羧基化改性水解胶原蛋白铬鞣助剂的制备及其性能

Preparation and properties of carboxylation modified hydrolyzed collagen chromium oxide promoter

采用从废弃皮胶原提取得到的蛋白粉,对其进行水解,控制不同水解时间分别为2h、4h、6h得到三种水解蛋白,再利用乙醛酸对其进行羧基化改性,制备成三种铬鞣助剂,依次命名为PGA-1、PGA-2、PGA-3.对其进行应用研究,采用SEM和ICP-OES,对其结构进行表征,再测定蓝湿皮的收缩温度以及废液中铬离子的含量.结果表明,当加入质量分数20%的PGA-2时,其蓝皮收缩温度为119.9℃,SEM显示胶原纤维分散均匀.当应用4.5%的铬粉时,其收缩温度比加入6.0%铬粉仅仅降低了1.4℃,但是废水中铬离子含量降低了35%,而且胶原纤维分散均匀,蓝皮中Cr2O3含量也相差不大.采用4.5%的铬粉.降低了铬粉用量,有利于清洁化生产.

In this paper,the protein powder extracted from the waste skin collagen was used to hydrolyze and control the three hydrolysis proteins with different hydrolysis time of 2 h,4 h and 6 h respectively,and then carboxylated with glyoxylic acid to prepare three kinds of chrome tanning aids,which were named PGA-1,PGA-2 and PGA-3 respectively.The application was studied,and the structure was characterized by SEM and ICP-OES.The shrinkage temperature of the wet blue skin and the content of chromium in the waste liquid were determined.The results showed that when add the mass fraction of 20% PGA-2,the blue leather shrinkage temperature is 119.9 ℃,SEM showed collagen fiber dispersed evenly.When 4.5% chromium powder is applied,the shrinkage temperature is only 1.4 ℃ lower than the addition of 6.0% chromium powder,but the chromium ion content in the wastewater is reduced by 35%,and the collagen fibers are evenly dispersed,and the Cr 2O 3 content in the blue skin is also similar.Reduce the amount of chromium powder,which is conducive to clean production.