Viscosity of PVC plastisol

The plasticizer-range alcohols are largely used as feedstock for production of high molecular weight diesters of phthalic, adipic, azelaic, and sulftiric acids. All these are used primarily in plasticizers for polyvinyl chloride (PVC) and other plastics. The plastics industry also uses them as additives for heat stabilization, to control the viscosity of PVC plastisols, ultraviolet absorbers, flame retardants, and antioxidants. They are also found in synthetic, lubricants, agricultural chemicals, and defoamers. 

Now let s summarize the data on the viscosity of PVC plastisols. First, as concerning injection moulding (filling of thin moulds), both the plastisols (those showing and those not showing thyxotropic phenomena) may be considered as non-linear liquids with no characteristic times provided that the filling time is much larger than the characteristic time of the medium. 

Auxiliaries to decrease viscosity of PVC-plastisols improve the coating properties and deaeration of PVC-plastisols. Do not change the thermo-stability and light-fastness. 

Figure 11.50. Complex viscosity of PVC plastisol at 140°C vs. concentration of di-(2-ethylhexyl) phthalate. [Data from Marcilla A Garcia J C, Eur. Polym. J., 33, No.3, March 1997, p.357-63.]...

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