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Published
: 2022-09-01
Polyurethane ionomers. Part I. Preparation, structure, properties and application of anionic polyurethane or polyurethane-acrylic dispersions
Abstract
Several polyurethane anionomers have been synthesized (Table 1) in the reactions of toluilene (TDI) or isophorone diisocyanatcs, polyester or polyether polyols and dihydroxyacids. Urethane - isocyanate prepolymers have been extended with 1,6-hexamethyldiamine or terminated with 2-hydroxyethyl acrylate. They were eventually then copolymerized, in emulsion, with other acrylic monomers in the presence of free radical initiators (Table 2 and 3). 1H NMR or IR spectra confirm the expected structures of PUR anionomers and introduction of polar ionic groups (Figs. 1-3). GPC investigations showed that besides oligourethane anionomers also the components showing much higher molecular weights were present (Figs. 4 and 5) what influenced the viscosity or surface tension of aqueous dispersions prepared. The following properties of the products obtained in a form of coatings were investigated: dry substance content, hardness after seasoning, abrasion, flexibility, impact strength and gloss (Figs. 6-10). The investigations done allowed to choose the dispersion based on TDI and oligo(oxylenecaprolactone)diol as the best one to produce the varnish coatings.
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Król, P., & Król, B. (2022). Polyurethane ionomers. Part I. Preparation, structure, properties and application of anionic polyurethane or polyurethane-acrylic dispersions. Polimery, 49(7-8), 530–540. Retrieved from https://ichp.vot.pl/index.php/p/article/view/1781
