Hybrid waterborne polyurethane/acrylate dispersion synthesized with bisphenol A-glicidylmethacrylate (Bis-GMA) grafting agent

• Published in: Progress in organic coatings Vol. 118; pp. 30 - 39
• Main Authors: Alvarez, Gustavo A., Fuensanta, Mónica, Orozco, Víctor H., Giraldo, Luis F., Martín-Martínez, José Miguel
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.05.2018; Elsevier BV
• Subjects: Adhesive bonding; Ascorbic acid; Bisphenol A glycidyl methacrylate; Bisphenol-A-glycidyl methacrylate (Bis-GMA); Butanediol; Charged particles; Chemical bonds; Chemical synthesis; Coatings; Dispersions; Ethylenediamine; Grafting; Hydrogen peroxide; Organic chemistry; Particle size; Polyurethane; Polyurethane resins; Polyurethane-acrylate; Stainless steel; Thermal stability; Waterborne dispersions; Waterborne dispersions; Polyurethane-acrylate; Bisphenol-A-glycidyl methacrylate (Bis-GMA); Coatings
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2018.01.016

[Display omitted] •New hybrid waterborne polyurethane dispersions were synthesized by using Bis-GMA.•Bis-GMA was first time reported as both chain extender and grafting agent.•Colloidal stable dispersions were obtain by using the self-emulsifying method.•The mean particles size is reduced when Bis-GMA is used instead of HEMA.•The Bis-GMA improve the thermal and adhesive properties of the dispersions. New hybrid waterborne polyurethane/acrylate (WPUA) dispersions were synthesized by grafting with bisphenol-A-glycidyl dimethacrylate (Bis-GMA) in order to create chemical bonds between polyurethane and polyacrylate chains. WPUAs were prepared by using prepolymer self-emulsifying method with isophorone diisocianate, poly(tetramethylene ether) glycol, dimethylolpropionic acid, and ethylenediamine in the polyurethanic part, and styrene and n-butyl acrylate in the polyacrylate portion. A redox pair system consisting of ascorbic acid and hydrogen peroxide were used as polymerization initiator. The particle size of the WPUA dispersions increased by increasing the Bis-GMA/1,4 butanediol ratio, stable dispersions of negatively charged particles were obtained, and they had low viscosity (around 1.3 mPa.s) in spite of the relatively high solids content (27 wt%). Higher thermal stability was obtained when 50 mol% of chain extension was carried out with Bis-GMA. Using Bis-GMA/BD, instead of HEMA, as grafting agent, allowed obtaining hybrid polyurethane dispersions with the lowest mean particle size and better colloidal stability. Finally, the addition of 35 wt% Bis-GMA increased noticeably the cross-cut adhesion of polyurethane/acrylate coatings to stainless steel.