A cationic protein filling agent has been prepared from collagen hydrolysate by amidation with ethanolamine and amination with diethanolamine-formaldehyde condensate.

• 采用乙醇胺对胶原水解物酰胺化,采用二乙醇胺与甲醛的缩合物胺化,制得了阳离子蛋白填充剂。