Лако-красочные материалы — производство

Hydrophobically modified ethoxylated urethane thickeners, also known as polyurethane thickeners, are a more recent type of asso­ciative thickeners that are more popular for premium quality paints with low pigment volume concentration, which require excellent flow and leveling, and better spatter resistance and coverage. Alkyd-like rheology, hydrophobic properties, and enzyme resistance are some of the other merits of these thickeners. They are composed of hydro­philic polymers such as polyethylene glycol connected through ure­thane linkages and terminal hydrophobic groups such as oleyl, stearyl, dodecylphenyl, and nonylphenyl. The composition of the hydrophobic segment is very important for the rheological characte­ristics because the associative characteristics are derived from the adsorption behavior of these groups. Linear or comb-like structures are more common for polyurethane thickeners. Sag resistance and compatibility with glycol-containing pigment concentrates are the main limitations of hydrophobically modified ethoxylated urethane thickeners.