Abstract
2-Ethylhexyl 2, 3-dihydroxypropyl phthalate (GOP) and bis (2, 3-dihydroxypropyl) phthlate (DGP) were prepared to examine the synergetic effect on the thermal stabilization of PVC with synergetic metal soaps (Zn stearate/Ca stearate).
1) GOP and DGP were both colorless and transparent liquid. GOP was soluble in bis (2-ethylhexyl) phthlate (DOP) but insoluble in water. On the other hand, DGP was insoluble in DOP.
2) GOP and DGP slow down the appearance of zinc burning and prolonged the good initial color of PVC films compounded with synergetic soaps.
3) The good synergetic effect of GOP and DGP should be due to the masking effect of their polyol segment, and phenyl and 2-ethylhexyl benzoate segments involved the ability to disperse GOP and DGP into PVC, but phthalic acid and phthalic anhydride accelerated the appearance of zinc burning.
