Dextrin is an intermediate product of starch decomposition. Its chemical formula is the same as that of starch (C6H10O5)n, but the degree of polymerization is between soluble starch and maltose, and the iodine is red. The dextrin with low degree of polymerization does not develop color reaction. .
Dextrin is divided into two categories: yellow dextrin and white dextrin. The dextrin obtained by direct calcination is commonly called "British gum", and can also be called roast dextrin, which is brown. It is calcined with acid and can be decomposed at a lower temperature. The color of the product obtained is generally pale yellow or white, which is called white dextrin.
The main use of dextrin is as an adhesive. The warp sizing uses dextrin as a starch additive. The purpose is to reduce the viscosity of the starch and improve the permeability of the slurry. The starch slurry added with dextrin is easy to desizing, but the adhesion is poor, and the serosa is good. More brittle and hard. Often mixed with PVA for viscose fiber yarn and copper ammonia fiber filament sizing, it is not easy to fluff when dividing the yarn. After the synthetic slurries and modified starches are widely used, dextrin is rarely used in the formulation of warp sizing.
Dextrin is mainly used as an adhesive
