THE EFFECT OF ADDING PROCESSED PVC ON THE RHEOLOGY OF PVC PLASTISOLS

In this paper the possibility of recycling the PVC resulting from the rotational moulding of plastisols is studied. Parts of processed PVC w ere ground with liquid nitrogen into four fractions of different sizes which were added to a plastisol at different concentrations. A study of the influence of the amount and size of the recycled PVC in the vis cosity of the plastisol and in the gelation and fusion processes was c arried out. Furthermore, samples were taken at different temperatures and observed by SEM (scanning electron microscopy). Results obtained f or plastisols with the recycled PVC show a marked increase in the visc osity and moduli reached during gelation with time, which are more mar ked as the amount of recycled PVC increase and the particle size decre ase. However, plastisols including recycled PVC show and adequate proc essability if they are used immediately after their preparation. (C) 1 998 Elsevier Science Ltd. All rights reserved.