Лако-красочные материалы — производство

Yellow dextrins are prepared at higher temperatures (135-160°C) and longer roasting times (8-14 h) in the presence of less acid catalyst than are the white dextrins. These conditions promote further repolymerization, yielding a yellow or tan powder with a degree of polymerization between 20 and 50. The yellow dextrins are, for the most part, water soluble; less than 1 part water to 1 part dextrin is required for a working suspension. Yellow dextrin suspensions exhibit good viscosity stability, so retrogradation is less of a problem.