctyl terephtalate was shown. The use of dioctyl terephtalate stabilized by antioxidants is advisable to improve the thermal stability and durability of PVC compounds.