Impact of Processing Conditions on Rheology, Tribology and Wet Lubrication Performance of a Novel Amino Lipid Hair Conditioner

Cosmetics Journal

The objective of this work was to carry out a comprehensive evaluation of the performance
of a novel cationic amino lipid surfactant, Brassicyl Valinate Esylate (BVE), in contrast to conventional
alkyl quaternary ammonium surfactants (quats), through a study of the effects of process mixing
speed on its overall rheological, tribological and wet lubrication performance in comparison to BTAC
and CTAC, two cationic surfactants widely used in cosmetics. The major cosmetic application of
cationic surfactants is in the preparation of hair conditioners. Hence, this analysis was done firstly
by conducting tensile combing tests to evaluate reduction in wet lubrication which translates to
conditioning performance. The combing results serve as a testing metric that adequately corresponds
to consumer perception of conditioned hair. To correlate this technically, yield stress measurements
were conducted to establish rheologic profiles of the conditioner formulations, and in vitro tribological testing of the emulsion systems between two steel surfaces were done to technically simulate
the spreading and rubbing of conditioner on the hair. The effect of processing conditions on the
formulations was then evaluated. BVE was found to be an effective conditioning surfactant suitable
as an eco-friendly replacement for BTAC and CTAC in hair conditioner formulations. The results
showed that higher shear mixing rates during formulation lead to poorer performance effects evident
through decreased yield stress values, lower percentage reduction in combing force and a higher
coefficient of friction. 

For details: 

Impact of Processing Conditions on Rheology, Tribology and Wet Lubrication Performance of a Novel Amino Lipid Hair Conditioner

Omolade Ajayi, Aina Davies and Samiul Amin

Chemical Engineering Department, Manhattan College, New York, NY 10471, USA

Cosmetics 2021, 8, 77.
https://doi.org/10.3390/cosmetics8030077

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5 October, 2021