摘要
用激光粒度Zeta电位仪能较好地测定明胶胶粒的等电点,及明胶胶粒与铬配合物的作用,研究表明:温度的升高,明胶胶粒表面的负电荷增多,表面的COO^-量增加,从而促进铬鞣剂络合物与皮胶原蛋白的结合;明胶胶粒与硫酸铬作用使明胶表面电荷均为正值,作用时间越长,Zeta电位增加越快,说明硫酸铬主要是阳铬配合物;不浸酸铬鞣剂与明胶胶粒作用时,明胶胶粒的Zeta电位由负向正转变,说明不浸酸铬鞣剂在反应初期是一个较好的阴铬配合物,在与明胶结合的过程中,使明胶胶粒表面的电荷逐渐发生变化。这对于研究不浸酸鞣制机理有重要指导意义。
The Zeta potential of gelatin at different pH and temperature was investigated by Laser Sizer. Results show that the higher the pH value of gelatin solution, the lower its Zeta potential, and that the change of temperature may influence the dissociation and conformation of gelatin because the Zeta potential is much more negative in higher temperature. The variation of Zeta potential of gelatin reacting with chrome sulfate and chrome tanning agent respectively at different conditions were studied. Results indicate that the Zeta potential is positive at the beginning and increases gradually when gelatin reacts with chrome sulfate. However, when gelatin reacts with the chrome tanning agent, that is electronegative at beginning of reaction, its Zeta potential changes from negative value into positive and increases gradually. It is of great importance to study mechanism of chrome tanning .
出处
《中国皮革》
CAS
北大核心
2007年第21期34-37,共4页
China Leather
基金
国家自然科学基金项目(批准号20476064)
关键词
不浸酸铬鞣
鞣制机理
硫酸铬
模拟
Zeta电位
明胶
no - pickling chrome tanning
tanning mechanism
chrome sulfate
imitation
Zeta potential
gelatin