Лако-красочные материалы — производство

In British gums, the repolymerization reaction is allowed to proceed to the greatest extent. Dry roasting is carried out for 10-24 h at temperatures between 150 and 180°C, and a very small amount of acid catalyst is used. These dextrins tend to be the darkest in color, which ranges from yellow to dark brown. As with the white dextrins, the British gums exhibit a wide range of solubilities in water depending on the exact reaction conditions used. However, the British gums are not prone to retrogradation, and they tend to give a more viscous suspension at the same concentration.