Original Research

The production of hydrotalcite from magnesite ore as non-toxic heat stabiliser for polyvinyl chloride

J. van der Laan, O. C. Vorster
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 24, No 1/2 | a165 | DOI: https://doi.org/10.4102/satnt.v24i1/2.165 | © 2005 J. van der Laan, O. C. Vorster | This work is licensed under CC Attribution 4.0
Submitted: 22 September 2005 | Published: 22 September 2005

About the author(s)

J. van der Laan, Departement Polimeertegnologie, Tshwane Universiteit van Tegnologie, South Africa
O. C. Vorster, Departement Polimeertegnologie, Tshwane Universiteit van Tegnologie, South Africa

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Abstract

In recent years polyvinyl chloride (PVC) processors had to submit to worldwide pressure to convert to environmentally friendly stabilisers such as hydrotalcite (HT), since most of the heat stabilisers currently in use contain heavy metals such as lead, cadmium or barium – these being highly toxic. The presently used HT production process is, however, very expensive as it involves the recovering of magnesium from seawater magnesia. The purpose of this study was to prove that it is indeed possible to produce cost effective and non-toxic HT from an alternative source. During this study the costing and heat stabilising ability of the hydrotalcite produced from magnesite was compared to that of commercially available heat stabilisers. The effect of the pre-mixing process, as well as the influence of particle size distribution was also investigated. A cost comparative and stabilising efficiency study indicated the cost effectiveness of HT produced from magnesite ore, in comparison with other commercially available stabilisers. The use of HT as produced from magnesite ore would indeed assist in the worldwide changeover to environmentally friendly stabilisers.


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