Abstract

Owing to a decrease in mineral oil resources, it is crucial to develop packaging materials based on renewable resources. Hence, a water vapor-barrier coating is developed as a natural wax-based dispersion. This dispersion should be stable over the storage time. In this study, the physical stability of a wax-based melt dispersion was analyzed (24 h and 21 days after production), and instability phenomena such as agglomeration, coalescence, and flotation were identified. Furthermore, the inter-correlations among the particle size, viscosity of the continuous phase, physical stability, surfactant chemistry, and hydrophilic–lipophilic balance value were characterized. Particle sizes were described by volume/surface mean d3,2, volume moment mean d4,3, and number mean d1,0 diameter, as well as the span of the volume and number distribution. Stability was characterized by the flotation rate, emulsion stability index, and Turbiscan stability index. Coalescence and agglomeration were not observed after the solidification of the wax particles. A significant correlation was observed for the emulsion stability index, with d3,2, and for flotation rate, with d1,0, d4,3, and viscosity as well, with d1,0, d3,2. Surfactants with hydrophilic–lipophilic balance values of 11–13.5 seem to be the most suitable for stabilizing candelilla wax-in-water suspensions. Particles were smaller, and wax suspensions were better stabilized using Tween 20 and Span 20, compared with Tween 80 and Span 80.

Highlights

  • Melt emulsification is a well-known process for producing suspensions, wherein the solid phase is melted and emulsified as a dispersion of droplets in the continuous phase

  • The correlations among the phase separation, particle size, and viscosity were examined for an immense statistical population, including dispersions produced by using hydrophilic–lipophilic balance (HLB) values of between 9 and

  • Changes in the size can be detected on basis of the back-scattering signal in the middle zone of the vial the particle size can be detected on basis of the back-scattering signal in the middle zone of the vialIf[87]

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Summary

Introduction

Melt emulsification is a well-known process for producing suspensions, wherein the solid phase is melted and emulsified as a dispersion of droplets in the continuous phase. The droplets solidify as spheres, and the hot emulsion changes into a suspension with a solid dispersed phase [1]. This method is predominantly used for lipid dispersed phases, and has the advantage of not requiring organic solvents [2]. This study is motivated by the development of a natural wax-based dispersion coating for packaging materials. The need for bio-based and biodegradable packaging materials has increased

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