Influence of the composition of macromolecular diols on the rheology and water absorption of polyurethane acrylate emulsions

Abstract

Waterborne modified polyurethane (PU) dispersions with different macromolecular diols as soft segments were prepared by the self-emulsifying method, and then compounded with the acrylate monomers, the polyurethaneacrylate composite emulsion (PUA) with the core-shell structure was prepared by emulsifier free emulsion polymerization. The effects of the type and ratio of macromolecular diols in the soft segment on the particle size and distribution, rheological properties, adhesion, water absorption and thermal properties of the PUA emulsion were studied. The results showed that the particle size of PUA decreased, and the shear resistance and heat resistance of PUA were enhanced with the addition of polypropylene glycol.According to the water absorption rate of PUA emulsion, it was found that adding poly-1,4-butanediol adipate glycol and poly(caprolactone) diol with more hydrophobic groups could improve the water resistance of PUA dry film, and the minimum water absorption value was 0.68%.

Preparation and properties of cationic waterborne polyurethane/acrylate for fluorine‐free water repellents

“…However, the disadvantage of PA such as heat‐adhesive and cold‐brittleness makes it difficult to achieve ideal results in a variety of application fields. Polymerization of waterborne polyurethane/acrylate (WPUA) monomers with chemical bonds provides a promising solution to overcome the limitations of these shortcomings in its application 20–25 . In our previous work, anionic WPUA was synthesized using 2,2‐bis(hydroxymethyl) butyric acid as a chain extender to prepare fluoride‐free and durable water‐repellent agents for cotton fabrics 26,27 .…”

“…Polymerization of waterborne polyurethane/acrylate (WPUA) monomers with chemical bonds provides a promising solution to overcome the limitations of these shortcomings in its application. [20][21][22][23][24][25] In our previous work, anionic WPUA was synthesized using 2,2-bis(hydroxymethyl) butyric acid as a chain extender to prepare fluoride-free and durable water-repellent agents for cotton fabrics. 26,27 After being treated with the anionic WPUA, the contact angles of the cotton fabrics could reach more than 140 .…”