Preparation of Overbased Liquid Micro Emulsion Stabilizers for Halogen Containing Polymers

Dr. Fakinlede Julius and *Isola Oladotun Bamiji

 

Poly (vinyl chloride) (PVC) is one of the most important commercial plastic materials, but it is thermally unstable at processing temperature. Processing of PVC at elevated temperatures requires the use of thermal stabilizers. This research work report the preparation, characterization and evaluation of metal carboxylates from fixed oils [locally available vegetable oils] that can function as PVC and or, other halogen containing polymers thermal stabilizers. A liquid micro emulsion stabilizer composition for stabilizing halogen-containing polymer consist of a micro emulsion of an overbased metal carbonate/carboxylate obtained from the reaction of an oxide and/or hydroxide of a metal selected from the group consisting of sodium, potassium, calcium, magnesium, zinc and mixtures thereof, an aliphatic carboxylic acid in which the aliphatic moiety contains up to about 30 carbon atoms and carbon dioxide in the presence of a solvent for the aliphatic carboxylic acid, a promoter and a micro emulsion-forming amount of surfactant.  Overbased micro emulsion stabilizers were prepared from four commercially available vegetable oils (Ground nut oil, Coconut oil, Soya oil and Palm Kernel oil).These oils were hydrolysed and the physico-chemical properties of the oils before and after hydrolyses were examined. Their micro emulsions were digested to determine the amount of metal concentration using Atomic Absorption Spectrophotometer (AAS).

 

Keywords: Overbased liquid micro emulsions, stabilizers, and halogen containing polymers. 

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