Effect of modified galactomannan on acrylic film properties

Abstract

Purpose

The purpose of this paper is to study the effect of acrylated guar gum (GG) compared with GG in acrylic emulsions with reference to its viscosity, film properties such as mechanical strength, weathering properties and clarity.

Design/methodology/approach

The acrylate derivatives were synthesised and characterised and then incorporated in acrylic emulsions and their rheology studied. Films were analysed for their clarity and mechanical properties. The films were then subjected to UV radiation and the influence of these additives on the weathering properties was studied.

Findings

The viscosity of acrylated GGs in emulsions was lower than that of GG in emulsion because of the increased hydrophobic nature and hence reduced water‐binding capacity. The mechanical properties of acrylated GGs were superior compared with GG due to increased compatibility of the additive with the polymer binder. This was further confirmed with increased clarity of the films. Acrylated GG was found to act as a protective additive with reference to UV degradation of the coatings.

Research limitations/implications

The performance of these additives was analysed on un‐pigmented coating formulations, which may not conform with pigmented coatings.

Practical implications

These biodegradable additives synthesised from renewable resources could be used to increase the mechanical strength as UV stabilisers and in some cases also as rheology modifiers.

Originality/value

The use of acrylated polysaccharides to increase mechanical and weathering properties allows the use of biodegradable, renewable resources as opposed to petroleum‐based compounds.

Citation

Shenoy, M.A. and D'Melo, D.J. (2008), "Effect of modified galactomannan on acrylic film properties", Pigment & Resin Technology, Vol. 37 No. 5, pp. 284-290. https://doi.org/10.1108/03699420810901954