Abstract:

In order to improve the anti-pilling performance of knitted cashmere fabric, modified waterborne polyurethane (WPU) finishing agent was pre pared by using polytetrahydrofuran ether glycol as soft segment, dimethylolpropionic acid  as hydrophilic chain extender, and isophorone diisocyanate as hard segment and linear polyether-blocked amino silicone (LEPS) as modifier. The structure and properties of modified WPU were characterized by means of Fourier transform infrared spectrometry, dynamic thermo mechanical analyzer, rolling box type pilling tester and so on.  The results show that the modification by LEPS could obviously improves the flexibility of WPU film. The pilling grades of LEPS modified WPU finished knitted cashmere fabric is improved from 2-3 to 4 with soft touch. The color and color fastness to rubbing of the finished fabric are almost equal to those of the untreated fabric, static decay time of the finished fabric is reduced from 8.7 s to 2.7 s, and the durability of the finished effect is good.

Key words: linear polyether-blocked amino silicone, waterborne polyurethane, knitted cashmere fabric, anti-pilling