Effects of some phosphates on starch size for warp sizing were studied, and following results were obtained:
(1) Addition of small amount of Na
4P
2O
7 and Na
6P
4O
13 to starch size improves the sizing of spun yarns, and these effects are supposed to be common to polyphosphates.
(2) Viscosity of starch size drops sharply and becomes more stable by addition of these phosphates. It may be explained by dispersion of starch micelles and promotion of homogeneous dispersion of starch particles caused by electric repulsion of the phosphates which combine to starch particles by the secondary force.
(3) The improvements of sizing effects were also confirmed by investigations of adhesive power and some physical properties of films prepared from starch size, besides by increasing the breaking strength and resistance for abrasion of sized yarn.
(4) By addition of these phosphates, starch size easily produces clear and flexible film, and it shows improvement in sizing effects, It is supposed that this modification is due to homogeneous orientation of starch molecules and construction of their network bridge by the phosphate molecules.
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