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酞酰化明胶(简称PA胶)作为中、低感乳剂的沉降剂,已经得到了广泛的应用。这个沉降剂有许多优点。它的主要缺点就是等电点太低,不适用于氨法高惑乳剂。寻求新型的适用于高感乳剂制备的沉降剂时,一个重要的技术指标就是要提高沉降剂的沉降pH值。当酞酸酐与明胶反应时,消耗了胺基,同时又引入了另外一个羧基。这两个因素加合的结果,使得PA改性明胶的等电点降得比较低。为了制备适用于高感乳剂制备的
Phthalated gelatin (referred to as PA plastic) as a low-flu, emulsion agents, has been widely used. This settling agent has many advantages. Its main disadvantage is that the isoelectric point is too low, not suitable for high ammonia law Emulsion. When looking for a new type of settling agent suitable for the preparation of highly sensitive emulsions, an important technical indicator is to increase the sedimentation pH of the settling agent. When phthalic anhydride is reacted with gelatin, the amine group is consumed while another carboxyl group is introduced. Addition of these two factors as a result, making PA modified gelatin lower isoelectric point. In order to prepare for the preparation of highly sensitive emulsion