Abstract:

Abstract：Waterproof preparation was prepared for reducing the water-absorbing of starch grafted sodium acrylic when using.The starch grafted sodium acrylic microcapsule was prepared using waterproof materials including paraffin，beeswax and stearic acid via spray congealing technique .The microcapsule prepared is nearly globular, smooth and which particle size is under 120um. The properties of microcapsule including the characteristics of morphology, particle size distribution, wall/core ratio, feed ratio, water-absorptivity and the relationship were investigated in this study. The result shows that the effect of microencapsulation is best when the feed ratio is greater than 2:1. The effect of microencapsulation of beeswax, as one of three kinds of wall material ,is better than others. The diameter of stearic acid microcapsule wall is larger in size enough to encapsulate absorbent resin. The mortality of starch grafted sodium acrylic coated with beeswax to mice reach 70%.The beeswax was regarded best material to coat starch grafted sodium acrylic and good mice killing result was obtained.