A new amphoteric amino-resin retanning agent suitable for leather retanning was synthesized using choroactic acid, aniline, urea, dicyandiamide, melanine and formaldehyde as the raw materials.

• 以一氯乙酸、苯胺、尿素、双氰胺、三聚氰胺和甲醛为原料合成了适用于皮革复鞣的新型两性氨基树脂复鞣剂。