MISCIBILITIES OF POLYMERS IN BITUMEN AND TALL OIL PITCH UNDER DIFFERENT MIXING CONDITIONS

The miscibilities of the most important types of waste plastics were s tudied both by mixing them directly in bitumen and by using tall oil p itch as a dispersing agent. The results are presented as triangular di agrams based on softening points. The mixes containing PE-LD or PP bec ome softer when 5-30 wt% bitumen is replaced by tall oil pitch. Two di fferent mixing procedures were studied; so-called substrate mixing was found to yield better results than direct mixing. To be successful, s ubstrate mixing requires a sufficiently high blending temperature and intensive agitation. Finally, a substrate can be diluted with suitable base bitumen according to use. Copyright (C) 1996 Elsevier Science Lt d.