Novel urethane/acrylic hybrid emulsions for VOC compliant coatings

Abstract

PurposeThe purpose of this paper is to develop a volatile organic component‐free water‐based binder with improved coating properties from urethane‐alkyd acrylate by emulsion polymerisation.Design/methodology/approachAlkyd resin based on interesterification of sardine fish and linseed oil (50:50 w/w) was synthesised and reacted with isophorone diisocyanate to form urethane alkyd. The resultant urethane alkyd and acrylic monomers in different ratios were polymerised by emulsion polymerisation to form air‐drying water‐based binders and studied for physicochemical and other coating properties.FindingsUrethane alkyd, co‐polymerised with acrylates by emulsion polymerisation process, can be used to prepare water‐based air‐drying binders with excellent coating and application performance. The increase in acrylate component in the system resulted in improvement of performance properties.Research limitations/implicationsIn the present study, refined fish oil (FO) was obtained from sardine fish. Different FOs can be used to produce alkyd resin. Urethane alkyd and acrylic monomers in different ratios can be polymerised by emulsion polymerisation techniques.Practical implicationsThe emulsion polymerisation is the most effective technique used to produce water‐based binders with excellent coating properties.Originality/valueWater‐based binders can be widely used in exterior coatings and waterproofing of cement and roofs.

Preparation and properties of reactive polyurethane polyacrylate blends based on carbonyl‐hydrazide reaction

“…However, relatively high cost compared with polyacrylate latex limit its application in some cases. Typically, physical blends of two polymer systems are used to combine their potential cost reduction and tunable properties . However, in many cases, simple physical blending of polyurethane dispersion and polyacrylate latex cannot achieve excellent properties as expected due to the poor compatibility between two polymer systems …”

Incorporation of Modified Nano Montmorillonite (MMT) in Polyurethane Coatings Based on Acrylic Copolymer and Trimer of Isophorone Diisocyanate

“…Kabra et al (2012) studied effects of variable nano-silica loadings on the formulation of two component polyurethane coatings based on acrylic polyols [7]. Hybrid urethane-acrylic for PU coatings was studied by Athawale [8] while effect of microstructure of fluorinated acrylic coatings on UV degradation studied by Sung et al (2004) [9]. In our earlier report we have prepared isophorone diisocyanate (IPDI) to be used in acrylic based polyurethane coatings [10].…”