Abstract
The ageing properties of CaCO 3 filled polypropylene (PP) composite have been studied using light, weathering and oven ageing. The results show that industrial grade CaCO 3 can slightly inhibit the thermo-oxidation of PP, while the effect of CaCO 3 on the photo-oxidation of PP is very small. The photo-oxidation and thermo-oxidative stability of PP can be improved by adding Hindered Amine Light Stabilizer (HALS) and phenol antioxidant. The effectiveness of light stabilizer or antioxidant is considerably decreased by adding CaCO 3. The effectiveness of light stabilizers is in the order 770 > 540 > 531 > PDS while the effectiveness of antioxidants is in the order 1010 > 264. The effects of industrial CaCO 3 on the thermo-oxidation of PP and on the effectiveness of stabilizer have been discussed and the compositions of filled PP with long use life time have been proposed.
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