Abstract:

As starches are usually insoluble in water of medium-low temperature and according to the requirements of medium-low temperature sizing in solubility, sizing viscosity, film-forming properties and adhesion properties to textile fibers involving sizes. In the way of modifying the raw starch by acid hydrolysis, quaternary ammonium cation and ethanol-alkali method, the medium-low-temperature water soluble Quaternary ammonium cationic starch suitable for medium-low-temperature sizing was prepared. The microstructure and properties of the starch were characterized by means of SEM, FTIR, Electrophoretic Analysis. We optimized the effects of reaction temperature, reaction time, dosage of ethanol, water content in on the solubility of the prepared starch in ethanol-alkali method, and the slurry and size film was studied. the mole ratio of starch, water, ethanol and base of 1: 20: 8: 0.4,  reaction temperature was 60℃ and  the reaction time duration for 50min, which are soluble in water at room temperature and have good viscosity and sediment stability.

Key words: quaternary ammonium cationic starch, water solubility in medium-low temperature, solubility degree, sedimentation volume, sizing peoperty, property of sizing menbrane