The usage of linseed oil-based polyurethanes as a rheological modifier

Orçun Yilmaz, Murat Baranak, F. Seniha Güner*, A. Tuncer Erciyes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Some oil-based urethanes (urethane oils) were prepared from linseed oil, glycerol, and two types of diisocyanates, hexamethyle diisocyanate (HMDI) and 4,4′-diphenylmethane diisocyanate (MDI). These urethane oils were used as a rheological modifier in solvent-based coatings. For this purpose the mixture prepared from urethane oil and alkyd resin (AR-UO) was investigated in view of flow properties. Time dependence of AR-UO was investigated by using the hysteresis loop method. None of the samples showed thixotropic flow behavior. The flow type was decided after calculation of the ratio of viscosity at low shear rate to viscosity at high shear rate. The results showed that HMDI-based samples had the smallest viscosity ratio and increasing the amount of aromatic structure caused increasing shear thinning behavior.

Original languageEnglish
Pages (from-to)1032-1035
Number of pages4
JournalJournal of Applied Polymer Science
Volume98
Issue number3
DOIs
Publication statusPublished - 5 Nov 2005

Keywords

  • Coatings
  • Polyurethanes
  • Renewable sources
  • Rheology
  • Viscosity

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