Лако-красочные материалы — производство

A mixture of 50 grams of well dried О acid and 100 grams of technical sodium hydroxide is ground in a ball mill for 24 hours. The mixture is then placed in a vacuum baking apparatus (Fig. 30, page 181) which is evacuated and heated, as uniformly as possible by means of an oil
bath, to 205°C. during the course of 2 or 3 hours. This temperature is maintained for 24 hours, after which the product is removed. It is uniformly yellow in color and weighs about 135 grams.