Preparation of core‐shell latex from co‐polymer of styrene‐butyl acrylate‐methyl methacrylate and their paint properties

Abstract

PurposeThe purpose of this paper is to study the effect of monomer composition in core‐shell latex prepared from co‐polymer of styrene‐butylacrylate (BA)‐methyl methacrylate (MMA) and their paint properties.Design/methodology/approachThe core‐shell latex was prepared by a stepwise semi‐batch emulsion polymerisation. A set of dispersion was made with the different core‐shell compositions. The core phase consists of a copolymer of styrene‐BA‐acrylic acid (AA) and the shell phase consists of a copolymer of MMA‐AA. The properties of latex were determined by solid content, viscosity, pH and particle size. Subsequently, emulsion paint (PVC‐37 per cent and NVM‐53 per cent) was prepared using core‐shell latex. The paint properties were determined by block resistance, gloss, elongation at break, etc. The particle morphology was characterised with transmission electron microscope (TEM).FindingsCore‐shell structure of latex was confirmed by TEM. The performance of core‐shell latex has been optimised and the best combination achieved with 25‐40 per cent of hard phase in core‐shell latex.Research limitations/implicationsAlthough the core‐shell structured latex was prepared from co‐polymer of styrene‐BA‐MMA monomer, the system could be extended with other monomers depending on the end use of surface coating.Practical implicationsThe paint industry may use this method to improve paint properties.Originality/valueThe paper shows that, by use of core‐shell latex, it is possible to achieve high‐block resistance, hardness, elasticity and gloss.

Emulsion terpolymerization of St/MMA/BuA: Modeling of composition, number of particles and the influence of n -DDM on the molecular weights

“…The model of the polymerization process proposed here is validated through the comparison of the experimental results with the simulations, as pointed out elsewhere (Mendoza et al, 2000) This work deals with the analysis of Mn and Mw of the terpolymer St/MMA/BuA in the presence of n-DDM as chain transfer agent because the study of the terpolymerization of the system St/MMA/BuA and their molecular weights is important in its application as an acrylic resin in industrial paints (Khan et al, 2009;Borthakur et al, 2010) or in nanocomposite coatings (Rong et al, 2011). The terpolymerization model was built up from the theoretical assumptions of the copolymerization of styrene/methyl methacrylate St/MMA system given by Nomura (Nomura and Fujita, 1985).…”

Soft core–hard shell latex particles for mechanically strong VOC‐free polymer films

“…In this case, unlike latex blends, a more homogeneous distribution of the two phases throughout the polymer film is acheived . One common approach is to use particles with a core–shell morphology consisting of a hard core, which reinforces the film, and a soft shell, which allows for film formation at acceptable temperatures . Such core–shell morphology is relatively easily synthesized by seeded emulsion polymerization, where the seed forms the core of the final particle .…”

Preparation of core–shell latex particles by emulsion co-polymerization of styrene and butyl acrylate, and evaluation of their pigment properties in emulsion paints

“…[1][2][3][4][5] Such kind of latex particles are usually prepared by a series of consecutive emulsion polymerization sequences with different monomer types, where the second stage monomer is polymerized in the presence of seed latex particles. 6,7 The resulting latexes are commonly known as ''core-shell'' latex, implying a particle structure with the initially polymerized polymers located at the center of the particle, and the laterformed polymers being incorporated into the outer shell layer. The synthesis of such multiple phase composite particles provides an opportunity to tailor properties for a range of desired applications such as paints, coatings, and additives.…”

“…Earlier, we reported the synthesis of core-shell particle of poly(n-butyl acrylate-co-methyl methacrylate-co-methacrylic acid) (PBA/MMA/MAA) as core and poly(styrene-co-acrylonitrile) (PS/AN) as shell by semi-continuous sequential emulsion polymerization and their application in decorative coating. 6,7 In this study, core-shell particles were prepared using copolymer of poly(butyl acrylate-co-methacrylic acid-co-ethylene glycol dimethacrylate) as the core and copolymer of poly(styrene-co-methyl methacrylate) as the shell by two-stage seeded emulsion polymerization. These core-shell particles were used as a pigment/ binder in emulsion satin paints, and the properties of the paint were evaluated.…”