4.7 Article

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

Journal

PROGRESS IN ORGANIC COATINGS
Volume 164, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2022.106725

Keywords

Polyurethane thickener; Silicon modification; Apparent viscosity; Rheology; Organic solvent resistance

Funding

  1. National Natural Science Foundation of China [21878109]
  2. Natural Science Foundation of Guangdong Province, China [2020A1515010177]
  3. Science and Technology Program of Guangdong Province, China [2020B1212070027]

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Hydrophobically modified ethoxylated urethanes (HEUR) are commonly used in paint fabrication to adjust rheology, prevent cracks, and improve resistance to sag. In this study, silicon modified HEUR was prepared using one-step polymerization, which exhibited good solvent stability and anti-organic-solvent performance.
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.

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