Abstract: Effect of some amino substances used as plasticizers on the plasticization of starch sizing agents was investigated in terms of paste viscosity, viscosity stability, adhesion-to-fibers, and starch film behaviors. The plasticizers evaluated included aniline, ethanolamine, urea, etc. Superior plasticizer was found through control test, and the content was also determined. The experimental results demonstrated that the plasticizers could improve the fragility of starch film because breaking elongation and flex resistance of the film increased and wear loss decreased. However, tensile strength of the film decreased with the increase of plasticizer content. It was recommended that ethanolamine should be used for plasticizing starch with a content of 6%～9% based on dry weight of starch.

Key words: Starch, Warp sizing agent, Plasticizer, Starch film