Abstract:

Azobenzene-polyurethane based polymeric dye with anti-wrinkle property was prepared by covalently bonding N, N-di(2-hydroxyethyl) azobenzene with polyurethane chain in order to synchronously realize coloring and functional finishing and enhance the thermal migration. Results showed that reaction rate of the azobenzene and its content in polyurethane chain were 87.81% and 3.53%, respectively. The color remained unchanged after the azobenzene was introduced into the polyurethane. The coated cotton fabric with the azobenzene-polyurethane polymeric dye presented more vivid and richer shade than that with azobenzene physically mixed polyurethane, and the K/S value increased from 1.50 to 4.61. The fast and delayed elastic recovery angles of the coated fabric were improved from 110° to 183° and 136° to 227°, respectively. The thermal migration rate was dramatically reduced to 5%. Consequently, the azobenzene-polyurethane polymeric dye exhibited outstanding anti-wrinkle property and thermal migration property, which provided a novel route for shortening the textile technological process.

Key words: polymeric dye, polyurethane, azobenzene, anti-wrinkle property, thermal migration