A new blue chain extender

1-(1

1-bis(hydroxymethyl)) ethyl amino-4-methylamino anthraquinone (HMEMAQ) was synthesized using 1-methylamino-4-bromo-anthraquinone and 2-amino-2-methyl-1

3-propanediol as raw materials by substitution reaction

and then the polyurethane prepolymer was prepared using HMEMAQ and N

N-bis(2-hydroxyethyl) acrylamideas chain extenders.After that

the covalently blue polyurethane-acrylate copolymer (PUA) emulsion was fabricated through the copolymerization of polyurethane prepolymer with methyl methacrylate and butyl acrylate.The chemical structure of HMEMAQ and the properties of PUA emulsions and their latex films were characterized by 1H-NMR

FTIR

UV-Vis spectra

size and zeta potential analysis

xenon arc aging testing and so on.Results showed that

under nitrogen atmosphere

the color fading of emulsions could be avoided when AIBN was used as initiator during the fabrication of PUA emulsions.When the AIBN amount was equal to 2 wt% based on the unsaturated monomers

the conversion of unsaturated monomers reached 99.9%.The unsaturated monomer conversion and the colloidal properties had no obvious change with the increase of the HMEMAQ amount.The max value of the PUA film and HMEMAQ was the same at 640.8 nm

indicating the same color of them.Comparing with the non-covalently blue PUA film which had the same chromophore

the covalently blue PUA film exhibited obvious improvements both in light fastness and solvent fastness.