1·Methods for the modification of isocyanates include process of urethane, dimerization, trimerization, biuret, carbodiimide, and blocking reaction, etc.
异氰酸酯的改性方法包括氨酯改性、二聚改性、三聚改性、缩二脲改性、碳化二亚胺改性和封闭改性等。
1·Its ninhydrin reaction was negative, but after acid hydrolysis, its ninhydrin reaction and biuret reaction were positive.