Dispersion stability of phosphate-silica based nano-sizing agent

To research the effect of stability of nano-sizing agent on starch paste,SiO_2/phosphate system nano-sizing agent was prepared with Na_3PO_4,Na_4P_2O_7,(NaPO_3)_6 and Na_5P_3O_(10) as dispersant respectively and characterized by using centrifugal transmissibility and sedimentation.The effect of its stability on the property of starch paste,film and adhesion was investigated.Experiments demonstrated that in terms of dispersing and stability,the phosphates exhibit an order as follows: Na_3PO_4Na_4P_2O_7(NaPO_3)_6Na_5P_3O_(10) and the best dispersability of the nano-sizing agent is obtained when the above phosphates′ mass fractions are 0.5%,4%,8% and 10% respectively.This nano-sizing agent has little influence on starch paste,but improves the film strength and adhesion,the improvement increases with the enhancement of the stability of the dispersion,in particular,with Na_5P_3O_(10).