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Rotational Moulding of PVC Plastisol

Modelling of Initial Stages of Gelation
  • A. Marcilla , J. C. García , R. Ruiz , S. Sánchez , C. Vargas , L. Pita and M. I. Beltrán
Published/Copyright: April 30, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 20 Issue 1

Abstract

The viscosity during the earlier stages of the gelation process of plastisols formulated with 15 different commercial plasticizers has been obtained. Plastisols prepared were rotomoulded and mouldings obtained were characterized according to their wall thickness distribution. This parameter strongly depends on the minimum viscosity and on the rate of viscosity change during gelation (slope of the curves during the viscosity increase), and also on the temperature where no more flow of the plastisol is observed (gelation temperature). These variables are conditioned by the characteristics of the plasticizer and PVC employed, among other variables.

The effect of plate and arm velocity and rotation rate on the wall thickness distribution was also studied.

A simple model has been proposed to correlate the initial stage of the gelation of PVC plastisols formulated with the phthalate plasticizers. The suggested model assumes that the plastisol is a suspension constituted by a continuous phase (initially pure plasticizer) and a discontinuous phase constituted by PVC particles. It has been considered that the viscosity of the plastisol is influenced by the average mass molecular weight of the continuous phase and the temperature. The quantity of PVC dissolved in the continuous phase has been calculated by using a generic n-order kinetic equation for PVC dissolution rate. Additionally, a swelling process of the PVC particle by the plasticizer has also been considered and its effect on the viscosity of the suspension has also been accounted for. The model proposed provides a very good fitting of the sharp viscosity increase observed and is useful to predict the evolution of the viscosity of the parts in a rotomoulding process.

∗ Mail address: A. Marcilla, Chem. Eng. Dept., University of Alicante 03080 Alicante, Spain E-mail:

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Received: 2004-8-3
Accepted: 2005-1-24
Published Online: 2013-04-30
Published in Print: 2005-03-01

© 2005, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. New at International Polymer Processing
  5. Regular Contributed Articles
  6. Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
  7. Non-linear Viscoelastic Behavior of PVC Plastisol
  8. Algorithms for Two Gate Optimization in Injection Molding
  9. Viscoelastic Properties of Flexible Organic Fiber Composites
  10. Mold for Manipulation Microstructure Development
  11. Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
  12. Rotational Moulding of PVC Plastisol
  13. Drawability of As-spun PP Fibres
  14. Melt Fracture of Linear PE
  15. Investigation of the Cooling Jets Used in the Blown Film Process
  16. Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
  17. Design Sensitivity Analysis for the Optimization of the Injection Molding Process
  18. Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
  19. Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.1869

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. New at International Polymer Processing
  5. Regular Contributed Articles
  6. Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
  7. Non-linear Viscoelastic Behavior of PVC Plastisol
  8. Algorithms for Two Gate Optimization in Injection Molding
  9. Viscoelastic Properties of Flexible Organic Fiber Composites
  10. Mold for Manipulation Microstructure Development
  11. Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
  12. Rotational Moulding of PVC Plastisol
  13. Drawability of As-spun PP Fibres
  14. Melt Fracture of Linear PE
  15. Investigation of the Cooling Jets Used in the Blown Film Process
  16. Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
  17. Design Sensitivity Analysis for the Optimization of the Injection Molding Process
  18. Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
  19. Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
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