Development of water‐based polymeric dye and its application as a colorant for waterborne polyurethane

Abstract

In this project, an eco-friendly aqueous synthesis method of water-based polymeric dye (WPD) was developed and its potential as a colorant for waterborne polyurethane (WPU) was tested. The WPD was produced by reacting polyethylenimine with commercial reactive dye in the warm alkaline solution. The colored polyurethane membrane was then produced via solution blending of WPD and WPU, followed by air-drying. The results showed that WPD with a wide variety of colors can be easily synthesized by selecting different precursory reactive dyes and can be easily blended with WPU via moderate stirring. The colored PU membranes have good transparency and the logo under them can be clearly observed. Compared with the pure polyurethane membrane, the absorbance of colored polyurethane membrane at the wavelength of maximum absorption increases at least 20.2% even if the content of WPD within the colored polyurethane membrane is as low as 0.16%, implying that our WPD has excellent color strength. Finally, the colored polyurethane membranes have very high colorfastness to water and can be stored in deionized water for 2 weeks without dissolution of WPD. As a result, our developed WPD is a promising and cost-effective colorant for WPU. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44710.

Waterborne polyurethane‐based dye with covalently bonded to Disperse blue 60

“…Recently, water‐based polymer dyes have received extensive attention due to nontoxic and eco‐friendly properties . Waterborne polyurethane‐based dyes have received extensive attention in recent years due to their excellent thermal‐migration resistance, color fastness, nontoxic, and environmental‐friendly properties …”

Advances in Waterborne Polyurethane and Polyurethane-Urea Dispersions and Their Eco-friendly Derivatives: A Review

“…This fact implies constraints for some applications, and thus cationic dispersions are not so widespread compared to the industrial applications of anionic dispersions [ 18 , 23 ]. Among anionic emulsifiers, particularly DMPA [ 51 , 52 , 53 ], 2,2-bis(hydroxymethyl) butyric acid (DMBA) [ 54 , 55 ], and sulfonated agents [ 56 , 57 ] are commonly employed in the synthesis of WBPU and WBPUU [ 58 ]. Concerning cationic emulsifiers, N-methyldiethanolamine (MDEA) is the most used one [ 58 , 59 , 60 ].…”