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Thickening Effect of Commercial Associative Thickeners on the Latices of Copolymers of Acrylic Monomers Carrying Hydrophilic Reactive Groups
Authors: Quadrat Otakar | Horský Jiří | Šňupárek Jaromír
Year: 2003
Type of publication: článek v odborném periodiku
Name of source: Journal of Dispersion Science and Technology
Publisher name: Marcel Dekker Inc
Place: USA
Page from-to: 179-184
Titles:
Language Name Abstract Keywords
cze Thickening Effect of Commercial Associative Thickeners on the Latices of Copolymers of Acrylic Monomers Carrying Hydrophilic Reactive Groups Investigation of flow properties of butyl acrylate/styrene/2-hydroxyethyl methacrylate/acrylic acid laties thickened by commercial associative thickeners based on hydrophobic ethoxylated urethane (HEUR) or hydrophobically modified alkali-soluble emulsion (HASE) showed that the apparent viscosity, at a constant medium shear rate, increased with the increasing content of 2-hydroxyethyl methacrylate (HEMA). In contrast, the relative change in latex viscosity after the thickener addition (thickening efficiency), expressed as the ratio of viscosities of the thickened and untreated latices, decreased. This indicates that the increase in viscosity of the thickened latex with a higher HEMA content is caused by the increasing viscosity of the untreated latices due to rising hydrodynamic volume of alkalinized latex particles and not by higher particle bridging with the thickener macromolecules. The HEMA monomer clearly increases hydrohilicity of the particle surface which reduces adsorption of hydrophobic ends of the thickener on latex particles and the thickening efficiency decreases.
eng Thickening Effect of Commercial Associative Thickeners on the Latices of Copolymers of Acrylic Monomers Carrying Hydrophilic Reactive Groups Investigation of flow properties of butyl acrylate/styrene/2-hydroxyethyl methacrylate/acrylic acid laties thickened by commercial associative thickeners based on hydrophobic ethoxylated urethane (HEUR) or hydrophobically modified alkali-soluble emulsion (HASE) showed that the apparent viscosity, at a constant medium shear rate, increased with the increasing content of 2-hydroxyethyl methacrylate (HEMA). In contrast, the relative change in latex viscosity after the thickener addition (thickening efficiency), expressed as the ratio of viscosities of the thickened and untreated latices, decreased. This indicates that the increase in viscosity of the thickened latex with a higher HEMA content is caused by the increasing viscosity of the untreated latices due to rising hydrodynamic volume of alkalinized latex particles and not by higher particle bridging with the thickener macromolecules. The HEMA monomer clearly increases hydrohilicity of the particle surface which reduces adsorption of hydrophobic ends of the thickener on latex particles and the thickening efficiency decreases. latices of acrylic copolymers containing 2-hydroxyethyl methacrylate groups;associative thickeners;thickening efficiency

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