Polyvinyl Chloride Plastisols

In this study, the changes in the rheological curves of polyvinyl chloride (PVC) plastisols with increasing storage time and the factors affecting the changes were studied,. The results show that with increasing storage time, all the "viscosity–temperature" and "viscosity–time" rheological curves of PVC plastisols exhibit non-normal distribution change trends, i.e., the viscosity first decreases, and then changes from slow increasing to rapid increasing, forming a shoulder peak, reaches to the maximum value and gradually decreases. With increasing storage time, the viscosity of PVC plastisol changes significantly in each stage, exhibiting an overall increasing trend; however, the corresponding transition temperature and time of PVC plastisol did not change.
Keywords: Poly vinyl chloride; plastisol; rheology; storage time; viscosity

Polyvinyl) chloride (PVC) plastisol refers to the suspension dispersion system formed through stirring and dispersing PVC paste …show more content…
In the ordinary storage environment, the change in the viscosity with time of PVC plastisol has a distinct effect on the stability of processing conditions for products. Previous studies indicate that in practical application, the viscosity of PVC plastisol increases with increasing storage time [1]; the type of raw materials such as paste resin[2] and plasticizer[3], as well as the processing technology[4], affect the viscosity. As for the follow-up molding process of the product, the PVC plastisol undergoes gelation, fusion, and molding under a certain baking temperature and time. Therefore, the changes in the rheological properties of PVC plastisol with temperature and time are crucial in ensuring the product’s quality. With increasing temperature, the viscosity of