Preparation of silicon modified HEUR thickener with good rheological and solvent resistance properties

Hydrophobically modified ethoxylated urethanes (HEUR) has often been used in paint fabrication to adjust rheology, prevent cracks, and improve resistance to sag. However, in water-based coatings, organic solvents are often used as film-forming aids and co-solvents. These solvents will greatly weaken the thickening performance of HEURs. Herein, we adopt one-step polymerization to prepare silicon modified HEUR with good solvent stability and anti-organic-solvent performance. FTIR spectroscopy and H-NMR were used to evaluate the chemical structure of HEUR. Aggregation behavior, rheological behavior, thickening performance and anti-solvent performance were conducted to assess the performance of HUER. It was found that HEUR modified with 1,3-bis(3-aminopropyl) tetramethyldisiloxane displays an excellent behavior to resist organic solvents.