Abstract: The effect of particle size, content and morphology of calcium on the viscosity and stability of PVC plastisols were systemic investigated by vibrating viscometer. Results indicated that the plastisols prepared by 4.5 um calcium showed the highest viscosity and the worst stability. When maintaining the content of PVC resin at 100 phr, the PVC plastisols showed higher viscosity and worse stability with increasing the content of calcium. However, the PVC plastisols showed lower viscosity and better stability with increasing the content of calcium when maintaining the content of PVC and CaCO3 gross powder at 100 phr. The plastisols prepared by CaCO3 with diamond morphology showed lower viscosity, but the plastisols prepared by CaCO3 with batt morphology showed higher viscosity and the worst stability.

Key words: poly(vinyl chloride), calcium carbonate, viscosity, plastisol, stability